Re: LZ: What is wrong with this routine?
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Min Idzelis wrote:
>
> This is a line drawing routine someone gave to me. However, it always
> ends unexpectently, that is, it gives me a TI-Basic ERROR 14
> UNDEFINED, and when i press [F5] QUIT it fills the screen with black
> dots. After you press CLEAR it goes away and everything works again.
> I'll post the ASM test program here: (I'm self teaching code, BTW)
>
> #include "TI-85.H"
>
> .org 0
> .db "test",0
>
> BlackScreen:
> ld hl, $FC00
> ld d, h
> ld e, l
> inc de
> ld (hl), $FF
> ld bc, 1023
> ldir
> test:
> ld c, 30
> ld b, 10
> ld d, 20
>
> HorzLine:
> ROM_CALL(FIND_PIXEL)
> ld b, d
> ld c, a
> ld de, $FC00
> add hl, de
> HRep:
> ld de, 0
> ld a, c
> or (hl)
> ld (hl), a
> ld a, c ; Skip these three lines
> xor (hl) ; if you want to fill
> ld (hl), a ; instead of erase
> rrc c
> adc hl, de
> djnz HRep
> ret
>
> Wait2: ; wait for any key
> call GET_KEY
> cp 0
> jr z, Wait2
> ret
>
> .end
> Computers are like drugs: Highly addictive,
> incredibly expensive, and you keep having to buy more
> and better to remain at the same level of amusement.
you forgot to put in
ld a, 4
out (5),a
I had that same problem before and that is what caused it. also memory
was added to the equation memory.
PCoMP
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