Control unit The computer component that controls the actions of the other components in order to execute instructions in sequence Instruction register (IR) The register that contains the instruction currently being executed Program counter (PC) The register that contains the address of the next instruction to be executed CPU A combination of the arithmetic/logic unit and the control unit; the “brain” of a computer that interprets and executes instructions. Bus A set of wires that connect all major sections of a machine through which data flows Motherboard The main circuit board of a personal computer 124 Chapter 5 Computing Components Figure 5.2 Data flow through a von Neumann machine Bus Input devices CPU Main memory Output devices Control Unit The control unit is the organizing force in the computer, for it is in charge of the fetch-execute cycle, discussed in the next section. There are two registers in the control unit. The instruction register ( IR ) contains the instruction that is being executed, and the
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