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Atari coding BBS
| Re: clear pixel |
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Posted by: leonard
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Nov,16.2013-11:49
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you're right, fullscreen is a bit different. In a fullscreen dot demo (I think it's the reset demo of 20 years atari celebration), I use that trick, only 4 cycles added:
;drawing routine, the screen offset if stored in D0.W
or.w d1,d0 ; XOR #$8000, transform unsigned value to signed value
move.w d0,n(a1) ; patch clearing instruction
;clear
move.w d0,n(a1) ; offset is signed now, just add 32768 to your screen ad, and it works
total is 28 cycles instead of 24cyles
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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clear pixel
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gloky
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Oct,20.2013-11:44
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Re: clear pixel
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specter
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Oct,24.2013-04:19
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Re: clear pixel
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evil
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Oct,24.2013-16:58
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Re: clear pixel
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nerve
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Oct,25.2013-18:18
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Re: clear pixel
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gwEm
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Oct,27.2013-22:57
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Re: clear pixel
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gloky
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Nov,05.2013-09:29
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Re: clear pixel
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Leonard
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Nov,13.2013-02:30
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Re: clear pixel
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gloky
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Nov,16.2013-12:54
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Re: clear pixel
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gloky
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Nov,27.2013-00:44
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Re: clear pixel
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RA/pdx
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Nov,13.2013-10:27
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Re: clear pixel
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leonard
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Nov,14.2013-01:15
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Re: clear pixel
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RA/pdx
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Nov,14.2013-10:01
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Re: clear pixel
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leonard
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Nov,16.2013-11:49
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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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