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INT 2F - DOS EXTENDER INSTALLATION CHECK
        AX = F100h
Return: AL = FFh if DOS extender present
            SI = 444Fh ("DO")
            DI = 5358h ("SX")
Note:   supported or soon to be supported by Phar Lap, Rational, Ergo, and IGC
SeeAlso: AX=ED00h,AX=FBA1h/BX=0081h,INT 15/AX=BF02h
See Also: 2FA1
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