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Atari coding BBS
| Re: Polling V/H retrace status |
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Posted by: ggn
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Jul,01.2014-08:11
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I can't remember any hardware registers like that (unless there's undocumented stuff somewhere)... The only thing that comes to mind isn't particularly clever but it might work: Check the video address pointer ($ff8205/7/9) to see if it's incrementing, otherwise you're into H or V retrace.
(well that's not exactly true, it means that you're not in the visible area, not that you're into horizontal or vertical blank.)
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