DATA SEGMENT
A DW 0001H,0002H
DATA ENDS
CODE SEGMENT
         ASSUME DS:DATA,CS:CODE
START:
        MOV AX,DATA
        MOV DS,AX
        MOV AX,A
        ADD AX,A+2
        MOV AH,4CH
        INT 21H
CODE ENDS
END START

;OUTPUT:->
;
;-r
;AX=0000  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0B98  ES=0B98  SS=0BA8  CS=0BA9  IP=0000   NV UP EI PL NZ NA PO NC
;0BA9:0000 B8A80B        MOV     AX,0BA8
;-t
;
;AX=0BA8  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0B98  ES=0B98  SS=0BA8  CS=0BA9  IP=0003   NV UP EI PL NZ NA PO NC
;0BA9:0003 8ED8          MOV     DS,AX
;-t
;
;AX=0BA8  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0BA8  ES=0B98  SS=0BA8  CS=0BA9  IP=0005   NV UP EI PL NZ NA PO NC
;0BA9:0005 A10000        MOV     AX,[0000]                          DS:0000=0001
;-t
;
;AX=0001  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0BA8  ES=0B98  SS=0BA8  CS=0BA9  IP=0008   NV UP EI PL NZ NA PO NC
;0BA9:0008 03060200      ADD     AX,[0002]                          DS:0002=0002
;-t
;
;AX=0003  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0BA8  ES=0B98  SS=0BA8  CS=0BA9  IP=000C   NV UP EI PL NZ NA PE NC
;0BA9:000C B44C          MOV     AH,4C
;-t
;
;AX=4C03  BX=0000  CX=0020  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
;DS=0BA8  ES=0B98  SS=0BA8  CS=0BA9  IP=000E   NV UP EI PL NZ NA PE NC
;0BA9:000E CD21          INT     21