The FPGASID's Home



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.


  • FPGASID can be purchased in 2018! This is good news!FPGASID will be available for everybody! I have found partners who will take FPGASID into their webshop. We are now busy with the preparations to start ...
    Posted Oct 14, 2017, 1:22 PM by andi6510 The FPGASID Project
  • Another two amazing [videos]! Two further samples of dual FPGASID playing a 3-SID tune:Enjoy!
    Posted Jul 19, 2017, 1:33 PM by andi6510 The FPGASID Project
  • Release 5 available In the download section you'll find release 5 now. This release fixes two problems:In MONO mode The envelope generators are occasionally out-of-sync between both channels.The ...
    Posted Jul 19, 2017, 12:37 PM by andi6510 The FPGASID Project
  • 2 FPGASIDs playing a 3SID tune [video] I recently made an experiment: I added a second FPGASID to my testing machine by using an expansion-port breadboard-PCB. This setup allows me to use 4 SID instances ...
    Posted Jul 10, 2017, 2:48 PM by andi6510 The FPGASID Project
  • Another Interview [video] There is another interview about FPGASID done by in cooperation with Nerds&Geeks. As usual it is in german language (sorry for that) and can be found in ...
    Posted Apr 5, 2017, 12:55 PM by andi6510 The FPGASID Project
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