INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK                       
	AX = C000h
Return: AL = FFh if possibly installed
Range:	AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C001h"HP 100LX",AX=C0AEh"HP 100LX",AX=C0AFh"HP 100LX"