70     01110000              HALT
  72     01110010 NNNNNNNN     X set to N
  73     01110011 NNNNNNNN     Y set to N
  74     01110100 NNNNNNNN     X set to memory[N]
  75     01110101 NNNNNNNN     Y set to memory[N]
  76     01110110              accept X from switches
  77     01110111              accept Y from switches
  78     01111000              display X
  79     01111001              display Y
  7A     01111010              accept X from keyboard
  7B     01111011              accept Y from keyboard
  7C     01111100              type X
  7D     01111101              type Y
  60     01100000              X set to X + Y
  61     01100001              Y set to X + Y
  62     01100010              X set to X - Y
  63     01100011              Y set to X - Y
  64     01100100              X set to X x Y
  65     01100101              Y set to X x Y
  66     01100110              X set to X / Y
  67     01100111              Y set to X / Y