Buses

Can anyone tell me what a bus actually is? I know it is the link between the processor and memory and disk, but what actually is it? i.e. a wire, a piece of hardware, etc.
Cheers.
PiersBullAsked:
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alexoCommented:
Actually?  Well actually a bus consists of traces on the motherboard (the equivalent of wires) and ICs (chips) that regulate the bus protocol (and they consist of many transistors which themselves are nothing more than impure silicon...)
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PiersBullAuthor Commented:
What is the bus protocol?
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alexoCommented:
Well, there are a lot of devices on the bus.  The bus protocol says which devices can "talk" to each other and when.  A code of conduct of sorts...

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PiersBullAuthor Commented:
Cheers.
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