Another question related to this:
If anyone has an older 'breadbox' c64 (not c64c) with the signetics 82s100 PLA in it (only used for the first year or so before being replaced with the MOS PLA) let me know, I'd like to try to read the fusemap out with an 82s100 programmer. There exists a reverse engineered fusemap of the 82s100, but it was done "by hand" using an eprom programmer to probe all the inputs and look at outputs like a giant truth table, and based on an interview with Bil Herd a few years ago, I now know that this will not produce an accurate dump of the chip, because the engineeres at commodore played some tricks by adding extra/unnecessary gates to certain outputs to intentionally 'slow down' the edges of certain signals to prevent glitches.
Any real risks to the PLA in reading in this fashion?