Each AHA-3940UWD host adapter has two SCSI channels, each of which functions as an independent host adapter. With the AHA-3940UWD, you can connect up to fifteen 16-bit (Wide) SCSI devices per channel. Using a 68-pin-to-50-pin converter, you can also combine 8-bit and 16-bit SCSI devices, up to 15 per channel; up to seven can be 8-bit devices.
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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




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)
scsi termination q&a (html 71 kb)
Installing Drivers or Software
cd install netware 401 (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)
os/2 driver installation (html 68 kb)
loading adaptec dsk drivers (html 71 kb)
netware 3.12 cd install (html 68 kb)
7800 unix driver instructions (html 75 kb)
os/2 driver notes (html 77 kb)
7800 os/2 diskette (html 69 kb)
7800 os/2 issues (html 68 kb)
sco unix driver installation (html 75 kb)
7800 fms support list (html 72 kb)
Product Documentation
User Guide for the AHA-3940U/UW/UWD (PDF 473 KB)
Install Guide for the AHA-3940U/UW/UWD (PDF 161 KB)
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)
Number of devices
Up to 30 devices

Bus System Interface Type

PCI Local Bus
External Connectors
Two 68-pin Very High Density external connectors
Internal Connectors
One 68-pin, high-density internal connector channel A and B
Data Transfer Rate
80 MByte/sec (40 MByte/sec per channel)
Package Contents
AHA-3940UWD PCI MultiChannel host adapter with SCSISelect utilityAdaptec EZ-SCSI software for DOS and WindowsAdaptec 7800 Family Manager Set softwareAdaptec CI/O Single Server software Complete hardware and software documentationTwo internal SCSI ribbon cables (external cable not included)
5 years

Supported Protocols

16-bit UltraSCSI

Advanced SCSI Features

Advanced SCSI Programming Interface (ASPI) compliant
Multitasking operating system support (through scatter/gather, disconnect/reconnect, tagged command queuing support)
Independent negotiation of high-speed data transfers (Fast, Wide, and synchronous) with each device
Support for 255 simultaneous active SCSI commands per channel

SCSI channels

Two fully independent PCI SCSI channels bridged to system PCI bus

Electrical drivers

Single-ended and active termination.

Board Dimensions

6.875" x 4.0" (17.463 cm x 10.16 cm)

Power Consumption

5 V +/- 5% at 2.0 amps maximum

Operating Characteristics

23 F to 140 F (-5 C to 60 C)10% to 95% Relative Humidity, non condensing

Storage Characteristics

-76 F to 203 F (-60 C to 95 C)