Introduction - Adaptec AHA-3940U User Manual

Introduction

® ®
The Adaptec AHA -3940U, AHA-3940UW, and AHA-3940UWD
MultiChannel PCI-to-UltraSCSI Host Adapters are designed for use
in computers that have 5-volt Peripheral Component Interconnect
(PCI) interface slots. PCI is a local bus interface that enables high-
speed data transfer. Your computer must be PCI
Rev. 2.1-compliant and the motherboard BIOS must support PCI-to-
PCI Bridges. If you aren't sure whether the motherboard BIOS
supports PCI-to-PCI Bridges, contact the motherboard vendor.
Each AHA-3940U/3940UW/3940UWD host adapter has two SCSI
channels, each of which functions as an independent host adapter.
With the AHA-3940U, you can connect up to seven 8-bit SCSI
devices per channel.
With the AHA-3940UW/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.
The AHA-3940U is an 8-bit PCI-to-UltraSCSI host adapter with two
internal connectors and one external connector. The AHA-3940UW
is a 16-bit PCI-to-UltraSCSI host adapter with two internal connec-
tors and one external connector. The AHA-3940UWD is a 16-bit PCI-
to-UltraSCSI host adapter with two internal connectors and two
external connectors.
This document uses the term AHA-3940U/3940UW/3940UWD to
refer to all three host adapter models.
This User's Guide is a companion to the Installation Guide for the
AHA-3940U/3940UW/3940UWD host adapters. Both guides
AHA-3940U/3940UW/3940UWD User's Guide
Stock Number: 511041-00, Rev. B
Print Spec Number: 494569-00
Current Date: 2/14/97
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ECN Date: 2/17/97