Document tvrx(4), ok jmc@

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+.\"	$OpenBSD: tvrx.4,v 1.1 2006/04/15 17:34:38 miod Exp $
+.\"
+.\" Copyright (c) 2006, Miodrag Vallat
+.\"
+.\" 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 ``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 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 April 14, 2006
+.Dt TVRX 4 hp300
+.Os
+.Sh NAME
+.Nm tvrx
+.Nd HP98705 TurboVRX
+.Dq TigerShark
+frame buffer
+.Sh SYNOPSIS
+.Cd "tvrx*      at dio?"
+.Cd "wsdisplay* at tvrx?"
+.Sh DESCRIPTION
+The TurboVRX frame buffer is an accelerated, high resolution
+.Pq 1280x1024
+external display, connected to a 98702 DIO-II interface board.
+Models 98705A and 98705C are 8-bit color frame buffers, while model
+98705B is 16-bit color with a 16-bit Z-buffer.
+All models also have four overlay planes.
+.Pp
+The
+.Nm
+driver provides a frame buffer abstraction to the
+.Xr wscons 4
+console framework.
+.Pp
+Currently, the driver can only use one overlay plane, and will run as an
+unaccelerated monochrome frame buffer.
+.Pp
+The TurboVRX cards can be configured using the 5 DIP switches selector on
+the interface board to define the
+.Dq select code .
+The select code value is computed by adding 133 to the number made from the
+five binary digits.
+The default settings, with the two MSB switches set to 1 and the three LSB
+switches set to 0, provide a select code of 157.
+.Sh SEE ALSO
+.Xr dvbox 4 ,
+.Xr gbox 4 ,
+.Xr hyper 4 ,
+.Xr intro 4 ,
+.Xr rbox 4 ,
+.Xr sti 4 ,
+.Xr topcat 4 ,
+.Xr wscons 4 ,
+.Xr wsdisplay 4