Correct George, they are OTP parts. I was just pointing out that the chip inside was actually an EPROM, but they put them in the cheap plastic body. It was very common back in the days that EPROM memory was common, you'd develop with the EPROM so you could reuse them, and then do production with the OTP PROM from the same family of parts.
I know the PROM chip didn't have any transient data as they were not programmable in the product, only in the stand-alone programmer. The chip you refer to is the Atmel 24C02N, it's an 8-pin SOIC part, it's a 2K bit serial I2C EEPROM. Doubtless, that's where any transient data was stored. Serial EEPROM was very common for parameter storage in the timeframe these boards were developed.
