Thanks for the idea, Darrel. While looking for a breadboard to try it, I found a PC board labeled "PIC12F675 programmer" It had my name on it but I have no memory of designing or building it. I checked the file date: it was March 2006, so I must have had a problem at that time and searched for a solution. This is the schematic:
I tried one of the bad devices and got an error: "device does not match target device", so I tried a brand new PIC12F675 and only tried to erase it. Still got the error, so I think the Melabs USB programmer has bit the dust.
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