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AHA(4)			 BSD Kernel Interfaces Manual			AHA(4)

     aha -- Adaptec SCSI host adapter driver

     device aha
     device scbus

     In	/boot/device.hints:"isa"

     This driver provides access to the	SCSI bus connected to an Adaptec
     AHA-154xA,	AHA-154xB, AHA-154xC, AHA-154xCF, AHA-154xCP, or AHA-1640 host
     adapter.  x is 0 for controllers without a	floppy drive and 2 for con-
     trollers that have	them.  Host adapters supporting	a 154x compatible in-
     terface, such as some Tekram controllers and the Adaptec AHA-174x in 154x
     emulation mode can	also be	attached with this driver.  For	optimum	per-
     formance, Adaptec AHA-174x	controllers should be configured in enhanced
     mode and attached via the ahb(4) driver.

     One device	hint 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
     addresses for this	card are 0x330,	0x334, 0x230, 0x234, 0x130, and	0x134.

     The AHA-154xCP is a plug and play controller.  However, its resources are
     set using the on-board BIOS and cannot be moved.  Failures	to attached
     for this card are often caused when the resources set in the BIOS con-

     The AHA-1640 is a MCA bus card.  Since the	MCA bus	is a self-identifying
     bus, no setting of	hints is required.

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

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

BSD			       October 15, 1998				   BSD


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