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I designed this printed circuit board (PCB) to allow regular 2732 through 27256 EPROM chips to be plugged into the cartridge expansion port of a TRS-80 Color Computer. My main motivation was to crank out a simple design to try out a prototype PCB vendor called OSH Park. Unlike most small-run, online-ordered PCB vendors, they provide boards with ENIG (gold plating) surface finish, which is much better than HASL (solder plating) for edge connectors.