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The AHA-2740A series is the fastest and most versatile EISA-to-Fast SCSI host adapter from Adaptec. This family utilizes 32-bit bus mastering at 33 Mbytes/seconds and is powered by Adaptec's 8 MIPS PhaseEngine RISC processor, accelerating system performance by reducing SCSI I/O command processing overhead by 90%. The AHA-2740A series of host adapters can process hundreds of SCSI requests simultaneously using command swapping to improve I/O throughput up to 50%. The result is maximized EISA system performance for your demanding multitasking applications such as client/server, engineering CAD/CAM and transaction processing.
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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

Select your operating system or software below

Bios Updates and Other Downloadable Files

Bios Updates and Other Downloads




Microsoft Windows NT

Novell NetWare

Novell NetWare Downloads


SCO Unix

Installing Drivers or Software
cd install netware 401 (html 69 kb)
cdrom in dos (html 69 kb)
unix driver disk conversion (html 69 kb)
loading adaptec dsk drivers (html 71 kb)
netware 3.12 cd install (html 68 kb)
Product Documentation
Install Guide for the AHA-2740A (PDF 156 KB)
Use Your Product
scsi terms explained (html 77 kb)
sense codes described (html 96 kb)
Supported Operating Systems
IBM OS/2 1.3x
IBM OS/2 2.x
Microsoft MS-DOS 5.x
Microsoft MS-DOS 6.x
Microsoft Windows NT 3.51
Microsoft Windows NT 4.0
Novell NetWare 3.10
Novell NetWare 3.11
Novell NetWare 3.12
Novell NetWare 4.0
Novell NetWare 4.01
Novell NetWare 4.10
Novell NetWare 4.11
Novell NetWare 4.12
Novell NetWare 4.20
SCO Unix
Microsoft Windows 95
Microsoft Windows 95a
Microsoft Windows 95b
Microsoft Windows 95c
Microsoft Windows 3.10
Microsoft Windows for Workgroups 3.11
Number of devices
Supports up to seven (7) disks under DOS 5.0 on each channel

Bus System Interface Type

32-bit EISA
External Connectors
flat 50-pin SCSI-2 external high density
Internal Connectors
50-pin SCSI-2 internal
Data Transfer Rate
up to 10 MB/sec

Device Protocol


Hard Disk Capacity

Extended translation scheme supports up to eight (8) Gbytes per disk

Advanced SCSI Features

Advanced SCSI Programming Interface (ASPI) compliant,
multithreaded I/O,
tagged queuing,
synchronous and asynchronous data transfer,
8 and 16-bit data transfers

Electrical Termination

Single-ended, active, software-controlled

Board Dimensions

7 inches (17.8 cm) L
5 inches (12.7 cm) H

Power Consumption

+5.0 +/- 0.25 Volts at 2.0 amps maximum

Operating Characteristics

0 C to 55 C (32 F to 131 F)
10% to 95%, non-condensing Relative Humidity

Storage Characteristics

-40 C to 75 C (-40 F to 167 F)