Add man pages for the gpib(4), pcii(4), and tnt4882(4) drivers.

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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 PCII 4
+.Os
+.Sh NAME
+.Nm pcii
+.Nd National Instruments PCIIA GPIB controller driver
+.Sh SYNOPSIS
+.Cd "device pcii"
+.Pp
+In
+.Pa /boot/device.hints :
+.Cd hint.pcii.0.at="isa"
+.Cd hint.pcii.0.port="0x2e1"
+.Cd hint.pcii.0.irq="7"
+.Cd hint.pcii.0.drq="1"
+.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 driver supports National Instruments PCIIA cards (sometimes
+also refered to as PC2A) and compatibles.
+These cards use a NEC \(mcPD7210 controller IC as the main
+interface between the host computer and the instrument bus.
+.Ss IO memory space layout
+The PCIIA cards use a very specific IO memory space allocation layout.
+The address bits A0 through A9 (which have traditionally been the only
+address bits evaluated on IBM PC XT extension cards) are hardwired to
+address 0x2e1.
+Bits A10 through A12 are used by the \(mcPD7210 register select lines.
+This makes the individual 7210 registers being 0x400 bytes apart in the
+ISA bus address space.
+Address bits A13 and A14 are compared to a DIP switch setting on the
+card, allowing for up to 4 different cards being installed (at base
+addresses 0x2e1, 0x22e1, 0x42e1, and 0x62e1, respectively).
+A15 has been used to select an optional on-board time-of-day clock
+chip (MM58167A) on the original PCIIA rather than the \(mcPD7210
+(which is not implemented on later boards and clones).
+Finally, the IO addresses 0x2f0 ... 0x2f7 are used for a
+.Em special interrupt handling feature
+(re-enable interrupts so the IRQ can be shared), where actually only
+address 0x2f0 plus the actual IRQ level is required for each card.
+Some clones do not appear to require this special IRQ handling, and
+are thus likely to not support the shared IRQ feature.
+.Pp
+Only the base address of the card needs to be specified in the ISA
+device hints; the driver takes care to derive all other IO addresses
+needed during the probe phase.
+.Ss Supported cards
+The following cards are known to be supported:
+.Bl -bullet -offset indent
+.It
+B&C Microsystems PC488A-0
+.It
+National Instruments GPIB-PCII/PCIIA (in PCIIa mode)
+.It
+Axiom AX5488
+.El
+.Sh SEE ALSO
+.\" .Xr libgpib 3 ,
+.Xr gpib 4 ,
+.Xr device.hints 5
+.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 .