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UPD765B - Single / Double Density Floppy-Disk Controller

Download the UPD765B datasheet PDF. This datasheet also covers the UPD765A variant, as both devices belong to the same single / double density floppy-disk controller family and are provided as variant models within a single manufacturer datasheet.

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.

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.

📥 Download Datasheet

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

📁 Similar Datasheet

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Other Datasheets by NEC (now Renesas Electronics)

Part Number Description
UPD765A Single / Double Density Floppy-Disk Controller
UPD70008 8-Bit CMOS Microprocessors
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UPD7001 8-Bit CMOS Serial I/O Analog to Digital Converter
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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.