When the button

at P$1\mathrm{.}0$ is pressed, a subprogram named "addition" will be called, and when the button at P$1\mathrm{.}2$ is pressed, a subprogram named

"multiply" will be called.

In the "add" subroutine, N$1+$N$2$ will be calculated, and in the "multiply" subroutine, N$1$xN$2$ will be calculated. The results will be

stored in P$2.$ Here, N$1$ is stored in bank$1\text{'}$s R$0$ and N$2$ is stored in bank$2\text{'}$s R$0.($Assume that the result of the operations does not

exceed FFh$.)$

$4-$ Bir