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IBM Base Register Concepts
BASE ADDRESS REGISTER CONCEPTS
The IBM 360/50 computer knows where it is at all times. It
knows this because it knows where it isn't. By subtracting where
it is, from where it isn't; or where it isn't from where it is
(whichever is greater), it obtains a difference, or deviation.
The system uses deviations to generate corrective instructions
to take the computer from a storage position where it is,
to a position where it isn't; arriving at the position where it
wasn't, it now is. Consequently, the position where it was, is
now the position where it wasn't, and it follows that the
position where it was is the position where it isn't.
In the event the position where it is now, is not the
position where it wasn't, the system has acquired a variation,
the variation being the difference between where the computer is
and where it wasn't. However, the computer is sure where it
isn't, and it knows where it wasn't, and by differentiating this
from the algebraic difference between where it shouldn't be and
where it was, it is able to obtain the difference between its
deviation and its variation which is called ERROR!
(Thank God IBM hired technical writers.)
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