I just try blocky prop.
I want to motivate kids for programing.
I bump in to a question very fast.
My test platform has a 6Mhz X-tall, so firs try I get nothing.
When I realize this, I do not find the place to change the "_xinfreq" inside the bloke prop system.
Ends up by swap the crystal on the board to a common 5Mhz.
There must be a soft solution hidden ...