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Birth of

Computers Generation 0Mechanical Calculating Machines

Generation 1Vacuum tube Computers

Generation 2 - Transistors

Generation 3Integrated Circuits

Generation 4Very Large Scale Integrated Circuits (VLSI)

Generation 5the Future

Generation 0 (zero)Generation zero was from 1600 to 1936. This entire generation consisted of mechanical

machines that could do various functions.

This generation began in the early 17th

Century where John Napier mechanized the

multiplication tables/logarithmic.

The calculating clock was then invented around 1617 by Wilhelm Schikard which marked

the beginning of mechanical calculators.

In 1642, Blaise Pascal invented the Pascaline an adding machine.

The major breakthrough came from Gottfried Wilhelm von Leibniz who invented the

Leibniz Step Reckoner which could add, subtract, multiply, divide and square root

functions.

von Leibniz was the man who came up with differential calculus, first to study binary

arithmetic at any length and developed the more complicated adding machine, the

Leibniz Step Reckoner.

Then in 1804, Joseph-Marie Jacquard invented the Jacquards Punch Card Loom which

used punch cards to operate the looms.

Now, let me remind you that in the 80s and predominantly in the 70s punch cards

were very common with computers, even during programming.

Charles Babbage is probably the most common inventors in the late 1800 developing a

number of interesting machines:

Difference Engine

Analytical EngineNow the difference engine was developed in 1822 and was used to calculate tables of

values of polynomials using the finite differences method.

The analytical engine, the more famous of the two machines invented was created in

the year 1833. Now this engine was perhaps the core of what is in todays modern

computers.

This engine had three main components

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The mill

An arithmetic processing unit

Store

A type of memory (like the cache memory or main memory)

Input & Output devices (I/O)

Input via punch cardsI may not have mentioned this, but the primary functions of a computer is to fetch,

decode and execute instructions.

Now, this engine is similar to the functions of a modern day computer.

To all women out there, I have to admit that it is a great honour to let you all know that

a lady was the first programmer and her name was Ada Lovelace.

Therefore - a round of applause to all women out there for a great achievement in

history and in the 1800s.

In the 1890s, Herman Hollerith invented the tabulating machine which was developed

for the United States census.

It used punch cards as its main mechanism, and the machine was used to analyse the

United States census data.

An interesting milestone here is that Hollerith then founded the Tabulating Machine

Company in 1896 and this company merged with others to form IBM in the year 1924.

Generation 1 (One)The first generation computers were based on vacuum tubes.

In 1936, Alan Turing developed the Turing machine which worked on the principles of

moving from one state to another state using a set of rules depending on a symbol it

read from the tape. This allowed it to write a symbol on a tape or delete a symbol from

a tape.

From 1936-1941, Konrad Zuse developed the Z1-Z3 machines. These were the first

general purpose program controlled computer.

The machines were built with mechanical relays for control and memory. The programs

were punched into old movie film.

1937 was the launch of ABC (Atanasoff Berry Computer). This was the first completely

electronic computer that were built to solve systems of linear equations.

These computers were constructed using vacuum tubes.

Harvard Mark 1 was built in 1943 which was the first electro-mechanical digital

computer in the United States.

It was built consisting of electromagnetic relaysmagnets which open and close and act

as metal switches.

Programming was done on punched paper tape and consisted of 1 million parts takingup 50ft of space in length and 8ft in height.

This machine was capable of 323 decimal-digit additions per second and could store

7323 digit numbers.

ENIAC was built in 1946 and the EDVAC in 1951. These two inventions were

implemented by Eckert, Mauchly and Von Neumann.

The ENIAC had 18000 vacuum tubes and took up 1800 square feet, could do 5000

additions per second and had a memory capacity of 1000bits in what is 125 bytes.

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The ENIAC was programmed by wire plugs into panels and was fully electronic and

programmable. However, it required many wires to get the job done.

The EDVAC instead was an Electronic Discrete Variable Automatic Computer which was

fully programmable.

The difference between the ENIAC and EDVAC is that the EDVAC was programmed on

binary (base 2) representations whereas the ENIAC used decimals (base 10).It was also equipped with a CRT display monitor and had programs stored within its

memory.

Generation 2 (Two)The start of Generation 2 was marked with the invention of transistors by William

Shockley, John Bardeen and Walter Brattain.

The early DEC computers were equipped with transistors instead of vacuum tubes.

Transistors acted as a gate switch which consisted of the on and off methodology,

where on represented 1 and off represented 0.

During the second generation, programming moved from machine language to assembly

language. It also marked the development of high level languages such as COBOL (1959)and FORTRAN (1954).

Third Generation (Generation 3)The third generation began with the development of ICs (Integrated Chips) which were

electronic circuits on a silicon based chip.

The IBM 360 was one of the first to run on ICs and was the first multi-programmable

machines.

This was followed by the DEC PDP 8 in 1965 which sparked the minicomputer

revolution.

In 1976 however, Cray-1 was launched bearing the heavy weight title: Supercomputer.

The Fourth GenerationThe fourth generation marked more advances in the computer industry with thedevelopment of Very Large Scale Integrated Circuits (VLSI).

These circuits consisted of more than 10000 components per chip and led to the

development of the first microprocessor, the Intel 4004 in 1971.

From then on, manufacturers such as Altair, IBM, Macintosh started developing

processors for their range of computers.

That has not stopped until now, of course some of the manufacturers are now gone

replaced by much bigger companies such as Intel and AMD.

IBM and Apple continue to have their own brand of computers but not necessarily

running on their own processors.

Fifth GenerationThe future is the fifth generation and though we are already in the fifth generation, it is

a long way to go.

The fifth generation consists of

Artificial intelligence

Quantum computing

Nanotechnology

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