The abacus was and is used in many cultures, but was invented before the Chinese. The Chinese and Japanese each developed their special versions, which are still known today. In the west, the abacus eventually fell more or less out of use, but is still used in schools/pre-schools. Later, the slide rule was developed, which is a better mechanical calculator than the abacus, but without the memory. (I guess that means higher clock frequency but lower RAM?Originally Posted by Tellos Athenaios
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Apparently, the Romans didn't like using their numerals for calculations, just for representing results.
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