ABC, the first electronic digital computer, was invented by John v. Atanasoff and his assistant Clifford Berry during 1937-1942.

It consisted of 18000 valves and other45 valves with wires.

It was build for calculation of difficult equations and other mathematical equations.

Its main features are as follows:

it uses binary digits to represent all numbers and data.

Organizing a system in which computation and memory are separated.

Performing all calculations using electronics rather than wheels, ratchets, or mechanical switches.

picture credit:slideplayer.comThis machine was the first to store a change on a capacitor, which is how today computers store information in their main memory (RAM).

It used 45 vacuum tubes for internal logic and capacitors for storage.

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