1. Consider the hypothetical machine: Instruction Format: 16 bits (bits 0 to 3 for the opcode; 4 to 15 for the address) (a) Integer Format: sign magnitude (bit 0 for the sign; 1 to 15 for the magnitude) (b) Integer Format 2's complement PC: Program Counter IR: Instruction Register AC: Accumulator Partial list of opcodes: 0001 Load AC from memory 0010 Store AC into memory 0100 Add AC and Ri, result will be in AC 0101 Add AC with the content at memory address, result will be in AC 0111 Load register R1 from memory 0110 Load AC from I/O buffer 1000 Store AC into I/O buffer 1001 Move R1 to AC 1010 Move AC to R1 The code starts at address (AEQH and data at address (B72)H. a. Write a program that: (1) loads data from memory into accumulator; (2) adds the content of accumulator with the content at the variable at the memory address (B72) H, (3) moves the content of accumulator to R1, (4) loads the content of the accumulator from address (B73) H, (5) adds data from accumulator and register 1, and (6) store the result from accumulator into the I/O buffer. b. Solve the problem in two situations considering that your data is (a) 64 and (-20) in decimal represented in sign magnitude and (b) in 2's complement. c. Trace the execution. 1. Consider the hypothetical machine: Instruction Format: 16 bits (bits 0 to 3 for the opcode; 4 to 15 for the address) (a) Integer Format: sign magnitude (bit 0 for the sign; 1 to 15 for the magnitude) (b) Integer Format 2's complement PC: Program Counter IR: Instruction Register AC: Accumulator Partial list of opcodes: 0001 Load AC from memory 0010 Store AC into memory 0100 Add AC and Ri, result will be in AC 0101 Add AC with the content at memory address, result will be in AC 0111 Load register R1 from memory 0110 Load AC from I/O buffer 1000 Store AC into I/O buffer 1001 Move R1 to AC 1010 Move AC to R1 The code starts at address (AEQH and data at address (B72)H. a. Write a program that: (1) loads data from memory into accumulator; (2) adds the content of accumulator with the content at the variable at the memory address (B72) H, (3) moves the content of accumulator to R1, (4) loads the content of the accumulator from address (B73) H, (5) adds data from accumulator and register 1, and (6) store the result from accumulator into the I/O buffer. b. Solve the problem in two situations considering that your data is (a) 64 and (-20) in decimal represented in sign magnitude and (b) in 2's complement. c. Trace the execution