HP portable / HP 110 Service Manual

[J-F Garnier]

(08-19-2019 04:38 AM)S0N1C Wrote:  Isn't it possible to replace ROM with EEPROM making some modifications to a board?

The Lotus ROM are (IIRC) 1 Mbits type (they are using the A16 address line). In theory, they could be replaced by a 27C1024 but this EPROM is a 32-pin device and this would require some kind of adapter.
I don't know any existing image of the Lotus ROM.

J-F