;    Configuration and common defs for avrcpm BIOS and IPL

;    Copyright (C) 2010 Leo C.
;
;    This program is free software: you can redistribute it and/or modify
;    it under the terms of the GNU General Public License as published by
;    the Free Software Foundation, either version 3 of the License, or
;    (at your option) any later version.
;
;    This program is distributed in the hope that it will be useful,
;    but WITHOUT ANY WARRANTY; without even the implied warranty of
;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;    GNU General Public License for more details.
;
;    You should have received a copy of the GNU General Public License
;    along with this program.  If not, see <http://www.gnu.org/licenses/>.
;
;    $Id:$
;

msize 	equ	62	;size of available RAM in k

bias 	equ	(msize-20) * 1024 
ccp 	equ	3400h+bias	;base of cpm ccp
bdos 	equ	ccp+806h	;base of bdos
bios 	equ	ccp+1600h	;base of bios
cdisk 	equ	0004h		;current disk number (0 ... 15)
iobyte 	equ	0003h		;intel iobyte
buff 	equ	0080h		;default buffer address
retry 	equ	3		;max retries on disk i/o before error


;copy from avr/virt_ports.asm:
;   Port        Direction  Function
;hex	dez
;-------------------------------------------------------------------------
;00  	0 	in	- Con status. 
;			  Returns 0xFF if the UART has a byte, 0 otherwise.
;01  	1 	in/out	- Console input, aka UDR. / Console Output
;02  	2 	out	- Console Output (deprecated)
;03  	3	in	- "UART" status: bit 0 = rx, bit 1 = tx
;04  	4	in	- "UART" data register, no wait
;
;------------------------ Virtual I2C interface --------------------------
;05	5	out	- Control Port: 1 = Start read operation
;					2 = Start write operation 
;05	5	in	- Status of last Transfer: 0 = ok, else fail
;06	6	in/out	- Number of bytes to transfer, including Slave address
;07,08	7,8	in/out	- Read/Write address low/high
;
;------------------------ Disk I/O ---------------------------------------
;0D,0E	13,14	in/out	- Set address of Bios Controll Block
;0F  	15	in/out	- Disk select
;10,11  16,17 	in/out	- Track select
;12,13 	18,19 	in/out	- Sector select
;14,15 	20,21 	in/out	- Write addr
;   	 	
;16  	22 	out	- Trigger disk i/o operations
;			  Bit 7 = 1: Read sector
;			  Bit 6 = 1: Write sector
;			  Bit 5 = 1: BIOS WBOOT
;			  Bit 4 = 1: BIOS Home
;			  Only one of bits 4..7  may be set.
;			  If Write function (bit 6=1):
;			   Bits 0..2: 0 - write to allocated
;				      1 - write to directory
;				      2 - write unallocated
;				      3 - write to directory			 
;
;16  	22	in	- Result of last read/write operation.
;			  0x00 = ok, 0xff = error (--> Bad Sector)
;
;
;
;------------------------ Wall Clock and Timers --------------------------
;40  	64-71	in/out	- Timer/Clock control.	
;41-46
;
;47-4D		clock	- BCD format: ss, mm, hh,  DD, MM, YYl, YYh
;
;------------------------ Ports ------------------------------------------
;80-87		in/out	- Port-Expander PCF8574 (max. 8 Chips)
;88-8F		in/out	- Port-Expander PCF8574A (not implemented yet!)


READ_FUNC   equ	7
WRITE_FUNC  equ	6
BOOT_FUNC   equ 5
HOME_FUNC   equ 4

TIMERCTL	equ	040h
TIMER_MSECS	equ	TIMERCTL+1
TIMER_SECS	equ	TIMER_MSECS+2
starttimercmd	equ	1
quitTimerCmd	equ	2
printTimerCmd	equ	15
uptimeCmd	equ	16

CLOCKPORT	equ	TIMERCTL+7

DEBUGPORT	equ	04FH
StartTraceCmd	equ	1
StopTraceCmd	equ	0