NAME

athd − low-level controller module

DESCRIPTION

The athd module provides low-level interface routines between the High Performance Device Driver (see hpdd(7)) and the MFM, RLL, or ESDI controllers in an AT-compatible machine.  It can be configured for disk support for one or more controller boards.  The low-level code determines if the controller is, in fact, present at the configured address (see disk(7) and tape(7)) and what devices are attached to it. It handles simultaneous requests for all devices, overlapping operations where the devices will permit.

For information on configuring a kernel to include the athd module, refer to the “INTERACTIVE UNIX Operating System Maintenance Procedures.”

Board Configuration

The default configuration described in the User’s Manual that accompanies the controller board 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 required. 

SEE ALSO

aha1520(7), aha1540(7), aha1740(7), bt742(7), disk(7), dpt20xx(7), hpdd(7), ida(7), mcesdi(7), mcst(7), tape(7), tmc8x0(7), wdasc(7), wdex(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. 

\*U  —  Version 1.0