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+.\" $NetBSD: wdsc.4,v 1.12 2017/02/18 22:39:01 wiz Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Steve C. Woodford.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd February 17, 2017
+.Dt WDSC 4 sgimips
+.Os
+.Sh NAME
+.Nm wdsc
+.Nd Western Digital WD33c93 SCSI Bus Interface Controller
+.Sh SYNOPSIS
+.Cd "wdsc* at hpc? offset ?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides an abstraction layer between the SCSI hardware
+found in multitudinous SGI machines (including Personal Iris series,
+Indigo, Indy, Challenge S, Indigo2, and Challenge M) and the machine independent
+SCSI drivers described in
+.Xr scsibus 4 .
+.Pp
+In addition to sending the required SCSI commands to
+target devices on the SCSI bus, the
+.Nm
+driver deals with DMA, device interrupts, sync/async negotiation,
+and target disconnects/reconnects.
+.Sh SEE ALSO
+.Xr scsibus 4 ,
+.Xr sgimips/hpc 4
+.Sh HISTORY
+Wayne Knowles ported the sgimips incarnation of the
+.Nm
+driver from the amiga and atari ports.
+It first appeared in
+.Nx 1.6 .