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RE: Technology series: Revolution of the Processor
Great info! Some of the Electron Microscopes I service have 8086 based computers. I even work on older ones that do not have processors at all, and use a few 1702 or 2718 EPROMs to store their electron optic alignment programs. I found a loose 1702 recently and tested it, and it still worked. I did a little write up of it here, on STEEMIT 1702 EPROM
It's an antic piece May be the chip you found belongs to 1971 or mid 70s. It was use to boot the early microcomputers.
It stored the code for a digital readout, and presets for electromagnetic lens currents. The Electron Microscopes that used them did not have processors.