The first Arpanet IMPs were based on the Honeywell 316/516 series - which were widely used in process-control/industrial automation systems for a couple of decades. If challenged, I could probably still remember more of the instruction-set of those machines than it's wise to admit. Versions were used as the "Datanet-30/Datanet-355" frontend and "RNP707" remote-concentrator systems connected to GE/Honeywell Multics or GCOS3 mainframes. Ah, how my university memories of operating a Honeywell 6080 and subsequently a stacked 66/DPS300 come flooding back.
(no subject)