The lab computer will execute a program, instruction by instruction, when you give the command step in the console window. Use this command and execute the program step by step, and inspect what happens with the registers and program counter after each step. Try to record and explain the execution of two of the example programs above

Sure, let me explain and record the execution of two example programs step by step.

Example 1: Addition Program

Code:

LOAD R1, 5
LOAD R2, 7
ADD R3, R1, R2

Execution Steps:
1. The program counter (PC) starts at 0, which points to the first instruction.
2. The instruction `LOAD R1, 5` is executed, which loads the value `5` into register `R1`.
3. The PC is incremented to 1, which points to the next instruction.
4. The instruction `LOAD R2, 7` is executed, which loads the value `7` into register `R2`.
5. The PC is incremented to 2, which points to the next instruction.
6. The instruction `ADD R3, R1, R2` is executed, which adds the values in registers `R1` and `R2`, and stores the result in register `R3`.
7. The PC is incremented to 3, which points to the next instruction.
8. The program terminates.

Registers:
- Before execution:

R1: 0
R2: 0
R3: 0

- After execution:

R1: 5
R2: 7
R3: 12

Example 2: Loop Program

Code:

LOAD R1, 10
LOAD R2, 0
LOOP:
ADD R2, R2, 1
SUB R1, R1, 1
BNE R1, 0, LOOP

Execution Steps:
1. The program counter (PC) starts at 0, which points to the first instruction.
2. The instruction `LOAD R1, 10` is executed, which loads the value `10` into register `R1`.
3. The PC is incremented to 1, which points to the next instruction.
4. The instruction `LOAD R2, 0` is executed, which loads the value `0` into register `R2`.
5. The PC is incremented to 2, which points to the next instruction.
6. The label `LOOP` is encountered, which does not affect the PC.
7. The instruction `ADD R2, R2, 1` is executed, which adds `1` to the value in register `R2`.
8. The PC is incremented to 3, which points to the next instruction.
9. The instruction `SUB R1, R1, 1` is executed, which subtracts `1` from the value in register `R1`.
10. The PC is incremented to 4, which points to the next instruction.
11. The instruction `BNE R1, 0, LOOP` is executed, which checks if the value in register `R1` is equal to `0`. Since it is not, the PC is set to the address of the label `LOOP`.
12. The program returns to step 6 and repeats the loop until the value in register `R1` becomes `0`.
13. When the loop terminates, the PC is incremented to 5, which points to the next instruction.
14. The program terminates.

Registers:
- Before execution:

R1: 0
R2: 0

- After execution:

R1: 0
R2: 10