Question: Extend the JSR and RET instructions of Problems to allow nested subroutine calls. That is, a subroutine can call another subroutine. Then the returns from the subroutines will be in a last-in-first-out order. Use a stack in your design.
Problem: Write register transfer sequences for the following new instructions: JSR: Subroutine jump; use memory location 0 for storing the return address. RET: Return from subroutine.