H3nrik V! wrote on 2020-12-06, 07:05:

So the conclusion must be that the 120 was defective?

It seems that was the case. I could fuss with it more but now that I got what I wanted I dont have much interest in troubleshooting that one cpu.

mpe wrote on 2020-12-01, 09:13:

Surprised there even was a P54C version of the P120. I remember when the P120 announced the 0.35 μm process that made it possible was a major part of the press coverage. Despite using the same die area as P54C (and thus the P54CQS). I'd assume they later switched to P54CS and not the other way around.

Has this been cleared up. Are all P120, from first release really P54CS and use the 0.35 process (same process as P200). I'm asking this now as I have a A80502-120 SK086, date is week 18, 1995. This is an early release and first stepping P120. Changing the multiplier from 2 to 2.5 and fsb from 60 to 66 and it works @166mhz. Running dos quake benchmark for 1 hour stable. Booting to real dos and from WinMe. I will try it @200 but need to get a fan for this small heatsink.