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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

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.