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AHA(4)			     Kernel Interfaces Manual			  AHA(4)

NAME
     aha -- Adaptec SCSI host adapter driver

SYNOPSIS
     device aha0 at isa? port ? irq ? drq 5
     device scbus0 at aha0

DESCRIPTION
     This  driver provides access to the SCSI bus connected to an Adaptec 154xA,
     154xB, 154xC, 154xCF, or 154xCP host adapter.  Host adapters  supporting  a
     154X  compatible interface, such as some Tekram controllers and the Adaptec
     174x in 154x emulation mode can, also be attached with  this  driver.   For
     optimum  performance,  Adaptec 174x controllers should be configured in en-
     hanced mode and attached via the ahb(4) driver.

     One kernel config entry for every card to be attached by the system is  re-
     quired.   Specific  values for the port address, irq, and drq may be speci-
     fied.  If wildcard values are used, the driver will query	the  device  for
     its current settings and use those.  If the port address is a wildcard, the
     driver  consults  an  internal table of possible port address locations and
     attaches to the first unattached card it  finds.	The  possible  port  ad-
     dresses for this card are 0x330, 0x334, 0x230, 0x234, 0x130, and 0x134.

SEE ALSO
     ahb(4), ahc(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS
     The  aha  driver was ported by M. Warner Losh from the bt driver written by
     Justin T. Gibbs.

FreeBSD 4.5			October 15, 1998			  AHA(4)

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