Design

:

Designed by the use of vacuum tubes

Size

:

Large

Space required

:

Lot of space was required for their storage

Portability

:

Non-portable

Power requirement

:

Lot of power was required to operate them

Heat generation

:

Produced more heat

I/O operation

:

For input: punched cards, for output: paper tapes

Maintenance

:

Constant maintenance with air conditioning was required

Cost

:

Very expensive

Processing speed

:

Slow, since the switching time of vacuum tube is very high

Time of execution

:

Measured in milliseconds

Storage capacity

:

Very limited

Programs written

:

Using machine language

Reliability

:

Had little reliability

User capacity

:

Single user computers

Communication facility

:

No

Multimedia facility

:

No

Design

:

Designed by the use of transistors

Size

:

Smaller in comparison with the previous generation

Space required

:

Less as compared to the previous generation

Portability

:

Had little portability

Power requirement

:

Less power was required to operate them

Heat generation

:

Produced less heat

I/O operation

:

For input: punched cards, for output: paper tapes

Maintenance

:

Constant maintenance was not required

Cost

:

Less expensive as compared to the previous generation

Processing speed

:

Faster, since the switching time of transistor is very low

Time of execution

:

Measured in microseconds

Storage capacity

:

Increased as compared to the previous generation

Programs written

:

Using high-level language such as COBOL, FORTRAN etc.

Reliability

:

More reliability as compared to the previous generation

User capacity

:

Single user computers

Communication facility

:

No

Multimedia facility

:

No