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.


  • 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
  • FPGA revision 2 binaries available After the first reports from the Alpha testers I prepared a bugfix release to fix the following issues:POTX and POTY had been swapped.Source selection of the EXTIN input ...
    Posted Mar 19, 2017, 4:14 AM by andi6510 The FPGASID Project
  • Alpha Testers have received their devices All participants in the alpha test phase have now received their devices and have started to check the FPGASID functionality. During this phase we will collect all smaller and bigger ...
    Posted Mar 12, 2017, 2:12 PM by andi6510 The FPGASID Project
  • First lot arrived today! Today I received the first lot of FPGASID_proto1 boards from our manufacturer:The first lot! As you can see through-hole parts will still have to be mounted manually ...
    Posted Feb 21, 2017, 11:36 AM by andi6510 The FPGASID Project
  • Finally the first lot of FPGASID_proto1 is being built Before the Christmas holidays I received a first sample of the FPGASID_proto1 boards from our manufacturer. The power-up of this board took quite some time. Maninly caused by ...
    Posted Feb 2, 2017, 12:52 AM by andi6510 The FPGASID Project
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