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-.\"	$OpenBSD: hpibbus.4,v 1.1 2008/04/01 14:22:28 jmc Exp $
-.\"
-.\" Copyright (c) 1996, 1997 Jason R. Thorpe.  All rights reserved.
-.\" Copyright (c) 1982, 1990, 1993
-.\"	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 $Mdocdate: April 1 2008 $
-.Dt HPIBBUS 4 hp300
-.Os
-.Sh NAME
-.Nm hpibbus
-.Nd HP-IB bus interface
-.Sh SYNOPSIS
-.Cd "hpibbus*	at nhpib?"
-.Cd "hpibbus*	at fhpib?"
-.Pp
-.Cd "hd*	at hpibbus?                 " Pq "disks"
-.Cd "ct*	at hpibbus?                 " Pq "cartridge tapes"
-.Cd "mt*	at hpibbus?                 " Pq "9-track tapes"
-.Cd "ppi0	at hpibbus? slave 5 punit 0 " Pq "plotter"
-.Sh DESCRIPTION
-HP-IB is essentially an IEEE 488 bus,
-with an HP command set
-.Po
-CS/80 on
-.Sq newer
-devices, Amigo on before-the-early-1980s devices
-.Pc
-thrown on top.
-Devices that respond to CS/80 (and probably Amigo, too)
-are tagged with a 16-bit ID.
-.Pp
-HP-IB has a 2-level addressing scheme:
-slave, the analog of a SCSI ID, and punit, the analog of a SCSI LUN.
-.Pp
-The CS/80 ID is unique to the slave, and is shared by all its punits.
-Most devices only have one punit; multiple punits are often used for disk
-drives that have an accompanying tape drive on the second punit,
-or for dual floppy drives.
-.Pp
-In addition, not all HP-IB devices speak CS/80 or Amigo.
-Examples of such devices are HP-IB plotters,
-which simply take raw plotter commands over 488.
-These devices do not have ID tags,
-and often the host cannot even tell if such
-a device is attached to the system.
-.Sh SEE ALSO
-.Xr \&ct 4 ,
-.Xr hd 4 ,
-.Xr intro 4 ,
-.Xr nhpib 4 ,
-.Xr ppi 4