--- /dev/null
+Plex86/Bochs VGABios
+--------------------
+
+The goal of this project is to have a LGPL'd Video Bios in plex86,
+Bochs and qemu.
+This VGA Bios is very specific to the emulated VGA card.
+It is NOT meant to drive a physical vga card.
+
+
+Cirrus SVGA extension
+---------------------
+
+The Cirrus SVGA extension is designed for the Cirrus emulation in Bochs and
+qemu. The initial patch for the Cirrus extension has been written by Makoto
+Suzuki (suzu).
+
+
+Install
+-------
+To compile the VGA Bios you will need :
+- gcc
+- bcc
+- as86
+- ld86
+
+Untar the archive, and type make. You should get a "VGABIOS-lgpl-latest.bin"
+file. Alternatively, you can use the binary file "VGABIOS-lgpl-latest.bin",
+i have compiled for you.
+
+Edit your plex86/bochs conf file, and modify the load-rom command in the
+VGA BIOS section, to point to the new vgabios image file.
+
+
+Debugging
+---------
+You can get a very basic debugging system: messages printed by the vgabios.
+You have to register the "unmapped" device driver in plex86 or bochs, and make
+sure it grabs port 0xfff0.
+
+Comment the #undef DEBUG at the beginning of vgabios.c.
+You can then use the "printf" function in the bios.
+
+
+Testing
+-------
+Look at the "testvga.c" file in the archive. This is a minimal Turbo C 2.0
+source file that calls a few int10 functions. Feel free to modify it to suit
+your needs.
+
+
+Copyright and License
+---------------------
+This program has been written by Christophe Bothamy
+It is protected by the GNU Lesser Public License, which you should
+have received a copy of along with this package.
+
+
+Reverse Engineering
+-------------------
+The VGA Bios has been written without reverse-engineering any existing Bios.
+
+
+Acknowledgment
+--------------
+The source code contains code ripped from rombios.c of plex86, written
+by Kevin Lawton <kevin2001@yahoo.com>
+
+The source code contains fonts from fntcol16.zip (c) by Joseph Gil avalable at :
+ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
+These fonts are public domain
+
+The source code is based on information taken from :
+- Kevin Lawton's vga card emulation for bochs/plex86
+- Ralf Brown's interrupts list avalaible at
+ http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html
+- Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/
+- Michael Abrash's Graphics Programming Black Book
+- Francois Gervais' book "programmation des cartes graphiques cga-ega-vga"
+ edited by sybex
+- DOSEMU 1.0.1 source code for several tables values and formulas
+
+
+Feedback
+--------
+Please report any bugs, comments, patches for this VGA Bios to info@vruppert.de
+You can find the latest release at : http://www.nongnu.org/vgabios/
+For any information on bochs, visit the website http://bochs.sourceforge.net/
+For any information on qemu, visit the website http://fabrice.bellard.free.fr/qemu/
+
+
+History
+-------
+vgabios-0.6c : Apr 08 2009
+ - Volker
+ . added DPMS support to cirrus vgabios (patch from Gleb Natapov)
+ . use VBE LFB address from PCI base address if present
+ . added support for a lot more non-standard VBE modes (e.g. widescreen modes)
+ . minor bugfixes
+
+vgabios-0.6b : May 30 2008
+ - Volker
+ . added PCI data structure for the Cirrus VGABIOS images
+ . minor bugfixes in biossums utility, VBE support and makefile
+
+vgabios-0.6a : Aug 19 2006
+ - Volker
+ . added minimal support for the video parameter table (VPT)
+ . Cirrus SVGA now supports the "no clear" bit in Cirrus and VESA mode
+ . Bochs VBE protected mode interface improved
+ . save/restore video state support for Bochs VBE and standard VGA added
+ . generate vbetables.h dynamicly
+ . VBE video memory increased to 8 MB (VBE dispi ID changed to B0C4)
+ . lots of 4bpp VBE fixes (all 4bpp VBE modes now enabled)
+ . VGA compatible setup for VBE modes added
+
+vgabios-0.5d : Dec 29 2005
+ - Volker
+ . Bochs VBE protected mode interface added (based on a patch by malc@pulsesoft.com)
+ . biossums utility now supports VGABIOS sizes up to 64 kBytes
+ . VGA mode 0x11: all color planes must be enabled in this 2-color VGA mode
+
+vgabios-0.5c : Jul 07 2005
+ - Volker
+ . BIOS configuration word usually reports initial mode 80x25 color text
+ . vgabios function 0x0e (write teletype): linefeed (0x0a) only increments the
+ cursor row value
+
+vgabios-0.5b : May 24 2005
+ - Volker
+ . fixed return value for the default case in the VBE section (non-debug mode)
+ . removed unused stuff
+
+vgabios-0.5a : Mar 07 2005
+ - Volker
+ . Cirrus SVGA extension (initial patches from Makoto Suzuki, improvements
+ from Fabrice Bellard)
+ . vgabios image size is now exactly 32k with a checksum
+ . a lot of vgabios and vbe functions rewritten in assembler
+ . dynamicly generated VBE mode info list
+ . write character function for CGA and LINEAR8 modes
+ . read/write graphics pixel for some graphics modes
+ . text scroll feature for some graphics modes
+ . VBE 8-bit DAC support
+
+vgabios-0.4c : Nov 06 2003
+ - Christophe
+ . fix font problem on initial screen of NT4 Loader
+
+vgabios-0.4b : Nov 04 2003
+ - Volker
+ . fix offset of character tables
+ . optimizations of CRT controller accesses
+ . VBE i/o registers changed to 0x01CE/CF
+ (suggestion from Daniel Gimpelevich)
+ . "noclear" flag stored in BIOS area
+ . fix character height returned by get_font_info function
+
+vgabios-0.4a : Aug 17 2003
+ - Volker
+ . VBE mode search rewritten (VBE modes with LFB bit removed)
+ . many bugfixes and optimizations
+ . write character function implemented for graphics modes
+ . support for 15bpp, 16bpp, 24bpp and 32bpp VBE modes added
+ . SVGA mode 0x6A added
+ . VBE modes 0x102, 0x117, 0x118 and 0x142 (Bochs specific)
+
+vgabios-0.3b : Nov 23 2002
+ - Christophe
+ . added lfb-mode numbers (patch from mathis)
+ . updated the Makefile
+ . removed display of copyrights.
+ . changed the Copyright string to "LGPL VGABios developers"
+ - Volker
+ . set the cursor shape depending on the current font height
+ . clear BL before calling int 0x10 function 0x1103 in vgabios_init_func
+ . added some text font functions
+ - Jeroen
+ . Forced to new DISPI (0xb0c1) interface (requires latest bochs vbe code)
+ . Added multibuffering support
+ . Added new DISPI interface for: virt width, height, x offset, y offset
+ . Added LFB modes (to be used with the vbe-lfb patch in bochs)
+ see VBE_HAVE_LFB in vbe.c (currently default enabled)
+ . updated TODO & docs for changes after bochs 1.4
+
+vgabios-0.3a : Mar 10 2002
+ - Christophe
+ . Fixed bug in function ah=13
+ - Jeroen
+ . updated vbebios implementation to new api
+ . added vbe_display_api documentation
+ . added 640x400x8, 640x480x8, 800x600x8, 1024x768
+ (>640x480 needs a special bochs patch atm)
+ . added 320x200x8 vbe support (uses the standard 320x200x8 vga mode to
+ display, this allows for testing & having something on screen as well,
+ at least until bochs host side display is up & running)
+ . adding lfbprof (vbe) testprogram (+some small fixes to it)
+ . merging with vbebios 0.2
+
+vgabios-0.2b : Nov 19 2001
+ - Christophe
+ . Fixed bug in function ah=13
+
+vgabios-0.2a : Nov 09 2001
+ - Christophe
+ . Included bugfix from techt@pikeonline.net about grayscale summing
+ . Added the "IBM" string at org 0x1e as Bart Oldeman suggested
+ . Fixed DS and ES that where inverted in the int10 parameters list!
+ . The following have been implemented :
+ - function ax=1a00, ax=1a01, ah=1b
+ - function ax=1130
+ . Added debug messages for unimplemented/unknown functions
+ Must be compiled with DEBUG defined. The output is trapped
+ by the unknown-ioport driver of plex/bochs (port 0xfff0 is used)
+
+vgabios-0.1a : May 8 2001
+ - Christophe
+ . First release. The work has been focused only on text mode.
+ . The following have been implemented :
+ - inits
+ - int 10 handler
+ - functions ah=00, ah=01, ah=02, ah=03, ah=05, ah=06, ah=07, ah=08
+ ah=09, ah=0a, ah=0e, ah=0f, ax=1000, ax=1001, ax=1002, ax=1003
+ ax=1007, ax=1008, ax=1009, ax=1010, ax=1012, ax=1013, ax=1015
+ ax=1017, ax=1018, ax=1019, ax=101a, ax=101b, ah=12 bl=10,
+ ah=12 bl=30, ah=12 bl=31, ah=12 bl=32, ah=12 bl=33, ah=12 bl=34
+ ah=13
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