sirbow2:
first of all, what is the "MC74HC244AN"? what can it be used for, motor/LED controller?
It was probably used as an interface between the microcontroller and H-bridge. These Solarbotics tutorials will eat your brain for a bit.
Here's an interesting little bug that you can make with it: http://home.wanadoo.nl/m.m.avos/simple%20bot.htm