I used to program some of these beast a while ago.
There were C compilers and some UNIX port for them.

Best regards
keld

On Thu, Oct 24, 2013 at 03:40:47PM -0700, Richard Smith wrote:
> On Sat, Oct 19, 2013 at 8:51 PM, Jason Merrill <jason_at_[hidden]> wrote:
>
> > On 10/18/2013 11:15 PM, Lawrence Crowl wrote:
> > > There were machines being sold in the 90's that were not two's
> > complement, but I've lost track
> > > since then.
> >
> >
> > http://stackoverflow.com/questions/6971886/exotic-architectures-the-standard-committee-cares-about
> >
> > The Unisys machine mentioned in the top-rated answer still seems to be
> > sold.
> >
>
> Has anyone ever written a non-twos-complement C++ compiler for this machine?
> Has anyone ever written *any* non-twos-complement C++ implementation?
> And... does anyone intend to write a non-twos-complement *C++17*implementation?
>
> If the answer to these questions is "don't know", how do we find out?
> Strawman suggestion: remove non-twos-complement support from the standard
> and wait to see if anyone complains (with the intent that we would restore
> such support if there are actual complaints, not just hypothetical ones).
> The world would have nearly four years to notice and react. Thoughts?