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Is it feasible to fabricate new MOS 6581 chips?

• guerrilla 1y ago
  Pretty sure there are a bunch of different types of clones on eBay.
  • _spduchamp 1y ago
    I thought all these were all simulations and not replicas of silicon. I'm talking about something that keeps all the interference flaws and weirdness of the analog synth intact, and every chip being just a little bit unique, like the original.
    • guerrilla 1y ago
      Mmmmm tricky, even replicas aren't usually done in the same exact process.
    • pverheggen 1y ago
      reSID is one of the best simulators, and actually does capture a lot of the quirks of the 6581. Take a look at the source, some of the models are actually based on electrical characteristics (filter.cc and filter.h for example). https://github.com/VICE-Team/svn-mirror/tree/main/vice/src/resid https://github.com/VICE-Team/svn-mirror/tree/main/vice/src/r...
• jandrese 1y ago
  Maybe not, but there are clones of every single chip in a C64 available for sale now. Getting a perfect replacement is tricky because the originals were far from perfect, the sound you got out would vary between batches and many of the older chips have partially degraded in different ways. https://www.c64-wiki.com/wiki/SID_replacement https://www.c64-wiki.com/wiki/SID_replacement
• pverheggen 1y ago
  Fabricating a custom chip costs several million dollars, which is kind of a non-starter for such a niche product. Is it theoretically possible? Maybe, there are high-res die photographs used for reverse engineering and improving simulator accuracy. But I doubt this is accurate enough to fab an exact replica. http://visual6502.org/images/pages/MOS_6581_SID_die_shots.html http://visual6502.org/images/pages/MOS_6581_SID_die_shots.ht...