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This is a machine architecture, according to the diagram, and according to various books. It needs to be rewritten, to distinguish that this is not a CPU architecture. (hence the CPU is a unit in this model, not the entirety of the model). I/O devices, main memory and the CPU all exist on a system bus to communicate with one another, the system bus is composed of data lines, address lines and control lines. That is the standard way that PCs are built on when the system bus was a local bus (ie. the original IBM PC, when simplified to a basic diagram)