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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.
+.\" 3. 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.
+.\"
+.\"	$Id: ahsc.4,v 1.1 1995/10/18 08:44:26 deraadt Exp $
+.\"
+.Dd August 31, 1994
+.Os NetBSD 1.0
+.Dt AHSC 4 amiga
+.Sh NAME
+.Nm ahsc
+.Nd A3000 low level SCSI interface
+.Sh SYNOPSIS
+.Cd "ahsc0 at mainbus0"
+.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 ahsc ,
+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 WD33c93 SCSI chip.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It sbicwait TIMEO @%d with asr=x%x csr=x%x
+The 33c93 code (sbic) has been waiting too long for a SCSI chip
+operation to complete. %d is the line in the source file
+.Pa amiga/dev/sbic.c
+at which the SCSI chip timed-out.  Asr and csr are status registers
+withing the SCSI chip.
+.It ahsc%d: abort %s: csr = 0x%02x, asr = 0x%02x
+A SCSI operation %s was aborted due to an error.
+.It ahsc%d: csr == 0x%02i
+A error has occured within the SCSI chip code.
+.It ahsc%d: unexpected phase %d in icmd from %d
+The target described by
+.Sq from %d
+has taken the SCSI bus into a phase which is not
+expected durring polled IO.
+.It ahsc%d: unexpected phase %d in icmd from %d
+The target described by
+.Sq from %d
+has taken the SCSI bus into a phase which is not
+expected durring DMA IO setup.
+.El
+.Sh SEE ALSO
+.Xr scsibus 4
+.Sh HISTORY
+The
+.Nm 
+interface first appeared in
+.Nx 0.9a