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Software Systems CA History and development of Operating Systems Table of contents Page 1Contents Page 2Introduction Page 2-3History of Operating Systems Page 3Timesharing and Multiprogramming 1960s Page 4The personal computer era Page 4-5The Significant types of Operating Systems Page 5-6The Functions of Operating Systems Page 7Why OS is so critical Page 7Conclusion Page 8 Bibliography Introduction Operating Systems have earned the reputation for being the most critical software in a computer system In this paper i will be talking about 1The history of operating systems OS 2The function of OS 3The reason why OS are considered to be so critical History of Operating Systems Early History 1940s - 1950s At first computers lacked any form of operating system The computer user had sole use of the machine The user would arrive at the machine armed with his or her program and data often on punched paper tape The program would be loaded into the machine and then the machine set to work until the program stopped Later computers came with libraries of support code which were linked to the users program to assist in operations such as input and output This would become the start of the modern-day operating system However these machines still only ran a single job at a time Originally each user wrote all of the code necessary to implement a particular application including the highly detailed machine level inputoutput instructions Very quickly this inputoutput coding needed to implement basic functions was consolidated into an inputoutput control system IOCS Users wishing to perform inputoutput operations no longer had to code the instructions directly Instead they used IOCS routines to do the real work This greatly simplified and sped up the coding process The implementation of inputoutput control system may have been the beginning of the concept of operating system Under
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