1. A Brief History
of Computers

2. in a galaxy not so far away.....
a long time ago,
in a galaxy not so far away.....

3. When man learned to count
The Prehistoric Era
15,000,000,000 BC BC
When man learned to count

4. The Prehistoric Era 300,000 BC 50,000BC to 20,000 BC
Everything had to be portable in order to survive……….
50,000BC to 20,000 BC
But once man decided to settle, they started to collect things…. And started to count

5. The Prehistoric Era continued
The first thing man used to count with were
Fingers
Latin word “Digit” refers to a finger or toe….. It also refers to a numerical quantity.
As man collected more things he had to represent them different ways….. The word calculate is from the Latin word “calculus” which means
pebble

6. The Prehistoric Era continued
3000 BC
The acabus
1900 BC
Stonehenge as
a possible calendar

7. The Prehistoric Era continued
1500 BC
The first clocks known as
water clocks
the oldest found in Egypt
300 BC
Buddists used the first written symbols for numbers

8. The Prehistoric Era continued
The first recorded use of the number “0” was at 600 AD
Interestingly Egyptians already used fractions in 5500 BC
The eye of Horus, an Egyptian deity of this time. This was used to show fractions of hekat (appr liters) a unit used to measure grain.

9. The era of calculator devices
The Era of Antiquity
The era of calculator devices

10. The Era of Antiquity
Had multiple calculator devices that had no memory and no means to output the results other than dials or indicators
Ruler with logarithmic scales made by Gunter
First calculator with rotating gears to increase the tens position
First logarithmic slide rule

11. The Pre Industrial Era 1886-1899
Calculators that have single predefined purposes.
Extra important inventions and discoveries

12. The Pre Industrial Era 1886-1899
Alexander Graham Bell makes first sound recording 1886
1887 The first key driven
adding machines were created
1888 The first calculator
which does addition,
subtraction, multiplication
and division

13. The Pre Industrial Era 1886-1899
1892 First adding machines
that also print out
Electromechanical adding
and sorting machine
(used punch cards)

14. The Pre Industrial Era 1886-1899
1898
Valdemar Poulsen invents a magnetic wire on which data can be recorded.
The principles of this invention lead to magnetic tapes and hard disk drives
Sir Joseph John Thomson discovers the electron.

15. The start of “Real” computers
The Industrial Era (1947-)
The start of “Real” computers

16. The Industrial Era (1947-) 1947 the first transistors were created
The first generation of
modern programmed
electronic computers
was built with functioning
RAM

17. The Industrial Era (1947-)
Computers required more than one floor and were huge!!!
Transistors
Burnt out often

18. The Industrial Era (1947-) 1953 First mass produced computer by IBM
Had 1 kB of RAM

19. The Industrial Era (1947-) 1958 the first integrated circuit was built
This replaced transistors on computers.
1972 the first video arcade game was created by Atari created the game Pong.

20. The Industrial Era (1947-)
1981 The first portable personal computers were available
Price $3000
IBM 5150 PC
4.77 MHz 8 bit
8088 CPU from Intel
64KB RAM,
40KB ROM,
one 5.25-inch floppy drive (160KB capacity)
"640K ought to be enough for anybody." Bill Gates

21. Sun, Compaq and Epson started in 1982
The Industrial Era (1947-)
Companies that existed 1981…..
Apple
IBM
MicroSoft
Xerox
Microsoft flight
simulator 1982
3.5” floppy by Sony (’82 – 280kB)
8” floppy disk (’71 – 79.7kB)
5.25” floppy disk (’76 – 87.5kB)
Sun, Compaq and Epson started in 1982

22. The Industrial Era (1947-) IBM generation of computers (CPU) $4000 in
8088
80286 with 8086 chip
80386
80486
$4000 in
1993
Pentium
P2, P3, P4
Dual Core
Tri & Quad Core
etc

23. The Industrial Era (1947-)
1985: Windows 1.0

24. First popular programming language in schools (1981/82) Basic

25. Resource