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+.\" Copyright (c) 2010, Joerg Wunsch
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 24, 2010
+.Dt GPIB 4
+.Os
+.Sh NAME
+.Nm gpib
+.Nd General-Purpose Instrument Bus (GPIB) driver
+.Sh SYNOPSIS
+Either of the
+.Xr pcii 4
+or
+.Xr tnt4882 4
+drivers use this driver as the backend.
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for driving an IEEE-488 bus, also called
+IEC-625 (or just "IEC bus"), or HP-IB (Hewlett Packard Instrument
+Bus), or GPIB (General Purpose Instrument Bus).
+The device can become either a listener, talker, controller, and
+in particular a master controller on the bus.
+.Ss Example
+The following example code queries the device provided as
+.Va argv[1]
+for its identification response.
+.Bd -literal
+/* compile with:  cc -O -o ibtest ibtest.c -lgpib */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <err.h>
+#include <vis.h>
+
+#include <gpib/gpib.h>
+
+int
+main(int argc, char **argv)
+{
+	int dmm;
+        unsigned char buf[100];
+        char vbuf[sizeof(buf) * 4];
+
+        /* DVM */
+        dmm = ibdev(0, (argc > 1? atoi(argv[1]): 7), 0,
+		    T10s, 1, 0);
+        if (dmm < 0)
+                errx(1, "ibdev = %d\\n", dmm);
+        ibwrt(dmm, "*IDN?\\r\\n", 7);
+        ibrd(dmm, buf, sizeof(buf) - 1);
+        strvisx(vbuf, buf, ibcnt, VIS_WHITE | VIS_CSTYLE);
+        printf("%s\\n", vbuf);
+        return (0);
+}
+.Ed
+.Sh FILES
+.Bl -tag -width /dev/gpibNNib
+.It Pa /dev/gpib Ns Em N Ns "ib"
+Main device node to access the driver.
+.It Pa /dev/gpib Ns Em N Ns "l"
+Listen-only entry to the driver.
+When opening, an instrument can send data to this device on the
+bus in an unaddressed mode, for example hard-copy printer data.
+.El
+.Sh SEE ALSO
+.Xr gpib 3 ,
+.Xr pcii 4 ,
+.Xr tnt4882 4
+.Sh HISTORY
+The
+.Nm
+driver was written by Poul-Henning Kamp, and first appeared in
+.Fx 5.4 .
+.Sh AUTHORS
+This manual page was written by
+.An J\(:org Wunsch .