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Old 16 August 2012, 11:12   #45
StingRay
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Join Date: Dec 2005
Location: Berlin/Joymoney
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Quote:
Originally Posted by hooverphonique View Post
Back in the day I experienced problems with the vbi running at twice the frequency in many demos and games.. In my own code this could be fixed by either moving the vbr to chipram (my utility "Embedder" does this) or clear the intreq bit twice, iirc - is that the sort of thing you're talking about? I never found any documentation on this stuff back then (something like 15 years ago).
Yep, that's exactly what I was talking about. This problem only happens on 68040/60 machines and can be avoided by writing to INTREQ twice. Might also be that just another access to a custom register is enough after writing to INTREQ but I always used the "write to INTREQ twice" approach.
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