;
; 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 $3400+bias ;base of cpm ccp
-bdos: equ ccp+$806 ;base of bdos
-bios: equ ccp+$1600 ;base of bios
-cdisk: equ $0004 ;current disk number (0 ... 15)
-iobyte: equ $0003 ;intel iobyte
-buff: equ $0080 ;default buffer address
+ccp: equ 3400h+bias ;base of cpm ccp
+bdos: equ ccp+806h ;base of bdos
+bios: equ ccp+1600h ;base of bios
+cdisk: equ 0004h ;current disk number (0 ... 15)
+iobyte: equ 0003h ;intel iobyte
+buff: equ 0080h ;default buffer address
retry: equ 3 ;max retries on disk i/o before error
cr: equ 13
lf: equ 10
+READ_FUNC: equ 7
+WRITE_FUNC: equ 6
+BOOT_FUNC: equ 5
+HOME_FUNC: equ 4
+
org bios
nsects: equ ($-ccp)/128 ;warm start sector count
db msize/10+'0'
db msize - (msize/10)*10 + '0' ;modulo doesn't work?
db "k cp/m vers 2.2"
- db cr,lf,0
+msgnl: db cr,lf,0
+
+const:
+ in a,(0)
+ ret
+
+conin:
+ in a,(0)
+ cp 0ffh
+ jp nz,conin
+
+ in a,(1)
+ ret
+
+conout:
+ ld a,c
+ out (2),a
+ ret
+
+list:
+ ret
+
+listst:
+ ld a,0
+ ret
+
+punch:
+ ret
+
+reader:
+ ld a,01Fh
+ ret
+
+prmsg:
+ ld a,(hl)
+ or a
+ ret z
+ push hl
+ ld c,a
+ call conout
+ pop hl
+ inc hl
+ jp prmsg
+
+prhex:
+ ld a,c
+ push af
+ rra
+ rra
+ rra
+ rra
+ call prhexdigit
+ pop af
+ ; fall thru
+
+prhexdigit:
+ and 00fh
+ cp 10
+ jp c,prd1
+ add a,7
+prd1:
+ add a,'0'
+ ld c,a
+ jp conout
+
boot:
ld sp,buff
ld hl,signon
call prmsg
+
+ xor a
+ ld (bootdsk),a
+ ld a,(dpb)
+ ld (bootspt),a
+
+ ld c,'I'-'A'
+ call seldsk
+ ld a,h
+ or l
+ jp z,boot1
+
+ ld de,10
+ add hl,de
+ ld e,(hl)
+ inc hl
+ ld d,(hl) ;de = dpb of first ram disk
+
+ ld hl,7
+ add hl,de
+ ld a,(hl) ;get drm
+ inc a
+ and 0fch
+ rrca ;4 dir entries per sector
+ rrca ;Number of sectors to init
+ push af
+
+ ld bc,6
+ add hl,bc
+ ld c,(hl) ;Start track
+ push bc ;Save track
+
+; Check, if we have reserved tracks.
+ ld a,c
+ or a
+ jp z,boot0 ;Skip if not.
+
+; Save CPM to ram disk.
+
+ ld a,(de) ;sectors per track
+ ld (bootspt),a
+ ld a,'I'-'A'
+ ld (bootdsk),a
+ call home
+ ld b,nsects
+ ld c,0 ;track
+ ld d,1 ;sektor (0 based)
+ ld hl,ccp
+store1:
+ push bc
+ push de
+ push hl
+ ld c,d
+ ld b,0
+ call setsec
+ pop bc
+ push bc
+ call setdma
+ ld c,0
+ call write
+
+ pop hl
+ ld de,128
+ add hl,de
+ pop de
+ pop bc
+ dec b
+ jp z,boot0
+
+ inc d
+ ld a,(bootspt)
+ dec a
+ cp d ;if sector >= spt then change tracks
+ jp nc,store1
+
+ ld d,0
+ inc c
+ push bc
+ push de
+ push hl
+ ld b,0
+ call settrk
+ pop hl
+ pop de
+ pop bc
+ jp store1
+
+; Clear directory area of ram disk.
+
+boot0:
+ pop bc
+ call settrk
+ pop af
+ ld d,a ;d = # of sectors
+ ld e,0 ;e = sector
+ push de
+ ld hl,dirbuf ;Clear dirbuf
+ ld c,128
+ ld a,0E5h
+boot_cl:
+ ld (hl),a
+ inc hl
+ dec c
+ jp nz,boot_cl
+
+ ld bc,dirbuf
+ call setdma
+ pop de
+boot_cl2:
+ push de
+ ld c,e
+ ld b,0
+ call setsec
+ ld c,0
+ call write
+ pop de
+ inc e
+ dec d
+ jp nz,boot_cl2
+
+boot1:
xor a
ld (iobyte),a
ld (cdisk),a
wboot: ;re-load CP/M
ld sp,buff
- ld c,0
+ ld a,1<<BOOT_FUNC ;init (de)blocking
+ out (22),a
+ ld a,(bootdsk)
+ ld c,a
call seldsk
call home
ld b,nsects
push de
push hl
ld c,d
+ ld b,0
call setsec
pop bc
push bc
jp z,gocpm
inc d
- ld a,d
- cp 26 ;if sector >= 26 then change tracks
- jp c,load1
+ ld a,(bootspt)
+ dec a
+ cp d ;if sector >= spt then change tracks
+ jp nc,load1
ld d,0
inc c
push bc
push de
push hl
+ ld b,0
call settrk
pop hl
pop de
ld a,(cdisk)
ld c,a
jp ccp
+
+seldsk:
+ ld hl,dphtab
+ ld b,0
+ add hl,bc
+ add hl,bc
+ ld a,(hl) ;get table entry for selected disk
+ inc hl
+ ld h,(hl)
+ ld l,a
+ or h ;no entry, no disk
+ ret z ;
-const:
- in a,(0)
- ret
-
-conin:
- in a,(0)
- cp $ff
- jp nz,conin
-
- in a,(1)
- ret
-
-conout:
- ld a,c
- out (2),a
- ret
-
-list:
- ret
-
-listst:
- ld a,0
- ret
-
-punch:
- ret
-
-reader:
- ld a,$1F
+ ld a,c
+ out (15),a
+ in a,(15) ;querry, if disk exists
+ or a ;0 = disk is ok
+ ret z
+ ld hl,0 ;error return code
ret
home:
- push af
- ld a,0
- out (16),a
- pop af
- ret
-
-seldsk:
- push af
- ld a,c
- cp 0
- jp nz,seldsk_na
- ld hl,dph
- pop af
- ret
-seldsk_na:
- ld hl,0
- pop af
- ret
-
+ ld a,1<<HOME_FUNC
+ out (22),a
+
+ ld bc,0 ; same as seek to track 0
settrk:
- push af
ld a,c
out (16),a
- pop af
+ ld a,b
+ out (17),a
ret
setsec:
- push af
ld a,c
out (18),a
- pop af
ret
setdma:
- push af
ld a,c
out (20),a
ld a,b
out (21),a
- pop af
ret
read:
- ld a,1
+ ld a,1<<READ_FUNC
out (22),a
- ld a,0
+ in a,(22)
+ and 1
ret
write:
- ld a,2
- out (22),a
- ld a,0
+ ld a,c
+ and 3 ;mask write type
+ or 1<<WRITE_FUNC
+ out (22),a
+ in a,(22)
+ and 1
ret
sectran:
;translate sector bc using table at de, res into hl
- ;not implemented :)
ld h,b
ld l,c
+ ld a,d
+ or e
+ ret z
+ ex de,hl
+ add hl,bc
+ ld l,(hl)
+ ld h,0
ret
-prmsg:
- ld a,(hl)
- or a
- ret z
- push hl
- ld c,a
- call conout
- pop hl
- inc hl
- jp prmsg
+dphtab:
+ dw dpe0
+ dw dpe1
+ dw dpe2
+ dw dpe3
+ dw 0
+ dw 0
+ dw 0
+ dw 0
+ dw dperd0
+ dw 0
+ dw 0
+ dw 0
+ dw 0
+ dw 0
+ dw 0
+ dw 0
+
;Disk Parameter Header
-dph:
- dw trans ;XLT: Address of translation table
- dw 0 ;000: Scratchpad
- dw 0 ;000: Scratchpad
- dw 0 ;000: Scratchpad
- dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
- dw dpb ;DPB: Address of a disk parameter block
- dw chk ;CSV: Address of scratchpad area for changed disks
- dw all ;ALV: Address of an allocation info sratchpad
-
-dpb:
- dw 26 ;SPT: sectors per track
- db 3 ;BSH: data allocation block shift factor
- db 7 ;BLM: Data Allocation Mask
- db 0 ;Extent mask
- dw 242 ;DSM: Disk storage capacity
- dw 63 ;DRM, no of directory entries
- db 192 ;AL0
- db 0 ;AL1
- dw 16 ;CKS, size of dir check vector
- dw 2 ;OFF, no of reserved tracks
-
-trans:
- db 0,1,2,3,4,5,6,7,8,9
- db 10,11,12,13,14,15,16,17,18,19
- db 19,20,21,22,23,24,25,26
+dpbase:
+dpe0: dw 0 ;XLT: No sector translation table
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
+ dw dpb ;DPB: Address of a disk parameter block
+ dw chk0 ;CSV: Address of scratchpad area for changed disks
+ dw all0 ;ALV: Address of an allocation info sratchpad
+dpe1: dw 0 ;XLT: No sector translation table
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
+ dw dpb ;DPB: Address of a disk parameter block
+ dw chk1 ;CSV: Address of scratchpad area for changed disks
+ dw all1 ;ALV: Address of an allocation info sratchpad
+dpe2: dw 0 ;XLT: No sector translation table
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
+ dw dpb ;DPB: Address of a disk parameter block
+ dw chk2 ;CSV: Address of scratchpad area for changed disks
+ dw all2 ;ALV: Address of an allocation info sratchpad
+dpe3: dw 0 ;XLT: No sector translation table
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
+ dw dpb ;DPB: Address of a disk parameter block
+ dw chk3 ;CSV: Address of scratchpad area for changed disks
+ dw all3 ;ALV: Address of an allocation info sratchpad
+
+dperd0: dw 0 ;XLT: No sector translation table
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw 0 ;000: Scratchpad
+ dw dirbuf ;DIRBUF: Address of a dirbuff scratchpad
+ dw dpbrd ;DPB: Address of a disk parameter block
+ dw chkrd0 ;CSV: Address of scratchpad area for changed disks
+ dw allrd0 ;ALV: Address of an allocation info sratchpad
+
+
+dpb: dw 26 ;SPT: sectors per track
+ db 3 ;BSH: data allocation block shift factor
+ db 7 ;BLM: Data Allocation Mask
+ db 0 ;Extent mask
+ dw 242 ;DSM: Disk storage capacity
+ dw 63 ;DRM, no of directory entries
+ db 192 ;AL0
+ db 0 ;AL1
+ dw 16 ;CKS, size of dir check vector
+ dw 2 ;OFF, no of reserved tracks
+
+dpbrd: dw 32 ;SPT: sectors per track
+ db 3 ;BSH: data allocation block shift factor
+ db 7 ;BLM: Data Allocation Mask
+ db 0 ;Extent mask
+ dw 55 ;DSM: Disk storage capacity
+ dw 31 ;DRM, no of directory entries
+ db 128 ;AL0
+ db 0 ;AL1
+ dw 0 ;CKS, size of dir check vector
+ dw 2 ;OFF, no of reserved tracks
+
+bootdsk:ds 1
+bootspt:ds 1
dirbuf:
ds 128
-chk:
- ds 16
-
-all:
- ds 31
+chk0: ds 16
+all0: ds 31
+chk1: ds 16
+all1: ds 31
+chk2: ds 16
+all2: ds 31
+chk3: ds 16
+all3: ds 31
+chkrd0: ds 0
+allrd0: ds 7
end
+
projects / avrcpm.git / blobdiff