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Reverse-engineering of the MOS 6581/8580 SID schematics by Leandro Nini and ttlworks, based on silicon layouts photographed by Michael Huth and revectorized and annotated by Tommi Lempinen
Envelope Overview Envelope Counter Sustain Comparator ADSR registers Counter Logic Exponential Divider LFSR15 counter LFSR5 counter
Analog stage overview 6581 DACs 6581 Opamps 6581 Filter overview 6581 Audio output 8580 DACs 8580 Virtual ground 8580 AC Voltage divider 8580 Opamps 8580 Filter overview
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