(15 points) The following is the hypothetical machine of Figure 3.4 0 15 Opcode Address (a) Instruction format 0 15 Magnitude (b) Integer format Program counter (PC) = Address of instruction instruction register (IR) = Instruction being executed Accumulator (AC) Temporary storage (c) Internal CPU registers 0001 Load AC from memory 0010 Store AC to memory 0101-Add to AC from memory (d) Partial list of opcodes Figure 3.4 Characteristics of a Hypothetical Machine Consider this machine also has two I/O instructions: 1 100-load AC from ?? 11 10 = store AC to 10 In these cases, the 12-bit address identifies a particular device. Show the program execution using the format of Figure 3.5 for the following program: 1. Load AC from device 0x1A. 2. Add contents of the memory location 0x7CID 3. Store AC to device 0x1B Assume that the next value retrieved from device Ox1A is OxFF and that location 0x7CD contains a value of 0x1. Assume the instructions are stored at address 0x300, 0x301, 0x302