Mainframe Computer pictured above
The 1960s saw large mainframe computers become much more common in large industries and with the US military and space program. IBM became the unquestioned market leader in selling these large, expensive, error-prone, and very hard to use machines.
Computer Operation and Programming is a skill that requires intensive labor and education. It is unavailable to the common man, and accessible only through a Science education program or other specialized skill programs.