谁会啊，明天就要交作业了，求帮忙注释 下。

DATASEGMENT
DATDB6AH
DATAENDS
CODESEGMENT
ASSUMECS: CODE, DS: DATA
START:MOV AX, DATA
MOV DS, AX
MOV DL, DAT
MOV AL, DL
MOV CL, 4
SHR DL, CL
ADD DL, 30H
MOV AH, 02H
INT 21H
MOV DL, AL
AND DL, 0FH,
ADD DL, 37H
INT 21H
MOV AH, 4CH
INT 21H
CODEENDS
ENDSTART