121 lines
3.3 KiB
Groff
121 lines
3.3 KiB
Groff
.\" $NetBSD: vga.4,v 1.6 2001/01/03 20:19:42 nathanw Exp $
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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 "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. 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 multiple virtual screens on one physical
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display. The screens allocated on one display can be of different
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.Dq types ,
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where a type refers to various display properties. The type is
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determined at the time the virtual screen is created and can't
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be changed later. 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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.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. 16 different colors
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can be displayed at the same time. Characters are 8 x 16
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pixels large, and a font consists of 256 characters. A builtin
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font of this size is always present on a
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.Tn VGA
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card. It's also possible to use a downloaded font instead.
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.It 80x25bf
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is a modified version of the previous. It only allows 8
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colors to be displayed. In exchange, it can access two
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fonts at the same time, so that 512 different characters
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can be displayed.
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.It 80x40
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A text mode with 80 colums and 40 rows. Similar to the
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standard mode, 16 colors and 256 characters are available.
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Characters are 8 x 10 pixels large. For this mode to be useful,
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a font of that character size must 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 colums and 50 rows. Similar to the
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standard mode, 16 colors and 256 characters are available.
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Characters are 8 x 8 pixels large. For this mode to be useful,
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a font of that character size must 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. 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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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. As an experimental feature, the
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.Dq higher half
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fonts of the former NetBSD/i386
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.Xr pcvt 4
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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. 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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.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. In this case, the
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device will naturally not support colors at all, but
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offer the capability to display underlined characters 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. This mode of operation
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is not tested.
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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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