These computers used magnetic drums and circuity for memory. It was enormous (as big as a room). A single drum could have up to 200 tracks. It rotated at a speed of 3000rpm. A drum is similar to a magnetic tape or disk drive. This computer was very expensive to operate and could only solve one problem at a time. The computer relied on machine language to operate. The input was based on punch cards and paper tapes while outputs were shown on printouts. The following are the examples of computers made at this time:
1) UNIVAC- This was the first commercial computer delivered to a business client in 1951
2) ENIAC- This was the world’s first operational electronic digital computer
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