INT 21 - DIET v1.43e - READ EMSsee Expanded Memory Specification STATUS
	AX = 37DEh
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	CX = EMSsee Expanded Memory Specification status
	    0000h not used
	    0001h used as work area
	    0002h used for code and as work area
	DX = EMM handle when EMSsee Expanded Memory Specification is in use