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.conf(5):

             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 ahb 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 ahb driver was written by 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.

Debian                                            July 4, 2004                                            AHB(4)