720K External Drive (250-1061) Recommended CPU's Faxback Doc. # 5256 This drive is only usable as a secondary drive for the 1000EX/HX. The cable connecting it is a 30-pin card edge from the 1000EX/HX and goes to the PC board inside the drive. This PCB splits the signals on the 30-pin cable into a standard 34-pin floppy interface and a power connector. This is specific to these two machines. (dtc-07/30/93)