ahb man page on FreeBSD

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AHB(4)			 BSD Kernel Interfaces Manual			AHB(4)

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 synchro‐
     nous 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.

BSD				 July 4, 2004				   BSD
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