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TOPS-10 bug revisited.

Correction to my previous message:
The fix is only needed, and will only work on CMUA.  On CMUB, the saved PC
is indeed the instruction AFTER the loser.  I will attempt to find out if
the difference is a difference between the level 5 and level 6 DEC monitors
or is a difference in hardware between the KL and KA.  Or perhaps it is
an idiosyncracy of our much-hacked CMU monitor.  Obviously this is where
the bug came from.  I wonder how many other things like this there are.
-- Scott