Model I

Using a single 27256 EPROM

To use install single 27256 EPROM in your 16K Model I follow these instructions written by Matt Boytim. You may need the referenced CPART file or the referenced FF2K.BIN file.

The Dutch TRS-80 group also has a writeup for using a 27128, found at https://trs80.nl/hardware/m1eprom/.