Expand on fonts and font sizes. Shuffle discussion a little.
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gmcgarry
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@ -1,4 +1,4 @@
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.\" $NetBSD: vga.4,v 1.11 2003/02/17 20:07:06 drochner Exp $
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.\" $NetBSD: vga.4,v 1.12 2003/05/04 00:11:54 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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@ -42,7 +42,8 @@ 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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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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@ -50,46 +51,96 @@ 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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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 640\(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 640\(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. 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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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. 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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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. 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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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. 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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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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@ -97,7 +148,8 @@ 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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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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@ -107,27 +159,23 @@ Analogously, like
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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
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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. 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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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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@ -141,14 +189,15 @@ Only a subset of the possible text modes is supported.
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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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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. This mode of operation
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is not tested.
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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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