TinyAcc
The tiny accumulator has four commands
| 00MM | STC M | Store Acc to location M and clear Acc |
| 01MM | ADD M | Add Acc and location M placing result in Acc |
| 10MM | SUB M | Add location M from Acc, placing result in Acc |
| 11MM | BRL M | if Acc is negative, Branch to PC+1+MM10 |