The chief function of an operate system, we said, is to manage the resources of a confused data processor system. It has been said that necessity is the mother of invention. The development of operating systems to their present twenty-four hour period form is a good good example of that. At each stage in this development, bottlenecks were found which prevented employ the electronic computer resources to their fullest capacity. The need to eliminate those bottlenecks gave impetus to inventiveness jumper cable to the next step in the history of operating systems.
Stages of Development
PreHistory
The earlier computers did not ingest software. Their functionality was hardwired. To reprogram the work required rewiring. These machines, of course, did not have an operating system.
User SetUp and Breakdown
With the advent of the stored program machine the day of the von Neumann architecture machines began. But the early machines were costly behemoths, forthcoming only to clients with deep pockets.
When it was not uncommon to pay $1 million for a computer, those who used these machines for business or question were willing to go to great lengths just to get their second in the sun, so to speak. Computers were scheduled around the clock and users had to get in in at their scheduled time.
In addition to fill up their programs, the users had to load (and link, if necessary) any system software, such as compilers and gimmick drivers, needed for their run. And additional work was required to make the machine available for the next user.
Operator Controlled Machines
Very soon it became clear that during the rather extended setup and breakdown time the very expensive computer was not doing useful work. This waste of resources had to be remedied. A computer operator was put in charge of the machine. Users submitted their programs on slug cards.
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