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Write the features of Mark-I,ABC,ENIAC and UNIVAC computer.​

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Here are some key features of these early computers:

Mark I:

Electromechanical computer built in 1944

Used relay switches and rotors for computation

Could do addition, subtraction, multiplication and division

Programmed using punch cards and paper tape

Very slow, about 3-5 seconds per calculation

ABC:

First fully electronic computer, designed in 1937

Used vacuum tubes instead of mechanical parts

Could solve systems of linear equations

Programmed by rewiring the circuits

Not a stored program computer

ENIAC:

Built in 1946 for calculating artillery trajectories

Contained 17,468 vacuum tubes

Programmed by plugging cables and setting switches

Could do 5,000 additions/subtractions per second

Limited programmability and storage

UNIVAC I:

First commercial computer produced in 1951

Used vacuum tubes and magnetic tape for memory

Stored program computer with compiler

About 1,000 times faster than Mark I

Weighed 16,000 pounds and used 5,600 vacuum tubes

Used for applications like census data processing

In summary, these moved from electromechanical to electronic designs, with increasing speed, programmability and memory storage capacity over time.

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