Posted By
TLC
on 2004-12-22
07:17:59
|  Re: PAL vs. NTSC question?
Yep, and there's something more to consider... It's been a common programming practice to write TED registers directly (I mean, you'd use LDA #$18 / STA $FF07 to turn multicolor mode on, instead of the more correct form of LDA $FF07 / ORA #$10 / STA $FF07). Nobody argued about that, since everyone have been using PAL Plus/4's. If someone such these programs on an NTSC machine, he'd have noticed that they switch the NTSC machine to PAL mode. ...No, you won't get a standard PAL picture on the screen, since the crystals needed for the two modes are different; you'd get a "slow", nonstandard videosignal instead, with which no displays are compatible.
So, I suggest something like this: the sw you tried turns the NTSC machine to PAL mode accidentally. If it's a serious problem (not just skipping an intro or so), then it'd need some patching to work with NTSC machines. You'd have to patch (at least) the $ff07 accesses in the code.
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