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_proto1 alive! [video] It was a tough job to power up the first FPGASID_proto1. But now it is done:Another major milestone has been passed!
    Posted Jan 4, 2017, 2:50 AM by andi6510 The FPGASID Project
  • PCA sample arrived Today the first sample PCB with mounted SMD parts was delivered by the manufacturer!The next steps are:Thorough visual inspection of the mounted partsMounting of remaining THT parts ...
    Posted Dec 22, 2016, 3:43 AM by andi6510 The FPGASID Project
  • FPGASID_proto1 PCBs have arrived The PCBs have arrived: Thomas checked them for correctness and found only minor issues. Nothing that would stop the production. He also made a first mechanical compatibility check with some ...
    Posted Nov 30, 2016, 5:12 AM by andi6510 The FPGASID Project
  • Production of FPGASID_proto1 started Yesterday the final production data for our next prototype was sent to the manufacturer. This means that the production is starting today!Here are the latest pictures showing the final ...
    Posted Nov 14, 2016, 12:01 AM by andi6510 The FPGASID Project
  • Alpha Phase Update The alpha test-phase has started with quite some success. Within a few days I found about 15 persons willing to test a FPGASID. Another significant number of people are ...
    Posted Nov 4, 2016, 10:45 AM by andi6510 The FPGASID Project
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