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_spduchamp | 4 months ago

Is it feasible to fabricate new MOS 6581 chips?

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pverheggen|4 months 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.ht...

jandrese|4 months 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

guerrilla|4 months ago

Pretty sure there are a bunch of different types of clones on eBay.

_spduchamp|4 months 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.