01110000              HALT
     01110010 NNNNNNNN     X set to N
     01110011 NNNNNNNN     Y set to N
     01110100 NNNNNNNN     X set to memory[N]
     01110101 NNNNNNNN     Y set to memory[N]
     01110110              accept X from switches
     01110111              accept Y from switches
     01111000              display X
     01111001              display Y
     01100000              X set to X + Y
     01100001              Y set to X + Y
     01100010              X set to X - Y
     01100011              Y set to X - Y
     01100100              X set to X x Y
     01100101              Y set to X x Y
     01100110              X set to X / Y
     01100111              Y set to X / Y