Debouncing the pushbuttons is fine but what we really need for most of the pushbuttons from a front panel is toggling lines. When a button is pressed it should toggle the state of the bit that was pressed.

Got this working and created a branch in GitHub. This uses the same IOP16 program (FP01_LOOP2) as the previous log. It still loops back the toggled pushbuttons back to the LEDs.

And it works.