Help identifying 41C custom ROM module

[rprosperi]

(02-21-2022 02:36 AM)Sylvain Cote Wrote:  

(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

Is the "65" black label on the module case covering a hole/window in the case, which would be directly above the EPROM chip? If so, this is very likely a CMT module, which I have seen in the past with the exact same "8K" paper label on the "handle" end of the module.

OTOH, I think all the ZEPROM modules from Zengrange either have a "ZENGRANGE" label, or no label at all on the "handle" end.

Once you identify it, it's easier to figure out options for burning it again.