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The [[MOS Technology]] 6581/8580 or '''SID''' (Sound Interface Device) is the built-in [[Programmable Sound Generator]] chip used in the [http://en.wikipedia.org/wiki/Commodore_64 Commodore 64] and [http://en.wikipedia.org/wiki/Commodore_128 Commodore 128] home computers in the 1980s.<ref name="wsid">Wikipedia:[http://en.wikipedia.org/wiki/MOS_Technology_SID MOS Technology SID]</ref>
== Development ==
The SID was devised by engineer [[Robert Yannes|Robert "Bob" Yannes]], who later co-founded the [[Ensoniq Corporation]].<ref name="wsid" />
== Let the buyer beware ==
Since 6581 and 8580 SID [[IC]]s 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.<ref>[http://kevtris.org/Projects/sid/remarked_sids.html Remarked SID Chips Sold as New]</ref>
== SID chip versions ==
The first version was the 6581 followed by the 8580, (in the later flat grey [https://en.wikipedia.org/wiki/Commodore_64 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.<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" />
''See also [http://sid.kubarth.com/sound_comparison.html SID sound comparison].''
== Hardware emulation ==
The [http://www.swinkels.tvtom.pl/swinsid/ 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.<ref>[http://www.swinkels.tvtom.pl/swinsid/ About SwinSID]</ref>
== References ==
{{reflist}}
== External links ==
* [http://kevtris.org/Projects/sid/remarked_sids.html Remarked SID Chips Sold as New]
* Wikipedia:[http://en.wikipedia.org/wiki/MOS_Technology_SID MOS Technology SID]
* [http://sid.kubarth.com/ SID in-depth information page]
* [http://soundprogramming.net/electronics_reference/manuals/6581datasheet.pdf Commodore SID 6581 Datasheet]
* [http://www.linusakesson.net/chipophone/pages.php Chipophone]
* [http://ilesj.wordpress.com/2010/07/01/how-to-identify-c64-and-sid-model/ How to identify C64 and SID model]
=== Projects ===
* [http://www.ucapps.de/index.html MIDIbox SID V2]
* [http://wiki.forskningsavd.se/index.php/SIDblaster SIDblaster]
* [http://www.hypersynth.com/hypersid.html HyperSID]
* [http://www.mikekohn.net/micro/sid_player.php Atmel ATmega168 MOS 6581 SID Player]
* [http://kaput.retroarchive.org/MIDI.html Interfacing a SID to the ATmega]
=== Modules ===
* [http://busycircuits.com/alm003/ ALM003
[[Category:MOS Technology ICs]]
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