history of the computers

 history of the computers 

early computers used relays mechanical counters or delay lines for main memory 

functions ultrasonic delay lines were serial devices which could only reproduce 

data in the order it was written  drum memory.could be expanded at rekatively

low cost but effcient retrieval of out of discrete transistors were used for smaller

and faster.memories such registers such registers were relatively large and

too costly to use for large amout of data generally only a few hundred bits of such could be provided