AHB(4) MidnightBSD Kernel Interfaces Manual AHB(4)

NAME

ahb — Adaptec EISA SCSI host adapter driver

SYNOPSIS

device ahb
device scbus

DESCRIPTION

This driver provides access to the SCSI bus connected to an Adaptec AHA-174X host adapters in ‘‘enhanced’’ mode. Tagged queueing and synchronous SCSI transfers are supported.

HARDWARE

The ahb driver supports the following SCSI host adapters:

Adaptec AHA-1740

Adaptec AHA-1742

Adaptec AHA-1740A

Adaptec AHA-1742A

CAVEATS

The Adaptec 174X is very sensitive to SCSI bus termination and cable length. It may also have difficulties operating with some modern devices that, due to their speed, expose timing problems in the controller. There are no known mechanisms for working around device incompatibilities of this nature.

SEE ALSO

aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS

The ahb driver was written by Justin T. Gibbs.

MidnightBSD 0.3 July 4, 2004 MidnightBSD 0.3