One of the first timesharing machines, the PDP-1, had a memory of 4-KB 18-bit words. It held
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One of the first timesharing machines, the PDP-1, had a memory of 4-KB 18-bit words. It held one process at a time in memory. When the scheduler decided to run another process, the process in memory was written to a paging drum, with 4K 18-bit words around the circumference of the drum. The drum could start writing (or reading) at any word, rather than only at word 0. Why do you suppose this drum was chosen?
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here are a few reasons why the paging drum was chosen for the PDP1 Cost Drums were relatively inexpensive at the time compared to other forms of stora...View the full answer
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Related Book For 
Operating Systems Design And Implementation
ISBN: 9780131429383
3rd Edition
Authors: Andrew Tanenbaum, Albert Woodhull
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