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twos compliment binary

Each of its capacitor memory drums stored 30 fixed point 50 bit twos compliment binary numbers (totaling 60 numbers of roughly 14 digit precision).

Note: the ENIAC could only store 20 fixed point numbers of 10 digit precision as a comparison (using decimal numbers). Both machines could only do additions and subtractions (although ENIAC had special hardware implementing algorithms for multiplication, division, and square roots by performing sequences of additions and subtractions and was programmable to solve different problems, while the ABC performed only the single function of solving large systems of simultaneous equations).

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