NAME    [Toc]    [Back]

     ahb -- Adaptec EISA SCSI host adapter driver

SYNOPSIS    [Toc]    [Back]

     device ahb
     device scbus

DESCRIPTION    [Toc]    [Back]

     This driver provides access to the SCSI bus connected to an Adaptec
     AHA-1740, AHA-1742, AHA-1740A, AHA-1742A host adapters in ``enhanced''
     mode.  Tagged queueing and synchronous SCSI transfers are supported.

CAVEATS    [Toc]    [Back]

     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    [Toc]    [Back]

     aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS    [Toc]    [Back]

     The ahb driver was written by Justin T. Gibbs.


FreeBSD 5.2.1		       October 15, 1998 		 FreeBSD 5.2.1