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
Abacus - Invented in 3000 B.C.
The First portable computer was Osborn-1
Tennis For Two was the first computer game.
What was the name of the first computer that co-starred in a major motion picture?
Osborn-1
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The last famous electromechanical computer was:
The name of the first micro computer is a micro computer
Charles Babbage's adding machine in the nineteenth century
The First portable computer was Osborn-1
The first digital computer was called ENIAC
PARAM PADMA is the name of the first super computer.
mr. computer
Abacus
Wkonrad zuse made the first working computer
Tennis For Two was the first computer game.
Foreign drive
What was the name of the first computer that co-starred in a major motion picture?