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AHA(4)		       FreeBSD 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
     interface,	such as	some Tekram controllers	and the	Adaptec	AHA-174x in
     154x emulation mode can also be attached with this	driver.	 For optimum
     performance, 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
     required.	Specific values	for the	port address, irq, and drq may be
     specified.	 If wildcard values are	used, the driver will query the	device
     for its current settings and use those.  If the port address is a wild-
     card, the driver consults an internal table of possible port address
     locations and attaches to the first unattached card it finds.  The	possi-
     ble 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.

FreeBSD	5.2.1		       October 15, 1998			 FreeBSD 5.2.1


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