Re: Playing samples on both new and old SIDs

From: Richard Atkinson (
Date: 2000-07-27 16:21:43

On Thu, 27 Jul 2000, Richard Atkinson wrote:

> But - what I'm curious to know is does anyone know a way to detect between
> 6510 and 8500, or 6569 and 8565? You can't rely on the sound chip being
> 6581 with 6510 / 6569 chips or 8580 with 8500 / 8565 because some people
> replace the 8580s in their C64Cs with 6581s, and some early 64Cs were made
> with 8500s (at least according to the schematic). So does anyone know of
> any differences between the CPU or video chip in NMOS and HMOS processes?
> According to Secret Weapons, something called SMON crashes on an 8500 when
> you use the TRACE command (or something like that), so perhaps there is a
> difference in there somewhere.

Whoops, it was in Knowledge Base and there's a full explanation from
Nicolas about it being due to faulty CIAs not the 8500 or anything else.
Incidentally, Nicolas, is this the 8521 you're referring to? I have a 64C
in which one of the CIAs is an 8521 and the other is a 6526A! So perhaps
Commodore were aware of the bug in the 8521 and used up remaining supplies
somewhere where it wouldn't matter.


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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