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The Adaptec ACB-2322 is a high-performance ESDI Hard Disk and Floppy Disk Controller for the IBM PC/AT and equivalent personal computers. The ACB-2322 is software and hardware compatible with the IBM PC/AT hard disk controller interface.
Small Image of ACB-2322
DownloadsDocumentationTechnical Specifications

Note: Only drivers that are not included or embedded within a supported operating system are listed below. To see a complete list of supported operating systems see the Product Specifications

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Bios Updates and Other Downloadable Files

Bios Updates and Other Downloads


Microsoft DOS

obsolete product info (html 69 kb)
Product Documentation
User's Guide for the ACB 2322 (PDF 938 KB)
System Requirements
The Adaptec ACB-2322 Hard Disk and Floppy Controller has been designed to run in IBM PC/AT-compatible computersthat do not have a separate or embedded floppy disk controller.PC or MS-DOS Version 3.0 or higher, system and supplemental program diskettesA diagnostic progam diskette that allows the PC/AT-compatible computers' configuration RAMto be set up (such as the diagnostics diskette IBM supplies with it's PC/ATs).Adaptec ACB-2322 hard disk and floppy disk controllerAn ESDI Winchester disk drive5 1/4" or 3 1/2" floppy disk drive20 and 34-pin flat or twisted ribbon cables for hard disk34 pin twisted ribbon cable for floppy disk

The ACB-2322 Features

IBM hardware compatible
IBM software compatible
Supports two enhanced small disk interface (ESDI) drives
Highest AT ESDI performance
Non-interleaved operation
Hard sectored and soft sectored ESDI drive support
Support for 32 to 36 sectors per track
Optional on-board Adaptec ACB-BIOS
ACB-BIOS low-level primary format
ACB-BIOS ability to read ESDI drive parameters
ACB-BIOS ability to read ESDI manufacturer's defect list
ACB-BIOS ability to add grown defects, save and protect all defect lists
ACB-BIOS sector-level defect mapping
ACB-BIOS data verification using worst case data patterns
ACB-BIOS autoconfiguration of ESDI drives, not in AT system BIOS
ACB-BIOS large disk logical partitioning
ACB-BIOS downloadable DOS driver
Support of two IBM AT-type floppy disk drives
Analog floppy data separator
XT height board
High component integration using Adaptec ICs
Use of surface mount technology

Power Consumption

5V +/- 5V, 1.7 Amp (typical)

Operating Characteristics

0°C to 55°C (32°F to 131"F)
10% to 95% non-condensing relative humidity
Altitude-feet: Sea Level to 10,000

Storage Characteristics

-40°C to 75°C (-40°F to 167°F)
Altitude-feet: Sea Level to 20,000

MTBF (mean time between failures, Bellcore)

20,000 at 55°C