There are four buttons!

I've been trying to figure out how to get the interrupt handler on the 6502 to do what I want, and that has been an interesting lesson.

After modding the crap out of the v0.1 board to get all the pins I need that I didn't even know I needed (🤦) I hooked it up to a breadboard to set up the buttons.

From here I needed to figure out how I wanted to trigger the interrupt. I could use CA1, 2, CB1, and 2, but that would use all four interrupts, and seemed completely unnecessary.  So I started looking through the list of 74xx series chips to see if I could find something in my collection that would work