Contains instruction in pc ideas, data techniques, networking, working methods, laptop hardware, the Web, software purposes, assist desk concepts and drawback solving, and rules of customer service. The 1401 mainframe, the primary in the series, replaces earlier vacuum tube technology with smaller, more reliable transistors. Demand referred to as for greater than 12,000 of the 1401 computers, and the machineĀ“s success made a robust case for using common-function computer systems moderately than specialised programs. By the mid-1960s, nearly half of all computer systems on the earth had been IBM 1401s.