VGA(4)

NAME
vga - VGA graphics driver for wscons

SYNOPSIS
vga0 at isa?
vga* at pci?
wsdisplay* at vga? console ?

DESCRIPTION
This driver handles VGA graphics hardware within the wscons(4) console framework. It doesn't provide direct device driver entry points but makes its functions available via the internal wsdisplay(4) interface.

The vga driver supports multiple virtual screens on one physical display. The screens allocated on one display can be of different “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 wsconscfg(8) utility.

Currently, the following screen types are supported:

80x25
    This is the standard 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 VGA card. It's also possible to use a downloaded font instead.

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.

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.

80x50bf
    is analogously to “80x25bf” a version with 512 displayable characters but 8 colors only.

The vga driver can display fonts of the original IBM type and ISO-8859-1 encoded fonts. As an experimental feature, the “higher half” fonts of the NetBSD/i386 pcvt(4) driver distribution can be used too if the kernel option “WSCONS_SUPPORT_PCVTFONTS” was set at compile time. This is only useful with the “*bf” screen types; a font containing the ASCII range of characters must be available too on this screen.

BUGS
Only a subset of the possible text modes is supported.

VGA cards are supposed to emulate an 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 “80x25bf” and “80x50bf” screen types will not be available. This mode of operation is not tested.

SEE ALSO
isa(4), pci(4), wscons(4), wsconscfg(8), wsfontload(8)