新手上路。求指导

知道有错但是不会修改。请高手指导下。谢谢！！

;FILENAME:EXA121.ASM
.486
DATA SEGMENT USE16
MESG DB      'HELLOW'
     DB      0,0,0
DATA ENDS
CODE SEGMENT USE16
     ASSUME  CS:CODE,DS:DATA
SLX: MOV     AX,DATA
     MOV     DS,AX
     MOV     ES,AX
     MOV     CX,5
LL1: MOV     MESG+5,0
     MOV     MESG+6,0
     MOV     MESG+7,0
     LOOP    DISP
     MOV     AH,4CH
     INT     21H
DISP PROC
     MOV     AH,9
     MOV     DX,OFFSET MESG
     INT     21H
     RET
DISP ENDP
CODE ENDS
     END     SLX

ml.exe /c /coff /nologo /Fo"test1.obj" "E:\huibian\TASM\test1.asm"
 Assembling: E:\huibian\TASM\test1.asm
E:\huibian\TASM\test1.asm(9) : error A2004: symbol type conflict
E:\huibian\TASM\test1.asm(26) : warning A4023: with /coff switch, leading underscore required for start address : SLX