Dr. Nim is another binary toy computer produced by ESR Inc. Ordinary marbles are used and "information units (bits). As they roll down the game board, they flip the elements of the board, thus operating the Dr. Nim as a computer. Dr. Nim is quite simple and less known then two other binary computers: DIGI-COMP I and DIGI-COMP II, which with appropriate settings can be made to:

1. Count out a specified number of balls.
2. Count in binary arithmetic.
3. Add.
4. Multiply.
5. Multiply and add.
6. Obtain either the "1's" or '2's" complement,
7. Subtract.
8. Divide.
9. Zero or clear.
10. Overflow.
11. Halt.