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INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - INSTALLATION CHECK
AX = 1B00h
Return: AL = FFh if installed
Note: XMA2EMS.SYS extension is only installed if DOS has page frames to hide.
This extension hooks onto INT 67/AH=58h and returns from that call data
which excludes the physical pages being used by DOS.
See Also:
2F1B
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