40:87   byte   mode options (EGA only) 
		bit 1   0 = EGA is connected to a color display 
			1 = EGA is monochrome. 
		bit 3   0 = EGA is the active display, 
			1 = "other" display is active. 
		mode combinations: 
		bit3  Bit1     Meaning 
		  0     0   EGA is active display and is color 
		  0     1   EGA is active display and is monochrome 
		  1     0   EGA is not active, a mono card is active 
		  1     1   EGA is not active, a CGA is active 
 40:87   byte   (PCjr only) current Fn key code 
 40:88   byte   feature bit switches (EGA only) 0=on, 1=off 
		bit 3 = switch 4  
		bit 2 = switch 3 
		bit 1 = switch 2 
		bit 0 = switch 1