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Hi,
Address bus is the connection between CPU and the memory that is used for determining the area of memory in which CPU wants to write or from which it wants to read. Number of bits of adress bus influences the size of memory to which the CPU has an access.
Data bus is meanwhile responsible for transferring the appropriate data. The number of bits of this bus and the system frequency determine the speed of transfer.
Control bus is the connection between CPU, memory and I/O devices and is capable of bringing them the commands describing what they are supposed to do (for ex. reading from or writing to the memory).
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