Operating Systems. What is an operating system. an extended machine, easier to program for the user a resource manager, with more multiple users using the system efficient and correct use of the available resources is conducted by the operating systems. . Typical Services Provided by an O.S.
It is better tie up the evolution of the operating systems to the hardware, to give a true picture, as done by Tanenbaum.
All the programming was in machine language, often by wiring up plug-boards to control machine's basic functions. All the problems programmed were numeric calculations such as tables of sines and cosines. Punch-cards were introduced in 1950 which replaced plug-boards…
Commercial use of computers has become possible. They were small enough and reliable enough to be manufactured and sold. They were kept in special dust-free air conditioned rooms and attended by operators only.
Software support from the OS:
(still to come!), distributed computing, parallel computing, very high speed communication (order of many giga bits per second), www, mobile systems