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=-                                                                         -=
=-        Source Code for switching Video Modes without using BIOS         -=
=-                  January 2, 1998     Version 3.0                        -=
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=-        See the README.TXT file for the Disclaimer and other info        -=
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** Note ** This code does not update BIOS when in real mode.  So if you need
that particular functionality, you will have to add this yourself.

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=-   Currently supported Video Modes:    -= Mode Number =-
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=-  03H    -=- 320 x 200 x 256           -=     03H     =-
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=-  10H    -=- 640 x 350 x 16            -=     10H     =-
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=-  12H    -=- 640 x 480 x 16            -=     12H     =-
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=-  13H    -=- 320 x 200 x 256           -=     13H     =-
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=- Chain 4 -=- unchained 320 x 200 x 256 -=     14H     =-
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=- Mode X  -=- unchained 320 x 240 x 256 -=     15H     =-
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=- Mode A  -=- unchained 320 x 400 x 256 -=     16H     =-
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=- Mode B  -=- unchained 360 x 480 x 256 -=     17H     =-
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=- Mode C  -=- 640 x 400 x 16            -=     18H     =-
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To set a video mode using the procedure I already have written:

PUSH *VALUE*   ; Where value is the mode number
CALL SETVIDEOMODE

and thats it the videomode gets set.

Once the video mode is set, you can program each video mode as normal.

Just remember, you can't rely on BIOS so if you need the palette set to the
proper values, you need to set them yourself.

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If you want to use this code in your programs, all you need is which ever
mode you want from MODES.INC and also the procedure SETMODE.

Just

MOV SI, OFFSET *MODE*    ; Where mode is the mode from MODES.INC
CALL SETMODE

If you want the unchained modes, you also need a bit of code from the
SETVIDEOMODE procedure in MAIN.ASM.

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I have also included some source for clearing the screen and plotting a pixel
in all of the unchained modes.

This includes Chain-4, Mode X, Mode A, and Mode B.

The nice feature about this is that all of the modes use exactly the same
memory structure so the same code can be used to program all.

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