ahb (4)

Leading comments

Copyright (c) 1994 Wilko Bulte
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other ...

(The comments found at the beginning of the groff file "man4/ahb.4freebsd".)

NAME

ahb - Adaptec EISA SCSI host adapter driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device scbus device ahb

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

ahb_load="YES"

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 driver supports the following SCSI host adapters:

• Adaptec AHA-1740
• Adaptec AHA-1742
• Adaptec AHA-1740A
• Adaptec AHA-1742A

SEE ALSO

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

AUTHORS

The driver was written by An Justin T. Gibbs .

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.