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AHB(4)			     Kernel Interfaces Manual			  AHB(4)

NAME
     ahb -- Adaptec EISA SCSI host adapter driver

SYNOPSIS
     device ahb
     device scbus

DESCRIPTION
     This  driver  provides  access to the SCSI bus connected to an Adaptec 174x
     hostadapter in "enhanced"	mode.	Tagged	queueing  and  synchronous  SCSI
     transfers are supported.

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), cd(4), da(4), sa(4), scsi(4)

AUTHORS
     The ahb driver was written by Justin T. Gibbs.

FreeBSD 5.0			October 15, 1998			  AHB(4)

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