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Software
Computer (hardware)
1010 0110 1011 11001101 1111 0000 10100110 1010 1110 0001
Add 20,22,34
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Memory
Magnetic core memory
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Memory(DRAM)
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Memory(DRAM)
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Software
Computer (hardware)
1010 0110 1011 11001101 1111 0000 10100110 1010 1110 0001
Add 20,22,34
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Running programs
Early computers:• programs on perforated cards• users installed tapes & cards…• signup sheets!
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Running programs
Things got a bit better:• operator installed punch cards in batches (less time organizing, more computing time)• a computer program controlled the execution of user programs (jobs)• users had no direct interaction
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Running programs
The PDP-1 operating system's timesharing ability made interactive access to computers economically viable by allowing various users to share the computer simultaneously. Shown here is the PDP-1 installation at BBN.
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Running programs
System programs:Operating Systems
User programs:Applications
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Hard disc
IBM DiscStorage System(1961)
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Creating programs
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Source code
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