The SCSI Card 2940U2W (or AHA-2940U2W) is the latest in the line of Adaptec PCI host adapters. It has SCSI Ultra2 technology which uses Low Voltage Differential (LVD) circuitry designed into the CMOS to provide a bandwidth that is up to twice the current Ultra speeds and with cable lengths up to 25 meters.
Small Image of AHA-2940U2W
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



Linux Driver Source

Linux Driver Source Code


Microsoft DOS
Microsoft Windows 2000
Microsoft Windows 3.1x
Microsoft Windows 7
Microsoft Windows 95
Microsoft Windows 98
Microsoft Windows Millennium
Microsoft Windows NT
Microsoft Windows Server 2008
Microsoft Windows Vista

Novell NetWare

Novell NetWare Downloads


SCO Unix
SCO UnixWare

Hardware Installation
how to install your adaptec pci card (html 74 kb)
differential scsi (html 68 kb)
ultra2 scsi termination (html 68 kb)
Installing Drivers or Software
cdrom in dos (html 69 kb)
7800 netware instructions (html 81 kb)
7800 family manager set 98 contents (html 68 kb)
installing 98 driver (html 70 kb)
windows 98 issues (html 70 kb)
7800 miniport issues in 95 (html 70 kb)
installing windows nt driver (html 82 kb)
aic7870.dsk options (html 76 kb)
7800 netware contents (html 70 kb)
7800 issues for netware (html 71 kb)
7800 netware notes (html 70 kb)
miniport options (html 70 kb)
7800 diskette contents (html 68 kb)
os/2 driver installation (html 68 kb)
netware 3.12 cd install (html 68 kb)
os/2 driver notes (html 77 kb)
7800 os/2 diskette (html 69 kb)
7800 os/2 issues (html 68 kb)
installing 2940u2w in netware 3.12 (html 69 kb)
install netware v3.12 (html 70 kb)
7800 fms support list (html 72 kb)
intel 'seattle' se440bx-2 motherboards (html 68 kb)
Product Documentation
SCSI Card 2940U2W Kit Contents (PDF 288 KB)
User Reference for the AHA-2940U2W (PDF 487 KB)
SCSI Card 2940U2W (PDF 90 KB)
Adaptec Ultra2 SCSI Card Family (PDF )
Install Guide for the AHA-2940U2W (PDF 3 MB)
Use Your Product
scsi<i>select</i> user's guide (html 83 kb)
scsi terms explained (html 77 kb)
sense codes described (html 96 kb)
hotplugging aha-2940u2w (html 67 kb)
Number of devices
Up to 15 SCSI peripherals

Bus System Interface Type

32-bit PCI local bus
External Connectors
68-pin High-Density Ultra2 SCSI
Internal Connectors
68-pin High-Density Ultra2 68-pin High-Density Wide Ultra SCSI 50-pin High-Density Ultra SCSI
Data Transfer Rate
80 MByte/sec
Package Contents
AHA®-2940U2W PCI-to-Ultra2 SCSI cardAdaptec Family Manager Set software drivers for Windows NT™ 4.0 & 5.0, Windows® 95NetWare 3.1X & 4.X, SCO UnixWare 2.1.2, OS/2 Warp 3 & 4, and SCO Unix 3.2v4.2Adaptec EZ-SCSI™: Installation software plus a suite of 32-bit peripheral management applications68-pin Ultra2 SCSI internal cable with termination68-pin Wide Ultra SCSI internal cable50-pin Ultra SCSI internal cable50-pin internal-to-external Ultra SCSI cable with external bracketComplete user documentationFive-year warranty card
5 year

Supported Protocols


Advanced SCSI Features

  • Advanced SCSI Programming Interface (ASPI) compliant
  • Multi-threaded I/O
  • Scatter/Gather
  • Tagged Queuing
  • Disconnect/Reconnect
  • Synchronous and Asynchronous Fast and Wide
  • Bootable from attached disks

Hard Disk Capacity

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

Electrical Drivers

Single-ended, active, programmable via SCSISelect configuration utility