Instruction Set (1949)
| A n | Add the number in storage location n into the accumulator |
| S n | Subtract the number in storage location n from the accumulator |
| H n | Copy the number in storage location n into the multiplier register |
| V n | Multiply the number in storage location n by the number in the multiplier register and add the product into the accumulator |
| N n | Multiply the number in storage location n by the number in the multiplier register and subtract the product from the accumulator |
| T n | Transfer the contents of the accumulator to storage location n and clear the accumulator |
| U n | Transfer the contents of the accumulator to storage location n and do not clear the accumulator |
| C n | Collate [logical and] the number in storage location n with the number in the multiplier register and add the result into the accumulator |
| R 2^(n-2) | Shift the number in the accumulator n places to the right |
| L 2^(n-2) | Shift the number in the accumulator n places to the left |
| E n | If the sign of the accumulator is positive, jump to location n; otherwise proceed serially |
| G n | If the sign of the accumulator is negative, jump to location n; otherwise proceed serially |
| I n | Read the next character from paper tape, and store it as the least significant 5 bits of location n |
| O n | Print the character represented by the most significant 5 bits of storage location n |
| F n | Read the last character output for verification |
| X | No operation |
| Y | Round the number in the accumulator to 34 bits |
| Z | Stop the machine and ring the warning bell |