Judging from the overview, they seem to implement classical abstract machines using Ruby. Implementing something relatively simple (an abstract machine) with so

Judging from the overview, they seem to implement classical abstract machines using Ruby. Implementing something relatively simple (an abstract machine) with something complex (Ruby) is quite unilluminating. I was asking for someone who implements them using logical circuits. While also explaining how their different "power" (in terms of languages they recognize in the Chomsky hierarchy) is reflected in their logical circuits.