2 May
2016
2 May
'16
2:42 a.m.
One possibility I have in mind is it's something peculiar about DRAM.
As you may have been aware DROM code isn't run directly, it's loaded by
SROM into DRAM. If it fails a specific bit pattern at a specific location
some reason, then you might see symptoms like these. So shuffling DRAM
modules might change something here.
I will give this a go, but it seems unlikely as the machine is able to run
VMS, and I assume it must be passing at least some basic memory tests.