In early 1950’s two important engineering discoveries. These discoveries were the magnetic core memories and the Transistor Circuit Elements. This quickly found its way into new models of digital computers. These machines were very expensive and were also complicated to operate. Such computers were mostly found in large computer centers. Government, and research and development laboratories. These computers worked on a single problem at a time. Computer Manufacturers began to offer accessories such as:
Card Readers
Printers
Cathode-Ray-Tube
These were widely used in businesses for such things as:
Accounting
Payroll
Billing
These computer systems were sold for applications, such as hospitals, banks, and defense.