The 74HC245 chips need a 5V power supply which isn't available on the board headers but is available on the USB. I "steal" this from the board by removing it's power switch and connecting a flying lead to it's 5V lines. But you have to make sure you short out the 5V and GND lines of the switch or the board won't come on any more.
It took me a while to come up with a board layout so that you can get at the buffered inputs, and the chips don't obstruct the USB socket or the jumper that's on the board. I don't normally use this double sided matrix board stuff but it seemed the only way for this project. I've used some really thin wire and a lot of connections are with 2 wires in one hole. That's a bit unorthodox, but I'm not familiar or confident with the deliberate solder-bridge method of construction these boards prefer.
The main thing to watch for here is chips and input headers on the top and the board headers on the bottom.