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UPD765B Datasheet Single / Double Density Floppy-Disk Controller

Manufacturer: NEC (now Renesas Electronics)

Download the UPD765B datasheet PDF. This datasheet also includes the UPD765A variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (UPD765A_NECElectronics.pdf) that lists specifications for multiple related part numbers.

General 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.

Overview

NEC NEC Electronics Inc.

uPD765A/uPD765B Single/Double Density Floppy-Disk.

Key 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.

📁 Similar Datasheet

Brand Logo Part Number Description Manufacturer
NEC Logo UPD765 SINGLE/DOUBLE DENSITY FLOPPY DISK CONTROLLER NEC

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