Reversing the numbers as required here is one of the few algorithms thats nicer in assembly than in a high level language:
When you get a digit from the divide, push it on the stack and increment a counter. At the end, do a loop, popping each digit and sending it to the output.
When you get a digit from the divide, push it on the stack and increment a counter. At the end, do a loop, popping each digit and sending it to the output.