103 lines
2.7 KiB
Groff
103 lines
2.7 KiB
Groff
.\" $NetBSD: vga.4,v 1.1 1999/03/22 19:15:01 drochner Exp $
|
|
|
|
.Dd March 20, 1999
|
|
.Os
|
|
.Dt VGA 4
|
|
.Sh NAME
|
|
.Nm vga
|
|
.Nd VGA graphics driver for wscons
|
|
|
|
.Sh SYNOPSIS
|
|
.Cd "vga0 at isa?"
|
|
.Cd "vga* at pci?"
|
|
.Cd "wsdisplay* at vga? console ?"
|
|
|
|
.Sh DESCRIPTION
|
|
This driver handles
|
|
.Tn VGA
|
|
graphics hardware within the
|
|
.Xr wscons 4
|
|
console framework. It doesn't provide direct device
|
|
driver entry points but makes its functions available via
|
|
the internal
|
|
.Xr wsdisplay 4
|
|
interface.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
driver supports multiple virtual screens on one physical
|
|
display. The screens allocated on one display can be of different
|
|
.Dq types ,
|
|
where a type refers to various display properties. The type is
|
|
determined at the time the virtual screen is created and can't
|
|
be changed later. Screens are either created at kernel startup
|
|
(then the default type is used) or later with help of the
|
|
.Xr wsconscfg 8
|
|
utility.
|
|
.Pp
|
|
Currently, the following screen types are supported:
|
|
.Bl -hang
|
|
.It 80x25
|
|
This is the standard
|
|
.Tn VGA
|
|
text mode with 80 columns and 25 rows. 16 different colors
|
|
can be displayed at the same time. Characters are 8 x 16
|
|
Pixels large, and a font consists of 256 characters. A builtin
|
|
font of this size is always present on a
|
|
.Tn VGA
|
|
card. It's also possible to use a downloaded font instead.
|
|
.It 80x25bf
|
|
is a modified version of the previous. It only allows 8
|
|
colors to be displayed. In exchange, it can access two
|
|
fonts at the same time, so that 512 different characters
|
|
can be displayed.
|
|
.It 80x50
|
|
A text mode with 80 colums and 50 rows. Similar to the
|
|
standard mode, 16 colors and 256 characters are available.
|
|
Characters are 8 x 8 pixels large. For this mode to be useful,
|
|
a font of that character size must be downloaded.
|
|
.It 80x50bf
|
|
is analogously to
|
|
.Dq 80x25bf
|
|
a version with 512 displayable characters but 8 colors only.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Nm
|
|
driver can display fonts of the original
|
|
.Tn IBM
|
|
type and ISO-8859-1 encoded fonts. As an experimental feature, the
|
|
.Dq higher half
|
|
fonts of the NetBSD/i386
|
|
.Xr pcvt 4
|
|
driver distribution can be used too if the kernel option
|
|
.Dq WSCONS_SUPPORT_PCVTFONTS
|
|
was set at compile time. This is only useful with the
|
|
.Dq *bf
|
|
screen types; a font containing the
|
|
.Tn ASCII
|
|
range of characters must be available too on this screen.
|
|
|
|
.Sh BUGS
|
|
Only a subset of the possible text modes is supported.
|
|
.Pp
|
|
.Tn VGA
|
|
cards are supposed to emulate an
|
|
.Tn MDA
|
|
if a monochrome display is connected. In this case, the
|
|
device will naturally not support colors at all, but
|
|
offer the capability to display underlined characters instead.
|
|
The
|
|
.Dq 80x25bf
|
|
and
|
|
.Dq 80x50bf
|
|
screen types will not be available. This mode of operation
|
|
is not tested.
|
|
|
|
.Sh SEE ALSO
|
|
.Xr isa 4 ,
|
|
.Xr pci 4 ,
|
|
.Xr wscons 4 ,
|
|
.Xr wsconscfg 8 ,
|
|
.Xr wsfontload 8
|