d. Second-Generation Solid State Computers (1959).
Transistors made computers better, faster, smaller, and more efficient.
(2) Elimination of the vacuum tubes reduced amount of heat generated,
which reduced wear and tear, and increased reliability.
e. Third-Generation Integrated Circuit Computers (1964).
Silicon microchips, the size of a baby's nail, replaced transistors.
Increased speed, efficiency, and memory capability.