4 The goal of this project is to have a LGPL'd Video Bios in plex86,
6 This VGA Bios is very specific to the emulated VGA card.
7 It is NOT meant to drive a physical vga card.
13 The Cirrus SVGA extension is designed for the Cirrus emulation in Bochs and
14 qemu. The initial patch for the Cirrus extension has been written by Makoto
20 To compile the VGA Bios you will need :
26 Untar the archive, and type make. You should get a "VGABIOS-lgpl-latest.bin"
27 file. Alternatively, you can use the binary file "VGABIOS-lgpl-latest.bin",
28 i have compiled for you.
30 Edit your plex86/bochs conf file, and modify the load-rom command in the
31 VGA BIOS section, to point to the new vgabios image file.
36 You can get a very basic debugging system: messages printed by the vgabios.
37 You have to register the "unmapped" device driver in plex86 or bochs, and make
38 sure it grabs port 0xfff0.
40 Comment the #undef DEBUG at the beginning of vgabios.c.
41 You can then use the "printf" function in the bios.
46 Look at the "testvga.c" file in the archive. This is a minimal Turbo C 2.0
47 source file that calls a few int10 functions. Feel free to modify it to suit
53 This program has been written by Christophe Bothamy
54 It is protected by the GNU Lesser Public License, which you should
55 have received a copy of along with this package.
60 The VGA Bios has been written without reverse-engineering any existing Bios.
65 The source code contains code ripped from rombios.c of plex86, written
66 by Kevin Lawton <kevin2001@yahoo.com>
68 The source code contains fonts from fntcol16.zip (c) by Joseph Gil avalable at :
69 ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
70 These fonts are public domain
72 The source code is based on information taken from :
73 - Kevin Lawton's vga card emulation for bochs/plex86
74 - Ralf Brown's interrupts list avalaible at
75 http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html
76 - Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/
77 - Michael Abrash's Graphics Programming Black Book
78 - Francois Gervais' book "programmation des cartes graphiques cga-ega-vga"
80 - DOSEMU 1.0.1 source code for several tables values and formulas
85 Please report any bugs, comments, patches for this VGA Bios to info@vruppert.de
86 You can find the latest release at : http://www.nongnu.org/vgabios/
87 For any information on bochs, visit the website http://bochs.sourceforge.net/
88 For any information on qemu, visit the website http://fabrice.bellard.free.fr/qemu/
93 vgabios-0.6a : Aug 19 2006
95 . added minimal support for the video parameter table (VPT)
96 . Cirrus SVGA now supports the "no clear" bit in Cirrus and VESA mode
97 . Bochs VBE protected mode interface improved
98 . save/restore video state support for Bochs VBE and standard VGA added
99 . generate vbetables.h dynamicly
100 . VBE video memory increased to 8 MB (VBE dispi ID changed to B0C4)
101 . lots of 4bpp VBE fixes (all 4bpp VBE modes now enabled)
102 . VGA compatible setup for VBE modes added
104 vgabios-0.5d : Dec 29 2005
106 . Bochs VBE protected mode interface added (based on a patch by malc@pulsesoft.com)
107 . biossums utility now supports VGABIOS sizes up to 64 kBytes
108 . VGA mode 0x11: all color planes must be enabled in this 2-color VGA mode
110 vgabios-0.5c : Jul 07 2005
112 . BIOS configuration word usually reports initial mode 80x25 color text
113 . vgabios function 0x0e (write teletype): linefeed (0x0a) only increments the
116 vgabios-0.5b : May 24 2005
118 . fixed return value for the default case in the VBE section (non-debug mode)
119 . removed unused stuff
121 vgabios-0.5a : Mar 07 2005
123 . Cirrus SVGA extension (initial patches from Makoto Suzuki, improvements
124 from Fabrice Bellard)
125 . vgabios image size is now exactly 32k with a checksum
126 . a lot of vgabios and vbe functions rewritten in assembler
127 . dynamicly generated VBE mode info list
128 . write character function for CGA and LINEAR8 modes
129 . read/write graphics pixel for some graphics modes
130 . text scroll feature for some graphics modes
131 . VBE 8-bit DAC support
133 vgabios-0.4c : Nov 06 2003
135 . fix font problem on initial screen of NT4 Loader
137 vgabios-0.4b : Nov 04 2003
139 . fix offset of character tables
140 . optimizations of CRT controller accesses
141 . VBE i/o registers changed to 0x01CE/CF
142 (suggestion from Daniel Gimpelevich)
143 . "noclear" flag stored in BIOS area
144 . fix character height returned by get_font_info function
146 vgabios-0.4a : Aug 17 2003
148 . VBE mode search rewritten (VBE modes with LFB bit removed)
149 . many bugfixes and optimizations
150 . write character function implemented for graphics modes
151 . support for 15bpp, 16bpp, 24bpp and 32bpp VBE modes added
152 . SVGA mode 0x6A added
153 . VBE modes 0x102, 0x117, 0x118 and 0x142 (Bochs specific)
155 vgabios-0.3b : Nov 23 2002
157 . added lfb-mode numbers (patch from mathis)
158 . updated the Makefile
159 . removed display of copyrights.
160 . changed the Copyright string to "LGPL VGABios developers"
162 . set the cursor shape depending on the current font height
163 . clear BL before calling int 0x10 function 0x1103 in vgabios_init_func
164 . added some text font functions
166 . Forced to new DISPI (0xb0c1) interface (requires latest bochs vbe code)
167 . Added multibuffering support
168 . Added new DISPI interface for: virt width, height, x offset, y offset
169 . Added LFB modes (to be used with the vbe-lfb patch in bochs)
170 see VBE_HAVE_LFB in vbe.c (currently default enabled)
171 . updated TODO & docs for changes after bochs 1.4
173 vgabios-0.3a : Mar 10 2002
175 . Fixed bug in function ah=13
177 . updated vbebios implementation to new api
178 . added vbe_display_api documentation
179 . added 640x400x8, 640x480x8, 800x600x8, 1024x768
180 (>640x480 needs a special bochs patch atm)
181 . added 320x200x8 vbe support (uses the standard 320x200x8 vga mode to
182 display, this allows for testing & having something on screen as well,
183 at least until bochs host side display is up & running)
184 . adding lfbprof (vbe) testprogram (+some small fixes to it)
185 . merging with vbebios 0.2
187 vgabios-0.2b : Nov 19 2001
189 . Fixed bug in function ah=13
191 vgabios-0.2a : Nov 09 2001
193 . Included bugfix from techt@pikeonline.net about grayscale summing
194 . Added the "IBM" string at org 0x1e as Bart Oldeman suggested
195 . Fixed DS and ES that where inverted in the int10 parameters list!
196 . The following have been implemented :
197 - function ax=1a00, ax=1a01, ah=1b
199 . Added debug messages for unimplemented/unknown functions
200 Must be compiled with DEBUG defined. The output is trapped
201 by the unknown-ioport driver of plex/bochs (port 0xfff0 is used)
203 vgabios-0.1a : May 8 2001
205 . First release. The work has been focused only on text mode.
206 . The following have been implemented :
209 - functions ah=00, ah=01, ah=02, ah=03, ah=05, ah=06, ah=07, ah=08
210 ah=09, ah=0a, ah=0e, ah=0f, ax=1000, ax=1001, ax=1002, ax=1003
211 ax=1007, ax=1008, ax=1009, ax=1010, ax=1012, ax=1013, ax=1015
212 ax=1017, ax=1018, ax=1019, ax=101a, ax=101b, ah=12 bl=10,
213 ah=12 bl=30, ah=12 bl=31, ah=12 bl=32, ah=12 bl=33, ah=12 bl=34