;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;                                                                   ;
;   Use .stack,.data,.code directivs to define segment types        ;
;   Also use .medium to define code model                           ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
          .model medium
          .stack 100h        ; reserve 256 bytes of stack space
          
          .data           
dos_print EQU 9                        ;define a constant
strng     DB  'Hello World',13,10,'$'  ;Define the character string


          .code
      
START:    mov ax, SEG strng           ;ax <-- data segment start address
          mov ds, ax                  ;ds <-- initialize data segment register
          mov ah, dos_print           ;ah <-- 9 DOS 21h string function
          mov dx,OFFSET strng         ;dx <-- beginning of string
          int 21h                     ;DOS service interrupt
          mov ax, 4c00h               ;ax <-- 4c DOS 21h program halt function
          int 21h                     ;DOS service interrupt

END       START


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