'V-Max secondary checks'
Author:Lord Crass (guest: search)
Date: Sun, Apr 03rd, 2011 @ 03:18 ( . )

I got the sync length to match properly for Bop'N Rumble in the G64 image, which now allows the game to run and pass all protection checks unaltered in Vice. Not sure if this will work remastered due to some timing/density differences. For track 8, all of the syncs need to be:

AF FF FF FF FF FF

The $AF byte should already be there, so just make sure there's 5 $FF bytes after that. The sync check is looking for a return value of $70-$90, and this sequence comes back right in the middle with $80.

I believe this same pattern should work for all of the V-Max V1 and V2 titles that use this sync length check, although most of the others check it on track 12. The only differences I've seen in the check is how strict it is. Some allow a result of $60-$90, most are $70-$90.

I tried this before and was unsuccessful. Not sure why it worked now. Perhaps I was accidentally modifying the wrong track before. Did I mention hex editing g64 and nib files is an error-prone pain?


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