AHB(4) BSD Kernel Interfaces Manual AHB(4)NAME
ahb -- Adaptec 1742 SCSI adapter driver
SYNOPSIS
ahb0 at eisa? slot ? irq ?
scsibus* at ahb?
DESCRIPTION
The ahb driver implements support for the following card:
Adaptec
AHA-1742 EISA SCSI adaptor
SEE ALSO cd(4), ch(4), intro(4), scsi(4), sd(4), st(4)BSD November 29, 1994 BSD
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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 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 incom-
patibilities 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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