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AHB(4)		       FreeBSD 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 syn-
     chronous SCSI transfers are supported.

HARDWARE
     The ahb driver supports the following SCSI	host adapters:

     +o	 Adaptec AHA-1740
     +o	 Adaptec AHA-1742
     +o	 Adaptec AHA-1740A
     +o	 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.

FreeBSD	9.2			 July 4, 2004			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | CAVEATS | SEE ALSO | AUTHORS

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<http://www.freebsd.org/cgi/man.cgi?query=ahb&sektion=4&manpath=FreeBSD+8.4-RELEASE>

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