Page 30 - UNI 101 Computer Science Handout.

Faculty of Nursing
Adult care Nursing Department

Figure 3 A Basic Personal Computer System

For comparison, Figure below shows the block diagram of a processor unit for a large mainframe

computer system. The main components in this system are one or more CPUs, memory, and a variety of
disks and other I/O devices, connected to the processor with an I/O channel system. In this diagram, the

processor unit includes the CPUs, memory, and I/O interface components. Specialized internal buses

interconnect the various parts of the processor unit. The keyboard and video display connected to the

processor unit are used only for control of the system. Other terminals and workstations are connected
to the processor in directly, through the I/O system or by network. In addition, multiple processor units

may be coupled together to form a large, integrated computer facility that can share programs and data.

30 Academic Year 2025/2026