The hypothetical machine of Figure 3.4 (lecture notes) also has two I/O instructions: 0101 = Load AC from I/O 0110 = Store AC to I/O In these cases, the 12-bit address identifies a particular I/O device. Show the program execution (using the format of Figure 3.5) for the following program: 1. Load AC from device 3. 2. Add contents of memory location 940. 3. Store AC to device 7 Assume that the next value retrieved from device 3 is 5 and that location 940 contains a value of 9