Re: A89: Re: Re: Addressing
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Re: A89: Re: Re: Addressing
> Taking the advice of Johan, I changed the mulu.l to mulu.w. That caused a
> lovely crash complete with grayscale static. (Which I suppose was better
> than a blank screen and an address error.) I then tried the optimized code
> he was kind enough to include. It caused the same lovely crash. Any ideas?
>
> choose:
> ; in: d0.w=x
> ; d1.w=y
> ; d2.w=picture number (0=first)
> ;
> lea Pic0(pc),a0
> lsl.w #3,d2
> add.w d2,a0
> add.w d2,d2
> add.w d2,a0
> moveq #-1,d3
> move.l graphlib::plane0,a1
> lea graphlib::put_sprite_mask,a2
> jsr (a2)
> lea 12(a0),a0
> move.l graphlib::plane1,a1
> jmp (a2)
Just curious: do you use the registers you modify in this routine later on?
Like, do you use d2 in a loop, or a0?
Also, is the greyscale initialized correcly? Have you set it to use a1 as your
plane pointer?
The static _might_ be caused by not clearing the screen. Just an idea.
/ Niklas Brunlid
Check out Prosit for the TI-89 / TI-92+ at http://prosit.ticalc.org
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