MirOS Manual: vga(4)

VGA(4)                     BSD Programmer's Manual                      VGA(4)

NAME

     vga - VGA graphics driver for wscons

SYNOPSIS

     vga0 at isa?
     vga* at pci?
     wsdisplay* at vga? console ?
     option PCIAGP

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
             built-in font of this size is always present on a VGA card. It's
             also possible to use a downloaded font instead.

     80x25bf 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.

     80x40   A text mode with 80 columns and 40 rows. Similar to the standard
             mode, 16 colors and 256 characters are available. Characters are
             8 x 10 pixels large. For this mode to be useful, a font of that
             character size must be downloaded.

     80x40bf 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 columns 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 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.

     80x24   A variant of the "80x25" screen type which displays 24 lines
             only. It uses the standard 8x16 VGA font. This mode might be use-
             ful for applications which depend on closer DEC VT100 compatibil-
             ity.

     80x24bf 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.

     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
     former OpenBSD/i386 pcvt driver distribution can be used too if option
     WSCONS_SUPPORT_PCVTFONTS was set at kernel 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.

     option PCIAGP enables support for the AGP GART programming through the
     ioctl(2), for use by the XFree86(1) on some architectures.

SEE ALSO

     intro(4), isa(4), pcdisplay(4), pci(4), wscons(4), wsdisplay(4),
     wsconscfg(8), wsfontload(8)

BUGS

     Only a subset of the possible text modes is supported.

     VGA cards are supposed to emulate an MDA if a monochrome display is con-
     nected. In this case, the device will naturally not support colors at
     all, but offer the capability to display underlined characters instead.
     The "80x25bf", "80x40bf", "80x50bf", and "80x24bf" screen types will not
     be available. This mode of operation is not tested.

MirOS BSD #10-current           March 20, 1999                               1

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