Figure 1-1.Units/devices of a computer system

Information Systems Technician Training Series, Module 2 - Computer Systems
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programs. Figure 1-1 shows the CPU and the types of peripheral (input and output [I/O]) devices you will find in a computer system. The devices are interconnected by electrical cables thru a bus to allow communications between them. The CPU communicates with the peripheral devices through input/output (I/O) channels. The brain of a computer system is the central processing unit, which we refer to as the CPU. THE CPU IS THE COMPUTER. It receives the data transferred to it from one of the various I/O devices. It processes the data and transfers the intermediate or final results to an I/O device for storage or distribution. The CPU executes stored programs and does all the processing and manipulating of data. It contains the circuits that control and perform the execution of instructions using various types of memories. The I/O devices simply aid the computer by providing and receiving data and programs. In this section, you’ll learn about the control unit, the arithmetic-logic unit, primary storage, secondary storage, peripheral devices, I/O channels, and modems. Figure 1-1.—Units/devices of a computer system. 1-2

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