Operating Systems (original) (raw)

1999

Abstract

Introduction Early operating systems were control programs a few thousand bytes long that scheduled jobs, drove peripheral devices, and kept track of system usage for billing purposes. Modern operating systems are much larger, ranging from hundreds of thousands of bytes for personal computers (e.g., MS/DOS, Xenix) to tens of millions of bytes for mainframes (e.g., Honeywell's Multics, IBM's MVS, AT

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