77cdb18620
are released, I will remove VGABIOS-cbothamy-0.2a and add a file with the other version number. I decided not to use the "-latest" naming scheme because there is no synchronization between bochs releases and LGPL VGA BIOS releases. Anything that's called "latest" is bound to go obsolete eventually.
84 lines
2.6 KiB
Plaintext
84 lines
2.6 KiB
Plaintext
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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