CHESKA GALANO ACT-NET 1 / SECTION V

THE HISTORY OF COMPUTER

The first counting device was used by the primitive people. They use sticks, stones and
bones as counting tools. As human mind and technology improved with time more
computing devices were developed. Some of the popular computing devices starting with
the first to recent ones are

Abacus

The history of computer begins with the birth of abacus which is believed to be the first
computer. It is said that Chinese invented Abacus around 4,000 years ago. It was a
wooden rack which has metal rods with beads mounted on them. The beads were moved
by the abacus operator according to some rules to perform arithmetic calculations.
Abacus is still used in some countries like China, Russia and Japan.

Napier’s Bones

It was a manually-operated calculating device which was invented by John Napier (1550-
1617) of Merchiston. In this calculating tool, he used 9 different ivory strips or bones
marked with numbers to multiply and divide. So, the tool became known as “Napier’s
Bones. It was also the first machine to use the decimal point.

Pascaline

Pascaline is also known as Arithmetic Machine or Adding Machine. It was invented

between 1642 and 1644 by a French mathematician-philosopher Biaise Pascal. It is
believed that it was the first mechanical and automatic calculator. Pascal invented this
machine to help his father, a tax accountant. It could only perform addition and
subtraction. It was a wooden box with a series of gears and wheels. When a wheel is
rotated one revolution, it rotates the neighboring wheel. A series of windows is given on
the top of the wheels to read the totals.
Stepped Reckoner or Leibnitz wheel

It was developed by a German mathematician-philosopher Gottfried Wilhelm Leibnitz in

1673. He improved Pascal’s invention to develop this machine. It was a digital mechanical
calculator which was called the stepped reckoner as instead of gears it was made of fluted
drums.

Difference Engine

In the early 1820s, it was designed by Charles Babbage who is known as “Father of
Modern Computer”. It was a mechanical computer which could perform simple
calculations. It was a steam driven calculating machine designed to solve tables of
numbers like logarithm tables.

Analytical Engine

This calculating machine was also developed by Charles Babbage in 1830. It was a
mechanical computer that used punch-cards as input. It was capable of solving any
mathematical problem and storing information as a permanent memory.

Tabulating Machine

It was invented in 1890, by Herman Hollerith, an American statistician. It was a mechanical

tabulator based on punch cards. It could tabulate statistics and record or sort data or
information. This machine was used in the 1890 U.S. Census. Hollerith also started the
Hollerith’s Tabulating Machine Company which later became International Business
Machine (IBM) in 1924.

Differential Analyzer

It was the first electronic computer introduced in the United States in 1930. It was an
analog device invented by Vannevar Bush. This machine has vacuum tubes to switch
electrical signals to perform calculations. It could do 25 calculations in few minutes.

Mark I

The next major changes in the history of computer began in 1937 when Howard Aiken
planned to develop a machine that could perform calculations involving large numbers. In
1944, Mark I computer was built as a partnership between IBM and Harvard. It was the
first programmable digital computer.
Generations of Computers

A generation of computers refers to the specific improvements in computer technology

with time. In 1946, electronic pathways called circuits were developed to perform the
counting. It replaced the gears and other mechanical parts used for counting in previous
computing machines.

In each new generation, the circuits became smaller and more advanced than the
previous generation circuits. The miniaturization helped increase the speed, memory and
power of computers. There are five generations of computers which are

First Generation Computers

The first generation (1946-1959) computers were slow, huge and expensive. In these
computers, vacuum tubes were used as the basic components of CPU and memory.
These computers were mainly depended on batch operating system and punch cards.
Magnetic tape and paper tape were used as output and input devices in this generation;

Some of the popular first generation computers are;

• ENIAC (Electronic Numerical Integrator and Computer)

• EDVAC (Electronic Discrete Variable Automatic Computer)
• UNIVACI(Universal Automatic Computer)
• IBM-701
• IBM-650

Second Generation Computers

Computers used transistors which were cheap, compact and consuming less power; it
made transistor computers faster than the first generation computers. In this generation,
magnetic cores were used as the primary memory and magnetic disc and tapes were
used as the secondary storage. Assembly language and programming languages like
COBOL and FORTRAN, and Batch processing and Multiprogramming operating systems
were used in these computers.
Some of the popular second generation computers are;

• IBM 1620
• IBM 7094
• CDC 1604
• CDC 3600
• UNIVAC 1108

Third Generation Computers

The third generation computers used integrated circuits (ICs) instead of transistors. A
single IC can pack huge number of transistors which increased th power of a computer
and reduced the cost. The computers also became more reliable, efficient and smaller in
size. These generation computers used remote processing, time-sharing, multi
programming as operating system. Also, the high-level programming languages like
FORTRON-II TO IV, COBOL, PASCAL PL/1, ALGOL-68 were used in this generation.

Some of the popular third generation computers are;

• IBM-360 series
• Honeywell-6000 series
• PDP(Personal Data Processor)
• IBM-370/168
• TDC-316

Fourth Generation Computers

The fourth generation (1971-1980) computers used very large scale integrated (VLSI)
circuits; a chip containing millions of transistors and oth circuit elements. These chips
made this generation computers more compact, powerful, fast and affordable. These
generation computers used real time, time sharing and distributed operating system. The
programming languages like C, C++, DBASE were also used in this generation.
Some of the popular fourth generation computers are;

• DEC 10
• STAR 1000
• PDP 11
• CRAY-1(Super Computer)
• CRAY-X-MP(Super Computer)

Fifth Generation Computers

In fifth generation (1980-till date) computers, the VLSI technology was replaced with ULSI
(Ultra Large Scale Integration). It made possible the production of microprocessor chips
with ten million electronic components. This generation computers used parallel
processing hardware and Al (Artificial Intelligence) software. The programming languages
used in this generation were C, C++, Java,.Net, etc.

Some of the popular fifth generation computers are;

• Desktop
• Laptop
• NoteBook
• UltraBook
• ChromeBook