1.\" $NetBSD: ppi.4,v 1.9 2017/02/17 22:24:46 christos Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Systems Programming Group of the University of Utah Computer 8.\" Science Department. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)ppi.4 8.1 (Berkeley) 6/9/93 35.\" 36.Dd February 17, 2017 37.Dt PPI 4 hp300 38.Os 39.Sh NAME 40.Nm ppi 41.Nd 42.Tn HP-IB 43printer/plotter interface 44.Sh SYNOPSIS 45.Cd "ppi0 at hpibbus0 slave 5" 46.Sh DESCRIPTION 47The 48.Nm ppi 49interface provides a means of communication with 50.Tn HP-IB 51printers and plotters. 52.Pp 53Special files 54.Pa ppi0 55through 56.Pa ppi7 57are used to access the devices, with the digit at the end 58of the filename referring to the bus address of the device. 59Current versions of the autoconf code can not probe for these 60devices, so the device entry in the configuration file must be 61fully qualified. 62.Pp 63The device files appear as follows: 64.Bd -literal -offset indent 65"crw-rw-rw- 1 root 11, 0 Dec 21 11:22 /dev/ppi" 66.Ed 67.Sh DIAGNOSTICS 68None. 69.Sh SEE ALSO 70.Xr hp300/hpib 4 71.Sh BUGS 72This driver is very primitive, it handshakes data out byte by byte. 73It should use 74.Tn DMA 75if possible. 76