@jpfli … EXT16 was repurposed to ISP mode set to allow serial programming of Pokitto
Buttons were earlier done with interrupt (7 buttons, 7 interrupts) until it became evident polling is better
That is why only 1 interrupt was available
If you use only polling buttons, you can free up all pin interrupts
D’oh! I actually had PROJ_BUTTONS_POLLING_ONLY in an earlier unpublished version, but it got lost when cleaning up / rewriting the code. Thanks for bringing that up.
Another case showing it should be the default now 
So I’m not crazy, it works just not the version I have downloaded?
The cyclometer works well with one interrupt. I just downloaded the zip file from my earlier message and tested it.
It was my attempt to add more inputs that failed.
So the current version (us units) doesn’t work but the original one from oldest post works?
Both versions work.
I’ll try it again later today.