Исправление beastie, (текущая версия) :
Вот к примеру то, что успешно летало (в частности на Philae): https://en.wikipedia.org/wiki/RTX2010
It is a two-stack machine, each stack 256 words deep each, that supports direct execution of Forth. Subroutine calls and returns only take one processor cycle and it also has a very low and consistent interrupt latency of only four processor cycles, which lends it well to realtime applications.
Исходная версия beastie, :