Ofir,

I don't know what do you mean by "simulator did not work", but you might want to clean up your code a bit.

If you call the "compare" routine, you are supposed to return from it (using ret) and not just plainly jump to the beginning - in this way you 1. don't call start_conv any more, 2. fill up the stack until it fails.

Make a simple main loop, like:

begin:
   call  start_conv
   call  compare
   jmp   begin

and make sure you return from both start_conv and compare.

Jan Waclawek

PS. Using the pre tag for formatting the posted code is more neat than your solution.