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Atari coding BBS
| Re: Timer B & D |
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Posted by: RA/pdx
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Nov,21.2010-17:58
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The classic sync scroll/fullscreen demos count time by VBL. I still do so in my own demo engine, but it considers different VBL frequencies like 50/60/74 Hz.
If you only use syncscroll where you need just a few lines of "overscan" it should be possible to use also another timer. Of course this timer will be delayed by some lines but in most cases this should not be a problem.
Before syncing your screen with
.sync
move.b $ffff8209.w,d0
beq.s .sync
not.b d0
lsr.b d0,d0
or opening the upper border you should stop/disable all other interrupts!
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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