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I worked for CII-Honeywell Bull in Belgium from 1977 into the ''80s.
I was a uC freak so I was the first to repair most pcb''s of the (CPT) TTX machines in our repair Center in Brussels.
It was a bit tricky, because I did not obtain original schematics.
I did have NO software, apart from the executables pm floppy and in the ROM inside the machine.
Internally it used an inter-pcb bus with extra states ("on top of the normal" 8080 cycles).
After half a year I repaired all the pcb''s in house, reducing turn-around time, stock size and costs for our field engineers.
The display controller generated a (ECL) video signal from a 55MHz dot clock which was fasssst for that time and type of machines.
I have good memories about this machine. It worked nicely. Never got to using the cp/m disks... perhaps the old uC club members within the Bull personnel had more experience with that.

Today, i entered an office, where people are still working with this system (though CPT-branded)!! This is 2007. They store the files on 8" floppy-discs!! Apparently there still is one technician alive in Berlin doing their maintenance.
amazing