Light pen driver
From CPCWiki - THE Amstrad CPC encyclopedia!
; z80dasm 1.2.0
; command line: z80dasm -g0x9c40 -l MCPEN.BIN
org 09c40h
sub_9c40h:
jr $+8
nop
add a,003h
ld de,(la250h)
ld (la248h+1),hl
ld (05a94h),de
ret
or b
ld (bc),a
ld c,b
ld (bc),a
cp (hl)
nop
jr nz,l9c5ah
inc b
l9c5ah:
jr nz,l9c5dh
cp h
l9c5dh:
ld a,(de)
l9c5eh:
inc c
jr z,l9c6eh
nop
nop
ld d,h
or c
add hl,hl
ld bc,020a1h
dec c
nop
nop
ld d,h
or c
l9c6eh:
xor 019h
add hl,de
jr nz,l9c5eh
jr nz,$+15
nop
nop
ld d,h
or c
rst 28h
add hl,de
ld a,(de)
nop
ld b,000h
or d
call 0bd19h ;; mc wait flyback
di
ld bc,0f40eh
out (c),c
ld b,0f6h
in a,(c)
and 030h
ld c,a
or 0c0h
out (c),a
sub_9c94h:
out (c),a
inc b
ld a,092h
out (c),a
push bc
ld bc,0f649h ;; select keyboard line 9 (joystick)
out (c),c
out (c),c
ld b,0f4h
;; loop reading joystick until input seen or timeout
ld hl,0fa66h ;; timeout.
l9ca8h:
in a,(c)
cp 0fdh ;; 11111101. Bits are '1' if 'no press', but '0' if pressed. checking joy 0 down.
jr z,l9cb9h
sub_9caeh:
inc l
jr nz,l9ca8h
inc h
jr nz,l9ca8h
ld hl,0ffffh
jr l9cbdh
l9cb9h:
ld de,00420h
add hl,de
l9cbdh:
ld (0a410h),hl
pop bc
sub_9cc1h:
ld a,082h
out (c),a
dec b
out (c),c
ei
ret
call 09da6h
call sub_9ce4h
call 09db2h
ret
ld a,h
ld c,l
ld b,010h
ld hl,00000h
l9cdbh:
rl c
rla
adc hl,hl
sbc hl,de
jr nc,l9ce5h
sub_9ce4h:
add hl,de
l9ce5h:
ccf
djnz l9cdbh
rl c
rla
ld h,a
ld l,c
ret
ld a,l
ld c,h
ld b,010h
ld hl,00000h
l9cf5h:
srl c
rra
jr nc,l9cfbh
add hl,de
l9cfbh:
ex de,hl
add hl,hl
ex de,hl
djnz l9cf5h
ret
call sub_9c40h
ld a,0ffh
cp h
ret z
ld de,00002h
call sub_9c94h
ld de,00064h
call sub_9caeh
ld de,00084h
call sub_9c94h
ex de,hl
ld hl,0018fh
sbc hl,de
ld (0a410h),hl
ret
ld a,000h
ld bc,01a1ah
call 0bc32h ;; scr set ink
call 0bc14h ;; scr clear
ld a,001h
call 0bbdeh ;; gra set pen
call sub_9cc1h
ld a,0ffh
cp h
ret z
ld de,0000ah
and a
sbc hl,de
jr nc,$+3
ld hl,00000h
ld de,00000h
call 0bbc0h ;; gra move absolute
ld a,001h
ld bc,01a1ah
call 0bc32h ;; scr set ink
ld a,000h
ld bc,00000h
call 0bc32h ;; scr set ink
ld b,00ah
call 0bd19h ;; mc wait flyback
djnz $-4
ld b,020h
l9d65h:
push bc
call 09d35h
call sub_9c40h
pop bc
ld a,0ffh
cp h
jr nz,l9d91h
djnz l9d65h
ret
ld bc,(0a418h)
l9d79h:
push bc
ld de,00000h
ld hl,00014h
call 0bbf9h ;; gra line relative
ld de,(0a416h)
ld hl,0ffech
call 0bbc3h ;; gra move relative
pop bc
djnz l9d79h
ret
l9d91h:
ld de,0ffech
ld hl,00000h
call 0bbc3h ;; gra move relative
l9d9ah:
ld a,000h
call 0bbdeh ;; gra set pen
call 09d35h
ld a,001h
call 0bbdeh ;; gra set pen
ld de,0ffech
ld hl,00000h
call 0bbc3h ;; gra move relative
ld bc,(0a420h)
l9db4h:
push bc
call sub_9cc1h
ld a,0ffh
cp h
jr nz,l9ddah
ld de,00000h
ld hl,00014h
call 0bbf9h ;; gra line relative
ld de,(0a416h)
ld hl,0ffech
call 0bbc3h ;; gra move relative
pop bc
djnz l9db4h
ld hl,0ffffh
ld (0a410h),hl
ret
l9ddah:
pop bc
ld (0a410h),hl
call 0bbc6h ;; gra ask cursor
ld (0a412h),de
ret
sub_9de6h:
ld bc,03fd0h
ld hl,0c000h
ld de,05bfeh
ldir
ret
ld bc,03fd0h
ld hl,05bfeh
ld de,0c000h
ldir
ret
push hl
push de
call 09e08h
ld (0a414h),hl
ld de,05398h
ld b,004h
l9e0bh:
push bc
ld hl,(0a414h)
ld c,b
ld b,000h
inc hl
and a
sbc hl,bc
ld b,00bh
l9e18h:
ld a,(hl)
ld (de),a
inc de
call 0bc29h ;; scr prev line
djnz l9e18h
pop bc
djnz l9e0bh
pop de
pop hl
ret
push hl
push de
ld de,05398h
ld b,004h
l9e2dh:
push bc
ld hl,(0a414h)
ld c,b
ld b,000h
inc hl
and a
sbc hl,bc
ld b,00bh
l9e3ah:
ld a,(de)
ld (hl),a
inc de
call 0bc29h ;; scr prev line
djnz l9e3ah
pop bc
djnz l9e2dh
pop de
pop hl
ret
push de
ld de,00002h
call sub_9c94h
pop de
push hl
ex de,hl
l9e52h:
ld de,(0a416h)
call sub_9c94h
ex de,hl
pop hl
call 0bc1dh ;; scr dot position
ret
call 09c8ah
ld hl,(0a418h)
ld (0a420h),hl
ld hl,(0a410h)
ld a,0ffh
cp h
ret z
ld (0a41ch),hl
ld de,(0a412h)
ld (0a41ah),de
l9e7ah:
ld de,0000ah
and a
sbc hl,de
jr nc,l9e85h
ld hl,00000h
l9e85h:
push hl
ld hl,(0a412h)
add hl,de
ex de,hl
pop hl
call 09dbeh
call 0bbc0h ;; gra move absolute
call 09ed2h
call sub_9de6h
sub_9e98h:
ld hl,(0a410h)
ld a,0ffh
cp h
jr nz,l9ea9h
ld a,02fh
call 0bb1eh ;; km test key
ret z
jp l9e52h
l9ea9h:
call 09eb7h
ld a,02fh
call 0bb1eh ;; km test key
ret z
ld hl,(0a41ch)
ld de,(0a41ah)
call 0bbc0h ;; gra move absolute
ld hl,(0a410h)
ld de,(0a412h)
ld a,(0a41eh)
call 0bbdeh ;; gra set pen
ld (0a41ch),hl
ld (0a41ah),de
call 0bbf6h ;; gra line absolute
ld hl,(0a410h)
jr l9e7ah
ld de,0ffech
ld hl,00000h
call 0bbc3h ;; gra move relative
ld a,001h
call 0bbdeh ;; gra set pen
call 09d35h
ld a,000h
call 0bbdeh ;; gra set pen
call sub_9cc1h
ld a,0ffh
cp h
ret nz
l9ef5h:
pop de
ret
ld hl,(0a41ah)
ld de,(0a412h)
l9efeh:
and a
sbc hl,de
ret z
jp p,09ecbh
ld hl,l9f15h
jp 09eceh
ld hl,09ed2h
l9f0eh:
ld (l9e52h+1),hl
ret
call sub_9e98h
l9f15h:
ld de,0ffech
ld hl,00000h
call 0bbc3h ;; gra move relative
ld bc,(0a420h)
l9f22h:
push bc
ld de,00000h
ld hl,00014h
call 0bbf9h ;; gra line relative
call sub_9cc1h
ld a,0ffh
cp h
jp nz,l9efeh
ld hl,(0a422h)
ld (0a410h),hl
jp l9d9ah
ld (0a422h),hl
ld de,(0a416h)
ld hl,0ffech
call 0bbc3h ;; gra move relative
pop bc
djnz l9f22h
ld hl,0ffffh
ld (0a410h),hl
ret
call sub_9e98h
ld bc,(0a420h)
l9f5ch:
push bc
ld de,00000h
ld hl,00014h
call 0bbf9h ;; gra line relative
call sub_9cc1h
ld a,0ffh
cp h
jp z,l9ef5h
ld (0a422h),hl
ld de,(0a416h)
ld hl,00000h
and a
sbc hl,de
push hl
pop de
ld hl,0ffech
call 0bbc3h ;; gra move relative
pop bc
djnz l9f5ch
ld hl,00000h
ld de,00014h
call 0bbc3h ;; gra move relative
jp l9f0eh
nop
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la050h:
nop
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ld a,013h
ld (la124h),a
ld a,00eh
ld (0a0e2h),a
ld a,(la133h)
bit 1,a
jr z,la083h
ld a,000h
ld (la124h),a
ld a,007h
ld (0a0e2h),a
la083h:
call 0bd28h ;; mc reset printer
ld de,00000h
ld hl,00000h
ld (0a12dh),de
ld a,000h
ld (0a12ch),a
ld de,(0a12dh)
call sub_a10dh
call 0bbf0h ;; gra test absolute
ld de,00001h
call sub_a11dh
ld de,00002h
call sub_a11dh
ld de,00004h
call sub_a11dh
ld de,00008h
call sub_a11dh
ld de,00010h
call sub_a11dh
ld de,00020h
call sub_a11dh
ld de,00040h
call sub_a0ffh
la0c9h:
call 0bd2eh ;; mc busy printer
jr c,la0c9h
call 0bd28h ;; mc reset printer
ld a,01bh
call 0bd2bh ;; mc print char
ld a,04bh
call 0bd2bh ;; mc print char
ld a,000h
call 0bd2bh ;; mc print char
ld a,(la133h)
bit 0,a
jr z,la0f4h
ld a,002h
call 0bd2bh ;; mc print char
ld a,(0a12ch)
call 0bd2bh ;; mc print char
jr la0f9h
la0f4h:
ld a,001h
call 0bd2bh ;; mc print char
la0f9h:
ld a,(0a12ch)
call 0bd2bh ;; mc print char
sub_a0ffh:
call sub_a115h
inc hl
inc hl
call sub_a10dh
ld a,h
cp 001h
jp nz,la050h
sub_a10dh:
ld a,l
cp 090h
jp nz,la050h
ld a,00ah
sub_a115h:
call 0bd2bh
ld a,02fh
call 0bb1eh ;; km test key
sub_a11dh:
ret nz
ld hl,(0a12dh)
ld de,0000eh
la124h:
add hl,de
ld (0a12dh),hl
ld hl,00000h
call sub_a10dh
ld de,(0a12dh)
ld a,d
la133h:
cp 002h
jp nz,la050h
ld a,e
cp 084h
jp nz,la050h
ret
ld b,a
call 0bb99h ;; txt get paper
cp b
ret z
ld hl,(0a12ch)
add hl,de
ld (0a12ch),hl
ret
ld (0a12fh),hl
ld (0a131h),de
ret
ld hl,(0a12fh)
ld de,(0a131h)
ret
call sub_a0ffh
call sub_a115h
inc de
inc de
call sub_a10dh
call 0bbf0h ;; gra test absolute
ret
nop
add a,h
ld (bc),a
nop
nop
ld c,000h
nop
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la18bh:
nop
nop
nop
nop
nop
nop
nop
nop
nop
call 0bc11h ;; scr get mode
cp 000h
jr nz,la19dh
ld b,004h
la19dh:
cp 001h
jr nz,la1a3h
ld b,002h
la1a3h:
cp 002h
jr nz,la1a9h
ld b,001h
la1a9h:
ld a,b
la1aah:
ld (0a254h),a
call 0bbc6h ;; gra ask cursor
ld (la250h),hl
ld (la250h+2),de
la1b7h:
call 0bb99h ;; txt get paper
ld (la1f9h),a
ld bc,00000h
ld (0a24ch),bc
ld (0a24eh),bc
call 0a210h
ld a,02fh
call 0bb1eh ;; km test key
ret nz
ld hl,(0a24eh)
inc hl
inc hl
ld a,004h
cp h
jr nz,la1deh
ld hl,00000h
la1deh:
ld (0a24eh),hl
ld bc,05398h
add hl,bc
ld (la1aah),hl
ld de,(055e0h)
ld hl,(0a24eh)
sub_a1efh:
ld bc,057e4h
add hl,bc
ld (la1b7h),hl
ld hl,(05a2ch)
la1f9h:
ld (la257h),hl
ld (0a255h),de
ld bc,00000h
ld a,(0a254h)
ld c,a
ex de,hl
add hl,bc
ex de,hl
call sub_a1efh
and a
ex de,hl
sbc hl,bc
ex de,hl
call sub_a1efh
inc hl
inc hl
call sub_a1efh
dec hl
dec hl
call sub_a1efh
ld hl,(0a24eh)
ld de,(0a24ch)
inc hl
inc hl
and a
sbc hl,de
ret z
jp la18bh
push de
push hl
push bc
call 0bbf0h ;; gra test absolute
pop bc
pop hl
la237h:
pop de
cp 000h
jr nz,la248h
ld (la250h),hl
ld (la250h+2),de
push bc
call 0a210h
pop bc
la248h:
ld hl,(la257h)
ld de,(0a255h)
ret
la250h:
ld hl,(la250h)
ld de,(la250h+2)
la257h:
call 0bbeah ;; gra plot absolute
ld hl,(0a24ch)
inc hl
inc hl
ld a,004h
cp h
jr nz,la267h
ld hl,00000h
la267h:
ld (0a24ch),hl
ld bc,05398h
add hl,bc
ld de,(la250h+2)
ld (la237h),hl
ld (05648h),de
ld hl,(0a24ch)
ld bc,057e4h
add hl,bc
ld de,(la250h)
ld (la248h+1),hl
ld (05a94h),de
ret
or b
ld (bc),a
ld c,b
ld (bc),a
cp (hl)
nop
jr nz,la295h
inc b
la295h:
jr nz,$+3
cp h
end
