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Lesson
4

4‐1
Early
Developments
in
Electronic
Data

  Processing

4‐
2
Mark
1

4
‐
3
The
Eniac

4
‐
4
The
Edvac

4
–
5
Computer
Generations

4
–
6
First
Generation
Computers

4
–
7
Second
Generation
Computers

4
–
8
Third
Generation
Computers

4
–
9
Fourth
Generation
Computer

  Howard
Aiken
began
work
on
the
Mark
I

at

   Harvard
University

  Mark
I
digital
computer
was
completed
in

   1944

  Mark
I
official
name
was
Automatic
Sequence

   Controlled
Calculator.

  Mark
I
functions:

    Could
perform
arithmetic
operations

    Could
locate
information
stored
in
tabular
form.

  Processed
numbers
up
to
23
digits
longs
and

   could
multiply
three
eight‐digit

numbers
in
1

   second.

  It
was
not
an
electronic
computer
but
as

   rather
an
electromechanical
one

  ENIAC
–
Electronic
Numerical
Integrator
and

   Calculator

  ENIAC
was
developed
by
Presper
Eckert
Jr.

   aand
John
Mauchly
from
1943
to
1946.

  It
has
18,000
vacuum
tubes
and
required
the

   manual
setting
of
switches.

  It
could
perform
300
multiplications
per

   second

  EDVAC
is
the
modified
version
of
ENIAC

  EDVAC
–
Electronic
Discrete
variable

   automatic
Computer

  EDVAC
employs
binary
arithmetic

  John
von
Neumann
invented
the
EDVAC

1.    First
Generation
Computers

2.    Second
Generation
Computers

3.    Third
Generation
Computers

4.    Fourth
Generation
Computers

  The
use
vacuum
tubes
in
place
of
relays
as
a

   means
of
storing
data
in
memory
and
the
use

   of
stored‐program
concept.

  It
requires
3.5
KW
of
electricity
per
day
to

   keep
the
vacuum
tubes
running

  Solid‐state
components
(
transistors
and

  diodes)
and
magnetic
core
storage
formed

  the
basis
for
the
second
generation
of

  computers

  Integrated
solid‐state
circuitry,
improved

  secondary
storage
devices
and
new
input/
  output
devices
were
the
most
important

  advances
in
this
generation.

  The
major
innovations
were
in
the

  development
of
microelectronics
and
in
the

  development
of
different
areas
in
computer

  technology
such
as:
multiprocessing,

  multiprogramming,
miniaturization,
time

  sharing
,
operating
speed
and
virtual
storage.

Lesson 4   data processing

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Lesson 4 data processing