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Atari coding BBS
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Posted by: Mr.Styckx
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Jun,08.2012-23:29
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It can be tricky to compute the expected value of $ff8209 when video counter was changed before.
In that case, the simplest way could be to have your timer b starts, at this point you will be in the right border. Modify $ff8209 to 0 for example to get a fixed starting point on the next line.
Then on the next line you can wait for $ff8209 to change (exit from left border) and apply the usual method to wait a specific number of cycles depending on the value you read in $ff8209.
If changing $ff8209 is not possible because it would mess with your gfx, then the only way is to compute the expected value in $ff8209 on your 8th line by considering you need to add 160*8 to the value in $ff8209 last time you changed the video counter (assuming you don't remove left/right border).
Nicolas
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