freebsd man page for ahb

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 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

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 incom-
     patibilities of this nature.

BSD
								   July 4, 2004 							       BSD