11010111  = 215   =   D7
   -01110011  = 115   = - 73
  --11------            ----
    01100100  = 100       64


    11011010  = 218   =   DA
   -01010111  =  87   =   57
  ------111-    1--      --- 
    10000011  = 131   =   83

	
    A71   =   101001110001
  - 9CA	  = - 100111001010
  --11-     ----11---111--              
    0A7   =   000010100111