1. ADC and SBB can be forced to behave exactly like ADD and SUB by inserting some other instruction before ADC and SBB. What instruction must be inserted in front of ADC to make it behave like ADD? In front of SBB to make it behave like SUB?

2. Given that you can manipulate data items on the top of stack using PUSH and POP, explain how you could modify a return address on the top of stack so that a RET instruction will cause the 80x86 to return two bytes beyond the original return address.

3. List three differences between the DEC AX and the SUB AX, 1 instructions.

4. How could you use the PUSH and POP instructions to preserve the AX register between two points in your code?