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+.\"
+.\" Copyright (c) 1994 Christian E. Hopps
+.\" All rights reserved.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed by Christian E. Hopps.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+.\"
+.\"	$NetBSD: zssc.4,v 1.11 2009/03/09 19:24:29 joerg Exp $
+.\"
+.Dd August 31, 1994
+.Dt ZSSC 4 amiga
+.Os
+.Sh NAME
+.Nm zssc
+.Nd Zeus low level SCSI interface
+.Sh SYNOPSIS
+.Cd "zssc0 at zbus0"
+.Sh DESCRIPTION
+The
+.Tn Amiga
+architecture uses a common machine independent scsi sub-system
+provided in the kernel source.  The machine independent
+drivers that use this code access the hardware through a
+common interface. (see
+.Xr scsibus 4 )
+This common interface interacts with a machine dependent interface,
+such as
+.Nm zssc ,
+which then handles the hardware specific issues.
+.Pp
+The
+.Nm
+interface handles things such as DMA and interrupts as well as
+actually sending commands, negotiating synchronous or asynchronous
+transfers and handling disconnect/reconnect of SCSI targets.
+The hardware that
+.Nm
+uses is based on the NCR53c710 SCSI chip.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It zssc%s: abort %s: dstat %02x, sstat0 %02x sbcl %02x
+The scsi operation %s was aborted due to error.  Dstat, sstat and
+sbcl are registers within the NCR53c710 SCSI chip.
+.It siop id %d reset
+The NCR53c710 SCSI chip has been reset and configure at id %d.
+.It SIOP interrupt: %x sts %x msg %x sbcl %x
+The NCR53c710 SCSI chip has interrupted unexpectedly.
+.It SIOP: SCSI Gross Error
+The NCR53c710 SCSI chip has indicated that it is confused.
+.It SIOP: Parity Error
+The NCR53c710 SCSI chip has indicated that it has detected a
+parity error on the SCSI bus.
+.El
+.Sh SEE ALSO
+.Xr scsibus 4
+.Sh HISTORY
+The
+.Nm
+interface first appeared in
+.Nx 1.0