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UPD765B - Single / Double Density Floppy-Disk Controller

This page provides the datasheet information for the UPD765B, a member of the UPD765A Single / Double Density Floppy-Disk Controller family.

Datasheet Summary

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.

Features

  • 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 head unload time are user-programmable. The uPD765A/uPD765B offers additional features such as multi-track and multi-side read and write commands and single and double density capabilities. FM, MFM Control Variable recording length: 128,256, .8192 bytes/ sector IBM-compatible format (single- and doublesided, single- and dou.

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Datasheet preview – UPD765B

Datasheet Details

Part number UPD765B
Manufacturer NEC Electronics
File Size 335.09 KB
Description Single / Double Density Floppy-Disk Controller
Datasheet download datasheet UPD765B Datasheet
Additional preview pages of the UPD765B datasheet.

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Full PDF Text Transcription

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NEC 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 precompensation circuitry. The FDC simplifies and handles most of the burdens associated with implementing a floppy disk interface.
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