- The computers were very larger in size.
- They consumed a large amount of energy.
- They heated very soon due to thousands of vacuum tubes.
- They were not very reliable.
- Air conditioning is required.
- Constant maintenance was required.
- Not-portable.
- Costly commercial production.
you can write any two of the above mentioned points...
Hope this answer helps you
..
..
Select it as the BRAINLIEST
