ASC 1.ASM

ASSUME CS:CODE
CODE SEGMENT
START:
MOV CH,04H
NEXT1:MOV SI,2000H
MOV CL,04H
NEXT:MOV AL,[SI]
     INC SI
     CMP AL,[SI]
     JC AGAIN
     MOV DL,[SI]
     MOV [SI],AL
     DEC SI
     MOV [SI],DL
     INC SI
     AGAIN:DEC CL
     JNZ NEXT
     DEC CH
     JNZ NEXT1
     INT 3
     CODE ENDS
END START