Bernard T. Murphy on solid state: Biopolar and MOS on the same chip?

The rapid evolution of silicon technology has already created two revolutions and more lie ahead. This year marks the twenty-fifth anniversary of the introduction of Fairchild's RTL family, which were the first integrated circuits to have all circuit elements defined photolithographically on the same chip. About 1970, integrated circuits evolved into the system on a chip. What's to come?