176 lines
5.0 KiB
Groff
176 lines
5.0 KiB
Groff
.\" $NetBSD: va.4,v 1.3 1996/03/03 17:14:15 thorpej Exp $
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.\"
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.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)va.4 6.3 (Berkeley) 3/27/91
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.\"
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.Dd March 27, 1991
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.Dt VA 4 vax
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.Os BSD 4
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.Sh NAME
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.Nm va
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.Nd Benson-Varian interface
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.Sh SYNOPSIS
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.Cd "controller va0 at uba0 csr 0164000 vector vaintr"
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.Cd "disk vz0 at va0 drive 0"
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.Sh DESCRIPTION
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.Bf -symbolic
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(NOTE: the configuration description, while counter-intuitive,
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is actually as shown above.)
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.Ef
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.Pp
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The Benson-Varian printer/plotter in normally used with the line printer
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system.
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This description is designed for those who wish to drive the Benson-Varian
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directly.
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.Pp
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In print mode, the Benson-Varian uses a modified
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.Tn ASCII
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character set.
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Most control characters print various non-
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.Tn ASCII
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graphics such as daggers,
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sigmas, copyright symbols, etc.
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Only
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.Tn LF
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and
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.Tn FF
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are used as format effectors.
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.Tn LF
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acts as a newline,
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advancing to the beginning of the next line, and
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.Tn FF
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advances to the top of
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the next page.
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.Pp
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In plot mode, the Benson-Varian prints one raster line at a time.
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An entire raster line of bits (2112 bits = 264 bytes) is sent, and
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then the Benson-Varian advances to the next raster line.
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.Pp
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.Em Note :
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The Benson-Varian must be sent an even number of bytes.
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If an odd number is sent, the last byte will be lost.
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Nulls can be used in print mode to pad to an even number of bytes.
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.Pp
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To use the Benson-Varian yourself,
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you must realize that you cannot open the device,
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.Pa /dev/va0
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if there is an daemon active.
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You can see if there is an active daemon by doing a
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.Xr lpq 1
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and seeing if there are any files being printed.
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Printing should be turned off using
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.Xr lpc 8 .
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.Pp
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To set the Benson-Varian into plot mode include the file
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.Aq Pa sys/vcmd.h
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and use the following
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.Xr ioctl 2
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call
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.Bd -literal -offset indent
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ioctl(fileno(va), VSETSTATE, plotmd);
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.Ed
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.Pp
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where
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.Ar plotmd
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is defined to be
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.Bd -literal -offset indent
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int plotmd[] = { VPLOT, 0, 0 };
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.Ed
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.Pp
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and
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.Ar va
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is the result of a call to
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.Xr fopen
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on stdio.
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When you finish using the Benson-Varian in plot mode you should advance to
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a new page
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by sending it a
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.Tn FF
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after putting it back into print mode, i.e. by
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.Bd -literal -offset indent
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int prtmd[] = { VPRINT, 0, 0 };
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\&...
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fflush(va);
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ioctl(fileno(va), VSETSTATE, prtmd);
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write(fileno(va), "\ef\e0", 2);
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.Ed
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.Sh FILES
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.Bl -tag -width /dev/va0xx -compact
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.It Pa /dev/va0
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.El
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.Sh DIAGNOSTICS
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The following error numbers are significant at the
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time the device is opened.
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.Bl -tag -width ENXIOxx
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.It Bq Er ENXIO
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The device is already in use.
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.It Bq Er EIO
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The device is offline.
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.El
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.Pp
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The following message may be printed on the console.
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.Pp
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.Bl -diag
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.It va%d: npr timeout.
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The device was not able to get data from
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the
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.Tn UNIBUS
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within the timeout period, most likely because some other
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device was hogging the bus. (But see
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.Sx BUGS
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below).
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.El
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.Sh SEE ALSO
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.Xr vfont 5 ,
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.Xr lpr 1 ,
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.Xr lpd 8 ,
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.Xr vp 4
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.0 .
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.Sh BUGS
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The 1's (one's) and l's (lower-case el's) in the Benson-Varian's
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standard character set look very similar; caution is advised.
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.Pp
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The interface hardware is rumored to have problems which can
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play havoc with the
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.Tn UNIBUS .
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We have intermittent minor problems on the
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.Tn UNIBUS
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where our
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.Xr va
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lives, but haven't ever been able to pin them down
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completely.
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