1. Suppose the hypothetical processor of Figure 1.3 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 external device. Show the program execution (using format of Figure 1.4) for the following program:

Load AC from device 5.

Add contents of memory location 940.

Store AC to device 6.

Figure 1.3

Figure 1.4

Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2.