> There is a bug in the 6502 when you're using any indirect addressing mode, where the adress is crossing a page, as in:
>
> LDX #$FF
> LDA ($00,X)
>
> Will fetch the low-byte from $00FF and the high-byte from $0000
>
> Basically such code can point anywhere. On the SC it can point somewhere else than on Z26.
Sorry for a delayed response, I just got too busy thinking about that
dreamy David Hasse...er, I mean, got too busy with PhillyClassic. Yeah,
that's it.
Anyway, what are the most reliable ways of detecting this error?
I would guess it usually causes big obvious errors, though that's
just a guess. Is there any kind of DASM macro trickiness that can
find this kind of thing out? I'd like to include a mention of this
in the 2600 Cookbook I'd like to make.
--
KirkIsrael@xxxxxxxxxxxxx http://kisrael.com
Indeed, the Russians' predisposition for quiet reflection followed by
sudden preventive action explains why they led the field for many
years in both chess and ax murders. --Marshall Brickman, Playboy 4/73
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