Datasheet Summary
NEC Electronics Inc. uPD765A/uPD765B Single/Double Density
Floppy-Disk Controller
Description
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 density format (MFM) including double-sided recording. The uPD765A/B provides control signals which simplify the design of an external phase-locked loop and write prepensation circuitry. The FDC simplifies and handles most of the burdens associated with implementing a floppy disk interface.
Hand-shaking signals are provided in the uPD765A/B which...
