Second generation were developed late on 1960s, and used the Transistors and other solid state, semiconducter device that were wired to circuit board in the computer.
Characteristic of Transistor
1. Smaller and much more reliable.
2. Generated little heat.
3. Less expensive.
4. Required less power than vacuum tube.
Tiny magnetic cores were used for the computer's memory or internal storage. Many computers had main memory capacities of less then 100 kilobytes and microseconds processing speeds.
Example is Radio, Calculator
Removable magnetic disk and magnetic tape for input, output and storage medium.
The picture of transistor
Magnetic Disk
Magnetic tape
Semi conductor