UPD765B controller equivalent, single / double density floppy-disk controller.
Address mark detection circuitry is internal to the FDC
which simplifies the phase-locked loop and read elec-
tronics. The track stepping rate, head load time, and
he.
The uPD765A/B is an LSI floppy disk controller (FDC) chip which contains the circuitry and control functions for interfacing a processor to 4 floppy disk drives. It is capableof either IBM 3740singledensity format (FM), or IBM System 34 double densi.
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