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External Bus Memory Transaction

amlan_cse
Beginner
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I want to know what is indicated by External Bus Memory Transaction.

Help says all memory transaction.
I think memory are connected to processor by internal bus.Then why it is called "External bus"?
Can someone point out the difference between "External Bus Memory Transaction", "External Bus I/O Bus", "External Bus partial Memory Transaction". Does x86 support memory mapped IO?
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