Posted By
gerliczer
on 2019-06-15
05:45:44
|  Re: sid card sid frequency
Solder's SID card runs on half the system clock, supports no register reads (AFAIK) and you synchronize access by setting the CPU clock to slow (read TED documentation).
BSZ's card (http://plus4world.powweb.com/hardware/NSTs_Audio_Extension_V2_0) can be programmed to run on half the system clock or C64 clock, supports register reads without tricks and there's still some slight chance that more will be build. It has complete documentation.
Also there is the one made by Scala (http://plus4world.powweb.com/hardware/Scalas_SIDcard). I think this has all documentation, so you may even build one yourself.
There were another cards made by Csory, a Hungarian guy called MotoHacker and probably some others.
Base address is $FD40 for Solder's cards and $FE80 for Csory's (AFAIR). BSZ's supports both.
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