I thought Thaden would be an interesting one to look at in detail. Reading through the patent I note the following:

"Referring to FIG. 35, a microcomputer 1 which may be used with the system of the invention may include a single-chip microcomputer device 1 of conventional constructions, along with additional off-chip program or data memory 80 (if needed), and various peripheral input/output devices 81, all interconnected by an address/data bus 607, and a control bus 9."

So you can use the patented Thaden (TI) system in any old microcomputer device of conventional construction. I think that phrase conventional pretty much disembowels Thaden. IMHO Opty