In assembly language we must have a mechanism to call the operating system to carry out I/O. In addition we must be able to tell the operating system what kind of I/O operation we wish to carry out, e.g. To read a character from the keyboard, to display a character or string on the screen or to do disk I/O.
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Assembly Language Program To Read A String And Display Two
Write an assembly program to READ YOUR NAME AND DISPLAY IT IN NEWLINE
title read and display name
dosseg
.model small
.stack 100H
.code
main proc
mov ax, @data ; initialize ds register
mov ds, ax
mov ah, 09h ; display message1
mov dx, offset msg1
int 21h
mov ah, 0ah ; read string
mov dx, offset string
int 21h
mov alt, 09h ; your name is
mov dx, offset msg2
int 21h
mov ah, 09h ; string output
mov dx, offset string
int 21h
mov ax, 4C00H ; return to DOS
int 21H
main endp
end main
.data
msg1 db “Enter your name $”
msg2 db “OAH, ODH, your name is $”
max db 20
len db ?
string db 20 DUP(‘$’)