muckleberryblim Posted June 18, 2010 Report Share Posted June 18, 2010 So the filter on a SID is analog. Great. What about the oscillators? Digital or analog? If analog are they DCO or VCO? I've always assumed they were digital but I've read otherwise... Ta! Quote Link to comment Share on other sites More sharing options...
Wilba Posted June 18, 2010 Report Share Posted June 18, 2010 The oscillators are digital. Frequency is set by a 16-bit register, which is relative to the system clock (standard 1.0 Mhz). The waveforms are then generated by an accumulator, which produces the sawtooth waveform. Some other digital tricks are done to produce the other waveforms. In case you're interested, here's an article with Bob Yannes, creator of the SID: http://www.joogn.de/sid.yannes.html Quote Link to comment Share on other sites More sharing options...
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