几道汇编语言程序设计题，求大侠帮助

2、编写显示回车换行的子程序.
MOV DL, 0DH
MOV AH, 2
INT 21H
MOV DL, 0AH
MOV AH, 2
INT 21H
;*******************
3、试编制一个程序把BX寄存器内的二进制数用十六进制数的形式显示在屏幕上。
程序如下
;---------------------
DATA SEGMENT
x DW 1A3DH ;待显示的数字，写成二进制形式，也可
DATA ENDS
;---------------------
CODE SEGMENT
ASSUME CS: CODE, DS: DATA
START:
MOV AX, DATA
MOV DS, AX
;---------------------
MOV BX, x ;在BX中，送入数字x
MOV CH, 4
ROTATE:
MOV CL, 4
ROL BX, CL
MOV AL, BL
AND AL, 0FH
ADD AL, 30H
CMP AL, 3AH
JL PRINT
ADD AL, 07H
PRINT:
MOV DL, AL
MOV AH, 02H
INT 21H
DEC CH
JNZ ROTATE
;---------------------
MOV AH, 4CH
INT 21H

CODE ENDS
END START
;*******************
程序经过了编译，运行后显示：1A3D。

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