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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.