Great post, Trag. I hope you have more time to revisit us, ideally with nifty Mac enhancements ;-)

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Thank you for the kind words. I have no new enhancements in the chute right now. If I ever find the surface of my bench again, I'll finish up my IIfx RAM--I still have boards and chips sitting there, and I have a bunch of 6880 ATA cards to convert to 6880Ms--although for those latter I think I may have procrastinated so long that the market has evaporated out from under me. Still, I got them pretty cheap.

If there is a failure pattern for the 6100 and 7100, it may apply to the 8100, 7200, 8200 etc, clones and PDS accelerators that use the same package. However, I don't consider lifting the heat sink as a trivial maintenance procedure.

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It could apply to any of them, but the 7100 is where i've most commonly seen it. In theory, on a board with a cracked CPU it should be possible to steal a PPC601 from a PM7500/100 daughter card. The biggest problem there is that the PPC601/100 is a 3.3V part and the PPC601/60 - 80 is a 5V part. The supply voltage is easy enough to change (Apple used an adjustable voltage regulator) but I'm not sure the I/O levels are compatible.