Question

If AL=17H, CL=34H, SS=3000H and SP=FF45H. Analyse the following assembly code snippet. What is the value of SP after the following code executes?

PUSH AL

PUSH CL POP WORDPTR[ECX]



*)FF43H

*)FF44H

*)FF45H

*)FF46H

which one correct??​

Answer 1

After the execution of the code the value of SP = FF45H

In 8086 microprocessor , PUSH command decreases the value of SP register by 2 and then write a 16-bit data at that memory.

POP increases the value of SP by 2.

If SP = FF45H

then execution of first PUSH instruction , SP =  FF43H

after executing the second PUSH instruction , SP = FF41H

then when the POP instruction will execute the value of SP will become equal to SP = FF43H

Therefore the value of SP will be FF43H.