1.      It occupy minimum space

2.      Minimum 2 or 1 hardware engineers

3.      The system works life long

DISADVANTAGES:-

1.      Current power waste

2.      It’s duration era 1975 to 1995

5^th GENERATION :- Laptop or Bio cells

Advantages :-

1.       It occupy a slate space

2.      Minimum one hardware engineer

3.      The system work life long

4.      It’s duration era 1995 onwards

TYPES OF COMPUTERS :-  Totally they are four types of computers. They are-

1.      Super computer

2.      Main frame computer

3.      Mini frame computer

4.      Micro frame computer

1.     SUPER COMPUTERS :- It is  highest computer having a good configuration

FOR EXAMPLE- Rockets or etc

2.     MAIN FRAME COMPUTERS :- Main frame computer is a highest computer having a good configuration like P4 systems

FOR EXAMPLE- USES- This system are used in banks, hotels, school, collages and institutes   

3.     MINI FRAME COMPUTERS :-  Mini frame computers is used up to specific task like D.N.S ( Domain Naming System ) and D.H.C.P ( Dynamic Host Configuration Products )

        FOR EXAMPLE- This systems will used up to limited networking