40:17   byte   keyboard flag byte 0 (see Int\09)
		bit 7  insert mode on      3  alt pressed 
		    6  capslock on         2  ctrl pressed 
		    5  numlock on          1  left shift pressed 
		    4  scrollock on        0  right shift pressed 
 40:18   byte   keyboard flag byte 1 (see Int\09)
		bit 7  insert pressed      3  ctrl-numlock (pause) toggled 
		    6  capslock pressed    2  PCjr keyboard click active 
		    5  numlock pressed     1  PCjr ctrl-alt-capslock held 
		    4  scrollock pressed   0