.MODEL      SMALL
            .STACK      64
            .DATA
Data1       DQ          548FB9963CE7H
            ORG         0010H
Data2       DQ          3FCD4FA23B8DH
            ORG         0020H
Data3       DQ          ?
            .CODE
Main:       mov         AX,@DATA
            mov         DS,AX
            CLC
            mov         SI,OFFSET Data1
            mov         DI,OFFSET Data2
            mov         BX,OFFSET Data3
            mov         CX, 4
AddWord:    mov         AX,[SI]
            ADC         AX,[DI]
            mov         [BX],AX
            inc         SI
            inc         SI
            inc         DI
            inc         DI
        inc         BX
            inc         BX
            loop        AddWord
            mov         AH,4CH
            int         21H
            END         Main