I have MPE/V that ran on my /42. Is that what you're looking for?
SteveRob
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CHM has a Series II, Series III and a model 44. Finding MPE that will
run on these is the problem. There has been talk of a classic 3000
simulator for a while, but I've not been able to find early enough
software releases for the machines with good hardware documentation.
The 4x series machines have a console processor is a HP proprietary
microcontroller unlike those that came out of Fort Collins.