84 lines
2.6 KiB
Plaintext
84 lines
2.6 KiB
Plaintext
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Plex86/Bochs VGABios
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--------------------
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The goal of this project is to have a LGPL'd Video Bios in plex86
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and bochs.
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This VGA Bios is very specific to the emulated VGA card.
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It is NOT meant to drive a physical vga card.
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Install
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-------
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To compile the VGA Bios you will need :
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- gcc
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- bcc
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- as86
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- ld86
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Untar the archive, and type make. You should get a "vgabios.bin" file.
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Alternatively, you can use the binary file "vgabios-XXX.bin", i have
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compiled for you.
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Edit your plex86/bochs conf file, and modify the load-rom command in the
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VGA BIOS section, to point to the new vgabios.bin file.
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Debugging
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---------
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You can get a very basic debugging system: messages printed by the vgabios.
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You have to register the "unmapped" device driver in plex86 or bochs, and make
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sure it grabs port 0xfff0.
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Comment the #undef DEBUG at the beginning of vgabios.c.
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You can then use the "printf" function in the bios.
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Testing
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-------
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Look at the "testvga.c" file in the archive. This is a minimal Turbo C 2.0
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source file that calls a few int10 functions. Feel free to modify it to suit
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your needs.
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The VGA Bios in its current version has been very little tested.
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Copyright and License
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---------------------
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This program has been written by Christophe Bothamy
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It is protected by the GNU Lesser Public License, which you should
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have received a copy of along with this package.
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Reverse Engineering
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-------------------
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The VGA Bios has been written without reverse-engineering any existing Bios.
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Acknowledgment
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--------------
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The source code contains code ripped from rombios.c of plex86, written
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by Kevin Lawton <kevin@mandrakesoft.com>
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The source code contains fonts from fntcol16.zip (c) by Joseph Gil avalable at :
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ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
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These fonts are public domain
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The source code is based on information taken from :
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- Kevin Lawton's vga card emulation for bochs/plex86
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- Ralf Brown's interrupts list avalaible at
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http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html
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- Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/
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- Michael Abrash's Graphics Programming Black Book
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- Francois Gervais' book "programmation des cartes graphiques cga-ega-vga"
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edited by sybex
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- DOSEMU 1.0.1 source code for several tables values and formulas
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Feedback
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--------
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Please report any bugs, comments, patches for this VGA Bios to cbothamy@free.fr
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You can find the latest release at : http://cbothamy.free.fr/projects/vgabios/
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For any information on plex86, visit the website http://www.plex86.org/
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For any information on bochs, visit the website http://bochs.sourceforge.net/
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