Very helpful

1. Muhammad Abdullah

2.  Computer can be classified into five types according
to generations
 First GenerationVacuumTubes 1940-1956
 Second GenerationTransistors 1956-1963
 Third generation circuits 1964-1971
 Forth generation microprocessors 1971-present
 Fifth generation artificial intelligence present and
beyond

3.  Period:
1946-1954
 Size:
Size was equivalent
to a room
 Language:
Machine and
assembly language
 Main component:
VacuumTubes
 Storage media:
Magnetic drum &
Magnetic tape

4. Advantages
 It was only
electronic device
 First device to hold
memory
Disadvantages
 Vacuum tube burn
frequently
 They were
producing heat
 Maintenance
problems

5.  Period:
1955-1964
 Size:
Smaller then 1st
Generation
 Language:
Assembly & high level
language
 Main component:
Transistors
 Storage Media:
MagneticTape &
Magnetic Disk

6. Advantages
 Size reduced
considerably
 This is fast then 1st
Generations
 Very much reliable
Disadvantages
 They over heated
quickly
 Maintenance
Problems

7.  Period:
1965-1974
 Size:
Disk Size mini
Computers
 Language:
High level language
 Main component:
IC (Integrated circuit)
 Storage media:
Magnetic Disk &
Magnetic tape

8. Advantages
 ICs are very small in
size
 Improved
performance
 Production cost
cheap
Disadvantages
 ICs are sophisticated

9.  Period:
1975-1989
 Size:
typewriter size micro
Computers
 Language:
High level language
 Main component:
ICs with LSI(Large
scale Integrated )
 Storage media:
Magnetic Disk,
floppy & optical disk

10. Advantages
 It is a compact
 Less power
consumption
 Production cost is
cheap
Disadvantages
 No artificial
Intelligence

11.  Period: 1990’s- present
beyond
 Size: Credit card size micro
Computers
 Language: Artificial
intelligence language
 Main component: SLSI/ULSI(Super/Ultra
Large scale Integrated)
 Storage media: Card Magnetic &
optical disk

12. Advantages
 Artificial Intelligence
 Expert System
 Very Low Cost
Disadvantages
 No Disadvantages