List of platforms supported by the C standard

Question

Does anyone know of any platforms supported by the C standard, for which there is still active development work, but which are:

• not 2\'s complement or

Answer 1

Even if these machines are ancient, there's still an active community programming for PDP-8, most but not all using simulations: PDP-8 as an example. And this machine, AFAIK, uses 12-bit integers!