The Home of FPGASID

FPGASID will be available soon!

Meanwhile read the amazing specs and judge on your own if it is really "The better SID".


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. 


  • Hardware is final - preparation for production starts! This is very good news:Weeks of preparation and extensive testing lie behind me. Now the time has come to release the hardware design to production! This week we will ...
    Posted Jun 24, 2018, 5:23 AM by andi6510 The FPGASID Project
  • The final firmware release before production is out! Firmware revision 9 comes with these changes:Improved audio quality. It fixes occasional idle tones and reduces the plop sound on reset. The 6581 filter curve is now adjustable to ...
    Posted Jun 24, 2018, 5:45 AM by andi6510 The FPGASID Project
  • A word on Protection of (Your!) Personal Data In Europe we have a new legal regulation on data security which became effective end of May. Basically this regulation limits the amount of personal data that can be collected ...
    Posted Jun 24, 2018, 5:42 AM by andi6510 The FPGASID Project
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