These computers were made using transistors. In these new powerful computers machine language was replaced by the easier to programme assembly language. These computers used batch processing modes. Punched cards or magnetic tape were used for input media.
These computers consumed less power, small in size and were faster and more reliable. These computers used binary number system. The basic limitation of 2nd generation computers was that these machines were more expensive the period of second generation computers was from 1959-1964.