Urgent help !!

[Alerwiali]

This program suppose to take number of rows and print a triangle of stars like this:
How many row for the triangle? =  12

           *
          ***
         *****
        *******
       *********
      ***********
     *************
    ***************
   *****************
  *******************
 *********************
***********************


Please help with no much modification if possible !!

;Assembly Version

.model small 
.stack 
.data 
 msg1      db 'How many rows for the traingle? : $'
 msg2      db 'Error: too many cols !! $'
 nrow      db ? 
 mult      db 2
 var       dw 80 
 ncol      dw ?
.code 
.startup 
   mov ax,@data
   mov ds,ax
   
   xor si,si 
   xor bx,bx 
   
   ;prompt the user to enter number of rows 
   
   mov dx,offset msg1
   mov ah,09h
   int 21h 
   
  ;read number of rows
   mov ah,01h
   int 21h 
   sub al,30h
   mov nrow,al
   cbw
   mov cx,ax
    
   ;calculate number of coulms 
   mul mult
   sub ax,1
   mov ncol,ax
       
   ;check validity of number of cols 
   cmp ax,var 
   jge error  
   
   ;print in new line 
   mov dl,10d
   mov ah,02h
   int 21h
   mov dl,13d
   mov ah,02h
   int 21h   
      
      
      mov al,nrow 
      
      
          
outerLoop:
       add  bl,1
       xor  dl,dl
       sub  nrow,bl 
       jmp  condition1
              
condition1: 
           call printspace 
           add dl,1 
           cmp dl,nrow
           
             jle condition1
             
           xor dl,dl
           
           mov al,bl
           mul  mult
           add dl,1
           jmp condition2 
           
           

condition2:
           call printstare
           add dl,1
           
           cmp dl,al
            
           jl condition2
              
             ;print in new line 
              mov dl,10d
              mov ah,02h
              int 21h
              mov dl,13d
              mov ah,02h
              int 21h
               
              loop outerLoop
           
              jmp finish
           
           
error:
    mov dx,offset msg2
    mov ah,09h 
    int 21h 
     jmp finish  
     
     
 finish :
        mov ah,4ch 
        int 21h 
              
     
printspace:
      push ax
      push bx
      push cx
      push dx 
      
      mov dl,' '
      mov ah,02h 
      int 21h  
      
      pop  dx
      pop  cx
      pop  bx
      pop  ax
    ret 

 printstare:
      push ax
      push bx
      push cx
      push dx 
      
      mov dl,'*'
      mov ah,02h 
      int 21h  
      
      pop  dx
      pop  cx
      pop  bx
      pop  ax
    ret 
  
END