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File: BIOSFUNC.DOC
Subject: Documentation for BIOSFUNC.COM, version 1.01
Date: January 4, 1990
---------------------------------------------------------------------
OVERVIEW
--------
BIOSFUNC.COM is a simple TSR (Terminate-but-Stay-Resident)
program that makes your video card BIOS (Basic Input/Output System) look
like a CGA/MDA, EGA, or VGA.
This program is especially useful if your using the Microsoft C
Graphics Library and an Everex EVGA card with a CGA, MDA, or EGA monitor
attached. The Microsoft C Graphics Library does not like the fact that
these three monitors do not support 640x480 16-color (mode 12h), and thus
refuses to run anything at all. Furthermore, some applications attempt to
auto-detect the video card type by calling certain video BIOS functions.
This works well on Everex EGA and VGA cards, but if you wish to force an
application to run in another mode, like CGA, you can use BIOSFUNC to do it.
BACKGROUND
----------
To determine which card is present, some application programs
call a video BIOS function. Depending on whether the particular function
is supported, the program will know which of the three video cards are
present in the system.
The CGA supports up to function number 0F (hex), the EGA up to
13 (hex), and the VGA up to 1C (hex).
Thus, if you want the video BIOS to look like a CGA, BIOSFUNC
merely ignores functions above 0F (hex). To make the video BIOS look
like an EGA, BIOSFUNC ignores functions above 13 (hex).
Since some software (such as mouse drivers and Everex Extended
functions) uses function numbers above 1C (hex), all functions above
1C (hex) are accepted.
HOW TO USE
----------
The syntax is: BIOSFUNC [cga|ega|vga]
where items in square brackets '[]' are optional, '|' means or. If you
run the program with no or invalid arguments, a short help message appears.
To make the video card look like a CGA/MDA, at the DOS prompt,
C> BIOSFUNC cga
If you run BIOSFUNC with invalid or no arguments, a short help
message appears. You can run it as many times as you want, but only one
copy will be loaded.