with explanation please

1. The hypothetical machine discussed in class also has the following two I/O instructions, in addition to the other three 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 same format explained in class) for the following program: 1. Load AC from device 5 . 2. Add contents of memory location 940 . 3. Store AC to device 6