The document describes the main components of a computer system unit and motherboard. It provides pictures and descriptions of the front, back, and inside views of a system unit, highlighting components like the power button, drives, and ports. It also details the functions of the motherboard, central processing unit, random access memory, read only memory, and expansion slots.

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2. Examples of System Unit
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3. Inside view of System Unit
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4. Front view of a System Unit
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5. Back view of a system unit
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6. Functions of the main components of a system unit
1 Input/Output port A port is the point at which a peripheral
(I/O port) attaches to a system unit so that the
peripheral can send data to or receive
information from the computer.
2 Power button To start on computer
3 Motherboard Main circuit board of the system unit, which
has some electronic components attached to
it and others built into it.
4 Power Supply Convert standard electrical power into the
form that computer can use.
5 DVD-ROM drive A device that reads DVD-ROM, also can read
audio CDs, CDROMSs, CD-Rs and CD-RWs.
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7. Functions of the main components of a system unit
6 CD-ROM drive A device that reads audio CDs, CD-ROMs, CD-Rs
and CD-RWs.
7 DVD/CD-RW drive It is a combination drive that reads DVD and CD
media, it also writes to CD-RW media. This
drive also allows watching a DVD or burn a CD.
8 Floppy drive A device that reads from and writes on a floppy
disk.
9 Hard disk drive Store data, instructions and information. Also
called a hard disk.
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8. Layout of a motherboard
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9. Components of the motherboard
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10. Functions of the components of the motherboard
Components Functions
1 Central Processing Unit A CPU interprets instructions given by the
(CPU) software and carries out those instructions by
processing data and controlling the rest of
the computer’s components.
2 Random Access Memory A computer uses RAM to hold temporary
(RAM) instructions and data needed to complete
tasks.
3 Read Only Memory ROM is non-volatile. It holds the programs
(ROM) and data when the computer is powered off.
4 Expansion Expansion slots are the sockets where the
Slots circuit boards or the adapter cards can be
inserted into the motherboard.
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