Build a Spectrum ROM Switching Circuit for Your TS2068

I recently purchased some Spectrum ROMs from Zebra Systems with the hope that I might be able to make my own Spectrum rom switching circuit without paying the high price of those circuits that are commercially available. When I examined the TS-2068’s ROM circuitry, I realized that this was an easier task than I had originally assumed! All that I needed was: a Spectrum ROM, an SPDT toggle switch (Radio Shack #275-6725), two feet of insulated wire and two 1ØK ohm resistors (Radio Shack #271-133)