| Op-code | Description |
| 0 _ _ | Input -- Copy the current input card into cell number _ _ and advance to the next card. Halt execution if the input card is empty. |
| 1 _ _ | Output -- Copy the contents of cell number _ _ to the current output card and advance to the next card. |
| 2 _ _ | Add -- Add the contents of cell number _ _ to the value of the accumulator. Sets Carry Bit on overflow. |
| 3 _ _ | Subtract -- Subtract the contents of cell number _ _ from the current value of the accumulator. Sets Carry Bit on overflow. |
| 4 _ _ | Load Accumulator -- Clear the accumulator and carry flag, then copy the contents of cell number _ _ into the accumulator. |
| 5 _ _ | Store Accumulator -- Copy the tree digits of the accumulator into cell number _ _. |
| 6 _ _ | Jump -- Place the current value of the program counter into cell 99. Next, change the value of the program counter to _ _. |
| 7 _ _ | Test Accumulator -- If the value of the accumulator is negative, change the value of the program counter to _ _. |
| 8 x y | Shift š Shift the accumulator left x digits, then shift the result right y digits. Shift digits through the Carry Bit and enter zeros from the left and right appropriately. |
| 9 _ _ | Halt -- Replace the value of the program counter with cell number _ _ and then halt execution. |