The concept of modes of operation user mode system mode was introduced with

The concept of modes of operation user mode system

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63. The concept of modes of operation (user mode, system mode) was introduced with Time-sharing-systemSimple batch systemMultiprogrammed batch systemSerial processing 64. The principal objective of the time-sharing system is to 65. The processor was often idle waiting for the I/O instruction to conclude. To overcome the problem the following approach was introduced: when one job needs to wait for I/O, the processor can switch to the other job. This was a
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66. The programmer interacted directly with the computer hardware with 67. The serial processing presented two main problems:setup timeusing a monitortime slicingmultiprogrammingscheduling68. There were no OS withSimple batch systemsSerial processingTime-sharing-systemsMultiprogrammed batch systems69. This system handles multiple interactive jobsTime-sharing-systemSimple batch systemSerial processingMultiprogrammed batch system70. This system was developed by General Motors for the use on an IBM 701 Simple Batch Systems or GM-NAA I/OSerial processingMultiprogrammed batch systemTime-sharing system 71. This type of system was developed at MIT by a group known as Project MAC for the IBM 709 in 1961Serial processingMultiprogrammed batch systemSimple batch systemTime-sharing-system72. 'Lost signals, duplicate signals received'. This is 73. 'Two or more programs hung up waiting for each other'. This is 74. 'When programs share memory and their execution is interleaved by the processor, they may interfere with each other by overwriting common memory
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areas in unpredictable ways. The results of a particular program depend on the activities of other programs in a shared system'. This is
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