Homework # 8 Due Monday,  February 23.


Redo my in class example on interfacing the MC68HC11 with an output
device using the Centronics printer interface.  Make your version interrupt
driven (I polled), and address the concerns I pointed out with your
author's solution(s).

Assume that IY points to the next byte to be printed.  You should increment
Y as part of your ISR, but need not check for "end of file" or perform other
niceties.