This topic discusses the brief historical development of computers

1. HISTORICAL DEVELOPMENT OF COMPUTERS
PRE-COMPUTING TO 19TH
CENTURY COMPUTING DEVICES
 ABACUS
ANALYTICAL
ENGINE

2. ABACUS
This is an ancient calculating
device made from frames
and beads used for addition
and subtraction of numbers.

3. NAPIER’S BONE
This was created by John
Napier. It is used for
arithmetic operations. It
consists of a board and a rim
and could be used to perform
multiplication and division of
binary numbers.

4. SLIDE RULE
WILLIAM OUGHTRED
It could be used to perform multiplication,
division, powers, addition, subtraction and root.
It is a movable scale that is calibrated to enable
calculations by gliding on the ruler

5. PASCALINE(Blaise Pascal)
Blaise Pascal built the first mechanical
adding machine known as Pascal’s calculator
or pascaline. It was capable of performing
addition and subtraction of numbers.

6. LEIBNIZ ENGINE (Von Leibniz)
Gottfried Leibniz invented the
mechanical multiplier. It was capable
of performing multiplication of
numbers using drums and cogs.

7. JACQUARD’S LOOM (Joseph Jacquard)

8. DIFFERENCE ENGINE/
ANALYTICAL ENGINE

9. HISTORICAL DEVELOPMENT OF COMPUTERS
20TH
CENTURY COMPUTING DEVICES
 LAPTOP
 HOLLERITH TABULATOR

10. HOLLERITH TABULATOR(Herman
Hollerith)
Hollerith tabulator is a counting
machine which made use of punch
cards to read individual data. It
comprised of an input system,
processing and output system.

11. MARK 1 (HOWARD AIKEN)
This is a general purpose
electromechanical computer
which implemented von
Neumann’s architecture

12. ENIAC AND UNIVAC (John Mauchley and
Presper Eckert

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