Sound quality

  • High quality precision filter capacitors
  • Stereo output terminals for dedicated high-fidelity output (available in all operating modes)
  • Sample playback fix for 8580 with configurable boost level and manual/automatic operating mode
  • Reduced audible noise due to individual voltage filtering and regulation for each SID
  • Configurable external audio input mute function for reduced noise
  • Replaces incorrect filter capacitors found in SX-64 and early C64 models

Voltage control

  • Generates safe and precise operating voltages for each SID
  • Protects SID input and output against over/under voltage and short circuit

Easy usage

  • Automatic SID model detection - any combination of 6581/8580 is supported
  • Manual on-the-fly switching between 6581 (old SID) and 8580 (new SID) - while the tunes/games/demos are playing!
  • Software selectable SID, allowing music player software to automatically select correct SID model
  • Stereo SID capable with second SID at either address $D420, $D5001 or $DE00
  • Also works with single SID if you just want to use old SID in new C64 or new SID in old C64

1) $D500 location is not possible on C128 models due to a slightly incompatible memory map


  • 4 detachable feature cables for easier installation and less clutter
  • Two lengths, you pick the length when ordering. Fits all variants of Commodore 64 and 128

Optional extra buy:

  • The SIDFX adapter, our custom designed adapter that enables the SIDFX unit to fit into the ZIF sockets of a Reloaded motherboard while being mounted in a C64C chassis

We are now fully sold out!

All the SIDFX units from the first manufacturing batch have now been sold. Thanks to everyone who supported us!

Due to the large interest and kind feedback we have decided to open a wishlist. If we get sufficient signups we will strongly consider manufacturing another smaller batch of SIDFX units.

Did you miss out on SIDFX or do you wish another unit? Then please go to the wishlist and sign yourself up. We will keep you up-to-date on any development on a regular basis.