CPU 8086

Question

ORG 0400H

SECTION CODE:

MOV AX, 0460H
MOV SP, AX

MOV AX, 1
MOV BX, 2
MOV CX, 3
MOV DX, 4
MOV WORD[DATA1], 7

PUSH AX
PUSH BX
PUSH CX
PUSH DX

INT3

POP AX
POP BX
POP CX
POP DX
POP WORD [SUM]
INT3

SECTION DATA:
DATA1 DW 7,9,10,11,12

SECTION BSS:
SUM DW 3

Demonstrate the following:
1) Run the program. It will run up to the first INT3 (break point). at this time, show and write the content of stack, register, and variables.
2) comment out the first INT3. Run the program again. At this time, show and write the content of stack, registers, and variables

Answer 1

1) Before the first INT3 (break point):

Content of stack:
- SP: 0460H (points to the top of stack)
- Top of stack: 0000H (empty)

Content of registers:
- AX: 0000H
- BX: 0000H
- CX: 0000H
- DX: 0000H

Content of variables:
- DATA1: 7,9,10,11,12
- SUM: 3

2) After commenting out the first INT3 and running the program again:

Content of stack:
- SP: 0462H (points to the top of stack)
- Top of stack: 0000H (empty)

Content of registers:
- AX: 0001H
- BX: 0002H
- CX: 0003H
- DX: 0004H

Content of variables:
- DATA1: 7,9,10,11,12
- SUM: 3