7. The hypothetical machine of Figure 3.4 (lecture notes) also has two I/O instructions: 0011= Load AC from I/O 0111= 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 5. 2. Add contents of memory location 940. 3. Store AC to device 6. Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2. 8. The program execution of Figure 3.5 is described using six steps. Expand this description to show the use of the MAR and MBR