Bugfix in outmdm (output buffer flush)

[kermit-80.git] / cpkerm.mss

@Part(CPKERM,root="kuser")
@string(-cpmversion="@q<4.11>")
@Chapter<CP/M-80 KERMIT>
@index<CP/M-80 Kermit>

@case(device,file="********@*
This document is formatted as an ordinary, plain text ASCII disk file.
Typeset copies are available in the Kermit User Guide from Columbia
University.  Changes should be made to CPKERM.MSS.@*********")

@Begin<Description,Leftmargin +12,Indent -12,spread 1>
@i(Program:)@\Mike Freeman, Bonneville Power Administration, Vancouver, WA,
USA, with contributions from many others.

@i(Language:)@\8080 Assembler, LASM, M80, or MAC80

@i(Version:)@\@value(-cpmversion)

@i(Date:)@\April 1, 1991

@i(Documentation:)@ @ Christine Gianone, Columbia University, with
contributions from many others.

@end<Description>
@label<-k80>

@i<KERMIT-80 Capabilities At A Glance:>
@begin<format,leftmargin +2>
@tabclear()@tabset(3.5inches,4.0inches)
Local operation:@\Yes
Remote operation:@\Partial, Auto-receive only
Login scipts:@\Yes, limited
Transfer text files:@\Yes
Transfer binary files:@\Yes
Wildcard send:@\Yes
File transfer interruption:@\Yes
Filename collision avoidance:@\Yes
Can time out:@\Yes
8th-bit prefixing:@\Yes
Repeat count prefixing:@\No
Alternate block checks:@\Yes
Terminal emulation:@\Yes, VT52 and others
Communication settings:@\Yes
Support for dial-out modems:@\No
Transmit BREAK:@\Yes; most versions
IBM communication:@\Yes
Transaction logging:@\No
Debug logging:@\No
Session logging:@\Yes
Raw file transmit:@\Yes
Act as server:@\No
Talk to server:@\Yes
Advanced commands for servers:@\Yes
Command/init files:@\Yes
Command macros:@\No
Local file management:@\Yes
Handle file attributes:@\No
Long packets:@\No
International Character Sets:@\No
Sliding Windows:@\No
Printer control:@\Yes, limited
@end<format>

@Section<Credits>

CP/M Kermit is the first of all the Kermit programs.  It was originally
written by Bill Catchings of Columbia University in 1981.  Over the years,
contributions have been added by many people, including
Charles Carvalho (ACC),
Bernie Eiben (DEC), Nick Bush (Stevens Institute of Technology),
John Bray (University of Tennessee), Bruce Tanner (Cerritos College),
Greg Small (University of California at Berkeley),
Kimmo Laaksonen (Helskini University of Technology),
Brian Robertson (Aberdeen University), A.J. Cole (Leeds University),
John Shearwood (Birmingham University),
Tony Addyman (Salford University), Godfrey Nix and Martin Carter
(Nottingham University), Ian Young (Edinburgh University), Chris Miles
(Manchester University), Richard Russell, Dave Roberts,
and many, many others.

Version 4.11 is the work of Mike Freeman of the Bonneville Power
Administration in Vancouver, WA, USA, with assistance from Russell Lang of
Monash University in Australia, Jay S Rouman of Mt Pleasant MI, and others.

@section<What's New>

Features added since version 4.09 include:
@begin<itemize>
SET COLLISION {BACKUP/DISCARD/OVERWRITE/RENAME}

SET INCOMPLETE-FILES {DISCARD/KEEP}

Many REMOTE commands, including some REMOTE SET commands

RENAME command to rename CP/M files from within Kermit-80

SET RECEIVE/SEND PACKET-LENGTH nn (nn <= 94)

SET AUTORECEIVE ON now implies that Kermit-80 ALWAYS tries to
receive more files when a RECEIVE transaction has completed.  The
user can cancel with ^C.

QUIT is now a synonym for EXIT.

STAY is now a synonym for SET NO-EXIT.

CONNECT, RECEIVE and SEND may be abbreviated to C, R and S,
respectively.

Cancellation of TAKE, TYPE, and PRINT commands from the keyboard.

Many bug fixes.

Kermit-80 Version 4.11 now supports the Microbee family of
computers (56K, 64K, 128K and 256K) manufactured by
Microbee Systems, Ltd, of Australia.

Kermit-80 now supports the Ampro Little Board system.
@end<itemize>

@section<Overview of Kermit Operation>

Use the SET command to establish necessary communication parameters like
SPEED and PARITY.  Use the CONNECT to establish a terminal connection to
the remote computer.  If you are dialing out with a modem, type the necessary
dialing commands to the modem first.  The dialing process can be automated
to some extent using a TAKE command file containing INPUT, OUTPUT, and PAUSE
commands.  Then log in to the remote computer or service and conduct a session.

To transfer a text file, start the Kermit program on the remote computer and
tell it to SEND the desired file (if uploading) or to RECEIVE (if
downloading).  "Escape back" to CP/M Kermit, usually by typing Ctrl-] (hold
down the Control key and press the right bracket key) and then type the letter
C.  At the CP/M Kermit prompt type RECEIVE (if you gave a SEND command to the
remote Kermit) or SEND @i<filename> (if you gave a receive command to the
remote Kermit).

To transfer a binary file, give the command SET FILE TYPE BINARY to the remote
Kermit and SET FILE-MODE BINARY to CP/M Kermit before issuing any SEND or
RECEIVE commands.

Multiple files of the same type (text or binary) can be transferred in a
single operation using "wildcard notation" (including special characters like
asterisk in the filename).

When file transfer is complete, CONNECT back to the remote computer,
use the EXIT command to exit from the remote Kermit program, finish your work
on the remote computer, log out from it, escape back to CP/M Kermit again,
and EXIT from CP/M Kermit.

The remote Kermit may also be put into "server mode" to simplify these
operations.  Give the SERVER command to the remote Kermit, escape back to CP/M
Kermit, and then issue SEND commands to send files (upload), GET @i<filename>
commands to receive (download) files, REMOTE commands to request various other
services (like directory listings) from the remote Kermit.  When you are done,
give a BYE command to terminate your remote session, or a FINISH command to
tell the remote Kermit to return to its prompt so you can CONNECT back and
conduct further business.

That's all there is to it.

@Section<Summary of CP/M>

There are essentially two versions of CP/M - Versions 2.2 
and 3.0 (sometimes also called CP/M PLUS.)  

CP/M-80 Version 2@q<.>2 is run in 
a single 64 Kbyte "page", usually the largest amount of memory on
Z80 or 8080 systems.  The BIOS (Basic input/output system),
BDOS (Basic Disk Operating System) and CCP (Command console processor)
all share memory with any transient program the user may wish to run.
Some basic commands are
available through the CCP, like DIR, ERA etc,while others are loaded 
from disk into the transient program area and run as a program,
like PIP or STAT.

CP/M Version 3@q<.>0 (or CP/M PLUS) effectively removes the requirement 
of having the CCP and BDOS along with a chunk of the BIOS code being
resident in the single 64k byte page of memory.  This allows even more
space for programs in the TPA, but still a little less than the maximum
of 64k.  It is substantially different from CP/M version 2@q<.>2, with
lots of added features.  Kermit-80 uses very few additional version
3@q<.>0 features, and only where absolutely necessary.

CP/M file specifications are of
the form @q(DEV:XXXXXXXX.YYY), where
@begin<description>
 @q(DEV:)@\is a @i<device name>,
normally the A:@ or B:@ floppy.  If omitted, the device name defaults
to your connected diskette.

@q(XXXXXXXX)@\is a @i<filename> of up to 8 characters.

@q(YYY)@\is the @i<file type>, up to 3 characters.
 @end<description>
 File names and file types may contain letters, digits, and some
special characters, including dash, dollar sign, and underscore, but
no imbedded spaces.  Upper and lower case letters are equivalent.

 "Wildcard" file-@|group specifications are permitted in file names
and file types (but not device names) within certain contexts; a "@q(*)"
matches a whole field, a "@q(?)"  matches a single character, including
space.  Examples: "@q(*.F??)" specifies all files whose @i<types> start
with F and are 1, 2, or 3 characters long; "@q(F?.*)" specifies all
files whose names start with F and are no more than two characters
long (before the trailing spaces).

The five CP/M commands are:
 @Begin<Description>
DIR @i<file>@\Lists the the names of the specified files.  The
default file specification is "*.*".  Example: @w<"@q(DIR B:*.FOR)">.

ERA @i<file>@\Erases (deletes) the specified file(s); wildcards allowed.

REN @i<new> @i<old>@\Changes the name of a file from @i<old> to 
@i<new>, e.g.@*
@w<"@q(REN NEW.FOR=OLD.FOR)">.

SAVE@\Saves the specified number of memory blocks into a file. 
(Not on CP/M Plus systems)

TYPE @i<file>@\Types the specified file on the screen, e.g.
@w<"@q(TYPE FOO.TXT)">.
 @End<Description>
The most important programs are:
 @Begin<Description>
STAT@\Gives statistics on disk usage; sets and displays IOBYTE.  
(Not on CP/M Plus systems)

PIP@\@u<P>eripheral @u<I>nterchange @u<P>rogram.  Copies files.  In
response to the "@q(*)" prompt, give a command of the form
 @example<disk:outfile=disk:infile>
 Wildcards ("@q(*)" for a whole field or "@q(?)"  for a letter) can be used.
Examples: "@q(A:=B:*.*)" to copy a whole disk, "@q(A:=B:*.FOR)" to copy all
the Fortran programs from disk B to disk A.  If the disk specification
is omitted, your "connected" disk is assumed.  Command line arguments
are also accepted, e.g. "@q(PIP A:=B:*.*)".

@End<Description>

There are equivalent commands for CP/M Version 3.0, but are not loaded into
memory in the same way as for CP/M Version 2.2.
For further information on CP/M, consult your microcomputer manual or
a CP/M handbook.

@Section<Kermit-80 Description>

Since Kermit-80 runs on a standalone micro, it is always in control of the
screen -- it is always in "@i<local>@index<Local> mode".  It includes a
terminal emulator for establishing a connection to a remote computer or
service, and during file transfer, it keeps the screen updated with the
file name and the packet number, whether sending or receiving.

@index<Timeout> Kermit-80 is capable of an imprecise or "fuzzy" timeout on an
input request, and can break deadlocks automatically.  In most cases, this is
not important, because the Kermit program on the other side is most likely
able to handle the timeouts.  The timeouts done by Kermit-80 are fuzzy because
they depend on the speed of the processor and other factors that can vary from
system to system.

If, despite the timeout capability, the transmission appears to be stuck (and
you can tell that this has happened if the screen fails to change for a while)
you can type carriage return to have the micro do what it would have done on a
@Index[Timeout] timeout, namely NAK@Index[NAK] the expected packet to
cause theforeign host to send it again (or, if the micro is sending, to 
retransmit the last packet).  Micro/@|micro or micro/@|IBM-@|mainframe 
transfers could require this kind of manual intervention.

File transfers may be interrupted in several ways.
@begin<description>
@Index[Control-C]
Control-C@\This will return you to Kermit-80 command level immediately, so that
you can connect back to the remote system, or take any other desired action.

@Index[Control-X]
Control-X@\When sending a file, this will terminate the sending of the current
file with a signal to the KERMIT on the other side to discard what it got so
far.  If there are more files to be sent, KERMIT-80 will go on to the next one.
When receiving a file, KERMIT-80 will send a signal to the remote KERMIT to
stop sending this file.  If the remote KERMIT understands this signal (not all
implementations of KERMIT do), it will comply, otherwise the file will keep
coming.  In any case, the remote KERMIT will go on to the next file in the
group, if any.

@Index[Control-Z]
Control-Z@\Like Control-X, except if a file group is being transmitted, this
will stop the transmission of the entire group.  If only a single file is being
transmitted, it works exactly like Control-X.

@Index[Carriage Return]
@Index[CR]
Carriage Return@\If you type a carriage return Kermit-80 will resend the
current packet.  You may do this repeatedly, up to the packet retry limit
(somewhere between 5 and 16 times) for a particular packet.
@end<description>

@heading<Kermit-80 Commands>

Kermit-80 is an interactive program.  It issues a prompt, you type a command.
The process repeats until you give the EXIT command to leave the program.

Commands consist of keywords, filenames, and numbers.  Keywords may be
abbreviated to minumum unique length.  "?" may be typed to request a menu of
the available options for the current field at any point in a command.  ESC
may be typed at any point in a command to fill out the current keyword or
filename; if sufficient characters have not been typed to identify the current
field uniquely, Kermit-80 will sound a beep and allow you to continue from
that point.  Here are Kermit-80's commands:
@begin<description,leftmargin +8,indent -8>
@Index[Break]
BREAK@\Send a BREAK condition to the remote computer.  This is only possible
if your system is capable of sending breaks.  It is intended to be used with
PAUSE, OUTPUT, etc and the TAKE command to do wierd and wonderful things, like
automatic logging on to a remote host.

@Index[Bye]
BYE@\When talking to a remote Kermit Server, this command shuts down
the server and logs it out, and also exits from Kermit-80 to CP/M command
level.

@Index[Virtual Terminal]@Index[Escape Character]@Index[Connect]
CONNECT@\Establish a terminal connection to the computer, service, or device
that is
connected to the serial port, i.e.@ pass all typein to the serial port and
display all input from the serial port on the screen.  Also, emulate a DEC VT52
to allow cursor control, screen clearing, etc., if VT52-EMULATION is ON (see
below), in which case you should also set your terminal type on the remote host
to VT52.  (Some versions emulate other terminals.)  The CONNECT command may
be abbreviated by the single letter C.

@\Warning: VT52 emulation is only successful if your system or its
attached terminal can do the same sort of functions as a genuine
VT52.  Things to beware of are cursor addressing, clear to end of page
and end of line, clear screen, home cursor, and clear-and-home
functions.  The useability of VT52 emulation depends entirely on
how many of the VT52 functions can be emulated by your micro or terminal.

@\The escape character differs from micro to micro; when you issue
the CONNECT command, the micro will print a message telling you how
to get back.  The escape sequence is generally an uncommonly-@|used
control character, like CTRL-backslash or CTRL-rightbracket, followed
by a single letter "command":
@begin<description,spread 0,leftmargin +4, indent -4>
C@\Close Connection, return to @q(Kermit-80>) command level.

S@\Display Status of connection, but maintain remote connection.

@q<?>@\List available single-character commands.

0@\(zero) Send a null (0) character.

B@\Send a BREAK signal.  Most systems provide this function.

D@\Drop the line.  Used on the Apple with modem.  Automatically
closes the connection after dropping the line.  The TORCH system 
acknowledges this command but does nothing.

P@\Toggle printer on or off.  Allows you to copy whatever goes 
to the screen to the printer.

S@\Temporarily suspend logging to the log file.

Q@\Restart logging to the log file

@q<^]>@\(or whatever - a second copy of the escape character) Send the
escape character itself to the remote host.
 @end<description>

@Index[Copy]
@Index[File Copying]
COPY @i<source> @i<destination>
@\Copy a named file to another file, either on the same drive or another
drive.

@Index[Directory]
DIRECTORY@\This provides a directory listing of the specified files.
If no files are
specified, all files on the default disk are listed.  File sizes, in K, are
included.  You may interrupt the listing at any time by typing any character.
The listing (even if interrupted) concludes with a display of the amount of
free storage left on the disk.  You can inhibit the display of file sizes by
SET DIRECTORY OFF.

@Index[Erase]
ERASE @i<filespec>@\This executes the CP/M ERA command on the specified 
file(s).  The names of the files being erased are not displayed.

@Index[Exit]
EXIT@\Quit back to CP/M.  The return is made by a JMP 0 (Warmstart).  QUIT
is a synonym for EXIT.

@Index[FINISH]FINISH@\Like LOGOUT, but shuts down the remote server without
logging it out.  Leaves you at Kermit-80 command level; subsequent CONNECT
commands will put you back at host system command level.

@Index[GET]GET @i<filespec> [@i<local_filespec>]
@\When Kermit-80 is talking to a Kermit Server on
the host, you should use the GET command to request the server to send
files to you, for example:
@example<get hlp:k*.hlp>
You may specify a local filename if you want to save the remote file
under a different filename.
Limitation: If you request an alternate block check type using the SET BLOCK
command, the GET command will not communicate it to the remote server.  If you
want to have type 2 or 3 block checks done when getting files from the server,
you have to issue the appropriate SET BLOCK command to the remote KERMIT before
putting it in server mode.

@Index[Help]HELP@\List all these commands, with a short description
on what the commands do.  A question mark will do the same.  If you have
already typed a command but do not know what the parameters are, type a
space (to indicate the end of the command) and a question mark.  You will
be informed of what Kermit can expect at that stage.

@Index[Input]INPUT @i<seconds> @i<text>@\Setup a text line and time delay
for your CP/M system to expect from the host, then wait up to the given number
of seconds (approximately) for text to be sent to your CP/M-80 system.

@Index[LOG]LOG @i<filespec>@\When CONNECTed to a foreign host as a terminal,
log the terminal session to the specified diskette file.  This functionality
depends to some extent on the remote host's ability to do
@Index[XON/XOFF]XON/XOFF flow control, and does not guarantee a complete
transcript (after all, that's what the KERMIT protocol is for).  The log file
is closed when the connection is closed by typing the escape character followed
by the single-@|character command "C".

@Index[Append]
@\It is possible to temporarily suspend logging during connect
state.  Typing an escape sequence can turn file logging on
(<escape-character> R for Resume) or off (<escape-character> Q for quiet).

@\Re-entering connect state will re-open the previously opened 
log file and append to that file.

@Index[LOGOUT]LOGOUT@\Like BYE, but leaves you at Kermit-80 command level.

@index<OUTPUT>OUTPUT @i<text>@\Send the text to the remote computer as if
you had typed it.

@Index[Pause]PAUSE @i<seconds>@\If this command is issued your CP/M
system will wait a while before proceeding with another command.
This is intended for use in TAKE commands, where you may want to pause
for a while before proceeding with the rest of the TAKE file.  The
actual delay is very variable between systems, and values should
be determined on a trial and error basis.

@Index[Print]PRINT@\Print a file to the console and printer.  Output to
the printer is buffered by the Kermit-maintained printer buffer.
This routine is identical to TYPE but characters are echoed to the printer
as well as to the screen.  Suspending and canceling output is as
described in TYPE.

QUIT@\Synonym for EXIT.

@Index[RECEIVE]@Index[File-Warning]
RECEIVE @i<filespec>@\Receive file(s) from the remote
Kermit, and save them under the names provided in the file headers
supplied by the remote host.  If a local filespec is given, the file is
saved under the given filename.  If the names aren't legal, use as 
many legal characters from
the name as possible (see the description of SET FILE-WARNING below).  If
there's a conflict, and FILE-WARNING is ON, warn the user and try to build a
unique name for the file by adding "@q<&>" characters to the name.  RECEIVE
can be abbreviated to the single letter R.

@index<REMOTE>REMOTE @i<command>@\Send a command to a remote Kermit server.
The results are sent back to your CP/M screen.  When two arguments are
required and specify less than two in the command, you will be prompted for
the missing arguments.  REMOTE commands include:
@begin<description,leftmargin +4, indent -4>
REMOTE CD [directory]@\Ask the remote server to change its default directory.
If no directory is specified, the server changes to its login directory.

REMOTE COPY file1 file2@\Ask the remote server to copy file1 to file2.

REMOTE RENAME file1 file2@\Ask the remote server to rename file1 to file2.

REMOTE DELETE filespec@\Ask the remote server to delete the named file or
files.

REMOTE DIRECTORY [filespec]@\Ask the remote server to display a directory
listing of the given files or, if the filespec is omitted, all the files in
the current device or directory.

REMOTE DISK-USAGE@\Ask the remote server to display information about its
disk usage (such as free or used space).

REMOTE ERASE filespec@\Same as REMOTE DELETE.

REMOTE FINISH@\Same as FINISH.

REMOTE HELP@\Ask the remote server to display a list of the commands it
can respond to.

REMOTE HOST command@\Ask the remote server to have its operating system
execute the given command.

REMOTE KERMIT command@\Ask the remote server to execute the given Kermit
command, given in the server Kermit's command syntax.

REMOTE LOGIN user password@\Log in to a remote Kermit server which has been
set up to require a username and password.

REMOTE MESSAGE text@\Send the text to the remote server for display on its
screen (useful with MS-DOS Kermit servers).

REMOTE SET parameter value@\Ask the remote server to set the given parameter
to the given value, for example REMOTE SET FILE TYPE BINARY.  Type REMOTE SET
? to see a list of the REMOTE SET options.

REMOTE SPACE@\Same as REMOTE DISK-USAGE.

REMOTE STATUS@\Ask the remote server to provide a status report.

REMOTE TYPE file@\Ask the remote server to display the named file on
the micro's screen.

REMOTE WHO [user]@\Ask the remote server for a list of users who are logged
in, or if a user is specified, for a report on the named user.
@end<description>

RENAME file1 file2@\Rename local CP/M file1 to file2.

@Index[SEND]SEND @i<filespec>@\Send file(s) specified by @i<filespec> to
the remote Kermit.  The @i<filespec> may contain CP/M wildcards.  SEND may
be abbreviated to the single letter S.

@Index[SET]SET @i<parameter> [@i<value>]@\Set the specified parameter to
the specified value.  Possible parameter settings:

@begin<description,leftmargin +8,indent -8>

@Index[Autoreceive]AUTORECEIVE@\ON (or OFF).  Allows several files to be 
received without having to type RECEIVE on the receiving machine.  The routine
simply looks for activity on the serial line, and if so fudges a RECEIVE 
command.  The packet sent by the sender will be lost.

@Index[Block Check]BLOCK-CHECK-TYPE @i<option>
@\The options are:
@begin<description,spread 0,leftmargin +8,indent -8>
1-CHARACTER-CHECKSUM@\Normal, default, standard 6-bit checksum.

2-CHARACTER-CHECKSUM@\A 12-bit checksum encoded as two characters.

3-CHARACTER-CRC-CCITT@\A 16-bit CCITT-format Cyclic Redundancy Check, encoded
as 3 characters.

@end<description>

@Index[Buffer size]BUFFER-SIZE @i<value>@\This allows you to set a buffer 
size during transfer of data.  On some systems it takes so long that the
remote end times out while the local system is reading or writing to disk.
The size is the number of 128 disk sectors (nominal) and can be from 1 
(128 bytes) to 64 (8 kbytes).

@\CP/M-80 filenames will still be mapped to uppercase characters.

@index<COLLISION>COLLISION value@\What to do when a file arrives that has
the same name as an existing file.  BACKUP means to rename the existing file.
DISCARD means to discard and reject the incoming file.  OVERWRITE means to
overwrite the existing file.  RENAME means to rename the existing file.

@Index[Debug]DEBUG@\ON (or OFF).  Enables/disables displaying of packets 
on the screen during file transfer.  Not performed if the QUIET option
has been set for the terminal (SET TERMINAL QUIET)

@Index[Default Disk]DEFAULT-DISK @i<drive letter>
@\This allows you to set the default 
disk as source and destination
of file transfers.  In addition, issuing this command causes you to switch to
the specified disk and log it in, write-@|enabled.
The colon must be included in the disk name (A:).
The selected disk appears
in your KERMIT-80 prompt, for instance @example[Kermit-80 14A:>]

@Index[Directory file size]DIRECTORY-FILE-SIZE ON (or OFF).

@\By setting DIRECTORY-FILE-SIZE OFF you can get an abreviated listing of your
disk drive.  File sizes are not calculated, and five files are shown on
a line.  Setting this option ON will show file sizes of each file.

@\Both options will list the free space remaining.

@Index[Escape Character]ESCAPE@\Change the escape character for
virtual terminal connections.  Kermit-80 will prompt you for the new
escape character, which you enter literally.

@Index[File-mode]FILE-MODE @i<option>
@\Tells KERMIT-80 what kind of file it 
is sending, so that KERMIT can correctly determine the end 
of the file.  SET FILE BINARY means to send all the
128-@|byte blocks (ie logical CP/M sectors) 
of the file, including the last block in its entirety; SET
FILE ASCII is used for text files, and transmission stops when the first
Control-Z is encountered anywhere in the file (this is the CP/M convention for
marking the end of a text file).

@\SET FILE-MODE DEFAULT tells Kermit to attempt to determine the file type by
examining the file being transmitted.  If a Control-Z appears before the
last block of the file, it is assumed to be BINARY; if, when the first
Control-Z is encountered, the remainder of the file contains only control-Z's,
it is assumed to be a text file.  Unfortunately, not all programs fill the
remainder of the last record of a text file with Control-Z's, 
so this algorithm is not always successful.

@\If binary transmission is used on a text file, or a compressed file 
(eg a .DQC file) some extraneous characters (up to 127 of them) 
may appear at the end of the file on the target system.  

@\If ASCII transmission is used on a binary file, any 8th bits set will
be stripped and a warning sent to the console.  When the first control-Z
is encountered, the file is assumed to be at the end, even if it is not.

@Index[Flow Control]FLOW-CONTROL ON (or OFF)
@\Sets XON/XOFF flow control on or off.  If set ON the host is expected
to respond to an XOFF or XON sent by Kermit-80.  If set off,
no flow control is assumed and any XON/XOFF is ignored.

@Index[IBM]IBM ON (or OFF)@\Allow the transfer of files to and from an IBM
mainframe computer.  This makes Kermit-80 wait for the IBM turnaround character
(XON), ignore parity on input, add appropriate parity to output, and use local
echoing during CONNECT.  As distributed, KERMIT-80 uses MARK parity for IBM
communication.  If you don't give this command, IBM mode is OFF.  Since IBM
VM/CMS KERMIT does not have timeout capability, SET IBM ON also turns on the
"fuzzy timer" automatically.

@Index[Local-Echo]LOCAL-ECHO ON (or OFF)@\When you CONNECT to a remote
host, you must set LOCAL-@|ECHO ON if the host is half duplex, OFF if
full duplex.  OFF by default.

@Index[Logging]LOGGING ON (or OFF)@\Cease or resume logging whenever 
connect mode is entered.  This is really only applicable after a LOG 
command is no longer required.

@Index[No-exit]NO-EXIT@\This command is applicable only for Kermit initiated
with a command tail.  For example, if Kermit was initiated by:

@\KERMIT ;SEND HELLO;NO-EXIT

@\Kermit would first seek out and execute the KERMIT.INI file (if present),
then send file HELLO to a remote system.  Usually Kermit would exit back
to CP/M, but NO-EXIT over-rides this.  STAY is a synonym for NO-EXIT.

@\Note the leading semicolon.  This clears leading spaces from the first
command.

@Index[OUTPUT]OUTPUT @i<text-line>@\Send a line of text to the remote computer
(or modem).  This simply copies the string to the correct line, and assumes all
appropriate parameters have been set to be used, e.g. speed, parity etc.
It is intended for use in TAKE command files.

@Index[Parity]PARITY @i<option>
@\Sets parity for outgoing characters to one of the
following: NONE, SPACE, MARK, EVEN, or ODD.  On input, if parity is NONE, then
the 8th bit is kept (as data), otherwise it is stripped and ignored.  The
parity setting applies to both terminal connection and file transfer.
If you set parity to anything other than none, KERMIT-80 will attempt to use
@Index<Eighth-Bit Prefix>
"8th bit prefixing" to transfer binary files.  If the other KERMIT is also
capable of 8th bit prefixing, then binary files can be transferred
successfully; if not, the 8th bit of each data byte will be lost (you will see
a warning on your screen if this happens).

@Index[Port]PORT @i<port name>
@\Allows you to switch between different communication ports. 
This command is not available on all systems.  
Type @q<SET PORT ?> for a list of valid options for your system. (Note: 
If your system does not support several ports, this command will 
return a "Not implemented" error if you try to set a port.)

@Index[PRINTER]PRINTER@\ON (or OFF)
@\Turns copying of CONNECT session to printer on and off.  It is also 
possible to toggle the printer on/off from the connect state, by
typing <escape character> followed by P.

@Index[Set Receive]RECEIVE @i<parameter> [@i<value>]
@\Set a RECEIVE parameter.

@begin<description, Spread 0, leftmargin +8,indent -8>

@Index[Pad character]
PAD-CHAR@\Set the PAD character to use while receiving files.
Currently a dummy, as for SET SEND PAD-CHAR.

@Index[Set padding]PADDING [value]
@\Set the number of PAD characters to use while receiving files. 
Same as SET SEND PADDING.

@Index[Set Start of packet]
START-OF-PACKET [value]
@\Set the default start of Packet character for receiving files.  Apply the
same rules and considerations as for SET SEND START-OF-PACKET.

PACKET-LENGTH number@\Tell the other Kermit the longest packet length CP/M
Kermit is willing to receive during file transfer.  The maximum length is 94,
which is also the default length.

@end<description>

@Index[Set Send]SEND @i<parameter> [@i<value>]
@\Set a SEND parameter.
@begin<description, spread 0, leftmargin +8,indent -8>

@Index[Pad character]
PAD-CHAR@\Set the Pad character to be used while sending files.
It is currently a dummy entry, and does not do anything.

@Index[Set Padding]
PADDING [value]
@\Set the number of PAD-CHARS to be used while sending files.  This
too does nothing.

@Index[Set Start of packet]
START-OF-PACKET@\Set the default start of packet character to
another character than control-A.  This may be necessary on systems
(including intervening networks) that trap control-A characters.  Choose
a control character not otherwise used, ie not carriage return (13D, ODH),
line feed (10D, OAN), tabs (09D, 09H), backspace (08H), and bell (07H)
or any other used between you and your remote system.

@end<description>

@Index[Baud]SPEED @i<value>
@\Change the baud rate of the communications port.  This
command only works on some systems.  @i<value> is the numeric baud rate
(300, 9600, etc.) desired.  Type SET SPEED followed by a question mark
for a list of supported baud rates.
On systems that do not support this command, you must set the port
baud rate from CP/M or other setup mechanism outside of KERMIT-80.

@Index[TacTrap]TACTRAP@\Set the TAC intercept character.  If you are attached
to a TAC it will swallow the intercept character (commercial AT sign by
default) so Kermit sends it twice.  With this command you can set the 
intercept character (ie the one to send twice) to another character.

@Index[VT52 Emulation]
@Index[Terminal Emulation]
@Index[External Terminal Emulation]
TERMINAL @i<option>
@\Select one of the following terminal characteristics:

@begin<description,spread 0.5,leftmargin +8,indent -8>

OFF@\sets emulation off, and its up to the attached terminal to 
respond to escape sequences sent from the remote host system.

DUMB@\Like off, but carriage return and line feed characters are
the only control characters accepted.  All other control characters are
simply ignored. (Really a "Glass TTY").

EXTERNAL@\Emulation is provided for by a routine in the system dependent
part of Kermit.  Attempting to set this option without having and 
externally supplied routine will returna "Not Implemented" error.

OFF@\All characters are passed directly to the terminal without any 
interpretation by Kermit.

VT52@\When connected as a terminal
to a foreign host, the micro emulates a VT52.  
VT52 emulation is set by default, except on micros
that already have terminal functionality built in, such as the DEC VT180 and
DECmate (these act as @index<VT100 Emulation>VT100-@|series terminals).  Some
systems emulate other terminals, like the ADM3A; see table @ref<-cpmterms>.

QUIET@\Do not display any file transfer information onto the console.
This mode is useful if you console takes a long time to update the display.
Only the file name is displayed.  DEBUGging information is not displayed
even if selected.

REGULAR@\Inverse of QUIET.  All packets etc displayed, as ususal.
@end<description>

@Index[TIMER]TIMER ON (or OFF)@\Enable or disable the "fuzzy timer".  The timer
is off by default, because in the normal case KERMIT-80 is communicating with a
mainframe KERMIT that has its own timer.  Mainframe KERMIT timers tend to be
more precise or adaptable to changing conditions.  You should SET TIMER ON if
you are communicating with a KERMIT that does not have a timer.  You should SET
TIMER OFF if you are communicating over a network with long delays.

@Index[USER]USER @i<user-number>
@\Sets another user number to be active.
Acceptable user numbers are 0 to 31, though it is recommended to use
user numbers 0 to 15 only.
This is really only useful for Winchester Systems with high disk capacities.

@Index[Warning]WARNING ON (or OFF)@\Warn user of filename conflicts when
receiving files from remote host, and attempt to generate a unique name by
adding "@q<&>" characters to the given name.  ON by default, which is
equivalent to SET COLLISION RENAME.
@end<description>

@Index[Show]SHOW@\Display all settable parameters.  You will get a page or so
of the status af all parameters that can be set using the SET command.

@Index[Status]STATUS@\The same function as Show.

STAY@\Equivalent to SET NO-EXIT.

@Index[Take]TAKE @i<filespec>@\Take characters and commands from the
specified file as if they were entered from the keyboard.
This is useful if you want to set up a batch job.  A command
file can send, get, receive, set functions
etc automatically.  A TAKE command can be interrupted with ^C.

@\An automatic "TAKE KERMIT.INI" is executed from the default drive
when Kermit-80 is loaded.  This can be used to set defaults of band rate,
parity, filetype, default drive etc.

@\If KERMIT.INI does not exist, control is given directly to the user.

@Index[TRANSMIT]TRANSMIT @i<filespec> @i<turnaround>@\Send the specified file
to the system on
the other end of the connection as though it were being typed at the terminal,
one line at a time.  Each line sent is terminated with a carriage return, and
any line feeds are stripped from the file sent.  
After each line has been sent Kermit waits for a character string
from the host (eg a acrriage return).  If not specified, a carriage 
return is assumed.  No KERMIT protocol is involved.
An asterisk (star) is sent to the console for every line sent, to indicate
how the transfer is progressing.
This is useful for sending files to systems that don't have a
KERMIT program.  During transmission, you may type one of these 
single-@|character commands:
@begin<description,spread 0,leftmargin +4, indent -4>
Control-C@\Cease transmission, and drop into terminal emulation mode.

CR@\(carriage return) Re-transmit the previous line.
@end<description>

@Index[Type]TYPE filespec@\Type a local CP/M file or files on the CP/M screen.
A Control-C 
will cancel the command and return to the Kermit prompt.  A Ctrl-X will cancel
the current file and go on to the next one, if any.
Typing any other character  
while the file is being displayed will suspend 
the output.  Another character will resume output.  

@Index[VERSION]VERSION@\Show the name, edit number, and edit date of several of
the modules that make up Kermit-80.

@end<description>

@section<Kermit-80 Flavors>
@Comment(begin<description, leftmargin -8, indent +2>)

Many of the systems supported use an external terminal, rather than a built-in
console.  Kermit may be further customized for these systems by defining
(at assembly time) the terminal type to be used.
If the terminal type is unknown or does not match any of the existing
terminal options, the generic "CRT" option may be selected.  In this case,
Kermit cannot do fancy screen control during file transfer; it simply types the
file names, packet numbers, and messages in sequence across and down the
screen.  This works best if you can put your micro or terminal in "autowrap"
mode; otherwise the packet numbers will pile up in the rightmost column; the
filenames and messages will always appear on a new line, however.
If no specific terminal has been selected, Kermit cannot do VT52 emulation;
it can act
as a "dumb terminal" (sometimes called a "glass TTY"), or else its own built in
terminal firmware provides cursor control functions independent of the Kermit
program.

@subsection<Generic Kermit-80>
@index<Generic Kermit-80>@index<8080> "Generic Kermit-80" is an implementation
of Kermit that should run on any 8080-@|compatible CP/M 2.2 system with no
modification
at all, or perhaps only a minor one.  Unlike other Kermit-80 implementations,
it contains no system-@|dependent manipulation of the serial port.
All I/O is done with standard CP/M BIOS@index<BIOS> calls, and I/O redirection
is done using the CP/M IOBYTE function, which, according to the Digital
Research @i<CP/M Operating System Manual>, is an optional feature of any
particular CP/M implementation.  If your system does not provide the IOBYTE
function, Generic Kermit-80 will not work; furthermore, not all systems that
implement IOBYTE do so in the same way.
The SET PORT command may be used to select the devices to be used for input
and output.   Table @ref<-cpmports> lists the options to the SET PORT command
and their effects.

@begin<table,use example,centered>
@bar()
@blankspace(1)
@ux(SET PORT @i<xxx>)    @ux(input from)      @ux(output to)
    CRT            CRT:            CRT:
    PTR            PTR:            PTP:
    TTY            TTY:            TTY:
    UC1            UC1:            UC1:
    UR1            UR1:            UP1:
    UR2            UR2:            UP2:
@caption<Kermit-80 SET PORT Options>
@tag<-cpmports>
@bar()
@end<table>

The default is SET PORT PTR.
In all cases, the console (CON:) and list (LST:) devices used are those
selected when Kermit is started.

 The reason all Kermit-80 implementations aren't
generic is that a good deal of speed is sacrificed by getting all services from
the operating system.  While a specific implementation of Kermit-80 may be able
to operate at 4800, 9600, or even 56 Kilo baud, 
generic Kermit will fail to work
on some systems at speeds in excess of 1200 baud.  In addition, many features
of Kermit require more specific knowledge of the hardware involved.  Generic
Kermit cannot send a BREAK signal, or change the baud rate, for example.

@subsection<CP/M 3 Kermit>

CP/M-3 Kermit (also known as CP/M-Plus Kermit) is a version of generic
Kermit-80, and should run on most CP/M-3 (CP/M-Plus) systems.  It uses the
auxilliary port (AUX:) to communicate to the remote Kermit.  The SET BAUD
and SET PORT commands are not supported; nor can a BREAK be sent.
Like generic Kermit-80, a terminal may be selected at assembly time.

@subsection<System-Specific Versions>

There are also many versions of Kermit-80 tailored to specific systems.
Most of these operate uniformly, but some of them take advantage (or suffer
limitations) of the specific system.  Here are some of the special features
for particular systems:

@begin<description, leftmargin +4, indent -4>
@ux<Amstrad>: -- Two versions:

@begin<description, leftmargin +4, indent -4>
PCW 8256@\The PCW 8256/8512 with the serial inerafce attached.

CPC 6128@\The 664 with add on memory and 6128 are both supported.  
Both systems must run CP/M Plus, so the 664 will need an add on RAM pack 
and CP/M upgrade.  A high speed transfer rate of 38k baud can be used 
between Amstrad computers.
@end<description>

@ux<ACCESS>:@\Access Matrix computer using port J5.  Supports SET
BAUD-RATE for rates of 300-9600 baud.

@ux<Apple II> -- four variations:
@begin<description,leftmargin +4,indent -4>
APMMDM:@\Apple with Z80 Softcard and Micromodem II in slot 2
Dialout capability provided in connect command; user is prompted for
phone number if carrier is not present.  During connect mode,
@q(^]D) drops carrier.  BYE command also causes carrier to be dropped.

AP6551:@\Apple with Z80 Softcard, and one of several 6551-based
communication cards; the slot number is a compile-time parameter
(default is slot 2).  SET BAUD-RATE supported; speeds are 110-19200
baud.

APCPS:@\Apple with Z80 Softcard and CP Multi-Function Card.  The slot
number is again a compile-time parameter.  SET BAUD-RATE is supported
for baud rates from 50 baud to 19200 baud.

AP6850:@\Apple II with Z80 Softcard and a 6850-based USART in slot 2-the
slot being a compile-time parameter.  SET BAUD-RATE is not supported.
@end<description>

@ux<BBC>:@\Acorn Computers BBC Computer with Acorn Z80 second
processor running CP/M-80.  Supports SET BAUD-RATE and can send breaks.

@ux<BigBoard II>:@\Uses serial port A.  To use port B, change mnport, mnprts,
and baudrt and reassemble.  Can generate BREAK.  SET SPEED supported;
speeds are 300-38400 baud.

@begin<multiple>
@ux<Cifer>:@\Originally coded for Cifer 1886 using the VL: port set
as TTYI: and TTYO: but works successfully on 18xx and 28xx
series machines.  

There are now two versions, each with two variations: Either running 
CP/M Version 2.2 or 3.0, and either using the VL: or AUX: ports.  The VL:
port version can only use seven bits of data, so parity prefixing is
required for binary file transfers.  This restriction is removed by
using the AUX: port.  For those interested, the problem is due to the 
interprocessor link between the video and CPU (!) boards.  The VL: port
is on the video board, and the AUX: port on the CPU board, 
and the inter processor link can only transfer seven bits of data.

Supports SET SPEED, and can generate breaks on
some models with a BREAK key.
@end<multiple>

@ux<Comart>:@\Comart Communicator-Similar to Northstar
equipment.  Can generate BREAK.

@ux<Compupro>:@\Based on Kermit 3.x, and has been merged into V4.09

@ux<CPT-85xx word processors>:@\Can generate BREAK.  SET SPEED supported;
speeds are 50-9600 baud.

@ux<Cromemco>:@\Cromemco computers with TU-ART card.  Supports SET
BAUD-RATE (110-9600 baud).

@ux<DEC DECmate II word processor (with Z80 card)>:@\Can generate BREAK.

@ux<DEC VT180 (Robin)>:@\Three output ports, referred to as COMMUNICATIONS,
GENERAL, and PRINTER.  Can generate BREAK.

@ux<Digicomp Delphi 100>:@\SET SPEED supported; speeds are 50-19200 baud.

@ux<Discovery>:@\Action Computer Enterprises "Discovery" Multi-user
Computer.  Uses Port B on an 83U user board.  Supports SET SPEED
for 50-19200 baud.  Can generate BREAK.

@ux<Epson>:@\Epson PX-8 with LCD display.  Although it is quite different
in displaying of Packet Information, it works as any other CP/M-80 Kermit.
Supports SET SPEED and can generate BREAK.

@ux<Generic Kermit>:@\Two versions, one for CP/M version 2@q<.>2 and 
version 3.  These systems use IOBYTE flipping (V2@q<.>2) and the AUX: 
device to communicate to the serial line.  You may have to SET PORT xxx
before the version 2@q<.>2 will work, as Kermit needs to know what device
is the serial line.

@ux<Genie>:@\Eaca Video Genie.

@ux<Heath>: Three Versions:
@begin<description,leftmargin +4,indent -4>
H8QUAD@\for Heath-8 systems with the quad io board.  This system has been
derived from V3.x code.  Note that this version will not run "as is" on H89
systems.

H89@\For Heath-89 machines suports baud rates from 50 to 56,000 baud.

Z100@\For Z-100 running CP/M-85.  This version does not support
setting of baud rates.

@end<description>

@ux<Intertec Superbrain>: Two Versions:
@begin<description,leftmargin +4,indent -4>
BRAINA@\For superbrain using AUX port.  Breaks and SET BAUD both supported

BRAINM@\As above, but using the MAIN port.
@end<description>

@ux<Ithaca>:@\Ithaca Intersystems based computer using the VIO card for 
all IO to the outside world.  The system is strictly speaking a 
home-brew variant of the Ithaca machine, using an S100 cardcage 
without a front panel.  It uses the Extended BIOS by EuroMicro of London.  
However, I see no reason for this version not running on a genuine 
Ithaca Intersystems machine.  There are patches needed to the EuroMicro
BIOS to make this version work.

@ux<Kaypro:>@\Should work on most Kaypro models, as well as some related
systems (Ferguson BigBoard I, Xerox 820).  For the newer Kaypros with multiple
ports, Kermit uses the one labeled "serial data"; it cannot use the serial
printer or internal modem ports (but it should be possible to modify the values
for mnport, mnprts, and baudrt to do this).  Can generate BREAK.  SET SPEED
supported; speeds are 50-19200 baud.

@ux<Lobo>:@\Lobo MAX-80.  Supports SET SPEED and can generate BREAKS.

@ux<Merlin>:@\British Telecom Merlin M2215 (also Rair Black Box, possibly
also the ICL PC?).  Requires a terminal.

@ux<Microbee>:@\Microbee Systems computer made in Australia.  Works on
Microbee 56K (Series 2 APC), 64K (Computer in a Book), 128K (Dynamic), and
256K (256TC).  Can generate BREAK.  SET BAUD-RATE supported; speeds are
75-9600.  All serial I/O is via software, not hardware.  Simultaneous transmit
and receive possible on all speeds except 75/1200, 1200/75, 4800, and 9600.

@ux<Micromate>:@\PMC 101 Micromate.  Supports SET SPEED and can
generate BREAK.

@ux<Micromint>: Two versions
@begin<description, leftmargin +4, indent -4>
S6@\The Ciarcia/Micromint sb-180 board with a 6Mhz procoessor.  System
requires a terminal.

S9@\As above, but with a 9Mhz processor.
@end<description>

@ux<NCR>:@\Decisionmate 5.  Uses the 2651 and is largely 
the same as the Ithaca Intersystems machine implementation.


@ux<Northstar>: -- There are four versions available:
@begin<description,leftmargin +4,indent -4>
NORTHS:@\Northstar Horizon with HS10-4 board.  Supports SET SPEED
and SET PORT.

HORIZON:@\Northstar Horizon using the serial ports on the Mother
board.  Can generate BREAK.

BASICNS:@\Basic Northstar Horizon using the printer port.  
Can generate BREAK.

ADVANT:@\Northstar Advantage.  Supports SET SPEED and can
generate BREAK.  Traps Control-0 in the system filter.
@end<description>

@ux<Morrow Decision I>:@\Uses the Multi-I/O board.  Port 1 is the console, port
3 is the communications line.  SET SPEED supported; speeds are 75-56000
baud.

@ux<Morrow Micro Decision I>:@\

@ux<Nokia MicroMikko>:@\
Will not echo control-O (which locks keyboard).  SET SPEED
supported; speeds are 75-9600 baud.

@ux<Ohio Scientific>:@\Doesn't have screen control.

@ux<Osborne 1>:@\Uses serial line, not internal modem.  Left-arrow 
key generates
<DEL> ("delete" or "rubout" character) during connect mode.  SET SPEED
supported; speeds are 300 and 1200 baud.  Now supports multi-sector buffering.

@ux<Research Machines>: Two Versions:
@begin<description,leftmargin +4,indent -4>
RM380ZM:@\380Z and 5.25" disks supports SET BAUD.RATE

RM380ZF:@\380Z and 8" disks, otherwise as above.
@end<description>

@ux<Sanyo>:@\Sanyo MBC-1100.  This version derived from Kermit V3.x

@ux<ScreenTyper>:@\Details unkown.

@ux<TRS-80>: Three versions:
@begin<description,leftmargin +4,indent -4>
TRS80LB:@\TRS-80 with Lifeboat CP/M

TRS80PT:@\TRS-80 with Pickles and Trout CP/M

TRSM4:@\TRS-80 Model 4 with Montezuma CP/M
@end<description>

@ux<Teletek>:@\Teletek Systemaster. Supports SET BAUD.

@ux<Telcon>:@\TELCON ZOBRA portable computer.

@ux<Torch>:@\Torch Unicorn 5 initially, but the code runs on other
Z80 based CP/N (as in Nut!) systems.  It uses the BBC Computer as a
"Base processor", and is similar to the BBC version.  The base processors
RS423 port is used rather than any built in Modem.
(UK telecoms legislation effectively makes modem control software
tricky business...).  Two potential versions exist-one using cursor
positioning codes for a MCP  and CCCP ROM combination of revision less
than 1.00, the other version uses the additional facility MCP/CCCP
versions greater than 1.  Supports SET SPEED and can generate BREAKs.

@\Note that binary files must be transferred using SET PARITY to anything
other than NONE!  Parity is neither generated nor checked.

@ux<US Micro Sales>:@\S-100-8 based computer.

@ux<Vector Graphics>:@\Vector

@ux<Xerox>:@\Xerox 820.

@ux<Z80MU>:@\Development Kermit on a PC running the Z80MU Z80 and CP/M 2@q<.>2
development system.  Allows development of the system independent modules
to be done on an IBM PC or clone.  Also allows the generation of new .HEX 
files, that may then be KERMITed to the target system.  Note:  Not all 
the BDOS or BIOS routines are supported, so avoid "unusual" BIOS/BDOS calls.
(For example, DIR from within Kermit will fail as one of the BIOS routines
returning disk parameters is not supported.)
@end<description>

@section<Installation of Kermit-80>

Kermit-80 was written originally for the Intertec SuperBrain in
lowest-@|common-@|denominator @Index[8080] 8080 code with the standard
assembler, ASM (single source module, no macros, no advanced instructions), so
that it could be assembled on any CP/M-80 system (the 8080 assembler is
distributed as a standard part of CP/M-80, whereas the fancier Z80@Index[Z80]
or macro assemblers are normally commercial products).  It has since been
modified to run on many other systems as well.  Kermit-80 should be able to run
on any 8080-, 8085- or Z80-@|based microcomputer under @Index[CP/M] CP/M with
appropriate minor changes to reflect the port I/O and screen control for the
system (see below).

The proliferation of new systems supported by Kermit-80 made the program grow
so large and complicated that it had to be broken up into system-@|independent
and system-@|dependent modules, as of version 4 (this was done by Charles
Carvalho of ACC).  Each module is composed of multiple files.  This has reduced
the time and disk space necessary for assembly; Kermit-80 may once again be
assembled on a CP/M system with roughly 250Kbytes of space.  The majority of
the code does not need to be reassembled to support a new system.
Unfortunately, it can no longer be assembled with ASM, since ASM does not
support multiple input files.  To allow it to be assembled on any CP/M system,
the public-domain assembler LASM is included in the distribution kit. Kermit-80
may also be assembled with Microsoft's M80 (not supplied).  In theory, any 8080
assembler supporting the INCLUDE directive ought to work, as well.

All versions of Kermit-80 are assembled from the same set of sources, with
system dependencies taken care of by assembly-@|time conditionals within the
system-@|dependent module (eventually, the system-@|dependent module will
itself be broken up into multiple files, one for each system).  The most
important system dependencies are terminal emulation (when CONNECTed to the
remote host) and screen handling, which are dependent on the individual micro's
escape codes (these features are table driven and easily modified for other
CP/M systems), and the lowest level I/O routines for the serial communications
port.  The port routines are best done only with BDOS calls, but some systems
do not allow this, primarily because the BDOS routines strip the parity bit
during port I/O, and the parity bit is used for data when transmitting binary
files.

Kermit-80's I/O routines must check the port status and go elsewhere if no
input is available; this allows for virtual terminal connection, keyboard
interruption of stuck transmissions, etc.  On systems that fully implement I/O
redirection via the optional CP/M IOBYTE facility, this may be done by
switching the IOBYTE definition.  On others, however, IN/OUT instructions
explicitly referencing the port device registers must be used.

@index<Timeout>
CP/M-80 KERMIT versions 3.8 and later include a "fuzzy timer" that allows a
timeout to occur after an interval ranging from 5 to 20 seconds (depending upon
the speed of the processor and the operating system routines) during which
expected input does not appear at the port.  In this case, retransmission
occurs automatically.  In any case, you may type a carriage return during
transmission to simulate a timeout when the transfer appears to be stuck.

@subsection<Organization of Kermit-80>
Kermit-80 consists of two modules, each of which is generated from multiple
source files.  The first module contains the system-@|independent code;
the second module is configured for a particular system and merged with
the system-@|independent module to produce a customized Kermit-80.

The distribution kit contains:
@begin<itemize,spread 0>
the system-@|independent module, @q<CPSKER.HEX>;

the system-@|dependent modules, @q<CPV*.HEX> (see table @ref<-cpmsystems1>
and @ref<-cpmsystems2>);

the source files, @q(CPS*.ASM) and @q(CPX*.ASM),

the public-domain CP/M assembler, @q<LASM.*>,

the public-domain CP/M load/patch utility, @q<MLOAD.*>
@end<itemize>

@Comment(NewPage<> added for local manual)
@begin<table,use verbatim,leftmargin +0>
@bar()
@blankspace(1)
@u(Symbol  Filename System)
@blankspace(0.25)
ACCESS  CPVACC  @r<Access Matrix>
ADVANT  CPVADV  @r<Northstar Advantage>
AP6551  CPVAPL  @r<Apple II, Z80 Softcard, 6551 ACIA in serial interface>
AP6850  CPVA65  @r<Apple II, Z80 Softcard, 6850 ACIA in Serial Iiterface>
APMMDM  CPVAPM  @r<Apple II, Z80 Softcard, Micromodem II in slot 2>
APCPS   CPVCPS  @r<Apple II, Z80 Softcard, with CPS multifunction card>
BASICNS CPVBNS  @r<Northstar Horizon (terminal required)>
BBC     CPVBBC  @r<Acorn "BBC" computer with Acorn Z80 second processor>
BBII    CPVBB2  @r<BigBoard II (terminal required)>
BRAINM  CPVBRM  @r<Intertec Superbrain using the main port>
BRAINA  CPVBRA  @r<Intertec Superbrain using the Aux port>
CIFER2  CPVCIF  @r<Cifer 1886 using the VL: Serial port and CP/M V2.2>
CIFER3  CPVCI3  @r<Cifer 1886 using the VL: Serial port and CP/M V3.0>
CIFER2  CPVCA2  @r<Cifer 1886 using the AUX: Serial port and CP/M V2.2>
CIFER3  CPVCA3  @r<Cifer 1886 using the AUX: Serial port and CP/M V3.0>
CMEMCO  CPVCRO  @r<Cromemco with TU-ART card. Terminal required)>
COMART  CPVCOM  @r<Comart Communicator (terminal required)>
COMPRO  CPVPRO  @r<Compupro with Interfacer 4 (or 3).  Terminal required.>
CPC     CPVCPC  @r<Amstrad CPC 664 and 6128 and CP/M 3>
CPM3    CPVCP3  @r<"Generic": CP/M 3.0 (CP/M Plus) systems (terminal req'd)>
CPT85XX CPVCPT  @r<CPT-85xx wordprocessor with CP/M>
DELPHI  CPVDEL  @r<Digicomp Delphi 100 (terminal required)>
DISC    CPVDIS  @r<Action Computer Enterprises "Discovery" (terminal req'd)>
DMII    CPVDM2  @r<DECmate II with CP/M option>
GENER   CPVGEN  @r<"Generic": CPM 2.2 systems with IOBYTE (terminal req'd)>
GENIE   CPVGNI  @r<Video Genie>
H8QUAD  CPVH8Q  @r<Heath-8 with Quad 8 i/o board>
HEATH   CPVH89  @r<Heath/Zenith H89>
HORIZON CPVHOR  @r<Northstar Horizon (terminal required)>
KPII    CPVKPR  @r<Kaypro-II (and 4; probably supports all Kaypro systems)>
LOBO    CPVLBO  @r<Lobo Max-80>
@begin<text,facecode R,above 1>
"symbol" is the symbol used to select the target system, in @q<CPVTYP.ASM>;

"filename" is the name under which the module is supplied in the distribution.
@end<text>
@caption<Systems supported by Kermit-80 (Part 1)>
@bar()
@tag<-cpmsystems1>
@end<table>


@Comment(NewPage<> added for local manual)
@begin<table,use verbatim,leftmargin +0>
@bar()
@blankspace(1)
@u(Symbol  Filename System)
@blankspace(0.25)
M2215   CPVMRL  @r<British Telecom Merlin/Rair Black Box (terminal required)>
MBEE    CPVBEE  @r<Microbee>
MDI     CPVMDI  @r<Morrow Decision I (terminal required)>
MIKKO   CPVMIK  @r<MikroMikko>
MMATE   CPVMM   @r<PMC 101 Micromate (terminal required)>
MMDI    CPVUD   @r<Morrow Micro Decision I (terminal required)>
NCRDMV  CPVDMV  @r<NCR Decision Mate V.  (Terminal required?)>
NORTHS  CPVNS   @r<Northstar Horizon with HSIO-4 card (terminal req'd)>
OSBRN1  CPVOSB  @r<Osborne 1>
OSI     CPVOSI  @r<Ohio Scientific>
PCI2651 CPVPCI  @r<Ithaca Intersystems with VI0 card (terminal required)>
PCW     CPVPCW  @r<Amstrad PCW 8256/8512 with serial interface>
PX8     CPVPX8  @r<Epson PX-8>
RM380ZM CPVRMM  @r<Research Machines 380Z with MDS (5.25" discs)>
RM380ZF CPVRMF  @r<Research Machines 380Z with FDS (8" discs)>
ROBIN   CPVROB  @r<DEC VT180>
S1008   CPVUSM  @r<US Microsales S-100-8 (terminal required)>
SANYO   CPVSAN  @r<Sanyo MBC-1100>
SB6     CPVSB6  @r<Micromint SB-180 with 6Mhz CPU (terminal required)>
SB9     CPVSB9  @r<Micromint SB-180 with 9Mhz CPU (terminal required)>
SCNTPR  CPVSCN  @r<Screentyper>
TELCON  CPVTEL  @r<TELCON Zobra portable>
TELETEK CPVTET  @r<Teletek Systemaster>
TORCH   CPVTRC  @r<Torch computers BBC-B with Z80 second processors>
TRS80LB CPVTLB  @r<TRS-80 model II with Lifeboat 2.25C CP/M Display>
TRS80PT CPVTPT  @r<TRS-80 model II with Pickles + Trout CP/M Display>
TRSM4   CPVTM4  @r<TRS-80 model IV>
VECTOR  CPVVEC  @r<Vector Graphics>
XER820  CPVXER  @r<Xerox 820>
Z100    CPVZ00  @r<Z-100 under CP/M-85>
Z80MU   CPVZ80  @r<Z80MU development system on a PC>
@begin<text,facecode R,above 1>
"symbol" is the symbol used to select the target system, in @q<CPXTYP.ASM>;

"filename" is the name under which the module is supplied in the distribution.
@end<text>
@caption<Systems supported by Kermit-80 (Part 2)>
@bar()
@tag<-cpmsystems2>
@end<table>

@Comment(NewPage added for local manual)
@NewPage()
@begin<table,use verbatim,leftmargin +0>
@bar()
@blankspace(1)
@u(Symbol  Terminal type)
@blankspace(0.25)
CRT     @r<Dumb terminal type.  Does not do cursor addressing>
ADM3A   @r<Lear Seigler ADM 3A>
ADM22   @r<Lear Seigler ADM 22>
AM230   @r<Ampro 230>
H1500   @r<Hazeltine 1500>
SMRTVD  @r<Netronics Smartvid>
SOROQ   @r<Soroq IQ-120>
TVI912  @r<Televideo 912>
TVI925  @r<Televideo 925 or Freedom 100>
VT52    @r<Dec VT52 or equivalent (H19)>
VT100   @r<Dec VT100 or equivalent>
WYSE    @r<Wyse 100>
@begin<text,facecode R,above 1>
"symbol" is the symbol used to select the target system, in @q<CPXTYP.ASM>;

"Terminal type" is the type of terminal "symbol" selects.
@end<text>
@caption<Terminals supported by Kermit-80>
@bar()
@tag<-cpmterminals>
@end<table>
@Comment(NewPage<> removed again)

@Comment<for Installation of kermit-80>

@subsection<Downloading Kermit-80>

You'll need either a pre-configured @q<.COM> file or the system-@|independent
module, @q<CPSKER>, in binary (@q<.COM>) or hex (@q<.HEX>) format and the
system-@|dependent overlay for your system (from Tables @ref<-cpmsystems1> and 
@ref<-cpmsystems2>).  If
your system is not listed in the table, get the generic CP/M 2@q(.)2 Kermit or
the generic CP/M 3 Kermit.  If you already have a version of Kermit on your
micro and you want to install a new version, simply use your present version to
get the new files.  Transfer the files to your system and skip ahead to
"merging the modules".

If you do not have a copy of Kermit on your micro, and you cannot borrow a
Kermit floppy but you do have access to a mainframe computer with a copy of the
Kermit-80 distribution, you should read this section.

@Index[Bootstrapping CP/M Kermit]@index<Downloading>
 There are several ways to get CP/M Kermit from a host system to your micro.
The easiest is to "download" the necessary "hex" files into your micro's
memory and then save them on the disk.  If you have a terminal emulator program
on your micro which can save a copy of the session to disk, connect to your
host, and type the necessary files.  Exit from the emulator, saving the
session log, and edit the session log to extract the hex files.  Skip ahead to
"merging the files".

The following is a procedure which, though far from foolproof, should allow you
to get a version of Kermit to your CP/M based micro.  It depends upon the host
prompt, or at least the first character of the host prompt, being some
character that cannot appear in a hex file (the valid characters for hex files
are the digits 0-9, the upper case letters A-F, the colon ``@q<:>'', carriage
return, and line feed).  As soon the prompt character is encountered, the
transfer will terminate.  If your host does not issue a prompt that will
accommodate this scheme, you can achieve the same effect by adding an atsign
``@@'' to the very end of the hex file before sending it from the host.  The
program below looks for an atsign (the normal DEC-20 prompt, hex 40).
DECSYSTEM-10 users would look for a dot, hex 2E; VAX/VMS or UNIX users would
look for a dollar sign, hex 24; UNIX C-Shell users would look for a percent
sign, hex 26.

@Begin <Enumerate>
For CP/M 2@q<.>2 systems, connect to a floppy disk with plenty of free space.
Run DDT and type in the following (the comments should not be typed in;
they are there just to tell you what's happening): (Note that this wont work
for CP/M Plus or 3@q<.>0 systems!)
@Begin<figure, use Example, leftmargin +0>
@bar()
@blankspace(0.25)
-a100                   ;Begin assembling code at 100
0100    LXI H,2FE       ;Where to store in memory
0103    SHLD 200        ;Keep pointer there
0106    MVI E,D         ;Get a CR
0108    MVI C,4         ;Output to PUNCH (send to HOST)
010A    CALL 5
010D    MVI C,3         ;Input from READER (read from HOST)
010F    CALL 5
0112    ANI 7F          ;Strip parity bit
0114    PUSH PSW        ;Save a and flags
0115    MOV E,A         ;Move char to E for echo
0116    MVI C,2         ;Output to screen
0118    CALL 5
011B    POP PSW         ;Restore A and flags
011C    CPI 40          ;(or 4E,24,26,etc) System prompt?
011E    JZ 127          ;Yes, have whole file in memory
0121    CALL 17A        ;No, store another byte
0124    JMP 10D         ;Read another byte
0127    MVI A,1A        ;Get a Control-Z (CP/M EOF mark)
0129    CALL 17A        ;Store it in memory
012C    LXI H,300       ;Get memory pointer
012F    SHLD 202        ;Store as DMA pointer
0132    LDA 201         ;Get 'HI' byte of memory pointer
0135    STA 200         ;and store it as 'LO' one
0138    XRA A
0139    STA 201         ;Zero 'HI' byte (slow *256)
013C    MVI C,16        ;Make NEW file
013E    LXI D,5C        ;With FCB1
0141    CALL 5
0144    CALL 15E        ;Write 128 bytes (sector)
0147    CALL 15E        ;Write another sector
014A    LXI H,FFFF      ;Get a 16-bit Minus One
014D    XCHG            ;into DE
014E    LHLD 200        ;Get 256-byte counter
0151    DAD D           ;Decrement
0152    SHLD 200        ;and store back
0155    MVI A,2         ;Check if
0157    CMP L           ; 256-byte counter down to offset
0158    JZ 183          ;Yes, we're done
015B    JMP 144         ;Keep writing..
015E    LHLD 202        ;Get file-pointer
0161    XCHG            ;into DE
0162    MVI C,1A        ;Set DMA-address
0164    CALL 5
0167    MVI C,15        ;Write sector (128 bytes)
0169    LXI D,5C        ;using FCB1
016C    CALL 5
016F    LHLD 202        ;Get file-pointer
0172    LXI D,80        ;128-bytes
0175    DAD D           ;added to file-pointer
0176    SHLD 202        ;and save
0179    RET             ;and return
017A    LHLD 200        ;Get Memory-pointer
017D    MOV M,A         ;Store character
017E    INX H           ;Increment Pointer
017F    SHLD 200        ;and save
0182    RET             ;and return
0183    MVI C,10        ;CLOSE file
0185    LXI D,5C        ;using FCB1
0188    CALL 5
018B    JMP 0           ;Force WARM BOOT
0179
-^C                     ;(Type Control-C) Return to CP/M
A>SAVE 1 FETCH.COM      ;Save program, we need to run it twice.
@caption<Bootstrap program for Kermit-80 and CP/M Version 2.2>
@bar()
@tag<-cpmboot>
@end<Figure>
Alternatively, an assembler source file for this program is distributed
with CP/M Kermit as @q<CPKFET.ASM>.  You might prefer to type the assembler
version in and assemble and load it (ASM CPKFET, LOAD CPKFET, or MASM CPKFET,
MLOAD CPKFET), to let the assembler and loader catch any typing errors.

Connect to your host using a terminal or a terminal emulation program.  Ensure
that your host does not have your terminal in "page mode" (does not pause
at the end of each screenful).

Tell the host to display the first hex file (the system-independent module)
at your terminal, e.g. give a command like @q<TYPE CPSKER.HEX>, @i<@u(without)
a terminating carriage return>.

Return to your micro by switching the cable from the terminal to the micro,
or by terminating the micro's terminal program.

Make sure your IOBYTE is set so that @q<RDR:> and @q<PUN:> correspond to the
I/O port that is connected to the host (this would normally be the case
unless you have done something special to change things).

Load the program you entered in the first step with DDT, and use it to capture
the first hex file:
@Begin<Example,Free>
DDT FETCH.COM
-icpsker.hex            ;Setup FCB for file CPSKER.HEX
-g100,179               ;Execute the program.
@End<Example>
Now there should be a file @q<CPSKER.HEX> on your connected disk.

Return to the host, and tell it to display the second hex file (the
system-@|dependent module for your configuration).  Again, do not type the
terminating carriage return.

Return to your micro, and run the capture program again:
@Begin<Example,Free>
DDT FETCH.COM
-icpxovl.hex            ;Setup FCB to create CPXOVL.HEX
-g100,179               ;Execute the program.
@End<Example>
Now there should be a file @q<CPXOVL.HEX> on your connected disk.  Replace
@q<CPXOVL.HEX> in this example with the appropriate overlay file for your
system.
@end<enumerate>
Merging the files:
@begin<enumerate>
For purposes of illustration, we will assume the system-@|dependent overlay is
called "cpxovl@q<.>hex".  The two hex files may be combined with MLOAD or DDT.
If you already have a running Kermit, you can transfer @q<MLOAD.HEX> to your
system and create @q<MLOAD.COM> by running LOAD.  If you're bootstrapping
Kermit, you could transfer @q<MLOAD.HEX> to your system the same way you got
the other two @q<.HEX> files, but it's probably simpler to use DDT to get
Kermit running, and get MLOAD later if you need it.

Using MLOAD, the two pieces may be easily merged:
@begin<example>
A>@ux(mload kerm411=cpsker,cpxovl)
@i[(Some messages about program size, etc...)]
A>
@end<example>

If you don't have MLOAD running, it's a bit more complex:
@begin<example>
A>@ux<ddt cpsker.hex>
NEXT  PC
3500 0100
-@ux<icpxovl.hex>
-@ux<r>
NEXT  PC
xxxx 0000
-@ux<^C>
A>@ux<save @i(dd) kerm411.com>
@end<example>
The page count ("dd") used in the SAVE command is calculated from the last
address ("xxxx") given by DDT in response to the R command: drop the last two
digits and add 1 if they were not zero, then convert from hexadecimal (base 16)
to decimal (base 10): 684F becomes 69 hex, which is 105 decimal (5 times 
16 plus 9) -- but 6700 becomes 67 hex, or 103 decimal (consult an 
introductory computing book if you don't understand number base conversion).

If you are using the Z80MU CP/M and Z80 development toolkit on an IBM PC 
or clone, then follow the same instructions as for a genuine CP/M system.
When you have loaded your file, you will have to ship the .COM or two 
.HEX files to the target CP/M system. (Possibly using a previous 
issue of Kermit?)


Note that CP/M hex files have checksums on each line.  If there were any
transmission errors during the downloading process, MLOAD or DDT will notice a
bad checksum and will report an error (something like "Illegal Format").  If
you get any errors during loading, either fix the hex file locally with an
editor, or repeat the transfer.

@End<Enumerate>

You now should have a running version of Kermit-80, called @q<KERM411.COM>.

Test your new Kermit by running it.  If it gives you a prompt, it might be
OK. (don't delete your old one yet...).  Instead of a prompt, you could get
one of two messages indicating that the configuration information is invalid:
@example<?Kermit has not been configured for a target system>
or
@example<?Consistency check on configuration failed>
Of course, neither of these messages should appear if you're building Kermit
from the distribution kit.  The first message indicates that the overlay was
not found where the system-@|independent module expected to find it, probably
because the overlay address is incorrect; the second indicates that the version
of CPXLNK used in the system-@|dependent module is incompatible with the
system-@|independent module.

Once you are satisfied that KERMIT40 works correctly, you should rename your
old @q<KERMIT.COM> to something else, like @q<OKERMIT.COM>, and rename
@q<KERMIT40.COM> to @q(KERMIT.COM).

@subsection<Assembling Kermit-80 from the sources>

Kermit-80 is built in two pieces from the following files:
@begin<description,spread 0>
@i(The system-independent files:)

@q<@ @ CPSKER.ASM>@\header file

@q<@ @ CPSDEF.ASM>@\definitions for both KERMIT and KERSYS

@q<@ @ CPSMIT.ASM>@\initialization, main loop, miscellaneous commands
(BYE, EXIT, LOG, SET, SHOW, STATUS, and VERSION)

@q<@ @ CPSCOM.ASM>@\second part of commands, status and set file

@q<@ @ CPSPK1.ASM>@\part 1 of the KERMIT protocol handler
(SEND, RECEIVE, LOGOUT,and FINISH commands)

@q<@ @ CPSPK2.ASM>@\part 2 of the KERMIT protocol handler

@q<@ @ CPSREM.ASM>@\REMOTE routines (FINISH, BYE and LOGOUT in CPXPK*.ASM)

@q<@ @ CPSSER.ASM>@\SERVER routines (for the future)

@q<@ @ CPSTT.ASM>@\the transparent commands (TRANSMIT, CONNECT)

@q<@ @ CPSCPM.ASM>@\CP/M commands (DIR, ERA, USER, TYPE, PRINT, COPY)

@q<@ @ CPSWLD.ASM>@\the wildcard handler

@q<@ @ CPSCMD.ASM>@\the command parser

@q<@ @ CPSUTL.ASM>@\utility routines and data

@q<@ @ CPSDAT.ASM>@\data space and the overlay definitions

@q<@ @ CPXLNK.ASM>@\linkage area description

@blankspace(1)
@i(The system-dependent files:)

@q<@ @ CPXTYP.ASM>@\system selection

@q<@ @ CPXLNK.ASM>@\system overlay specification and jump table

@q<@ @ CPXCOM.ASM>@\common routines for all systems

@q<@ @ CPXSWT.ASM>@\system selector or switcher

@blankspace(1)
One of:

@q<@ @ CPXSYS.ASM>@\family file for some system-specific code

@q<@ @ CPXTOR.ASM>@\family file for Torch, Superbrain, PCI2651 etc

@q<@ @ CPXNOR.ASM>@\family file for Northstar and Comart machines

@q<@ @ CPXMRL.ASM>@\family file for British Telecom Merlin/Rair Black Box

@q<@ @ CPXSB.ASM>@\family file for Micromint SB-180 systems

@q<@ @ CPXCIF.ASM>@\family file for Cifer systems

@q<@ @ CPXHEA.ASM>@\family file for Heath/Zenith systems

@q<@ @ CPXAPP.ASM>@\family file for Apple II systems

@q<@ @ CPXPCW.ASM>@\family file for Amstrad PCW 8256/8512 machines

@q<@ @ CPXBBI.ASM>@\family file for BigBoard, Kaypro and Xerox 820 systems

@q<@ @ CPXBEE.ASM>@\Microbee

@q<@ @ CPXSYO.ASM>@\family file for Sanyo MBS-1100 systems

@q<@ @ CPXTM4.ASM>@\family file for Tandy Model 4 with CP/M systems

@q<@ @ CPXGNI.ASM>@\family file for Video Genie systems

@q<@ @ CPXPRO.ASM>@\family file for Compupro systems

@q<@ @ CPXZ80.ASM>@\family file for the Z80MU development system

@blankspace(1)
and if you use a terminal,

@q<@ @ CPXVDU.ASM>@\display codes for VDUs etc.  Not always required
@end(description)
The system-@|independent module contains all of the system-@|independent files
except for @q(CPXLNK.ASM), which is assembled into the system-@|dependent
module to provide the structures needed to connect the two modules.  As
distributed, the system-@|independent module is named @q(CPSKER.HEX).  If you
have a copy of @q(CPSKER.HEX), you do not need to reassemble the
system-@|independent module to configure Kermit for your system.

The system-@|dependent module consists of @Q(CPXTYP.ASM), @Q(CPSDEF.ASM),
@Q(CPXLNK.ASM), @q(CPXSWT.ASM), @q(CPSCOM.ASM), one of the family files
@Q(CPXSYS.ASM), @q(CPXTOR.ASM), @q(CPXMRL.ASM), @q(CPXSB.ASM), @q(CPXCIF.ASM),
@q(CPXHEA.ASM), @q(CPXBBI.ASM), @q(CPXTM4.ASM), @q(CPXGNI.ASM), @q(CPXNOR.ASM),
@q(CPXAPP.ASM), @q(CPXPCW.ASM), or @q(CPXPRO.ASM), and possibly @q(CPXVDU.ASM),
if your system uses a terminal for the console.  One copy of the
system-@|dependent module is supplied already assembled for each supported
system; the filename may be obtained from tables @ref<-cpmsystems1> and
@ref<-cpmsystems2>.  If a terminal is required for a system, a CRT (glass TTY
device) has been selected.

After assembling the two pieces separately, they are combined with DDT or
MLOAD into a system-@|specific Kermit.

If you want to rebuild the system-@|independent module, the only change you
may need to make is to select the assembler to be used, in @Q(CPSKER.ASM).
Define one of MAC80, M80, or LASM to TRUE to select it as the assembler;
the others should be defined FALSE.

Assuming you have the Microsoft Macro Assembler package (M80/L80), you'll
need to do the following:
@begin<example>
A>@ux(m80 cpsker=cpsker.asm)
A>@ux(l80 /p:100,cpsker,cpsker/n/e)
@end<example>
This will produce @Q(CPSKER.COM).

If you are using LASM instead, do this:
@example(A>@ux<lasm cpsker>)
LASM will generate @Q(CPSKER.HEX) and @Q(CPSKER.PRN).  LASM allows options to
be specified in the same way as the standard assembler, ASM, so the command
@example[A>@ux(lasm cpsker.abz)]
will read the source files from drive A, send the @q(.HEX) file to drive B,
and suppress the listing file.

If you are using the Z80MU development system on an IBM PC or clone, then
assemble your files using either LASM and MLOAD or M80 and L80, as if you
were using a genuine CP/M-80 system.  Note that you will still have the 
problem of transferring your assembled files to the target CP/M system.

If you want to generate a system-@|dependent overlay for a particular system,
or want to change the terminal supported, you'll need to check three areas in
@Q(CPXTYP.ASM):

First, the overlay start ADDRESS.  The symbol "ovladr" is EQUated to the
address of "LNKFLG" in the system-@|independent module, as the starting address
of the overlay (7000H for version @value(-cpmversion)).  You'll need to know
this value if you're building the overlay with M80/L80.  You won't normally
need to change this value.

Second, the assembler being used.  Again, define one of MAC80, M80, and LASM
to be TRUE to select it, and define the others to be FALSE.  The two modules
(system-@|independent and system-@|dependent) do not need to be built with the
same assembler.

Third, the system configuration.  Locate your system in tables
@ref<-cpmsystems1> and @ref<-cpmsystems2>, then define the appropriate symbol
TRUE, and the rest FALSE.  If the system comes with a builtin console terminal,
define all the terminal switches FALSE.  If the system uses an external
terminal as the console, locate the terminal in table @ref<-cpmterms> and
define the appropriate symbol TRUE, and the remainder FALSE.  If the terminal
is not listed in table @ref<-cpmterms>, use the CRT switch; in this case, VT52
emulation is not supported.

In addition, there are a few general and system-@|specific symbols which may
be altered to fit your system:
@begin<description>
APSLOT@\For Apple with 6551 ACIA, defines the slot number of the serial card

CPUSPD@\Processor speed in units of 100KHz (currently used only for bbII and
        kpII for timing loops)

TAC@\For users connecting through ARPAnet TACs: set to TRUE if you wish the
default TACTRAP status to be ON. (This may be overridden with the SET TACTRAP
command).  If you're not connecting through a TAC, set tac to FALSE and ignore
tacval.

TACVAL@\For ARPANET TAC users: defines the default TAC intercept character
(may be overridden with the SET TACTRAP command).
@end<description>

If you are just assembling an existing configuration, you'll need to edit
@Q(CPXTYP.ASM) only.  If you are adding support for a new system, you should
not modify @Q(CPSDEF.ASM) or @Q(CPXLNK.ASM); if you do, you'll have to change
the system-@|independent module also.  Eventually, @Q(CPXSYS.ASM) will be split
into separate files, each of which will generate one or more related systems.
When this happens, you'll want to pick the one closest to your system to use as
a starting point.

After editing @q<CPXTYP.ASM> as necessary, assemble and link the overlay as
follows:
@begin<itemize>
With M80 (where "xxxx" is the hex value of ovladr from @q<CPXLNK.ASM>):
@begin<example>
A>@ux<m80 cpxtyp=cpxtyp.asm>
A>@ux<l80 /p:xxxx,cpxtyp,cpxtyp/n/x/e>
@end<example>

With LASM:
@begin<example>
A>@ux<lasm cpxtyp>
@end<example>
@end<itemize>

With an IBM PC or clone using the Z80MU softwrae, follow the instructions
as if you were using a real CP/M system.

The overlay (@q(CPXTYP.HEX)) may then be merged with the system-@|independent
module as described above (creating a runnable Kermit from the distribution
kit).

If you are using the Z80MU 
development system on a PC, and already have a running
Kermit-80 v3.9 or later, you can merge the two @q<.HEX> files into a @q<.COM>
file with LINK80 (TOPS 10/20), MLOAD (Z80MU), L80 (Z80MU), and 
transfer the new @q<.COM> file to your micro with Kermit:
@begin<itemize>
Z80MU on a PC and MLOAD:
@begin<example>
@@@ux<MLOAD KERNEW=CPSKER,CPXTYP>
@end<example>

Z80MU on a PC and C80:
@begin<example>
@@@ux<L80 /P:xxxx,CPXTYP,CPXTYP/N/X/E>
@end<example>
@end<itemize>
producing @Q(KERNEW.COM).

@begin<table,leftmargin +0,use format>
@tabclear()@tabset(1.5in)
@bar()
@blankspace(1)
@u(Symbol)@\@ux<Terminal description>
crt@\Basic CRT, no cursor positioning
adm3a@\ADM3A Display or lookalike
adm22@\ADM22 Display or lookalike
am230@\Ampro 230
h1500@\Hazeltine 1500
smrtvd@\Netronics Smartvid-80
soroq@\Soroq IQ-120
tvi912@\TVI 912
tvi925@\TVI 925, Freedom 100
vt52@\VT 52 or VT52 emulator such as Heath H19, H29, etc.
vt100@\VT 100 or emulator (most ANSI terminals should work)
wyse@\Wyse 100
@caption<Terminals known to Kermit-80>
@tag<-cpmterms>
@bar()
@end<table>

@section<Adding Support For A New System>
Kermit-80 is built from a common set of source files; the system-@|dependent
module makes heavy use of conditional assembly (this complication will be
removed in future releases).  The system dependencies arise from attempts to
answer some questions:
@begin<enumerate>
@i<What kind of terminal is to be supported?>
@blankspace(1)
For many micros, the console is an integral part of the system, but
others can use an external terminal.  In either case, the commands
to manipulate the screen (position the cursor, erase the screen, etc)
must be defined.

@i<How is the serial line accessed?>
@blankspace(1)
For systems supporting the IOBYTE function, this is straightforward; the
symbol "IOBYT" is defined TRUE.  If the serial line is accessed with IN and OUT
instructions, it may be possible to use the simple I/O routines provided.  In
this case, the symbol "INOUT" is defined TRUE, the MNPORT and MNPRTS are
defined to be the data and control addresses, respectively, and bit masks for
testing for "input data available" and "output buffer empty" must be defined.
If the interface is strange, leave IOBYT and INOUT set to FALSE, and provide
the I/O routines.

@i<What initialization is necessary?>
@blankspace(1)
You may wish to set the baud rate or configure the serial line at
startup.  Examples for a number of devices are present.

@i<What special features are to be supported?>
@blankspace(1)
You may want to provide the capability to select one of several serial lines
with the SET PORT command, or to change the speed of the serial line with the
SET SPEED command.  To do this, you'll need to build a command table, using
the systems already supported as examples.  The ability to send a BREAK signal
is desirable.  Again, examples for several different interfaces (ACIA, SIO,
etc) are present.

@i<Do you want to design an external terminal type?>
@blankspace(1)
There is a jump entry in the overlay file to allow users to add their
own termainl emulator.  If you write the code for such an emulator,
you must load this jump address with the address of your emulator, and
SET TERMINAL EXTERNAL from within Kermit.  All characters will be passed
to this routine during connect mode.
@end<enumerate>

@section<Notes on New Features in Kermit-80 Version 4>

@begin<itemize>
@i(Debugging aids:)
SET DEBUG ON will add two fields to the SEND/RECEIVE display, labelled "Spack"
and "Rpack".  These display the last packet sent and received.  Of course, this
slows down the transfer, especially if the console is an external terminal.
SET DEBUG OFF removes these fields.  The VERSION command displays the name,
edit number, and edit date of several of the modules that make up Kermit.

@index<ARPAnet>@index<TAC> @index<Attention Character>
@index<Intercept Character>
@i(TAC support:) ARPAnet TACs (and many other communication devices such as
terminal concentrators, modems, port contention units, network PADs, etc) use a
printing character (like "@@") as an intercept character, to allow commands to
be issued to the TAC, or modem, etc.  In order to send this character to the
host, it must be typed twice.  The command "SET TAC CHARACTER" to Kermit
enables the "TACtrap" and asks the user to specify the TAC intercept character.
This character will be automatically doubled when it appears in Kermit protocol
messages (sent by the SEND or RECEIVE commands) or when it appears in a file
being sent with the TRANSMIT command.  It is not automatically doubled when
typed by the user in CONNECT mode.  "SET TAC ON" enables the TACtrap but does
not change the TAC intercept character, which is initially "@@".  "SET TAC OFF"
disables the TACtrap.

@i(File buffering:)
Previous versions of Kermit-80 buffered only one sector (128 bytes) at a time
during file transfer operations.  This version buffers 16Kbytes at a time,
reducing the number of times the floppy drive must be spun up and down, and
increasing the effective throughput of the link.  If the disk transfer rate is
too slow, however, the remote Kermit may time out and retransmit packets.  This
will show up on the screen in the "Retries:" field; if this occurs after disk
activity, you may want to increase the timeout value on the remote Kermit, 
SET BUFFER <new value> while in Kermit,or
reassemble Kermit with a smaller value for MAXSEC (in @Q(CPSDEF.ASM))
This buffer is also used by the TRANSMIT command; the log file 
enabled by the LOG command is still written a sector at a time.
@end<itemize>

@Comment<for Assembling Kermit-80)

@section<Specification for Kermit-80 System Dependent Modules>

This section is intended for people wanting to implement their own
versions of Kermit-80 for computers not already defined.

The system independent code communicates to routines for a specific
system through a set of tables.  These tables are defined in
CPXLNK.ASM, and should not be modified between revisions of Kermit.  If
an entry is added or deleted, then the whole of Kermit-80
needs reassembling.  Make sure that the changes to CPXLNK.ASM are
duplicated in CPSUTL.ASM, which has the system independent
equivalent of CPXLNK.ASM.

The following entries/definitions apply to revision 4.09.  There
have been three additional entries since revision 4.05.

The table is split into three sectors; The first section defines 
two byte "words" giving 16 bits of interface data; The second set is a
set of jumps to various functions, and finally the third set
a set of pure data bytes.


@subsection(Interface Data.)

@begin<description, spread 0, indent -8>

@ux<LNKFLG>@\Must be first entry in overlay at overlay address.  Is a two 
byte address giving the size of the linkage table.  This is used to 
check for consistency of overlay's
@blankspace(1)

@ux<ENTSIZE>@\Length of entry table, also used for consistency checking after 
the overlay.  Currently 6
@blankspace(1)

@ux<SYSEDT>@\The address of a dollar-terminated string giving the overlay 
revision level and date.  Points to a string like: 
CPXSYS.ASM(33) 4-JUN-1986$
@blankspace(1)

@ux<FAMILY>@\The address of a dollar-terminated string giving the Family overlay 
revision level and date.  If the system is in CPXSYS.ASM rather than a 
particular Family overlay, it is simply a pointer to $
@end<description>
@blankspace(1)

@subsection(Jump Table.)
This is split into three main sectors-
@blankspace(1)

@begin(enumerate)
Input/Output routines

Screen formatting routines

other system dependent routines
@end<enumerate>


@begin<description, spread 0, indent -14>
@blankspace(1)
@ux<SELMDM>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\selects the modem port.  Most systems do nothing and 
simply return.  HL,DE and BC registers preserved.

@blankspace(1)
@ux<OUTMDM>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Output the character in E register to the communications 
line.  BC,DE,HL registers preserved.

@blankspace(1)
@ux<INPMDM>

@i<Parameters>@\None

@i<Returns>@\Accumulator either 0 or character from comms line if available

@i<Description>@\Check modem for character and if so, return it in A.  
HL,DE,BC registers preserved, flags 
and accumulator lost.

@blankspace(1)
@ux<FLSMDM>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Clear any pending characters in the input buffer from the 
modem.  No registers are preserved.


@blankspace(1)
@ux<SELCON>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Select the console.  This is a null subroutine for most 
systems, but for IOBYTE systems selects the console.

@blankspace(1)
@ux<OUTCON>

@i<Parameters>@\Character in E

@i<Returns>@\None

@i<Description>@\Send the character in E to the console.  Any quirks of 
system responding in an odd manner should be handled.  No 
registers preserved.


@blankspace(1)
@ux<INPCON>

@i<Parameters>@\None

@i<Returns>@\Zero or character in A.

@i<Description>@\Get a character from the console or return a null if 
no character to be read.  No registers are preserved.


@blankspace(1)
@ux<OUTLPT>

@i<Parameters>@\Character in E

@i<Returns>@\None

@i<Description>@\Send the character in E to the printer.  The console is 
selected.  Only DE registers are preserved


@blankspace(1)
@ux<LPTSTAT>

@i<Parameters>@\None

@i<Returns>@\00H or 0FFH in A register

@i<Description>@\Test the printer to see if it is ready to receive a 
character to be printed.  If a 00H is returned then the printer is 
ready to receive a character.


@blankspace(1)
@ux<EXTTER>

@i<Parameters>@\Character to be sent to the user supplied terminal emulator
in the E register

@i<Returns>@\None

@i<Description>@\If the user has supplied a terminal emulator in the overlay
code, EXTTER will be a JMP <non zero address>.  If SET TERMINAL EXTERNAL
has been set, all caharcters will be passed verbatim to this terminal 
emulator.  If there is no external emulator, this code will never be called.
The user should reset terminal conditions on initialisation of both
 the system and before CONNECT.  All registers should be preserved.


@blankspace(1)
@ux<XBDOS>

@i<Parameters>@\Any required for calling BDOS

@i<Returns>@\Any expected from the called BDOS routine

@i<Description>@\This is an alternative entry to BDOS.  This entry will also
check the printer status etc.  For full details see the code for the 
BDOS trap in CPSUTL.ASM.
@blankspace(1)
2b)
@blankspace(1)
@ux<CLRLIN>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Clear the current line on the terminal



@blankspace(1)
@ux<CLRSPC>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Erase the current position (after a backspace)



@blankspace(1)
@ux<DELCHR>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Make delete (7FH) look like a backspace.  Some systems 
do a backspace, space, backspace automatically others have to simulate it

@blankspace(1)
@ux<CLRTOP>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Clear the screen and place the cursor at the top LH corner



@blankspace(1)
@ux<SCREND>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Place the cursor on the line for the Kermit-80 prompt 
after a file transfer.  (Usually line 13)



@blankspace(1)
@ux<SCRERR>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move cursor to the error message field on the 
file transfer format screen



@blankspace(1)
@ux<SCRFLN>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move the cursor to the filename field



@blankspace(1)
@ux<SCRNP>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move the cursor to the packet count field



@blankspace(1)
@ux<SCRNRT>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move cursor to the retry count field



@blankspace(1)
@ux<SCRST>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move cursor to the status field



@blankspace(1)
@ux<RPPOS>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move to the receive packet field (debugging use)



@blankspace(1)
@ux<SPPOS>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Move to the send packet field (for debugging use)
@blankspace(1)
2c)
@blankspace(1)
@ux<SYSINIT>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Initialize the system specific items.  No registers 
are preserved.  Any initialization is done once only when Kermit-80 
is first loaded.



@blankspace(1)
@ux<SYSEXIT>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Program termination.  De-initialize anything 
in preparation for a return to CP/M



@blankspace(1)
@ux<SYSCON>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Initialize anything before entering the connect state.



@blankspace(1)
@ux<SYSCLS>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\System dependent close routine when exiting connect state



@blankspace(1)
@ux<SYSINH>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\Help routine to test for any extensions to the escape menu 
during the connect state.  If a system has any special feature it 
can use during connect mode, then it can be tested as 
<escape-character>xxx.  This entry is a string for printing 
to the console for an <escape-character>?  Often used for 
generating breaks or controlling a modem.



@blankspace(1)
@ux<SYSINT>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\This is a test-and-jump on receipt of an escape 
sequence not understood by Kermit-80.  If the character in A is 
not recognized by your version of Kermit=80, do a rskip



@blankspace(1)
@ux<SYSFLT>

@i<Parameters>@\Character in E

@i<Returns>@\Character in E.  Either a 00H or anything else in A

@i<Description>@\Test the character in E.  If it may not be printed to 
the console, set A to zero.  All other registers preserved.

@\NB <XON>,<XOFF>,<DEL>,<NULL> are always rejected.


@blankspace(1)
@ux<SYSBYE>

@i<Parameters>@\None

@i<Returns>@\None

@i<Description>@\System dependent processing for the BYE command.  (eg hang 
up the phone)



@blankspace(1)
@ux<SYSSPD>

@i<Parameters>@\Value from table in DE

@i<Returns>@\None

@i<Description>@\The system dependent code for baud rate change.  DE 
contains the two byte value from the baud rate table.  This value is 
also stored in "SPEED"



@blankspace(1)
@ux<SYSPRT>

@i<Parameters>@\Value in DE

@i<Returns>@\None

@i<Description>@\The system dependent code for setting the port.  
The parameters are passed in DE, which are obtained from the port tables



@blankspace(1)
@ux<SYSSCR>

@i<Parameters>@\String pointer in DE

@i<Returns>@\None

@i<Description>@\Setup the screen display for file transfer.  The Kermit 
version string is pointed to by DE.  If the terminal is not capable of 
cursor addressing (eg dumb glass TTY) then only the screen is cleared 
and the version string is printed.



@blankspace(1)
@ux<CSRPOS>

@i<Parameters>@\Row number in B, column number in C

@i<Returns>@\None

@i<Description>@\Move the cursor to row B, column C where B=1,C=1 is top 
LH corner of screen.  The routine should first end a "cursor 
position" leading string (up to four characters)  then use the 
parameters given to complete the versions cursor position function



@blankspace(1)
@ux<SYSSPC>

@i<Parameters>@\None

@i<Returns>@\K bytes free in HL

@i<Description>@\Get the amount of free disk space on the selected disk 
drive.  This could be in the system independent code.  Automatically 
detects CP/M V2.2 or V3.0.  No registers saved.



@blankspace(1)
@ux<MOVER>

@i<Parameters>@\Source Pointer in HL

@\Destination Pointer in DE 

@\Byte count in BC

@i<Returns>@\None

@i<Description>@\Move (BC) bytes from (HL) to (DE) Z80 based systems 
do an LDIR, while 8080 systems do it as a loop.  All registers destroyed

@blankspace(1)
@ux<PRTSTR>

@i<Parameters>@\$ terminated string pointed to by DE

@i<Returns>@\None

@i<Description>@\Print the string onto the console.
@blankspace(1)
3)
@blankspace(1)
@tabclear()
@tabset(2 inches, 1.0 inches, 1.0 inches)

@blankspace(1)
@ux<PTTAB>@\WORD@\Points to VT52 equivalent escape sequences.

@blankspace(1)
@ux<SPDTAB>@\WORD@\Address of baud-rate command table, or 0 if table does 
not exist

@blankspace(1)
@ux<SPDHLP>@\WORD@\Address of baud-rate help table, or 0 if SET SPEED 
is not supported.  

@blankspace(1)
@ux<PRTTAB>@\WORD@\Address of port command table or 0 if SET PORT is not supported.

@blankspace(1)
@ux<PRTHLP>@\WORD@\Address of port help table or 0 if SET PORT is not supported

@blankspace(1)
@ux<TIMOUT>@\BYTE@\FUZZY-TIMER.  Set to value suitable to your 
system (depends largely on CPU speed)

@blankspace(1)
@ux<VTFLG>@\BYTE@\VT52 emulation flag.  Set to 0 if terminal
emulates a VT52, 01 if emulation is required, or 0FFH if emulations not
possible (eg for "CRT")

@blankspace(1)
@ux<ESCCHR>@\BYTE@\default escape  character-usually control-] but 
sometimes control-\

@blankspace(1)
@ux<SPEED>@\WORD@\Storage space for baud-rate.  Set to 0FFFFH as baud 
rates are initially unknown.  Note that the STATUS routine only looks at the 
first (least significant) byte.

@blankspace(1)
@ux<PORT>@\WORD@\Storage space for port.  Set to 0FFFFH as ports may 
not be implemented, and is initially unknown

@blankspace(1)
@ux<PRNFLG>@\BYTE@\Printer copy flag-if O no copy.  Anything else => 
copy to printer

@blankspace(1)
@ux<DBGFLG>@\BYTE@\Debugging flag.  If O then no debugging to be done.  
(ie writing of debugging info during a file transfer)

@blankspace(1)
@ux<ECOFLG>@\BYTE@\Local ECHO flag (default is off)

@blankspace(1)
@ux<FLWFLG>@\BYTE@\File warning flag.  If set to 1 will not 
overwrite files already existing on disk with some-named files 
being transferred

@blankspace(1)
@ux<IBMFLG>@\BYTE@\IBM system is the host-assume IBM file transfers etc

@blankspace(1)
@ux<CPMFLG>@\BYTE@\Flag indicating type of CP/M files to be transferred.  
Default setting - DEFAULT

@blankspace(1)
@ux<PARITY>@\BYTE@\Type of parity in use

@\ 0 = Even parity

@\ 3 = Mark parity

@\ 6 = No parity (8th bit is data)

@\ 9 = Odd parity

@\12 = Space parity

@blankspace(1)
@ux<SPSIZ>@\BYTE@\Size of send packet

@blankspace(1)
@ux<RPSIZ>@\BYTE@\Size of receive packet

@blankspace(1)
@ux<STIME>@\BYTE@\Send timer (time-out)

@blankspace(1)
@ux<RTIME>@\BYTE@\Receive timer (time-out)

@blankspace(1)
@ux<SPAD>@\BYTE@\Send Padding (default=0)

@blankspace(1)
@ux<RPAD>@\BYTE@\Receive Padding (default=0)

@blankspace(1)
@ux<SPADCH>@\BYTE@\Send Padding character (default=NULL)

@blankspace(1)
@ux<RPADCH>@\BYTE@\Receive Padding character (default=NULC)

@blankspace(1)
@ux<SEOL>@\BYTE@\Send EOL character (default=CR)

@blankspace(1)
@ux<REOL>@\BYTE@\Receive EOL character (default=CR)

@blankspace(1)
@ux<SQUOTE>@\BYTE@\Send quote character (default=#)

@blankspace(1)
@ux<RQUOTE>@\BYTE@\Receive quote character (default=#)

@blankspace(1)
@ux<CHKTYP>@\BYTE@\Ascii value of checktype

@\31H="1"=checktype1 (6bits)

@\32H="2"=checktype2 (12bits)

@\33H="3"=CCITT checksum (CRC)

@\Default is 31H("1")

@blankspace(1)
@ux<TACFLG>@\BYTE@\If set to on (non zero) send the TACCHR twice.  This is
for ARPA TAC users, where the TAC swallows one "wakeup" character.  If
sent twice the TAC will pas one on and go back to normal mode.

@blankspace(1)
@ux<TACCHR>@\BYTE@\Desired TAC character.  It is ignored if TAC trapping 
is turned off. Value to send twice if TAC interception is set on.  
Default=0, but set to commercial AT if the conditional assembly flag TAC 
is set true

@blankspace(1)
@ux<BUFADR>@\WORD@\Address of Multi-Sector buffering for I/O

@blankspace(1)
@ux<BUFSEC>@\BYTE@\The number of bytes the big buffers can hold.  
Default is 1. (0=256 sectors).

@blankspace(1)
@ux<FFUSSY>@\BYTE@\Indicates if funny characters may be used in CP/M 
file names (eg @q{<>.,;?#[]})  If zero, allow anything.  Default is nonzero.

@blankspace(1)
@ux<BMAX>
@\SPACE:(2bytes) Highest block number on selected disk drive

@blankspace(1)
@ux<BMASK>@\SPACE:(1byte) (Records/block)-1

@blankspace(1)
@ux<BSHIFTF>@\SPACE:(1byte) Number of shifts to multiply by rec.block

@blankspace(1)
@ux<NNAMS>@\SPACE:(1byte) Counter for file-names per line

@end<description>



@section<Future Work>

Work that needs to be done in future releases includes:
@begin<itemize>
Merge in support for additional CP/M-80 systems, particularly those for
which support was recently added to the monolithic v3.x source.

Break up @q<CPXSYS> into discrete source files, one for each system.
These source files should serve as simple models for adding support for
new systems to Kermit-80 -- only the very basic screen definitions, flags,
i/o primitives, initializations, and so forth should appear in each
system-@|dependent file.

Addition of missing features -- compression of repeated characters during
packet transmission, transmission of file attributes (particularly size, so
that "percent done" can be displayed for both incoming and outbound files),
command macros, more advanced login scripts, remote operation and server mode,
etc etc.  Any offers??
@end<itemize>