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Compare memory mapped I/O with I/O mapped I/O.
Memory Mapped I/O Scheme: In this scheme there is only one address space. Address space is stated as all possible addresses that microprocessor can generate. Some addresses are allocated to memories and some addresses to I/O devices. An I/O device is also treated just like a memory location and one address is assigned to it. In this scheme all the data transfer instructions of microprocessor can be used for both memory and I/O device. This scheme is suitable for a small system.
In I/O mapped I/O scheme addresses assigned to memory locations can also be assigned to I/O devices. As the same address may be assigned to a memory location or an I/O device, microprocessor should issue a signal to distinguish whether the address on address bus is for a memory location or an I/O device.
The First In First Out method assumes items of stocks are issued in the same order as they are received. Thus the goods received first are assumed to be the first to be issued .Any
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