Abacus, slide rule, computer, calculator.
pictures of calculating devices with their inventors
The china had one with rows wooden round balls on wires, 3 rows of them, 3 balls & 3 balls =6 in the last row, that was add, to subtract it was to the left cool
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the stored programm concept
The devices could do most of the calculation work by itself
The earliest recorded calculating device is the abacus. Used as a simple computing device for performing arithmetic, the abacus most likely appeared first in Babylonia (now Iraq) over 5000 years ago.
The device used for calculating and processing data in a computer system is known as the Central Processing Unit, or CPU for short.
Texas Instruments received the patent - see relevant link below .
because that's all they had but now we have didital ones that are better
Not as we now know them. There were, however, devices for calculating and then there was the human brain ...
Pencil and paper, abacus, mechanical calculator, log tables, electronic calculator (or computer), proportional weighing machines.
Mother board , Ram and CPU are the 3 processing hardware devices of the computer. CPU is the main thing in all the three.