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lccwrt.src
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lccwrt.src
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.page
.subttl lccwrt
;
; * write job
;
; write out data buffer
wright cmp #$10 ;test if write
beq wrt05
jmp vrfy
wrt05 jsr chkblk ;get block checksum
sta chksum
lda dskcnt ;test for write protect
and #$10
bne wrt10 ;not protected
lda #8 ;write protect error
jmp errr
wrt10 jsr bingcr ;convert buffer to write image
jsr srch ;find header
ldx #gap1-2 ;wait out header gap
wrt20 bvc *
clv
dex ;test if done yet
bne wrt20
lda #$ff ;make output $ff
sta ddra2
lda pcr2 ;set write mode
and #$ff-$e0
ora #$c0
sta pcr2
lda #$ff ;write 5 gcr sync
ldx #numsyn ;
sta data2
clv
wrtsnc bvc *
clv
dex
bne wrtsnc
ldy #256-topwrt ;write out overflow buffer
wrt30 lda ovrbuf,y ;get a char
bvc * ;wait until ready
clv
sta data2 ;stuff it
iny
bne wrt30 ;do next char
;write rest of buffer
wrt40 lda (bufpnt),y ;now do buffer
bvc * ;wait until ready
clv
sta data2 ;stuff it again
iny
;test if done
bne wrt40 ;do the whole thing
bvc * ;wait for last char to write out
lda pcr2 ;goto read mode
ora #$e0
sta pcr2
lda #0 ;make data2 input $00
sta ddra2
jsr wtobin ;convert write image to binary
ldy jobn ;make job a verify
lda jobs,y
eor #$30
sta jobs,y
jmp seak ;scan job que
chkblk lda #0 ;get eor checksum
tay
chkb10 eor (bufpnt),y
iny
bne chkb10
rts ;return checksum in .a
; * wtobin
;
; convert write image back to binary data
wtobin lda #0 ;init pointer
sta savpnt
sta bufpnt ;lsb
sta nxtpnt
lda bufpnt+1 ;goto buffer next
sta nxtbf
lda #>ovrbuf ;use overflow first
sta bufpnt+1
sta savpnt+1
lda #256-topwrt
sta gcrpnt ;get here first
sta bytcnt ;store here
jsr get4gb ;get first four- id and 3 data
lda btab ;save bid
sta bid
ldy bytcnt
lda btab+1
sta (savpnt),y
iny
lda btab+2
sta (savpnt),y
iny
lda btab+3
sta (savpnt),y
iny
sty bytcnt
wtob14 jsr get4gb ;do rest of overflow buffer
ldy bytcnt
lda btab
sta (savpnt),y
iny
lda btab+1
sta (savpnt),y
iny
beq wtob50
lda btab+2
sta (savpnt),y
iny
lda btab+3
sta (savpnt),y
iny
sty bytcnt
bne wtob14 ;jmp
wtob50 lda btab+2
sta (bufpnt),y
iny
lda btab+3
sta (bufpnt),y
iny
sty bytcnt
wtob53 jsr get4gb
ldy bytcnt
lda btab
sta (bufpnt),y
iny
lda btab+1
sta (bufpnt),y
iny
lda btab+2
sta (bufpnt),y
iny
lda btab+3
sta (bufpnt),y
iny
sty bytcnt
cpy #187
bcc wtob53
wtob52 lda #69 ;move buffer up
sta savpnt
lda bufpnt+1
sta savpnt+1
ldy #256-topwrt-1
wtob55 lda (bufpnt),y
sta (savpnt),y
dey
bne wtob55
lda (bufpnt),y
sta (savpnt),y
ldx #256-topwrt ;move overflow over to buffer
wtob57 lda ovrbuf,x
sta (bufpnt),y
iny
inx
bne wtob57
stx gcrflg ;clear buffer gcr flag
rts
; * verify data block
;
; convert to gcr verify image
;
; test against data block
;
; convert back to binary
vrfy cmp #$20 ;test if verify
beq vrf10
jmp sectsk
vrf10 jsr chkblk ;get block checksum
sta chksum
jsr bingcr ;convert to verify image
jsr dstrt
ldy #256-topwrt
vrf15 lda ovrbuf,y ;get char
bvc *
clv
eor data2 ;test if same
bne vrf20 ;verify error
iny
bne vrf15 ;next byte
vrf30 lda (bufpnt),y ;now do buffer
bvc *
clv ;wait for char
eor data2 ;test if same
bne vrf20 ;error
iny
cpy #$fd ;don't test off bytes
bne vrf30
jmp done ;verify ok
vrf20 lda #7 ;verify error
jmp errr
sectsk jsr srch ;sector seek
jmp done
; .end