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.MODEL SMALL
.STACK 100H
.CODE
MAIN PROC 
    
    CALL P1
    
    MOV DL,51
    MOV AH,2
    INT 21H
    
    MOV AH,4CH
    INT 21H
    MAIN ENDP

P1 PROC
    
    CALL P2
    
    MOV DL,52
    MOV AH,2
    INT 21H 
    
    RET
    
    P1 ENDP

P2 PROC
    
    MOV DL,53
    MOV AH,2
    INT 21H 
    
    RET
    
    P2 ENDP
END MAIN