An abacus is a mechanical device for performing arithmetical calculations. Abaci are usually a wooden frame with beads used to represent numbers.
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abacus
The ancient Romans developed an Abacus. Blaise Pascal, however, was a French mathematical genius, and at the age of 19, he invented a machine, called the Pascaline, that could do addition and subtraction. He invented this machine to help his father, who was also a mathematician.
Tough question. The sarcastic answer would be your brain but I don't think that is what you want as an answer. If you are talking about a non-electric, mechanical machine that can add, then the first such machine would be an abacus. This was generally used in East Asian countries
An Abacus has beads and strings.
ABACUS is a name of a calculating apparatus - it is not an acronym.