Detecting EGA.SYS

Last reviewed: July 23, 1997
Article ID: Q78451

3.00 3.10 WINDOWS kbprg

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows versions 3.0 and 3.1

EGA.SYS is a driver that facilitates the use of the shadow registers in EGA and more advanced video cards. Through the use of the mouse driver's Interrogate Driver function, it is possible to determine if EGA.SYS is installed.

The interface to the Interrogate Driver function is as follows:

   AH = FAh
   BX = 0
   INT 10h

The return values are:

   AX = Restored
   BX = 0 if the mouse driver or EGA.SYS is not installed
      < 2 if EGA.SYS was installed with the mouse driver
     >= 2 if EGA.SYS was installed

For more information, see chapter 10 of the "Microsoft Mouse Programmer's Reference," second edition (Microsoft Press).

Additional reference words: 3.00 3.10
KBCategory: kbprg
KBSubcategory: GdiMisc
Keywords : kb16bitonly

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Last reviewed: July 23, 1997
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