INT 2F U - PCIBM PC Tools v8 DATAMON, v9+ DPROTECT - ???
	AX = 6284h
	BX = 0004h
	CX = 0004h
Return: AX = 5555h
	BX = ??? (0800h)
	CX = ??? (FCCCh for v8, FCCBh for v9)