Communication Technology

1
Communication Technology

• An Evolution from the Beginning of History

2
The First Communications

• Where did Communication begin?

Cavemen drew pictures about hunts and adventures
3
Written Communications

• Paintings were visual representations of events.
  Eventually symbols were used to represent events
  or characters. Those pictured below are
  ideographs.

4
Written Communications

• After picture symbols, the first civilization to
  develop a written language was the Sumerian in
  Mesopotamia. They used an information system
  called cuneiform. Even this form of written
  language developed from pictographs to symbols as
  seen in the three pictures below.

5
Evolution of Language

• The symbols of the Sumerians look very different
  from our alphabet. English letters evolved from
  Greek and Latin Letters.

6
Pen and Paper Evolution

• The Sumerians used a stylus to write into soft
  clay tablets. In about 2600 B.C., the Egyptians
  started writing on the papyrus plant.

7
Pen and Paper Evolution

• In 100 A.D. the Chinese made paper from rags, on
  which modern day papermaking is based.
• Religious leaders in Mesopotamia kept the
  earliest books
• The Egyptians kept scrolls.
• Around 600 B.C. the Greeks started folding
  papyrus leaves and bound them together.

8
The Beginning of Computing

• The first calculator was the abacus

9
Mechanical Computing

• Before the widespread use of electricity, most
  computing devices were mechanically driven, such
  as this difference engine.

10
The Electromechanical Age

• With the discovery of how to harness electricity,
  knowledge and information could be converted to
  electrical impulses.

Mark I - Paper stored data and instructions
11
Telephone and Radio

• During the electromechanical age, Alexander
  Graham Bell invented the telephone.
• Soon following, it was discovered electrical
  waves can travel through space, which led to the
  radio.

12
Electronic Age

• The Electronic Numerical Integer and Computer
  (ENIAC) was the first computer to use vacuum
  tubes, and was the first electronic computer.

13
The Four Generations of Digital Computing

• First Generation - Vacuum tubes

Most of the Computers with vacuum tubes took up
entire rooms!
14
The Four Generations of Computing

• Second Generation - Transistors

Magnetic Tape and disks began to
replace punchcards as the main storage medium.
15
The Four Generations of Computing

• Third Generation - Integrated Circuits

Punch cards become a thing of the past. Magnetic
core internal memory gives way to silcon-backed
chips.
16
The Four Generations of Computing

• Fourth Generation - Microprocessors

Microprocessors allow for personal computers to
be developed and used in the home. Original
Version of Microsoft Windows was no good - it
didnt take off until version 3. Macs first
graphical user interface debuted in 1984.