This is a very long shot but is there any ex GEC Marconi engineers here or anyone who worked on custom military electronics?
I came across a rather interesting box called a GRF control panel which is ex UK Royal Air Force which looks like some video system control panel. It has led readouts for time into mission, frame sequence etc and keys relating to switching video inputs. Going by the keys it looks like this is something to do with the tornado jet. There's no information on the net unsurprisingly.
Anyway it is full of CPLD and EPROM chips used as combinational logic. It all runs off 5v and communicates with a host system over RS232. This just appears to be a keyboard and display assembly but it's outputting a constant stream of data.
I've been unable to make any sense from it and was hoping on the very slim chance someone has seen something similar who can give any information on the communication protocol it uses.
I've an article on my blog with pictures and a link to a YouTube video of a teardown and example of the data stream plus EPROM dumps. It's here if anyone wants to take a look
https://www.adrian-smith31.co.uk/blog/2020/11/oddball-military-hardware-grf-control-panel/It's probably going to be used for parts but if something meaningful can be done with it via the serial port it would make an interesting project.