StarSub:

mov ah,02h  ;needed to prime the interrupt command for printing to screen
mov ch,1    ;outer loop counter

outer_loop:
mov cl,ch   ;refresh the inner loop counter, by copying the value of the outer loop counter to it.
            ;each time the inner loop finishes, it will last one iteration longer the next time.

inner_loop:
mov dl,02Ah ;ascii for *
int 21h     ;tells DOS to print the contents of dl to the screen
dec cl
jnz inner_loop
mov dl,13   ;Carriage Return
int 21h
mov dl,10   ;New Line
int 21h

inc ch      ;make the outer loop counter bigger for next time.
cmp ch,5
jnz outer_loop

ret