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Processor
(CPU)
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Main
Memory (aka real memory, aka primary
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memory)
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holds
data in code
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I/O
modules (I/O controllers, I/O channels, I/O
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processors...)
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hardware
(with registers called I/O ports) that
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moves
data between cpu and peripherals like:
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secondary
memory devices (eg: hard disks)
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keyboard,
display...
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communications
equipment
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System
interconnection (ie: Buses)
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communication
among processors, memory, and
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I/O
modules
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Secondary
memory (aka stable memory, aka
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storage)
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preserves
contents even with computer powered down
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