Questions

1. Why would we need a multiplexer before the left arm of the ALU (SR2BUS, SR2MUX)? What two things are we choosing between?

2. When are the condition codes set?

3. Why would we use a flag bit in the ADD instruction instead of just creating two separate instructions? (One to perform addition of two registers and one to add a register and an immediate value)

4. Where does the select signal for SR2MUX come from?

5. Why do we need a ready signal from memory?

6. What is the purpose of the FSM in the LC-3?

7. Why is it acceptable for the ALU to perform all operations at once (ADD, AND, NOT..), even when the desired instruction is ADD?

8. How do we manage / control access to the LC-3 Reg. Bank?

9. ADD R1, R4, #-2
   When this instruction is executed, what is on the SR2bus? (What is the SR2bus?)

10. Assemble this instruction:
    x3010 LEA R6, label
x3045 label .FILL #6