mike lies inside himself for hours:

If it were a TDS540, .P would be a non-maskable interrupt.
What that means is anybody's guess.

AIUI, a "non-maskable interrupt" is a hardwired interrupt into the
processor, which can be raised to crash (?) the CPU.

[Side note: I remember seeing some Silicon Graphics machines that had a
NMI button to force a crash. Used for servicing purposes or to make a
system log when something went wrong]

So, something here is making the CPU "crash" because of NMI.



[]s
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