aha1540(7)           INTERACTIVE UNIX System           aha1540(7)



          NAME
               aha1540 - low-level controller module

          DESCRIPTION
               The aha1540 module provides low-level interface routines
               between the High Performance Disk Driver (see hpdd(7)) and
               the Adaptec AHA-1540, AHA-154XA, and AHA-1640 Intelligent
               Small Computer System Interface (SCSI) Host Adapters.  It
               can be configured for disk or streaming tape support for one
               or more host adapter boards, each of which must be the sole
               initiator on a SCSI bus.  The low-level code determines if
               the adapter is, in fact, present at the configured address
               (see disk(7) and tape(7)) and what types of devices are
               attached to it.  It handles simultaneous requests for all
               devices, overlapping operations where the devices will per-
               mit.

               For information on configuring a kernel to include the
               aha1540 module, refer to the ``INTERACTIVE UNIX Operating
               System Maintenance Procedures.''

             Board Configuration
               The default configurations described in the Adaptec AHA-
               1540/1542 User's Manual or Adaptec AHA-1640 User's Manual
               should be used for standard configurations of the system.
               If more than one board is to be used in a single system,
               each must at least occupy a different set of I/O address
               ranges and use a different DMA channel.  Use of a different
               interrupt level for each board is encouraged, although not
               required.

          SEE ALSO
               athd(7), disk(7), hpdd(7), tape(7), tmc8x0(7).
               ``INTERACTIVE UNIX Operating System Maintenance Procedures''
               in the INTERACTIVE UNIX Operating System Guide.

          ADDED VALUE
               This entry, supplied by INTERACTIVE Systems Corporation, is
               an extension of UNIX System V.
















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