Question

1. Given the data definitions,

W DW 1234

A DB 23

B DB -12

2. what is displayed by the DOS display string call

mov dx, OFFSET Msg

mov ah, 9h

int 21h

Answer 1

Greetings!!

mov dx, OFFSET Msg

mov ah, 9h

int 21h

This code is used to diplay the content of the string named Msg on to the screen.

Complete code:

org 100h

.data              ;data segment

W DW 1234    ;declare 2 bytes in memory with variable name W and initial value of 1234

A DB 23          ;declare 1 byte in memory with variable name A and initial ;value of 23

B DB -12        ;declare 1 byte in memory with variable name B and initial ;value of -12

Msg db "Good Morning!!$"    ;declare a string with name Msg and initialized with ;message Good Morning!!

.code                                       ;code segment

mov ax,@data

mov ds,ax     

mov dx, OFFSET Msg          ;load the address of the string Msg into the register DX ;for displaying to the screen using DOS system call

mov ah, 9h                             ;parameter for system call for displau=ying the string. ;Each DOS service need a parameter loaded into the AH register before the system ;call   

int 21h                                    ;calling DOS system call for displaying the string

hlt                                           ;terminate the execution

ret

Screenshots:

Hope this helps