I have been asked to look at a project, he has an old car ECU and want to make the program data easy to change.

I suggested that we put the code into some flash memory and then alter it from there, the old rom is a 27C128 so its quite small in todays world.

I am not thinking that maybe I could simply put it all inside a PIC and emulate the ROM from there.

Anyone seen any other projects like this or have ideas how to emulate a ROM ?