TITLE ADD TWO 8-BYTE NUMBER USING 32-BIT REGISTERS IN THE 386
  PAGE 60,132
  .MODEL SMALL
  .386
  .STACK 200H
  .DATA
  DATA1 DQ 548FB9963CE7H
  ORG 0010H
  DATA2 DQ 3FCD4FA23B8DH
  ORG 0020H
  DATA3 DQ ?
  .CODE
BEGIN:MOV AX,@DATA
  MOV DS,AX
  CLC 
  MOV SI,OFFSET DATA1 
  MOV DI,OFFSET DATA2 
  MOV BX,OFFSET DATA3 
  MOV CX,02 
BACK:MOV EAX,DWORD PTR [SI] 
  ADC EAX,DWORD PTR [DI] 
  MOV DWORD PTR [BX],EAX 
  INC SI 
  INC SI
  INC SI
  INC SI
  INC DI 
  INC DI
  INC DI
  INC DI
  INC BX
  INC BX 
  INC BX
  INC BX
  LOOP BACK 
  MOV AH,4CH
  INT 21H 
  END BEGIN