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Atari coding BBS
| Re: Sid Sound |
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Posted by: Defjam
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Jun,14.2007-00:03
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The 20th Anniversary reset-screen uses
"software calculated SID-sound", that means the 2nd square wave is calculated in software - emulating the square wave produced by the timer interrupt.
The max. frequency is 15650 Hz (each scanline)
some code snippet:
; d0 ... increment (frequency)
; d1 ... counter
; d2 ... volume (hi/lo)
; a0 ... $ff8800
add.w d0,d1
bcc.s no_toogle
swap d2
no_toogle:
movep.w d2,0(a0)
Some years ago I made a SSD replayer (3 sidvoices) in fullscreen, using the same technique - but unfortunately not released yet. :(
But.. I think I was the first one to do such kind of code. :)
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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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Sid Sound
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Bod/STAX
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May,10.2007-16:12
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Re: Sid Sound
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gwEm
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May,10.2007-19:30
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Re: Sid Sound
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Bod/STAX
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May,11.2007-20:29
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Re: Sid Sound
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gwem
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May,13.2007-14:45
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Re: Sid Sound
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Grazey
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May,30.2007-20:15
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Re: Sid Sound
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Bod/STAX
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Jun,01.2007-18:44
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Re: Sid Sound
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Grazey
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Jun,03.2007-16:27
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Re: Sid Sound
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Defjam
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Jun,14.2007-00:03
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Re: Sid Sound
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gwem
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Jun,14.2007-20:41
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Re: Sid Sound
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Bod/STAX
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Jun,14.2007-22:49
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Re: Sid Sound
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gwEm
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Jun,15.2007-00:03
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Re: Sid Sound
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Grazey
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Jun,15.2007-19:18
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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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