Subject: [stella] Help--this NOP is KILLING me From: KirkIsrael@xxxxxxxxxxxxx Date: 5 Mar 2004 01:36:25 -0000 |
Tear my hair in frustration, because this is either something so retarded I shouldn't be in the 6507 business AT ALL, or something so subtle... two ASM files: http://alienbill.com/joustpong/working_nop.asm ---works, because I shoved in 3 NOPs around line 2730 http://alienbill.com/joustpong/broken_nop.asm ---doesn't work. I removed one of those 3 NOPs. Works = Pterry seems to fly smoothly and bounces at the right edge Not works = Pterry seems more herkyjerk and shows up on the left before finally switching direction. It is not an inherently time-sensitive piece of code. I don't know if it's: A. some odd memory alignment issue B. some odd timing issue C. one of Kirk's classic screwups, some mysterious missing "#" before a constant or something like that--a quick inspection didn't come up with anythi This is the simplest case I could make for the problem... the clc you see commented out was my first try at fixing it (I thought maybe it was carry problems doing a comparison, and the clc fixed it! apparently by doing what one of the NOPs is doing now.) Thank you, thank you if you can figure out what is up with this. I'm getting really nervous about this deadline I'd *really* like to make... -Kirk -- KirkIsrael@xxxxxxxxxxxxx http://kisrael.com And so I'm leaving / You can find out how much better things can get And if it helps / I'd say I feel a little worse than I did when we met --Dar Williams, "As Cool As I Am" ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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