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aha(4)

NAME

     aha -- Adaptec SCSI host adapter driver

SYNOPSIS

     device aha
     device scbus

     In /boot/device.hints:
     hint.aha.0.at="isa"

DESCRIPTION

     This driver provides access to the SCSI bus connected to the Adaptec
     AHA-154x and AHA-1640 SCSI host adapters.	x is 0 for controllers without
     a floppy drive and 2 for controllers that have them.  For optimum perfor-
     mance, 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-1640 is an MCA bus card.  Since the MCA bus is a self-identifying
     bus, no setting of hints is required.

HARDWARE

     The aha driver supports the following SCSI host adapters:

     o	 Adaptec AHA-154xB
     o	 Adaptec AHA-154xC
     o	 Adaptec AHA-154xCF
     o	 Adaptec AHA-154xCP
     o	 Adaptec AHA-1640
     o	 Adaptec AHA-174x in 154x emulation mode
     o	 DTC 3290 SCSI controller in 1542 emulation mode
     o	 Tekram SCSI controllers in 154x emulation mode

BUGS

     The AHA-154xA card does not support residuals on data transfers.  As a
     result, this card is no longer supported.

     There have been some reports that the AHA-154xB does not work well under
     heavy load.

     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-
     flict.

SEE ALSO

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

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