What does the code below mean:

Question

MOV SP, 2500H
MOV AX, F3C0H
PUSH AX

Answer 1

The code is performing three different assembly language instructions:

1. MOV SP, 2500H: This instruction moves the value "2500H" (which is a hexadecimal value representing a memory location) into the Stack Pointer (SP) register. It sets the stack pointer to point to the memory location 2500H.

2. MOV AX, F3C0H: This instruction moves the value "F3C0H" (another hexadecimal value) into the Accumulator (AX) register. It stores the value F3C0H in the AX register.

3. PUSH AX: This instruction pushes the value stored in the AX register onto the stack. It moves the value F3C0H from the AX register and places it at the top of the stack.

Answer 2

What was the memory before and after PUSH AX?

Answer 3

To determine the content of memory before and after the PUSH AX instruction, we need to know the initial state of the stack.

Assuming the stack is empty before the PUSH AX instruction, the memory before the PUSH AX would be as follows:

Stack:

After executing the PUSH AX instruction, the memory would be updated as follows:

Stack:
[Top of Stack] F3C0H

So, the memory before the PUSH AX instruction was empty, and after the instruction, the value F3C0H was pushed onto the stack, becoming the topmost element.