Model I

In the olden days, when 2732 EPROMs still were manufactured, flashing a new ROM for the Model I was easier. Since that is no longer an option, and there is no direct replacement for the TRS-80 ROMs anymore, people have been writing up methods to use a modern 27C256 EPROM.

Using a single 27256 EPROM

One point of note: You may need to verify that the motherboard does not have a solder bridge between Pin 7 and Pin 18 of ROM A. Some boards might have this. This bridge will prevent the EPROM from working.