home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
ftp.barnyard.co.uk
/
2015.02.ftp.barnyard.co.uk.tar
/
ftp.barnyard.co.uk
/
cpm
/
walnut-creek-CDROM
/
ENTERPRS
/
CPM
/
UTILS
/
A
/
BIOSR4.ARC
/
CXDISK.ASM
< prev
next >
Wrap
Assembly Source File
|
1987-04-26
|
31KB
|
1,641 lines
; changes made to this module were to remove test for
; disk status line (it is displayed all of the time now), and
; to remove unecessary disk definitions ( only A, B, and C now)
; The virtual drive E: has been removed, and the 40 column disk status
; display has been removed (previously it was always running no matter
; what.
;
; compare with an original copy of CXDISK.ASM if you want to
; find what the changes were
;
; User assumes _ALL_ liability for use of this module. Original
; copyright is still maintained by Commodore
;
;
;
;
; *****************************************
; * *
; * Commodore Disk Controller *
; * Module for CP/M 3.0 BIOS *
; * *
; *****************************************
;
;
;
title 'CXDISK Commodore C-128 Disk Controller 26 April 87'
; CP/M 3 Disk definition macros
maclib cpm3
maclib z80
; C-128 system equates
maclib cxequ
page
; Disk drive dispatching tables for linked BIOS
public cmdsk0,cmdsk1,cmdsk2
; System Control Block variables
extrn @ermde ; BDOS error mode
; Utility routines in standard BIOS
extrn ?wboot ; warm boot vector
extrn ?pmsg ; print message @<HL> up to 00
; saves <BC> & <DE>
extrn ?pdec ; print binary number in <HL> from 0 to 65535
extrn ?pderr ; print BIOS disk error header
extrn ?conin,?cono ; con in and out
extrn ?const ; get console status
extrn ?sctrn ; sector translation routine
extrn @covec
; status line calls
extrn ?save,?recov,?stat
; System function call
extrn ?kyscn
extrn ?fun65
extrn ?bank
extrn ?di$int
public ?dskst
public ?dkmov
extrn ?stat
page
;
; Initialization entry point.
; called for first time initialization.
;
DSEG
init$154X:
xra a
sta fast
lxi h,MFM$table
shld MFM$tbl$ptr
ret
page
;
; This entry is called when a logical drive is about to
; be logged into for the purpose of density and type determination.
; It may adjust the parameters contained in the disk
; parameter header pointed to by <DE>
;
DSEG
;
; if disk type GCR or drive type 1541
; if 1st sector has 'CBM' (1st 3 bytes)
; if last byte = -1 (0FFh)
; set C128 double sided
; else
; set C128 single sided
; endif
; else
; set C64 type
; endif
; else (must be MFM)
; TEST MFM
; endif
;
login$154X:
call get$drv$info ; set the drive to check (DPH$pointer set)
mvi a,vic$test
call ?fun65
mov b,a
ani 0ch
cpi 0ch
jrz GCR$type ; jump if not a 1571
mov a,b
rlc
jrc MFM$type
page
;
;
;
GCR$type:
lhld DPH$pointer
dcx h
mvi m,dsk$c64
lxi d,dpb$c64$cpm ; set DPB to C64
call set$dpb$only
xra a
sta vic$sect ; set track 1 sector 0 (1st sector
inr a ; on the disk)
sta vic$trk
lxi h,@buffer
shld local$DMA ; move DMA pointer to disk buffer
call login$rd
ana a ; read error ?
rnz ; yes, just return
RCALL FR$check$CBM
rnz ; return if not 'CBM'
; A=0FFh if double sided
inr a
lhld DPH$pointer
dcx h ; does not affect flags
mvi m,dsk$c128
lxi d,dpb$c128$SS
jrnz set$dpb$only
lxi d,dpb$c128$DS
page
;
;
;
set$dpb$only:
lxi b,0 ; set sector translation to zero
set$format:
lhld DPH$pointer
mov m,c
inx h
mov m,b ; install sector translation
lxi b,25-1 ; ofset to DPB
dad b ; HL points to DPB now
lxi b,17 ; dpb size
xchg ; move to DPB location
ldir
ret
page
;
; TEST MFM()
; save number bytes/sector
; if double sided
; mark two sided
; endif
; find start and end sector numbers
; scan table of disk for match (if more then 1 match ask user)
;
MFM$type:
mvi c,01100000b
ana c ; A = status(trk1) shifted left 1
push psw ; save in case bad query
push b ; save BC
call get$max$num$B ; used to set the pointer only
mov b,m ; get size, and disk lock flag
inx h
mov a,m
inx h
mov h,m ; get last MFM$mactch$ptr
mov l,a
mov a,b ; get lock flag in A
ani 80h ; lock bit set ?
sta lock$flag ; (save old lock status)
shld last$match ; save last match pointer
jrz not$$locked$entry ; yes, then set same disk type
; set$locked$entry
xra a
sta lock$flag
mvi c,0B0h
lda vic$data ; get sector size info
ana c
mov b,a ; save disk sector size info
xchg ; save HL
lhld DPH$pointer
dcx h
mov a,c
ana m ; get old disk sector size
cmp b ; are they the same?
jrnz not$locked$entry ; no, then unlock disk anyway
xchg ; get last match pointer (in DE)
pop psw ; yes, remove two data elements
pop psw ; ..save on stack
jr set$this$entry
not$locked$entry:
lxi h,MFM$match$tbl ; clear Match table
shld MFM$cur$ptr
lxi d,MFM$match$tbl+1
mvi m,0
lxi b,(MFM$tbl$entries*2)-1+1+1 ; table, offset and count
ldir
mvi a,4
sta vic$trk ; do query on track 4
mvi a,vic$query
call ?fun65
pop b ; recover BC
ani 0eh ; query error ?
jrnz query$error ; yes, use only bits 5 and 6
lda @buffer ; get trk 4 status
mov b,a ; save in B
ani 0eh ; trk 4 status error ?
jrnz query$error ; yes, use only bits 5 and 6
mov a,b ; recover B (trk 4 status)
add a ; shift left
ana c ; mask sector size bits
mov b,a
pop psw ; get trk 1 sector size bits
cmp b ; same as trk 4 sector size?
mvi c,01111111b
jrz trk$1$trk$4 ; yes, (then test for mult format)
mvi a,80h ; set MSB to mean mult format
add b ; ..(track 0 different sector size
; ..then track 4)
mov b,a ; save in B
mvi c,11111111b
trk$1$trk$4:
lda @buffer+1 ; get number of sectors/track
sui 4 ; remove 4 to extend the range
add a ; shift left
add b ; combine with rest of mask
mov b,a ; save in B for now
lda @buffer+3 ; minimum sector number
add b ; add in start sector #
push psw ; save on stack for a moment
query$error:
pop psw ; get value to match
ana c ; test only those bits in the mask
lhld MFM$tbl$ptr
mvi b,MFM$tbl$entries
check$next:
push b ; save BC for a moment
mov b,a ; move compare value to
mov a,m ; get type info
ana c ; test only the good info
cmp b ; match the current type byte
mov a,b ; (recover A)
pop b ; (recover BC)
jrnz not$found ; no, do not queue data
; yes queue table entry address
xchg ; save adr in DE
lhld MFM$cur$ptr
mov m,e
inx h
mov m,d
inx h
shld MFM$cur$ptr
lxi h,MFM$count
inr m ; add one to counter
xchg
page
;
;
not$found:
lxi d,32 ; table entry size
dad d
djnz check$next
lda MFM$count ; number of matches in table
ana a ; test for zero
jz tell$user$no$entry ; none, tell the user
dcr a ; only one ?
jrnz user$select ; no, go check with user (which one)
lhld MFM$match$tbl ; yes, use the only one found
;
; install data form pointer in HL
;
set$this$entry:
push h ; save table pointer
inx h
mov a,m ; get type info.
xchg ; save table address in DE
lhld DPH$pointer
dcx h
mov m,a ; save type code
xchg ; get table adr to HL
inx h ; HL points to sector translation table
mov c,m ; ..zero if none
inx h
mov b,m
inx h ; HL points to DPB
xchg ; DE points to DPB (HL trash)
call set$format
mov b,m ; get the number of sect/trk from MFM table
lda lock$flag ; get the current lock flag value
ora b ; combine with sect/trk
xchg ; HL=to adr, DE=from adr
mov m,a ; install sect/trk and lock flag
pop d ; recover table pointer
inx h
mov m,e
inx h
mov m,d ; save MFM table pointer at end of DPH
ret
page
;
; let the user select the Disk type s/he wants
;
user$select:
inr a ; number of entries to try to match
mov b,a ; set in B as loop count
lhld last$match ; get value to match with
mov d,h
mov e,l ; last match pointer is in DE
lxi h,MFM$match$tbl
shld MFM$cur$ptr
mvi c,0 ; start offset at zero
try$next$format:
mov a,e
cmp m
inx h
jrnz not$last$match
mov a,d
cmp m
jrnz not$last$match
;
; match, set pointer
;
mov a,c ; get offset in A
push psw
call save$dsk$window
pop psw
jr set$offset
not$last$match:
inx h ; each pointer uses two bytes
inr c ; advance the index
djnz try$next$format ; test for more, loop if so
call save$dsk$window
lhld MFM$cur$ptr
user$loop:
mov e,m ; HL=(MFM$cur$ptr)
inx h
mov d,m
lxi h,22 ; offset to NAME field
dad d ; point to Disk name
call dsk$window$old
dsk$user$sel$wait:
call ?kyscn
inr b ; test for key pressed
jrz dsk$user$sel$wait
dcr b ; adjust back
mov a,b ; move matrix position to A
cpi SF$exit
jrnz CK$dsk$user$rt
mov a,c
ani 4 ; control key down ?
jrz no$cntr$key ; no, don't lock this selection
mvi a,80h ; yes, lock disk type to this drive
no$cntr$key:
sta lock$flag ;
call dsk$window$remove
lhld MFM$cur$ptr
mov e,m
inx h
mov d,m
xchg
jr set$this$entry
page
;
;
;
CK$dsk$user$rt:
cpi SF$right ;
jrnz CK$dsk$user$lf
; move window down
lda MFM$count ; get number of items in list
mov b,a ; save in B
lda MFM$offset ; get current position
inr a ; advance position
cmp b ; at last position ? (n-1+1 =count)
jrnz set$offset ; no, then use A as new position
xra a ; yes, move back to start
jr set$offset
CK$dsk$user$lf:
cpi SF$left ;
jrnz dsk$user$sel$wait
; move window up
lda MFM$offset
dcr a ; back up offset (under flow?)
jp set$offset ; result positive, jump
lda MFM$count ; get last item number
dcr a ; pointer is 0 to n-1 (not 1 to n)
set$offset:
sta MFM$offset ; set new list offset
inr a ; add one to adjust for DCR below
lxi h,MFM$match$tbl ; set to the beginning
adjust$dsk$loop:
shld MFM$cur$ptr ; set pointer here !
dcr a ; at offset yet?
jrz user$loop ; yes, go display name
inx h
inx h
jr adjust$dsk$loop
page
;
;
;
tell$user$no$entry:
lda vic$data ; get disk test status
ani 0b0h ; save only sector size and MFM flag
lhld DPH$pointer
dcx h
mov m,a ; set disk size and Type0 (MFM)
lxi h,dsk$window*256+buff$pos
lxi d,no$dsk$msg
disp$msg$DE$HL:
call dsk$window$new
dsk$no$entry$wait:
call ?kyscn
inr b
jrz dsk$no$entry$wait
dcr b
mov a,b
cpi SF$exit
jrnz dsk$no$entry$wait
; jr dsk$window$remove
page
;
;
;
dsk$window$remove:
lhld window$info
mov b,h
mov c,l
jmp ?recov
;
;
;
save$dsk$window:
lxi h,dsk$window*256+buff$pos ; H=size l=pos
shld window$info
mov b,h
mov c,l
jmp ?save
;
;
;
dsk$window$new:
shld window$info
xchg
mov b,d
mov c,e
push h
call ?save
pop h
dsk$window$old:
lda window$info ; get start index
inr a
mov c,a ; place in C
dsk$out$next:
push h
lhld window$info
mov a,h
add l ; compute max index (start+size)
dcr a ; ..less 1
pop h
cmp c
rz
mov b,m
call dsk$B$out
inx h
jr dsk$out$next
;
;
;
dsk$B$out:
mvi a,01000000b ; set reverse video attr
push b
push h
call ?stat ; display space
pop h
pop b ; recover count
inr c
ret
page
;
; disk READ and WRITE entry points.
; These entries are called with the following arguments:
; relative drive number in @rdrv (8 bits)
; absolute drive number in @adrv (8 bits)
; disk transfer address in @dma (16 bits)
; disk transfer bank in @dbnk (8 bits)
; disk track address in @trk (16 bits)
; disk sector address in @sect (16 bits)
; pointer to XDPH in <DE>
;
; return with an error code in <A>
; A=0 no errors
; A=1 non-recoverable error
; A=2 disk write protected
; A=FF media change detected
;
DSEG
read$154X:
call get$drv$info
jm mfm$rd
call set$up$GCR ; compute effective track and sector
login$rd:
lda vic$drv
mov b,a
lda fast ; get fast flags
ana b ; isolate fast bit for this drive
jrnz rd$fast ; go handle fast drive
rd$slow:
mvi a,vicrd ; read a sector of data (A=1)
call dsk$fun ; a=0 if no errors
jnz test$error ; check for disk error or media change
;
;
;
buf$move:
xra a ; set direction to read
call ?dkmov ; go move buffer to DMA
lda sect$cnt
ana a
rz ; a=0 means not read errors
call set$up$next
jr rd$slow
page
;
; A=drive type info
;
mfm$rd:
call set$up$MFM
rd$fast:
mvi a,vic$rd$f
call dsk$fun ; go read the disk
ani 0eh ; mask off error bits
jrnz test$error
call get$sector$size
inr d
inr e ; adjust count for pre-decrement
call ?di$int
lxi b,0DD00h ; D2PRA
inp a ; get current clock polarity
xri 10h ; toggle clk$bit
outp a ; to have status sent (extra clock
; supplied by rd$1571$data for multi
; sector transfers)
lda vic$count
rd$multi$sect:
push psw
push d ; save the sector size
call rd$1571$data ; read disk data to DMA address
pop d
lda vic$data
ani 0eh
jrnz test$error$pop ; A=0 if no errors
pop psw
dcr a
jrnz rd$multi$sect
ei
lda sect$cnt
ana a ; any sectors left to read
jrz done$rd$1571
call set$up$next
jr rd$fast
done$rd$1571:
lxi b,0DD00h ; D2PRA
inp a
ani not(10h) ; set clk$bit hi
outp a
xra a ; A=0 for no errors
ret
page
;
;
;
write$154X:
call get$drv$info
jm mfm$wr
call set$up$GCR
lda vic$drv
mov b,a
lda fast ; get fast flags
ana b ; isolate fast bit for this drive
jrnz wr$fast$drive ; go handle fast drive
wr$slow:
mvi a,-1 ; set direction to write
call ?dkmov ; go move DMA to buffer
mvi a,vicwr ; write a sector of data
call dsk$fun ; a=0 if no errors
ani 0eh
jrnz test$error
lda sect$cnt
ana a
rz
call set$up$next
jr wr$slow
test$error$pop:
pop psw
test$error:
ei
lda vic$data
ani 0fh ; check for disk error or media change
cpi 0bh ; disk change ?
jrz change$error
cpi 08h ; test for write protect error
jrz write$prot$error
mvi a,1 ; get general error flag
ret
;
;
write$prot$error:
mvi a,2
ret
;
;
change$error:
mvi a,-1
ret
page
;
;
;
mfm$wr:
call set$up$MFM
wr$fast$drive:
mvi a,vic$wr$f
call dsk$fun ; go send the write command
call get$sector$size ; setup DMA adr and transfer count
lda vic$count
wr$multi$sect:
push psw
push d ; save sector size
call wr$1571$data ; write data to disk from DMA address
pop d
ani 0eh
jrnz test$error$pop
pop psw
dcr a
jrnz wr$multi$sect
ei
lda sect$cnt
ana a
rz ; return if no errors (A=0)
call set$up$next
jr wr$fast$drive
page
;
;
;
get$drv$info:
lhld @dma
shld local$dma
xchg
shld DPH$pointer
lda @adrv ; get drive number (0 to F)
dcx h ; point at drive mask
dcx h
mov a,m ; get drive mask
mov b,a ; save in B
sta vic$drv ; save vic drive # (values 1,2,4,8)
inx h ; point at disk type
xra a
sta sect$cnt ; clear the count
inr a
sta vic$count
mov a,m ; get disk type
ana a
ret
;
;
;
;
get$max$num$b:
lhld DPH$pointer
lxi b,42 ; offset to number of sectors on track
dad b
mov a,m ; get number sectors/track/side
ani 1fh
mov b,a
ret
;
;
;
get$sector$size:
lhld DPH$pointer
dcx h
mov a,m ; disk type in B (bit 5,4 size info)
rrc ; ..00 = 080h byte sectors
rrc ; ..01 = 100h byte sectors
rrc ; ..10 = 200h byte sectors
rrc ; ..11 = 400h byte sectors
ani 3
jrz set$128
jpo not$3 ; jump if (A=) 01b or 10b
inr a ; make A = 4
not$3:
mvi e,0 ; set E to zero
mov d,a ; set sector size (1,2 or 4)
get$DMA:
lhld local$DMA ; get the current DMA pointer
ret
set$128:
lxi d,128
jr get$DMA
page
;
;
;
DSEG
set$up$GCR:
cpi dsk$c128
jnz tst$c64
mvi a,4
sta sect$cnt
lxi h,sect$buffer
shld sect$buf$ptr
lhld @trk ; 1 K sector pointer
dad h
dad h ; make 256 byte pointer
;
; build a list of tracks and sectors
;
next$sect:
shld @trk
RCALL FR$trk$sect
lhld vic$trk ; get trk(L) and sector(H) to HL
xchg
lhld sect$buf$ptr
mov m,e
inx h
mov m,d
inx h
shld sect$buf$ptr
lhld @trk
inr l ; update saved above at next$sect
mov a,l
ani 3
jrnz next$sect
;
; check list of trk-sectors for number of sectors on this trk
;
lxi h,sect$buffer
shld sect$buf$ptr
lda vic$drv
mov b,a
lda fast
ana b ; drive type 1571
jrz handle$1541 ; no, handle as 1541
lda sect$cnt ; number of sectors to rd/wr
mov b,a
inx h
mov a,m ; get 1st sector #
sta vic$sect
dcx h
mov a,m ; get 1st track #
sta vic$trk
try$next:
cmp m ; test for same trk #
jrnz exit$no$match
inx h
inx h ; advance to next trk
shld sect$buf$ptr
djnz try$next
exit$no$match:
lda sect$cnt ; number of sectors to rd/wr
sub b ; remove number left
; (leaving number matched)
sta vic$count ; save number to read
mov a,b ; get remaining count
sta sect$cnt ; save remaining count
ret
set$up$next:
lda vic$count ; get number of sectors read
lhld local$DMA ; get current DMA pointer
add h ; advance pointer by number of
mov h,a ; sectors read
shld local$DMA
handle$1541:
lhld sect$buf$ptr
mov a,m
sta vic$trk
inx h
mov a,m
sta vic$sect
inx h
shld sect$buf$ptr
lda vic$drv
mov b,a
lda fast
ana b
jrz set$up$next$slow
lda sect$cnt
sta vic$count
xra a ; two reads max with fast drive
jr set$up$next$exit
set$up$next$slow:
lda sect$cnt
dcr a
set$up$next$exit:
sta sect$cnt
ret
tst$c64:
cpi dsk$c64
jrnz tst$none ; compute adjusted track number
;
; this routine will adjust the track number if necessary.
; The C64 CP/M disk has the C64 directory in the center
; of the disk. This routine checks and adds one to the track
; number if we have reached or passed the directory track.
; An additional offset of is added to make the track number
; range from 1 to N+1 instead of 0 to N.
;
set$up$c64:
lda @trk
inr a
cpi dir$track ; carry=1 if A < dir$track
cmc ; add one if dir$track or more (carry not set)
aci 0 ; add the carry bit in
set$up$cont:
sta vic$trk
lda @sect
sta vic$sect
ret
;
; This format is for direct track and sector addressing
;
tst$none:
; cpi dsk$none ; don't test extras for now....??
; rnz
do$type$7:
lda @trk
jr set$up$cont
page
;
; A=dsk$info on entry
;
set$up$MFM:
mvi d,0 ; D=side # (0)
mov e,a ; save dsk$info in E
ani TypeX ; look at Type0 to Type7
jrz do$type$0 ;
cpi Type2
lda @trk ; used by Type1, Type2 and Type3
jrz do$type$2
jrc do$type$1
; cpi Type6
; jrz do$type$6
; jnc do$type$7 ; MSB of sector(byte) set for 2nd side of disk
cpi Type7
jz do$type$7 ; MSB of sector(byte) set for 2nd side of disk
;
; only types 0 to 2 and 7 are currenty defined
; Type3 to Type6 will do Type2
;do$type$3:
;do$type$6:
do$type$2:
mov b,a ; save a copy in B
sui 40
jrc do$type$0 ; jump if still on side 0
mvi a,79 ; on back side count 39,38,37,...,0
sub b
set$trk:
mvi d,80h ; D=side # (1)
sta @trk
jr do$type$0
page
;
; divide the track number by two and if Head=1
; add #sect/side to @sect
;
do$type$1:
cmc ; carry was set clear it
rar ; divide track by 2 (carry gets LSB)
sta @trk
jrnc do$type$0
call get$max$num$b ; HL and C changed
lda @sect
add b
sta @sect
do$type$0:
lda @trk
sta vic$trk
call get$max$num$b ; B=number of sectors per track per side
lda @sect ; ..HL and C changed
cmp b
jrc is$side$0
mvi d,80h ; D=side # (1)
bit C1$bit,e ; dsk$info in E
; sector numbering continues on side 1 ?
jrnz is$side$0 ; yes, do not remove side one bias
sub b ; no, remove side one bias
is$side$0:
mov c,a ; hold @sect in C
mov a,e ; get dsk$info to A
ani S1 ; A=Starting sector number (0 or 1)
add c ; add back @sect
ora d ; add in the side bit
sta vic$sect
ret
page
;
; input:
; DE = number bytes to read
; HL = DMA address
;
CSEG
rd$1571$data:
lda @dbnk ; get the disk DMA bank
call ?bank ; set it
lxi b,0DC0Dh ; D1ICR
rd$1571$stat$wait:
inp a
ani 8 ; data ready bit set?
jrz rd$1571$stat$wait ; no, loop
mvi c,0ch ; D1SDR
inp a ; read the status byte
sta vic$data ; save it
ani 0eh ; any errors ?
jrnz rd$1571$exit ; yes, exit
lxi b,0DD00h
inp a ; get current clock polarity
rd$1571$next:
lxi b,0DD00h ; D2PRA
xri 10h ; toggle clk$bit
outp a ; clock the 1571 for a byte
dcr e ; DE=count
jnz rd$1571$more ; leave as normal jump to keep
dcr d ; the transfer speed at it's max
jrz rd$1571$exit ; ...
;
rd$1571$more:
dcr b
rd$1571$wait:
mvi c,0dh ; D1ICR (DC0Dh)
inp c
bit 3,c
jz rd$1571$wait
mvi c,0ch ; D1SDR
ini ; (hl) <- (bc) ; hl <- hl+1 ; b <- b-1
jmp rd$1571$next
rd$1571$exit:
sta bank$0 ; restore current mem config
ret
page
clk$in equ 40h
;
; input:
; DE = number of bytes to write
; HL = DMA address
;
wr$1571$data:
call ?di$int
; do spout inline
lxi b,mode$reg
mvi a,fast$wr$en
sta io$0
outp a ; set data direction to output
sta bank$0
lxi b,0dc05h ; low (D1T1h)
xra a
outp a
dcr c ; low(D1T1l)
mvi a,3 ; clk = osc/3
outp a ;
mvi c,0eh ; D1CRA
inp a
ani 80h
ori 55h
outp a
dcr c ; D1ICR
inp a
lda @dbnk ; get the disk DMA bank
call ?bank ; set it
mvi a,clk$in
sta cur$clk
page
;
;
clk$wait:
lxi b,0dd00h ; D2PRA
inp a
inp c ; debounce
cmp c
jrnz clk$wait
lda cur$clk ; get old clk value
xra c ; check if changed
ani clk$in ; (only clock in bit)
jrz clk$wait ; loop if not
mov a,c ;
sta cur$clk ; make this the current clk value
lxi b,0dc0ch ; D1SDR
mov a,m
outp a ; send character to drive
inx h ; advance pointer
dcx d ; dec the char count
inr c ; D1ICR
send$wait:
inp a
ani 8
jz send$wait
mov a,d
ora e
jnz clk$wait ; go send the next byte
; do spin
lxi b,0DC0Eh ; D1CRA
inp a
ani 80h
ori 8
outp a
lxi b,mode$reg
mvi a,fast$rd$en
sta io$0 ; enable the MMU
outp a ; set data direction to input
sta bank$0 ; disable MMU
; spin done
page
lxi b,0DC0Dh ; D1ICR
inp a ; clear data pending flag
lxi b,0DD00h ; D2PRA
inp a
ori 10h ; set clk$bit low (hardware inverted)
outp a ;
lxi b,0DC0Dh ; D1ICR
wait$status:
inp a
ani 8
jrz wait$status
lxi b,0DC0Ch ; D1SDR
inp d
lxi b,0DD00h ; D2PRA
inp a
ani not(10h) ; set clk$bit hi (hardware inverted)
outp a ;
mov a,d ; recover the status byte
sta vic$data
ei
ret
page
;
; This routine is used to move a sector of data
; to/from the sector buffer and the DMA pointer.
; A=0 for buffer to DMA (disk read)
; A<>0 for DMA to buffer (disk write)
;
CSEG
?dkmov:
lhld local$DMA ; current DMA adr
lxi d,@buffer ; location of disk read/write buffer
lxi b,256 ; sector size
;
;
dk$cont:
ora a
jrnz dsk$read ; swap pointer for read
xchg
;
;
dsk$read:
lda @dbnk ; get the disk bank
call ?bank
ldir ; do the data move
sta bank$0 ; current bank will ALWAYS be 0
ret
;
;
;
DSEG
dsk$fun:
sta vic$cmd
call disp$dsk$info ; yes, go display disk info
jmp ?fun65+3 ; go do the function
page
;
;*****************************************************************
;
DSEG
?dskst:
disp$dsk$info:
mvi a,72 ; r/w in col 72 (col 0-79)
sta offset
lda vic$cmd
mvi b,'R'
dcr a ; ?1 normal$rd
jrz out$cmd$rd
dcr a ; ?2 normal$wr
jrz out$cmd$wr
dcr a ; ?3 fast$rd
jrz out$cmd$rd
dcr a ; ?4 fast$wr
rnz
out$cmd$wr:
mvi b,'W'
out$cmd$rd:
call disp$B
call disp$space
mvi b,'A'-1
lda vic$drv
next$drv:
inr b
rrc
jrnc next$drv
call disp$B
lda vic$trk
call disp$dec
lda vic$sect
ani 80h
cz disp$space
mvi b,'-'
cnz disp$B
lda vic$sect
ani 7fh
page
;
;
;
disp$dec:
mvi b,'0'-1
conv$loop:
inr b
sui 10
jrnc conv$loop
adi '0'+10
push psw
call disp$B
pop psw
disp$A:
mov b,a
disp$B:
lda offset
mov c,a ; col # in C
inr a
sta offset ; advance cursor position
xra a ; no attribute to write
call ?stat
xra a
ret
disp$space:
mvi b,' '
jr disp$B
page
;*****************************************************************
;
; Extended Disk Parameter Headers (XDPHs)
;
CSEG ; place tables in common
;
; 1st disk drive on the system
;
dw write$154X
dw read$154X
dw login$154X
dw init$154X
db 1 ; bit 0 set (drive 0)
db dsk$c128 ; format type byte
cmdsk0:
dph 0,dpb$0
dpb$0:
dpb 1024,1,1360,2048,128,0
db 0 ; max sector number and lock flag
dw 0 ; MFM table pointer
page
;
; 2nd disk Drive on the system
;
dw write$154X
dw read$154X
dw login$154X
dw init$154X
db 2 ; bit 1 set (drive 1)
db dsk$c128 ; format type byte
cmdsk1:
dph 0,dpb$1
dpb$1:
dpb 1024,1,1360,2048,128,0
db 0 ; max sector number and lock flag
dw 0 ; MFM table pointer
page
;
; 3rd disk drive on the system
;
dw write$154X
dw read$154X
dw login$154X
dw init$154X
db 4 ; bit 2 set (drive 2)
db dsk$c128 ; format type byte
cmdsk2:
dph 0,dpb$2
dpb$2:
dpb 1024,1,1360,2048,128,0
db 0 ; max sector number and lock flag
dw 0 ; MFM table pointer
page
;
; NOTE: The blocking factor for all of these formats is
; 1K (2K for double sided), thus the fractional
; parts are unusable by CP/M. They can be accessed
; by absolute sector addressing.
;
; NOTE: 1571 and 1541 disk drives use track numbers
; of 1 to 35 and sector numbers of 0 to nn
;
; The method used to access the full disk
; is to tell the system that there is 1 sector
; per track and then to use the track # as an
; absolute sector address and do conversion in BIOS.
;
;
; DPB FOR C128 CP/M 3.0 disk ( 170K, 34K larger then C64 CP/M)
; 256 byte sectors ( 170.75K )
; 1 sectors/track
; up to 21 physical sectors (0 to 16,17,18 or 20)
; 680 tracks/disk (usable, 683 real)
; 35 physical tracks (0 to 34)
; 1K allocation blocks
; 64 directory entries
; track offset of 2 (2 sectors) (handled by set$up$c128)
;
DSEG ; these tables are moved to common when used
dpb$c128$SS:
dpb 1024,1,170,1024,64,0
page
;
; DPB FOR C128 CP/M 3.0 double sided disk ( 340K )
; 256 byte sectors ( 341.5K )
; 1 sectors/track
; up to 21 physical sectors (0 to 16,17,18 or 20)
; 1360 tracks/disk (usable, 1366 real)
; 70 physical tracks (0 to 34 side 0, 35 to 69 side 1)
; 2K allocation units
; 128 directory entrys
; track offset of 1 (1 sectors) taken care of in set$up$c128
;
dpb$c128$DS:
dpb 1024,1,340,2048,128,0
page
;
; DPB FOR C64 CP/M 2.2 disk -- ( 136K )
; 256 byte sectors
; 17 sectors / tracks (sector numbering 0-16)
; sector 18 to n on the outer tracks are unused
; 34 tracks / disk
; tracks track 2 to 16 (track numbering 0-34)
; track 17 is the C128 directory track (not counted)
; track 19 to 34
; 1K allocation blocks
; 64 directory entrys
; track offset of 2 (1st two tracks used for CP/M 2.2 boot)
;
dpb$c64$cpm:
dpb 256,17,34,1024,64,2
page
;
DSEG
MFM$table:
db S256*2+(16*2-8)+1 ; 256 byte sect, 16 sect/trk
db MFM+S256+Type0+C0+S1 ; DSDD
dw 0 ; start on track 4 sect 1 (2 alc)
dpb 256,32,40,2048,128,2 ; sect# 1 to 16
db 16 ; (top and bottom numbered the same)
db 'Epson QX10' ;1 Epson QX10
db 80h+S512*2+(10*2-8)+1 ; 512 byte sect, 10 sect/trk
; db S256*2 ; track 0 is 256 bytes/sector
db MFM+S512+Type0+C0+S1 ; DSDD
dw 0 ; start on track 2 sect 1 (2 alc)
dpb 512,20,40,2048,128,2 ; sect# 1 to 10
db 10 ; (top and bottom numbered the same)
db 'Epson QX10' ;2
page
db S512*2+(8*2-8)+1 ; 512 byte sect 8 sect/trk
db MFM+S512+Type2+C0+S1 ; SSDD
dw 0 ; start on track 1 sector 1 (2 alc)
dpb 512,8,40,1024,64,1 ; sect# 1 to 8
db 8 ;
db ' IBM-8 SS ' ;3
db S512*2+(8*2-8)+1 ; 512 byte sect 8 sect/trk
db MFM+S512+Type2+C0+S1 ; DSDD
dw 0 ; start on track 1 sector 1 (1 alc)
dpb 512,8,80,2048,64,1 ; sect# 1 to 8
db 8 ; (top and bottom numbered the same)
db ' IBM-8 DS ' ;4
page
db S512*2+(10*2-8)+0 ; 512 byte sector, 10 sect/trk
db MFM+S512+Type1+C1+S0 ; DSDD
dw 0 ; start on track 0 sector 10 (2 alc)
dpb 512,10,80,2048,128,1 ; sect# 0 to 9 on top (even tracks)
db 10 ; sect# 10 to 19 on bottom (odd tracks)
db 'KayPro IV ' ;5
db S512*2+(10*2-8)+0 ; 512 byte sect, 10 sect/trk
db MFM+S512+Type0+C1+S0 ; SSDD
dw 0 ; start on track 1 sector 0 (4 alc)
dpb 512,10,40,1024,64,1 ; sect# 0 to 9
db 10 ;
db 'KayPro II ' ;6
page
db S1024*2+(5*2-8)+1 ; 1024 byte sect, 5 sect/trk
db MFM+S1024+Type0+C0+S1 ; SSDD
dw 0 ; start on track 3 sector 1 (2 alc)
dpb 1024,5,40,1024,64,3 ; sect# 1 to 5
db 5 ;
db 'Osborne DD' ;7
db S512*2+(9*2-8)+1 ; 512 byte sect 9 sect/track (uses 8)
db MFM+S512+Type1+C0+S1 ; DSDD
dw 0 ; start on trk 0, sect 1, hd 1 (1 alc)
dpb 512,8,80,2048,64,1 ; sect# 1 to 9
db 8 ; (top and bottom numbered the same)
db ' Slicer ' ;8
page
db S256*2+(16*2-8)+1 ; 256 byte sect, 16 sect/trk
db MFM+S256+Type0+C0+S1 ; DSDD
dw 0 ; start on track 4 sect 1 (2 alc)
dpb 256,32,40,2048,128,4 ; sect# 1 to 16
db 16 ; (top and bottom numbered the same)
db 'Epson Euro' ;1 Epson European (MFCP/M ?)
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;10
page
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;11
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;12
page
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;13
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;14
page
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;15
db -1
db MFM ;
dw 0 ;
dpb 512,20,40,2048,128,2 ;
db 8 ;
db ' None ' ;16
page
;
; not functional yet
;
; db S1024*2+(5*2-8)+1 ; 1024 byte sect 5 sect/track
; db MFM+S1024+Type0+C0+S1 ; SSDD
; dw 0 ; start on trk 2, sect 1 (2 alc)
; dpb 1024,5,40,2048,128,2 ; sect# 1 to 5
; db 5 ;
; db 'Morrow MD2' ;
; db S1024*2+(5*2-8)+1 ; 1024 byte sect 5 sect/trk
; db MFM+S1024+Type0+C0+S1 ; DSDD
; dw 0 ; start on trk 1, sect 1, hd 0 (3 alc)
; dpb 1024,10,40,2048,192,1 ; sect# 1 to 5
; db 5 ;
; db 'Morrow MD3' ;
MFM$tbl$entries equ ($-MFM$table)/32
db -1
db -1
page
cseg
cur$clk: ds 1
dseg
lock$flag ds 1
last$match ds 2
window$info: ds 2
dsk$window equ 12
no$dsk$msg:
;1234567890
db ' Missing '
MFM$match$tbl:
ds 2*MFM$tbl$entries ; MFM$count MUST follow this parm
MFM$count:
ds 1 ; MFM$offset MUST follow this parm
MFM$offset:
ds 1
MFM$cur$ptr:
ds 2
DPH$pointer:
ds 2
sect$cnt:
ds 1
sect$buf$ptr:
ds 2
sect$buffer:
ds 4*2
local$DMA:
ds 2
status$atr equ 0
offset: db 0
end
ct$cnt:
ds 1
sect$buf$ptr:
ds 2
sect$buffer:
ds 4*2
local$DMA:
ds 2
status$atr equ 0
offse