If you're talking about ultraviolet-erasable programmable read only memory, that's EPROM. EEPROM is electronically-erasable programmable read only memory, which I believe was pioneered by General Instrument in the early 80s. As to programmers, my college had none at the time. Clever classmates made their own: a box of toggle switches for address & data, all the required power supplies and a one-shot timer for the programming pulse. Very tedious, no read-back or verify. Circuit Cellar, Popular Electronics, BYTE, Nuts and Volts were the hobbyist periodicals of the day. They had advertisements for the low-end programmers (parallel port, ISA bus) and medium price "economy" programmers. ProLog made the high end gang programmers that handled several at once. Steve Ciarcia's Circuit Cellar published build-your-own EPROM programmer kits. UV EPROM erasers are easy to get as germicidal lamps, still sold for Covid precautions. -- jeff jonas