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- Large in physical size
- Relied on thermionic valves (vacuum tubes) to process and store data
- Consumed a lot of power
- Produced a lot of heat
- The computers constantly broke down due to the excessive heat generated;
hence were short- lived, and were not very reliable
- Their internal memory capacity/ size was low
- Processing speed was very slow
- Very costly
- Used magnetic drum memory
Jonmhumble answered the question on November 14, 2017 at 08:56
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