Download Investors of Early Computers

History of Computers
Teacher: Ms. Hall
Reference site: History of Computer
generation's of computer (HQ) YouTube
Investors of Early Computers
• Abacus
• The Pascaline Machine - Blaise Pascal
and Gottfried Wihelm Leibnez
• The Babbage Machine (Analytical Engine) Charles Babbage
• The Automatic Loom (Hollerith Machine)Herman Hollerith
USES OF EARLY COMPUTING
DEVICES
• Pascaline- Used by scientists and
mathematicians (additions and subtraction)
• Abacus- Used in schools, offices, shops
(calculations/payroll)
• Automatic Loom- (census)
• Analytic Engine- (calculations)
THE PASCALINE
THE ABACUS
THE AUTOMATIC LOOM
THE ANALYTICAL ENGINE
FIRST GENERATION
SECOND GENERATION
THIRD GENERATION
FOURTH GENERATION
Generation of Computers
First Generation
(1951-1958)
Second
Third
Fourth Generation
Generation (1959- Generation (1965- (1971- present)
1964)
1971)
Vacuum Tubes
Transistors
Integrated Circuits
Microprocessors
Big and Clumsy
Transistors were used
Integrated circuits
developed
Development of
portable computers
High electricity
consumption
Core memory was
developed.
Power consumption
was low.
Larger AC were
needed
Faster than first
generation computers.
Floppy disks became
the more popular
storage medium.
Lot of electricity failure
occurred.
100 times faster than
the second generation.
Super Computer
• Supercomputers – are the largest, fastest
and most powerful computers at present.
Mainframe Computers
• Mainframe
Computers are very expensive and can handle
more than hundred users at a time. They are
found in large organization such as Banks.
Microcomputer
This type of computers include; systems that
are for general purpose and for business
needs. They are usually called PC’s
(Personal Computers) based on the
microprocessor. Examples are desktop
computers, laptop, notebook etc
Mini Computers
Have become outdated and are rarely used
today. They were very popular in the 1960s.
They take up less space, may fit on a desk or
take up the space of filing cabinet.
Types of Computer
Characteristics
/Features
Supercomputer Microcomputer
Mainframe
Minicomputer
Design or
Architecture
Developed by
International
Business. They
are equivalent to
two basketball
courts.
Mainframes
vary in size .
They are small, they can
fit on a desk or be as
big as a large filing
cabinet
Speed at which
instructions are
carried out
It’s the fastest,
most powerful and
most expensive
computer currently
available.
They process
data at millions
of instructions
per second. It
can process a
number of
applications at
the same time
Amount of main
memory
The main memory
is measured in
million of bytes.
They store
millions of
bytes,
Microcomputer also
known as personal
computers
THE END