Help identifying 41C custom ROM module

[Sylvain Cote]

(02-21-2022 01:07 AM)dmh Wrote:  BTW, does anyone have the equipment to rewrite these EPROM modules these days?

Your module is not a ZEPROM, so it's either an CMT OTP/EPROM module or an HP custom ROM.

HP custom ROM and CMT OTP module cannot be reprogrammed.
CMT EPROM and ZEPROM can be erased and reprogrammed.

To my knowledge, very few, if any, working CMT EPROM programmer still exist today.
Some member of this forum still have a working ZVC programmer for the ZEPROM module.

Sylvain