Changes
fix code style
<pre>
;; Dissassembled and commented from MCPEN.BIN
org 09c40h
call 0bd19h ;; mc wait flyback
di
ld bc,0f40eh;; we want to select AY register 14
out (c),c
ld b,0f6h
and 030h
ld c,a
or 0c0h ;; AY control select register.
out (c),a
out (c),a ;; BUG? No need . Should be out (c),c to do this twicebe compatible with Plus.
inc b
ld a,092h
out (c),a
push bc
ld bc,0f649h ;; AY control read from register and select keyboard line 9 (joystick)
out (c),c
out (c),c ;; BUG? No need to do this twice.
out (c),a
dec b
out (c),c;; Set AY control inactive.
ei
ret
ret
;; HL = HL/DE
sub_9c94:
ld a,h
ld c,l
ld b,010h;; 16 bits.
ld hl,00000h
l9cdbh:
ret
;; HL = HL * DE
sub_9caeh:
ld a,l
ld c,h
ld b,010h;; 16 bits
ld hl,00000h
l9cf5h:
;; detected.
ld de,00002h
call sub_9c94h;; HL = HL/DE
ld de,00064h
call sub_9caeh;; HL = HL*DE
ld de,00084h
call sub_9c94h;; HL = HL/DE
ex de,hl
ld hl,0018fh
call 0bd19h ;; mc wait flyback
;; BUG? this is jumping back to the 0x0a in LD B,0ah
;; djnz $-4
djnz l9d1e
ld b,020h;; number of lines
l9d65h:
push bc
call sub_9d35h;; draw lines
call sub_9c40h ;;detect
pop bc
ret
l9d91h:
ld de,0ffech;; -20
ld hl,00000h
call 0bbc3h ;; gra move relative
ld a,000h
call 0bbdeh ;; gra set pen
call sub_09d35h;; lines
ld a,001h
call 0bbdeh ;; gra set pen
ld de,0ffech;; -20
ld hl,00000h
call 0bbc3h ;; gra move relative
ld a,0ffh
cp h
jr nz,l9ddahsub_9d9ah
ld de,00000h
ld hl,00014h
call 0bbf9h ;; gra line relative
ld de,(0a416h)
ld hl,0ffech;; -20
call 0bbc3h ;; gra move relative
pop bc
ld (0a410h),hl
ret
pop bc
ld (0a410h),hl
push hl
push de
call 09e08hsub_09e08h
ld (0a414h),hl
ld de,05398h
push de
ld de,00002h
call sub_9c94h;; HL = HL/DE
pop de
push hl
ex de,hl
ld de,(0a416h)
call sub_9c94h;; HL = HL/DE
ex de,hl
pop hl
sub_9e1fh:
call 09c8ahsub_9c8ah
ld hl,(0a418h)
ld (0a420h),hl
call sub_09dbeh
call 0bbc0h ;; gra move absolute
sub_9e52h:
call sub_09ed2h
call sub_09de6h
call 0bb1eh ;; km test key
ret z
jp l9e52hsub_9e52h
l9ea9h:
cp h
ret nz
pop de
ret
sub_9eb7h:
ld hl,(0a41ah)
ld de,(0a412h)
and a
sbc hl,de
ret z
jp p,09ecbhl9ecbh
ld hl,l9f15h
jp 09ecehl09eceh l9ecbh: ld hl,09ed2hsub_9ed2hl9f0ehl9eceh:
ld (l9e52h+1),hl
ret
sub_9ed2h:
call sub_9e98h
ld de,0ffech
ld hl,00000h
call 0bbc3h ;; gra move relative
ld bc,(0a420h)
push bc
ld de,00000h
ld a,0ffh
cp h
jp nz,l9efehsub_9efehsub_9ef5h:
ld hl,(0a422h)
ld (0a410h),hl
jp l9d9ahsub_9d9ah sub_9efeh:
ld (0a422h),hl
ld de,(0a416h)
ld (0a410h),hl
ret
sub_9f82h:
call sub_9e98h
ld bc,(0a420h)
ld a,0ffh
cp h
jp z,l9ef5hsub_9ef5h
ld (0a422h),hl
ld de,(0a416h)
call 0bbc3h ;; gra move relative
jp l9f0eh
ld a,013h
ld (la124h0a124h),a
ld a,00eh
ld (0a0e2h),a
ld a,(la133h0a133h)
bit 1,a
jr z,la083h
ld a,000h
ld (la124h0a124h),a
ld a,007h
ld (0a0e2h),a
la083h:
call 0bd28h ;; mc reset printer
ld de,00000h
ld hl,00000h
ld (0a12dh),de
sub_a050h:
ld a,000h
ld (0a12ch),a;; accumulated pixels.
ld de,(0a12dh)
call sub_a10dh;; store current graphics position
call 0bbf0h ;; gra test absolute
ld de,00001h
call sub_a11dh;; get pixel
ld de,00002h
call sub_a11dh;; get pixel
ld de,00004h
call sub_a11dh;; get pixel
ld de,00008h
call sub_a11dh;; get pixel
ld de,00010h
call sub_a11dh;; get pixel
ld de,00020h
call sub_a11dh;; get pixel
ld de,00040h
call sub_a0ffh;; get pixel
la0c9h:
call 0bd2eh ;; mc busy printer
jr c,la0c9h
call 0bd28h ;; mc reset printer
ld a,01bh ;; ESC
call 0bd2bh ;; mc print char
ld a,04bh ;; K
call 0bd2bh ;; mc print char
ld a,000h ;; number of columns low byte
call 0bd2bh ;; mc print char
ld a,(la133h0a133h)
bit 0,a
jr z,la0f4hla0b4h ld a,002h ;; number of columns high byte?
call 0bd2bh ;; mc print char
ld a,(0a12ch);; pixel data
call 0bd2bh ;; mc print char
jr la0f9h
call 0bd2bh ;; mc print char
la0f9h:
ld a,(0a12ch);; pixel data
call 0bd2bh ;; mc print char
call sub_a115h
inc hl
ld a,h
cp 001h
jp nz,la050hsub_a10dh:sub_a050h
ld a,l
cp 090h
jp nz,la050hsub_a050h ld a,00ahsub_a115h: ;; next line call 0bd2bh;; mc print char ld a,02fh ;; 47 - space
call 0bb1eh ;; km test key
ret nz
ld hl,(0a12dh)
ld de,0000eh
add hl,de
ld (0a12dh),hl
ld de,(0a12dh)
ld a,d
cp 002h
jp nz,la050hsub_a050h
ld a,e
cp 084h
jp nz,la050hsub_a050h
ret
;; accumulate pixels
sub_a0ffh:
ld b,a
call 0bb99h ;; txt get paper
cp b ;; was the colour read the same as the paper?
ret z
;; any pixel which is not the same as the paper will be considered foreground
;; and the printer will draw a dot. Any pixel the same as the paper will
;; be considered background and no dot is drawn by the printer.
;; pixel is set to foreground. accumulate it into the pixel data so far
ld hl,(0a12ch)
add hl,de
ld (0a12ch),hl
ret
sub_a10dh:
ld (0a12fh),hl
ld (0a131h),de
ret
sub_a115h:
ld hl,(0a12fh)
ld de,(0a131h)
ret
sub_a11dh: call sub_a0ffh;; accumulate a pixel for printing. call sub_a115h;; get current X/Y graphics position inc de ;; increment X to next pixel accross screen.
inc de
call 0bbf0h ;; gra test absolute
ret
call 0bc11h ;; scr get mode
cp 000h
ld a,b
la1aah:
ld (0a254hdata_a254),a
call 0bbc6h ;; gra ask cursor
ld (la250hdata_a250),hl ld (la250hdata_a250+2),de
la1b7h:
call 0bb99h ;; txt get paper
ld (la1f9h0a1f9h),a
ld bc,00000h
ld (0a24chdata_a24c),bc ld (0a24ehdata_a24e),bc call 0a210hsub_a210 ld a,02fh ;; 47 - space
call 0bb1eh ;; km test key
ret nz
ld hl,(0a24ehdata_a24e)
inc hl
inc hl
ld hl,00000h
la1deh:
ld (0a24ehdata_a24e),hl
ld bc,05398h
add hl,bc
ld (la1aah0a1aah),hl
ld de,(055e0h)
ld hl,(0a24ehdata_a24e)
sub_a1efh:
ld bc,057e4h
add hl,bc
ld (la1b7h0a1b7h),hl
ld hl,(05a2ch)
la1f9h:
ld (la257h),hl
ld (0a255hdata_a255),de
ld bc,00000h
ld a,(0a254hdata_a254)
ld c,a
ex de,hl
dec hl
call sub_a1efh
ld hl,(0a24ehdata_a24e) ld de,(0a24chdata_a24c)
inc hl
inc hl
ret z
jp la18bh
sub_a1efh:
push de
push hl
pop bc
pop hl
pop de
cp 000h
jr nz,la248h
ld (la250hdata_a250),hl ld (la250hdata_a250+2),de
push bc
call 0a210hsub_0a210h
pop bc
la248h:
ld hl,(la257hdata_a257) ld de,(0a255hdata_a255)
ret
call 0bbeah ;; gra plot absolute
ld hl,(0a24chdata_a24c)
inc hl
inc hl
ld hl,00000h
la267h:
ld (0a24chdata_a24c),hl
ld bc,05398h
add hl,bc
ld de,(la250hdata_a250+2) ld (la237h0a237h),hl
ld (05648h),de
ld hl,(0a24chdata_a24c)
ld bc,057e4h
add hl,bc
ld de,(la250hdata_a250) ld (la248h+10a249),hl
ld (05a94h),de
ret
;;Data areadata_a24c: defw 02b0hdata_a24e: defw 0248hdata_a250: defw 0behdata_a252: defw 0120hdata_a254: defb 04hdata_a255: defw 0120hdata_a257: defw 0bch end</pre>
[[Category:Source code]]
