The challenge is make a digital clock that exhibits ascii numbers in a 24-hour format like:
_ _ _ _
|_| |_| . |_| |_|
|_| |_| . |_| |_|
or
_ _ _
_| _| . |_| |_
|_ _| . | _|
and updates the screen every 1 minute (or every 1 second, for praticity reasons). It must reset to 00:00 after 23:59.