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Released in the mid-to-late 1990s, the AHA-2940UW is the iconic PCI SCSI adapter. It was the gold standard expansion card for connecting high-performance storage devices like SCSI hard drives, tape backup drives, CD-ROM towers, and high-end flatbed scanners to desktop computers and entry-level servers. [1, 2, 3]In retro-computing circles, it is widely praised for its rock-solid reliability and legendary compatibility. [1]Core Technical Specifications - Bus Interface: Standard 32-bit PCI slot (operating on standard 5V signaling).
- SCSI Architecture: Supports Ultra Wide SCSI (SCSI-3 protocol).
- Max Data Transfer Rate: Up to 40 MB/s over a 16-bit wide bus.
- Device Capacity: It can manage up to 15 SCSI devices simultaneously on a single bus line. [1, 2, 3]
Physical Connectors & HeadersThe card features three primary physical interface options: [1, 2] - External 68-pin High-Density (HD68) Port: Found on the back bracket to chain external enclosures, scanners, or external storage arrays.
- Internal 68-pin Ribbon Cable Connector: For high-speed internal Ultra Wide SCSI hard drives.
- Internal 50-pin Ribbon Cable Connector: For legacy 8-bit narrow SCSI devices, such as vintage CD-ROM drives or older SCSI-2 hard disks. [1, 2, 3]
Software & Operating System Drivers - Built-in BIOS Utility: The card features its own onboard ROM banner. Pressing Ctrl + A during the post screen triggers the SCSISelect utility, letting you toggle manual bus termination, assign SCSI IDs, and low-level format attached drives. [1, 2]
- Vintage Compatibility: Flawless, native, out-of-the-box support for DOS, Windows 95, Windows 98, Windows NT, Windows 2000, and early Linux distros. [1, 2, 3]
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