Use this board to make a ZX Spectrum or Zebra OS-64 cartridge using one-time-programmable EPROMS like the 27128 or 27256 or reprogrammable devices like the 28256.

This board supports mapping a ROM to any of the 8 “chunks” of memory in the TS 2068. Traditionally, chunks 0 and 1 are used by the HOME ROM and EXROM. Many Timex command cartridges also used those chunks, as did Zebra’s OS-64 cartridge. Other products, like HOT-Z 2068, were BASIC programs moved to a command cartridge and used chunks 4 and higher (HOT-Z is a 24K ROM).