High Voltage Differential PCI SCSI Adapter with Dual HVD external connectors.
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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)
differential scsi (html 68 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)
7800 fms support list (html 72 kb)
Product Documentation
Install Guide for the AHA-3940U/UW/UWD (PDF 161 KB)
User Guide for the AHA-3940U/UW/UWD (PDF 473 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 High Voltage Differential SCSI devices

Bus System Interface Type

32-bit PCI Local Bus, Rev 2.1 compliant bus interface
External Connectors
two 68-pin Very High Density SCSI connectors
Internal Connectors
68-pin SCSI connector, Channel A68-pin SCSI connector, Channel B
Data Transfer Rate
Up to 40.0 MBytes/sec Synchronous Wide UltraSCSI Data Rate per Channel
System Requirements
IBM compatible PC, the motherboard BIOS must support PCI-to-PCI bridges
Package Contents
AHA-3944AUWD 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 Documentation
5 years

Board Dimensions

6.875" L x 4.2" H (17.46 cm x 10.67 cm)

Power Consumption

5.0 +/- 0.25V (1.5A maximum)

Operating Characteristics

0°C(32°F) to 55°C(131°F)

Storage Characteristics

-55°C(-67°F) to 85°C(185°F)