hello.asm

;author : Mrinal Pandey

.model small                    ; assembler directive to allocate memory
.data                           ; data segment
        str db "Hello World $"  ; variable str to store message to be printed
.code                           ; code segment
        mov ax, @data           ; initialize ds register
        mov ds, ax

        lea dx, str             ; load effective address of str in dx
        mov ah, 09h             ; use 09 function of int 21h
        int 21h                 ; call interrupt to print the content present at address in dx

        mov ah, 4ch             ; function to terminate with return code
        int 21h                 ; call the interrupt
        end                     ; end directive