Adding machines have not always had a minus key. To subtract the=20
operator would "9 it out".
  Suddenly I feel old and tired...

On 3/2/2015 1:59 PM, James Newton wrote:
> "Subtracting is NOT adding plus a bit."
>
> (one of my very favorite double entendres)
>
> This was my attempt to explain it (see "Advanced" and the comment on the
> bottom)
> http://techref.massmind.org/techref/logic/sub5.htm

--=20
John Ferrell W8CCW
    Julian NC 27283
  It is better to walk alone,
than with a crowd going the wrong direction.
                   --Diane Grant


--=20
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