Posted By
Csabo
on 2020-04-07
16:31:13
|  Re: Atic Atac is released
You don't need to switch to NTSC. What Luca was trying to show is how to make the game NTSC compatible (or, at least not outright NTSC incompatible).
The idea is very simple, don't touch the 7th bit ($40) of $FF07. That bit is 1 on NTSC machines and 0 on PAL machines. Directly writing to this bit switches the video mode, which you want to avoid.
So, to elaborate, instead of "LDA#$XX STA$FF07", you should use "LDA$FF07 AND#$40 ORA#$XX STA$FF07".
Edit: the crash is random. I started it up, crashed in about 1 minute, then I figured I'd record it for you... I played for a couple of minutes and no crash. So... You just have to keep trying I guess.
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