PC-Ditto came in two versions, software only, and a hardware version that plugged into the cartridge slot or kludged internally. After running the PC-Ditto software, you had to insert a DOS boot disk to load the system. Both allowed you to run DOS programs in CGA mode, though much more slowly than on an IBM PC. Other options were the PC-Speed (NEC V30), AT-Speed (Intel 80286) and ATonce-386SX (Intel 80386sx) hardware emulator boards.
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