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 -- Richard Atkinson Software Engineer Tenison Technology EDA Ltd http://www.tenisontech.com/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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