Transcription of The Abstraction: Address Spaces
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The Abstraction: Address Spaces
13 The Abstraction: Address SpacesIn the early days, building computer systems was easy. Why, youask?Because users didn t expect much. It is those darned users withtheirexpectations of ease of use , high performance , reliability , etc., thatreally have led to all these headaches. Next time you meet one of thosecomputer users, thank them for all the problems they have Early SystemsFrom the perspective of memory, early machines didn t provide muchof an abstraction to users. Basically, the physical memory of themachinelooked something like what you see in Figure (page 2).
2 THE ABSTRACTION: ADDRESS SPACES max 64KB 0KB Current Program (code, data, etc.) Operating System (code, data, etc.) Figure 13.1: Operating Systems: The Early Days tive) program-debug cycles. The notion of interactivity became impor- tant, as many users might be concurrently using a machine, each waiting
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