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==SID chip versions==
The first version was the 6581 followed by the 8580, (in the later flat grey C64C). The 6582 was sold as replacement for defective 8580s, and sounds very similar. The main difference is the supply voltage and filter caps. The 6581 takes 12V and requires 470pF caps while the 8580 and 6582 take 9V and require 22nF caps.<ref name="um">[http://ucapps.de/midibox_sid_manual_hw.html Hardware Options], User Manual, MIDIbox SID V2</ref>
There are also sound differences. The filter of the 6581 sounds more moody and dirty, while the 8580/6582 filter sounds more precisely. Resonance has nearly no effect on the 6581, some mixed waveforms are not working, and it has a much higher background noise. The 8580/6582 is normally the preferred choice.<ref name="um"/>
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