MOS Technology SID
Let the buyer beware
Since 6581 and 8580 SID ICs are no longer produced, they have become highly sought after. In late 2007, various defective remarked SIDs started appearing on eBay as supposedly new chips. All of these remarked SIDs have a defective filter, but some also have defective channels/noise generators, and some are completely dead.
SID chip versions
The first version was the 6581 followed by the 8580, (in the later flat grey Commodore 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.
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.
See also SID sound comparison.
The SwinSID is designed to be a pin compatible replacement module for both versions of the SID IC. Based on the Atmel AVR microcontroller It does not sound exactlty the same as either of the original ICs.
- Remarked SID Chips Sold as New
- Wikipedia:MOS Technology SID
- SID in-depth information page
- Commodore SID 6581 Datasheet
- How to identify C64 and SID model
- Atmel ATmega168 MOS 6581 SID Player
- Interfacing a SID to the ATmega
- MIDIbox SID V2