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-.\"	$OpenBSD: cgthree.4,v 1.33 2015/11/01 21:26:48 jmc Exp $
-.\"	$NetBSD: cgthree.4,v 1.4 1998/06/11 08:32:20 fair Exp $
-.\"
-.\" Copyright (c) 1992, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This software was developed by the Computer Systems Engineering group
-.\" at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
-.\" contributed to Berkeley.
-.\"
-.\" 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.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
-.\"
-.\"	from: Header: cgthree.4,v 1.3 94/02/03 20:49:52 leres Exp
-.\"     from: @(#)cgthree.4	8.2 (Berkeley) 2/16/94
-.\"
-.Dd $Mdocdate: November 1 2015 $
-.Dt CGTHREE 4 sparc
-.Os
-.Sh NAME
-.Nm cgthree
-.Nd 8-bit color frame buffer
-.Sh SYNOPSIS
-.Cd "cgthree* at sbus?"
-.Cd "cgthree* at obio0" Pq some sun4m models
-.Cd "wsdisplay* at cgthree?"
-.Sh DESCRIPTION
-The
-.Nm
-is a color frame buffer, available as an SBus card or on-board on some sun4c
-and sun4m workstations.
-A small number of frame buffer SBus cards, not manufactured by
-.Tn Sun ,
-are cgthree-compatible and will also be recognized by the
-.Nm
-driver.
-.Pp
-The
-.Nm
-driver interfaces the frame buffer with the
-.Xr wscons 4
-console framework.
-It does not provide direct device driver entry points
-but makes its functions available via the internal
-.Xr wsdisplay 4
-interface.
-.Sh DISPLAY RESOLUTION
-.Ss Sun frame buffers
-If the
-.Nm
-frame buffer is used as the console display, it is possible, for some models,
-to select a different resolution than the default 1152x900 or 1024x768
-by changing the OpenPROM environment.
-To change the default resolution, type the following:
-.Pp
-.Em \   ok
-setenv
-.Em output-device
-screen:r1152x900x66
-.Pp
-to change to a 66Hz 1152x900 resolution.
-.Pp
-If the
-.Nm
-frame buffer is a secondary display, or a serial console is used, the
-display resolution cannot be changed without using an
-.Em nvramrc
-OpenPROM script.
-Refer to the
-.Em Sun Frame Buffer FAQ
-for details.
-.Pp
-The
-.Nm
-frame buffer accepts the following resolutions:
-.Pp
-.Bl -tag -width screen:r1280x1024x76 -compact
-.It screen:r1024x768x77
-Super VGA 1024x768, with a refresh rate of 77Hz.
-This is the default setting on model 501-2691.
-.It screen:r1152x900x66
-Standard 1152x900, with a refresh rate of 66Hz.
-This is the default setting on older models (501-1415 and 501-8044).
-.It screen:r1152x900x76
-Standard 1152x900, with a refresh rate of 76Hz.
-This is the default setting on more recent models (501-1718 and 501-1909).
-.El
-.Pp
-Note that not all models support settings other than their default setting.
-.Ss Tritec GVC-1, Integrix SFB200
-These frame buffers are cgthree-compatible cards with a VGA-compatible video
-connector.
-There are only two resolutions supported, selected by jumper JP2 on the card:
-.Bl -column "short" "Resolution" -offset indent
-.It Sy JP2 Ta Sy Resolution
-.It Li "open" Ta "1024x768, 60Hz"
-.It Li "short" Ta "1152x900, 66Hz"
-.El
-.Sh SEE ALSO
-.Xr intro 4 ,
-.Xr sbus 4 ,
-.Xr wscons 4 ,
-.Xr wsdisplay 4
-.Rs
-.%T Sun Frame Buffer FAQ
-.%U http://www.sunhelp.org/faq/FrameBuffer.html
-.Re