Assembly language for the third time

3.2 Please use the subprogram structure to write the following program: Input a two-digit decimal number of month fraction (01-12) from the keyboard, and then display the corresponding English abbreviation name.

data SEGMENT    

     january db 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec$'
     prompt db 'Please input month:$'
data ENDS

code SEGMENT
    ASSUME CS:code,DS:data      ;段分配伪指令
start:
    mov ax,data
    mov ds,ax

    lea dx,prompt       ;打印提示                  
    mov ah,9h
    int 21h

    mov dx,0AH          ;打印回车
    mov AH,02H
    int 21H

    mov ah,1
    int 21h

    mov cl,al
    sub cl,30h
    mov al,10
    MUL cl 
    mov cx,ax

    mov ah,1
    int 21h
    mov bl,al
    sub bl,30h



    add bx,cx


Disp:
    mov dx,0AH          ;打印回车
    mov AH,02H
    int 21H

    lea dx,january       ;打印提示 
    mov si,dx
    dec bx
    add bx,bx
    add bx,bx
    add si,bx

    mov dl,[si]                
    mov ah,2h
    int 21h

    inc si
    mov dl,[si]                
    mov ah,2h
    int 21h

    inc si
    mov dl,[si]                
    mov ah,2h
    int 21h

exit:
   MOV AX,4C00H
   INT 21H

    code ENDS
END start 

written in subroutine structure

data SEGMENT    

     january db 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec$'
     prompt db 'Please input month:$'
data ENDS

code SEGMENT
    ASSUME CS:code,DS:data      ;段分配伪指令
main proc far
    mov ax,data
    mov ds,ax

    lea dx,prompt       ;打印提示                  
    mov ah,9h
    int 21h

    mov dx,0AH          ;打印回车
    mov AH,02H
    int 21H

    mov ah,1
    int 21h

    mov cl,al
    sub cl,30h
    mov al,10
    MUL cl 
    mov cx,ax

    mov ah,1
    int 21h
    mov bl,al
    sub bl,30h



    add bx,cx
    call Disp
exit:
   MOV AX,4C00H
   INT 21H
main endp


Disp proc
    mov dx,0AH          ;打印回车
    mov AH,02H
    int 21H

    lea dx,january       ;打印提示 
    mov si,dx
    dec bx
    add bx,bx
    add bx,bx
    add si,bx

    mov dl,[si]                
    mov ah,2h
    int 21h

    inc si
    mov dl,[si]                
    mov ah,2h
    int 21h

    inc si
    mov dl,[si]                
    mov ah,2h
    int 21h
    ret

Disp endp

code ENDS
  END main