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
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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.