Int 2F/AX=F100h

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

See Also: AH=A1h - AX=ED00h - AX=FBA1h/BX=0081h - INT 15/

Category: DOS Extenders - Int 2Fh - D