Core volatility

Wai-Sun> I have MM11-DP (16kW parity core) in my /04 which seems to Wai-Sun> have a little problem. Wai-Sun> Several locations which I've checked seems to be losing Wai-Sun> content (core is supposed to be non-volatile). I've been Wai-Sun> debugging custom bootloaders for the past week and it has Wai-Sun> since gone past annoying. It's like 3 locations out of 50 Wai-Sun> that are always reverting back to 000000 after a reboot. Wai-Sun> Perhaps it's the driver logic to these 3 particular cores Wai-Sun> that are not functioning properly? Or is it the cores Wai-Sun> itself? Or a bug in your program is clearing those three words? It seems mighty peculiar for a hardware problem to consistently turn three words to be all zero. (Then again, what was the original contents? Losing one bit is possible -- losing many bits is unlikely.) Given how core works, if you can write it, then read it several times, and it produces the right answers, it is REALLY unlikely that the bits would just go away by themselves after that. I can imagine some "bit rot" mechanisms, though it's a stretch -- but those wouldn't work in nice whole-word patterns. paul