An Assembly Language program to convert a lowercase character to upercase

An Assembly Language program to read a lowercase character from keyboard and print it's upercase character on the screen.

♣ Try it out ::

---

.model small
.stack 100h 
.data

.code

main proc
    
    mov ax,@data
    mov ds,ax
    
    mov ah,1
    int 21h
    
    sub al,32
    
    mov bl,al
    
    mov ah,2
    mov dl,' '
    int 21h  
    
    mov ah,2
    mov dl,bl
    int 21h    
            
    mov ah,4ch
    int 21h
        
    main endp
end main

♣ Sample Input and Output ::

---

m M