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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 syn‐
      chronous 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.
      aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS

      The ahb driver was written by Justin T. Gibbs.