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Old 11 March 2020, 11:31   #14
Daedalus
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Join Date: Jun 2009
Location: Dublin, then Glasgow
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Quote:
Originally Posted by nikosidis View Post
It is ONLY in the lower part of screen it seams. It get worse the more the careacters move
Amiga 1200 Blizzard 030
https://imgur.com/a/4Du4BJi
Is the screen double-buffered? It's possible that the blitting isn't getting done quickly enough, which would make sense if it gets worse when more blitting is happening (and might explain why it doesn't happen in WinUAE with its extra speed). If that's the case, the blitting isn't completed by the time the beam / screen redraw reaches where it's taking place, resulting in corruption. Double buffering allows that to happen in the background, and then the entire bitmap can be flipped at once in the vertical blank to avoid corruption.

I'll have to check it out though - I used to play this on my old Atari 800XL as a kid. Good work Bob!
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