High Quality Content by WIKIPEDIA articles! The Cromemco 4FDC Floppy Disk Controller is designed to interface both 5- and 8-inch floppy disk drives to the S-100 computer bus used in Cromemco and other IEEE 696 computers. It also contains an RS232 serial I/O channel with software-selectable baud rates from 110 to 76,800. In addition, it has a 1K resident 2708 ROM containing Cromemco's RDOS, the Resident Disk Operating System. The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives. These drives were interesting in two respects: They used a fast voice coil actuator and not a stepper motor to position the drive read write head. The data separator electronics were on the drive itself. Due to the second fact, an unmodified 4FDC can not be used with 8-inch drives that don't have single-density data separators on the drive electronics. Later Cromemco disk controllers such as the 16FDC and 64FDC contained both single and double density data separators and the 64FDC also supplied write pre-compensation.

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