If we have a way to put logic signals into a circuit, it makes sense that we will want a way to get them out. I've gone with the tried and true method of using the logic signals to drive a collection of LEDs. A 74244 is used to buffer the signals*. LEDs are power hungry and driving them from arbitrary signals in our circuit could draw too much current and cause incorrect behaviour. Using the buffer presents a single TTL load to the circuit while at the same time providing plenty of current to make the LEDs happy.
* See a later guide in this series for more information on this handy chip.