Consider the diagram below, at Figure 1. Assume the following microcode corresponds to a instruction code already loaded in memory. Assume R1 and R2 are general purpose registers and the Program Counter (PC) is at 3000. Also, assume that addresses 11000 and 11001 in main memory contain the values 31 and 64, respectively. Figure 1. Top-level view of computer components. Following the microcode, each certain set of lines correspond to an instruction.

MAR = PC, PC+1, Assert MAR IR = MBR, decodes IR put addr 11000 into MAR, Assert MAR Move MBR to R1 MAR = PC, PC+1, Assert MAR IR = MBR, decodes IR put addr 11001 into MAR, Assert MAR Move MBR to R2 MAR = PC, PC+1, Assert MAR IR = MBR, decode IR R1 = R1 + R2 MAR = PC, PC+1, Assert MAR IR = MBR, decodes IR put addr 17000 into I/O AR put R1 in I/O BR ?assert I/O AR

Use this table to help you.

Address Instruction/ data Comments 3000 3001 3002 3003 3004 3005 31 11000 11001 0 6 17000 Address Instruction/ data Comments 3000 3001 3002 3003 3004 3005 31 11000 11001 0 6 17000