l21 - Different Computer Systems Mainframe Systems • Are...

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Different Computer Systems
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Mainframe Systems Are large systems Are very expensive Early mainframes were Batch Systems They used punched cards and tape for data and code input They used printer for results and error reporting
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Punched Card( Hollerith's card)
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Mainframe Systems Reduce setup time by batching similar jobs Automatic job sequencing – automatically transfers  control from one job to another.   First rudimentary  operating system. Resident monitor initial control in monitor  control transfers to job  when job completes control transfers back to monitor
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Batch Systems Users submits job Operator forms a batch by bunching user jobs Loads job into the card reader Computer executes these jobs sequentially and produces results on printer Printed output is collected by operator and distributed to users.
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Characteristics of Batch System Once a job starts executing , until finished no other job can execute Low CPU utilization because when program is reading data or producing output CPU is idle No user interaction Batch systems are appropriate for executing large jobs that require little interaction Card Reader Computer Printer
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Batch system Memory Layout
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Main task of the Batch processing OS was to transfer control from one job to another.
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