> The EEPROMS had a little round window so they could be erased in a UV box before programming.

Nitpick: That'd be a EPROM ("erasable programmable read-only memory"), not EEPROM ("electrically erasable programmable read-only memory"), right?

(But also thanks for the insight; I did wonder a bit as I was reading dmitrygr's article what the other side was of building these)