A Burroughs
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Old 12-24-2015   #1
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Default A Burroughs

When was last time you seen one of these - I remember them

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Old 12-26-2015   #2
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I remember the newer electrical version of these, but it had only one set of numeric keys rather than one set for each column as this one does. Like the mechanical version shown here, they were big, slow by today's standard, heavy, and noisy as all getout. That was pretty much the standard office calculator of the late 1960s and early 1970s. The one in chemistry lab took the better part of a minute to divide 999...999 by one, using a repeated subtract and shift. Multiplications were only a little faster and the machine put out quite a racket the whole time it was working on a problem. The physics lab also had what used to be called a comptometer, very much like the like in this image but which had something like 15 to 20 columns - I dont remember exactly, that had no special sign indication but instead represented negative numbers in what computer people call nine's complement notation. You had to subtract the result from 1 followed by as many zeroes as you had columns on your machine to get the magmitud of the (negative) number represented.


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