INT 2F - Windows 3.0, DOS 5+ EGA.SYS - INSTALLATION CHECK
        AX = BC00h
Return: AL = 00h not installed, OK to install
           = 01h not installed, not OK to install
           = FFh installed
                BX = 5456h ("TV")
Note:   AH=BCh is the default value, which may be changed by a command line
          parameter to any value between 80h and FFh
SeeAlso: AX=BC06h"EGA",INT 10/AH=FAh"EGA"

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