;;从键盘输入字符，
;;若是
小写字母
显示"This
is
Lower
case
letters."
;;若是其它字符不显示
CSEG
SEGMENT
ASSUME
CS:CSEG,DS:CSEG
MSG
DB
"
This
is
Lower
case
letters.
$"
ORG
200H
START:
MOV
AH,
01H
INT
21H
CMP
AL,
61H
JB
NODSP
CMP
AL,
7AH
JA
NODSP
DSP:
MOV
AX,
SEG
MSG
MOV
DS,
AX
MOV
DX,
OFFSET
MSG
MOV
AH,
9
INT
21H
JMP
FINISH
NODSP:
MOV
AL,
'
'
MOV
AH,
3
INT
10H
DEC
DL
MOV
AH,
2
INT
10H
MOV
AH,
0AH
INT
10H
INC
DL
MOV
AH,
2
INT
10H
JMP
START
FINISH:
MOV
AH,
4CH
INT
21H
CSEG
ENDS
END
START
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