User`s guide

20
Inside a Desktop System Unit
Chapter 1 - The Big Picture
The figure below shows some of the most common components
inside the system unit case.
CPU
Floppy Drives, CD-ROM
Drives, and Tape
Backup Units
Hard Disk Drive
Power Supply
Expansion Boards
Mainboard
Expansion Slots
The mainboard is the large circuit board at the bottom of the
system unit case. It is the heart of your system. All of the other
components inside the case work for the mainboard. The power
supply delivers electricity to the mainboard. The disk drives,
keyboard connectors, and other parts of the system unit bring
information to and from the mainboard.