The Home of FPGASID

FPGASID will be available soon!

Meanwhile read the amazing specs... or listen to the latest FPGASID recordings.


The chip MOS6581 also known as the Sound Interface Device (SID) of the Commodore 64 computer is known for it's characteristic sound. Unfortunately, many of these devices produced between 1982 and 1993 reach the end of their life span these days. It is getting harder to get a replacement part. Thus, we need a proper substitute.
And this is what the FPGASID project is all about!
It has been started to overcome with this situation and reaches even higher - it aims for a better SID than any SID has ever been before...

The Mission

  • Create a pin compatible drop-in replacement for the MOS6581 device as well as for its successor, the MOS8580.

The Targets

  • To-the-cycle exact reproduction of all digital parts including sound and envelope generation and paddle readouts.
  • Exact modeling of the analog parts leading to a result that is almost indistinguishable from the original.
  • Making it configurable to easily switch between various SID variants
  • Adding extra features like wavetables, stereo sound, more voices etc while keeping full compatibility.

The Means

  • Use of FPGA technology. It is more suitable than software related emulation.

The Result

  • This is what came out so far:
  • FPGASID will be available in 2018. 


  • Cable Samples Approved Hooray! Finally (after some failing attempts) our cable provider managed to make the correct cable assemblies for us. We have approved them and production has started. Lead time will be ...
    Posted Nov 9, 2018, 1:19 PM by andi6510 The FPGASID Project
  • The Production Story I have added some lines on the FPGASID production to the project details page.
    Posted Oct 22, 2018, 1:39 PM by andi6510 The FPGASID Project
  • New Audio Recordings with the FPGASID The user SID Spieler known from the has made some excelent recordings of well known (and not so well known) SID tunes. All of them are played back ...
    Posted Oct 22, 2018, 12:43 PM by andi6510 The FPGASID Project
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