Posted by: wasaa | June 22, 2008

GENERATIONS OF COMPUTERS

 

FIRST

(early 50’s)

SECOND

(late 50’s)

THIRD

(60’s)

FOURTH (70’s +)

Technology

vacuum tubes

Transistors

IC

Microchips (LSI, VLSI)

Relative speed

1

100

100

1,000,000 +++

Relative cost

1

0.1

0.01

0.001 —

RAM capacity (bytes)

1,000-8,000

4,000-64,000

32,000- 4,000,000

32,000,000+++

External storage

cards

Tape

magnetic disks

mass storage

Operating System

Single user; jobs scheduled manually

Single user; jobs scheduled automatically

Multiple users; time- sharing

Multiple users; distributed 
systems

 

Microprocessor development.

 

Model (Intel)

Model

(Motorola)

YEAR

Speed ( MHz)

(roughly)

8088

 

 

8

8086

68000

 

4-8

80186

68010

 

16

80286

68020

1982

20

80386DX

68030

1986

40

80486dx4

68040

1990

66-75

Pentium  MMX

Power Pc

1997

166/200

Pentium II

Power PC G3/G4

1997

350- 450

Pentium III

 

2000

450-1200

Pentium IV

 

2001

1600-3000

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