把自已学号分成两个多位十进制数相加

这个是我自己写的，
DSEG SEGMENT

DATA1 DD 202317H

DATA2 DD 150636H

SUM DW ?

DSEG ENDS

SSEG SEGMENT STACK

DW 256 DUP(?)

SSEG ENDS

CSEG SEGMENT

ASSUME CS: CSEG, DS: DSEG, SS: SSEG

START: MOV AX, DSEG

MOV DS, AX

LEA SI, DATA1

MOV AX, [SI]

MOV DI, DATA2

MOV CX, [DI]

LEA BX, SUM

ADD AX, CX

MOV [BX],AX

MOV AX, [SI+2]

MOV cX, [DI+2]

ADC AX, CX

MOV [BX+2], AX

MOV AH, 4CH

INT 21H

CSEG ENDS

END START


但是DOSBOX debug会报2错误，因为还是一个学生，希望可以帮忙更正一下错误，谢谢各位