Dave: Seymour used ones complement on the 3000 and 6000 series.
Maybe there?   The primary HLLs I used on the CDC boxes were FTN and
Pascal, but I would not be surprised if that was were you saw it.


On Wed, Sep 23, 2020 at 10:26 PM Dave Horsfall <dave@horsfall.org> wrote:

> On Sun, 20 Sep 2020, Steve Nickolas wrote:
>
> > (Of course, that assumes NULL is 0, but I don't think I've run into any
> > architecture so braindead as to not have NULL=0.)
>
> I don't remember the details mow, but I recall an architecture where NULL
> was -0...  Turing save us from 1-complement machines!
>
> -- Dave
>