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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 1510,
     152x, 1535, 154xA, 154xB, 154xC, 154xCF,  154xCP,	or  164x  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  at-
     tached with this driver.  For optimum performance, Adaptec 174x controllers
     should be configured in enhanced 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 4.11			October 15, 1998			  AHA(4)

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