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First there was batch

First there was batch. Serial processing Waiting jobs sit on a job queue until they can be processed Things processed in first-in first-out order (FIFO). Batch processing. Things done, output results. Jobs .. Data, things to do. Machine Domain. Job Queue. Job execution. An IBM punch card.

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First there was batch

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  1. First there was batch • Serial processing • Waiting jobs sit on a job queue until they can be processed • Things processed in first-in first-out order (FIFO)

  2. Batch processing Things done, output results Jobs .. Data, things to do Machine Domain Job Queue Job execution

  3. An IBM punch card To read a card one character at a time

  4. Programs used punched cards

  5. We create codes using presence or absence – hole punched =I 0 0 0 1 0 1 0 1 1 Presence 0 Absence This concept has carried through to modern computing – codes used to identify characters and letters.

  6. Input and output Interactive processing Machine Domain Job execution

  7. Software Application System Utility Operating System Shell Kernel Software classification

  8. User User Shell Kernel User User

  9. Starting the system up • Bootstrap – BIOS (Basic Input Output system) • Permanently written instructions that load the operating system software into the computer memory

  10. A process Set of instructions • Current state • At what point in instruction set • State of data being processes Data (new, modified)

  11. Time sharing Proc B Proc B swap swap swap Proc A Proc A Time

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