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Date: Mon, 10 Jul 2006 22:56:18 -0700
From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
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Subject: Re: Ada vs Fortran for scientific applications
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Date: 2006-07-10T22:56:18-07:00
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robin wrote:

> glen herrmannsfeldt wrote in message <5rSdnTfTP7NHEyzZnZ2dnUVZ_tidnZ2d@comcast.com>...

>>For signed integer types, most, if not all, allow twos complement,
>>ones complement, or sign magnitude representation.

> Virtually all use twos complement for negative values.
> Few ever used ones complement anyway.  They were a PITA.

CDC used ones complement, and as I understand it Univac still does.

The last sign magnitude binary machine I know of is the 7090.

S/360 and successors use sign magnitude for fixed point decimal
arithmetic.  I don't know of any nines complement machines,
but there probably were some along the way.

-- glen