204 lines
6.2 KiB
Groff
204 lines
6.2 KiB
Groff
.\" $NetBSD: vga.4,v 1.13 2003/05/04 00:27:17 gmcgarry Exp $
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.\"
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.\" Copyright (c) 1999, 2000
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.\" Matthias Drochner. 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.Dd March 20, 1999
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.Os
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.Dt VGA 4
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.Sh NAME
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.Nm vga
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.Nd VGA graphics driver for wscons
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.Sh SYNOPSIS
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.Cd options VGA_CONSOLE_SCREENTYPE="??x??"
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.Cd options VGA_CONSOLE_ATI_BROKEN_FONTSEL
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.Pp
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.Cd "vga0 at isa?"
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.Cd "vga* at pci?"
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.Cd "wsdisplay* at vga? console ?"
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.Sh DESCRIPTION
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This driver handles
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.Tn VGA
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graphics hardware within the
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.Xr wscons 4
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console framework.
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It doesn't provide direct device
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driver entry points but makes its functions available via
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the internal
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.Xr wsdisplay 4
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interface.
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.Pp
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The
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.Nm
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driver supports text-mode hardware acceleration on the
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.Tn VGA
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hardware. Currently, the driver runs the display with
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a 720\(mu400 pixel resolution. The
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.Tn VGA
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text-mode accelerator divides the display into fixed-size
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character cells. The size of the character cells specifies
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the number of characters available on the screen and the
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resolution of the font. The wsdisplay screen
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.Dq types
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supported by the
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.Nm
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driver are described by the number of character cells available
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on the screen. See below for a complete list of supported
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screen modes in the
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.Nm
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driver.
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.Pp
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Each screen mode requires a suitable font to be loaded into
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the kernel by the
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.Xr wsfontload 8
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utility, before the screen can be used. The size of the font
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and the screen mode must match for use on the 720\(mu400 display.
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For example, a screen mode with 80 columns and 40 rows requires
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a font where each character is 8 pixels wide and 10 pixels high.
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The
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.Nm
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driver can display fonts of the original
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.Tn IBM
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type and ISO-8859-1 encoded fonts.
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A builtin font of 256 characters and 8\(mu16 pixels is always
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present on the
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.Tn VGA
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hardware.
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.Pp
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The colour
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.Tn VGA
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hardware supports the display of 16 different colours at the same
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time.
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It is possible with
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.Tn VGA
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colour systems to fonts with 512 characters at any one time.
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This is due to the fact that with VGA adapters one can specify an
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alternate font to be used instead of bright letters
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(used for highlighting on the screen).
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As an experimental feature, the
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.Dq higher half
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fonts of the former
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.Nx Ns /i386
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.Nm pcvt
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driver distribution can be used too if the kernel option
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.Dq WSCONS_SUPPORT_PCVTFONTS
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was set at compile time.
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This is only useful with the
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.Dq *bf
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screen types; a font containing the
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.Tn ASCII
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range of characters must be available too on this screen.
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.Pp
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Currently, the following screen types are supported:
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.Bl -hang
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.It 80x25
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This is the standard
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.Tn VGA
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text mode with 80 columns and 25 rows.
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Sixteen different colors can be displayed at the same time.
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Characters are 8\(mu16 pixels, and a font consists of 256 characters.
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.It 80x25bf
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is a modified version of the previous.
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It only allows 8 colors to be displayed.
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In exchange, it can access two fonts at the same time, so that
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512 different characters can be displayed.
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.It 80x40
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A text mode with 80 columns and 40 rows.
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Similar to the standard mode, 16 colors and 256 characters are
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available.
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Characters are 8\(mu10 pixels.
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For this mode to be useful, a font of that character size must
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be downloaded.
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.It 80x40bf
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is analogously to
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.Dq 80x25bf
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a version with 512 displayable characters but 8 colors only.
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.It 80x50
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A text mode with 80 columns and 50 rows.
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Similar to the standard mode, 16 colors and 256 characters are
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available.
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Characters are 8\(mu8 pixels.
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For this mode to be useful, a font of that character size must
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be downloaded.
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.It 80x50bf
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is analogously to
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.Dq 80x25bf
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a version with 512 displayable characters but 8 colors only.
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.It 80x24
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is a variant of the
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.Dq 80x25
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screen type which displays 24 lines only.
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It uses the standard 8x16 VGA font.
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This mode might be useful for applications which depend on closer
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.Tn DEC VT100
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compatibility.
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.It 80x24bf
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Analogously, like
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.Dq 80x24
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but with 512 character slots and 8 colors.
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.El
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.Pp
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If you have an Ati videocard and you are experiencing problems with
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fonts other than 80x25, you can try to set
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.Cd options VGA_CONSOLE_ATI_BROKEN_FONTSEL
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in you kernel configuration and see if it helps.
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.Pp
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The
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.Nm
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driver supports multiple virtual screens on one physical
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display.
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The screens allocated on one display can be of different
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.Dq types .
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The type is determined at the time the virtual screen is created
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and can't be changed later.
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Screens are either created at kernel startup
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(then the default type is used) or later with help of the
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.Xr wsconscfg 8
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utility.
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.Sh SEE ALSO
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.Xr isa 4 ,
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.Xr pcdisplay 4 ,
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.Xr pci 4 ,
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.Xr wscons 4 ,
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.Xr wsconscfg 8 ,
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.Xr wsfontload 8
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.Sh BUGS
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Only a subset of the possible text modes is supported.
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.Pp
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.Tn VGA
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cards are supposed to emulate an
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.Tn MDA
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if a monochrome display is connected.
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In this case, the device will naturally not support colors at
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all, but offer the capability to display underlined characters
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instead.
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The
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.Dq 80x25bf ,
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.Dq 80x40bf ,
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.Dq 80x50bf
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and
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.Dq 80x24bf
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screen types will not be available.
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This mode of operation has not been tested.
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