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On 2015-08-21, at 4:03 PM, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote:
> 
>> In other words, just because the machine uses ones' complement doesn't mean
>> there's a negative 0. [...]
> 
> Is there any machine nowadays that use ones' complement?

Unisys 2200 series, I believe.

Jay