thanks for the info!
> Today on HN I read about a tiny stack-based CPU called J1.
> This is its homepage: http://www.excamera.com/sphinx/fpga-j1.html and here is
> a more formal description: http://www.excamera.com/files/j1.pdf
As Geo said, there have been Forth CPUs around a long time. I saw the
first ones around 20 years ago. Forth is a very simple virtual machine,
which maps perfectly to hardware.
> "The J1 is probably close to the simplest possible useful CPU."
> Alexander, do you agree with that statement? Is the J1 the same as pil?
I see no similarities at all. Also, PilMCU doesn't strive particularly
for simplicity (the PicoLisp *language* does). It is rather complex,
with built-in database and garbage collection.