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System unit
Hassan Iqbal
System Unit
 The system unit is the box-like case that
contains the electronic components of a
computer.
 Devices like the power supply, different drives,
the fan, the connectors, and the motherboard.
 Other names for the system unit include the
computer chassis, cabinet, box, tower,
enclosure, housing, or simply case.
2
Parts of it
 These are some of the major components
found inside system unit
3
Mother Board
 The motherboard is sometimes called the
system board or main board
 It is the main circuit board of a microcomputer
 This component contains the connectors for
attaching additional boards
 All other parts connect in one way or another
to the motherboard.
4
Diagrammatical Representation
5
Diagrammatical Representation
6
Mother board
 The motherboard makes sure all those
components of the system all runs together
properly, without any sparks or grating noises
 Think of it like the nervous system or
circulatory system of the computer
7
Ports in mother board
8
Hard disk Drive
 A hard disk drive is a high capacity, non-
volatile, magnetic data storage device with a
volume (disk) that is usually non-removable.
 Data is magnetically read and written on the
platter by read/write heads that float on a
cushion of air above the platters.
9
Diagrammatical Representation
10
Energy in controller
 The controller doesn’t drive enough current to
turn on or move the hard drive motors.
 So all hard drives use a motor driver chip.
 It takes the commands sent from the
controller to the motors and passes them to
the motors, but with a higher current
 So, this chip is located between the controller
and the motors.
11
RAM
 Forth main chip you can find on a logic board
is the RAM (Random Access Memory) chip,
also known as buffer
 This chips has an ultimate role in the hard
drive performance
 The higher its capacity, the fastest the data
transfer between the drive and the computer
will be.
12
Power Supply Unit
 The power supply unit (PSU) is used to convert
AC currents from the main supply to the different
DC voltages required by various computer
components.
 Power supplies are quoted as having a certain
power output specified in watts, A standard power
supply would typically be able to deliver around
350 watts.
 You will need more power from the power supply if
your PC has more operating components
13
Representation
14
CD-ROM drive
 This is a high capacity optical data storage
device with a removable disk. It writes data
onto or reads data from a storage medium.
 A CD-ROM drive connected to the computer.
15
16

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System unit

  • 2. System Unit  The system unit is the box-like case that contains the electronic components of a computer.  Devices like the power supply, different drives, the fan, the connectors, and the motherboard.  Other names for the system unit include the computer chassis, cabinet, box, tower, enclosure, housing, or simply case. 2
  • 3. Parts of it  These are some of the major components found inside system unit 3
  • 4. Mother Board  The motherboard is sometimes called the system board or main board  It is the main circuit board of a microcomputer  This component contains the connectors for attaching additional boards  All other parts connect in one way or another to the motherboard. 4
  • 7. Mother board  The motherboard makes sure all those components of the system all runs together properly, without any sparks or grating noises  Think of it like the nervous system or circulatory system of the computer 7
  • 8. Ports in mother board 8
  • 9. Hard disk Drive  A hard disk drive is a high capacity, non- volatile, magnetic data storage device with a volume (disk) that is usually non-removable.  Data is magnetically read and written on the platter by read/write heads that float on a cushion of air above the platters. 9
  • 11. Energy in controller  The controller doesn’t drive enough current to turn on or move the hard drive motors.  So all hard drives use a motor driver chip.  It takes the commands sent from the controller to the motors and passes them to the motors, but with a higher current  So, this chip is located between the controller and the motors. 11
  • 12. RAM  Forth main chip you can find on a logic board is the RAM (Random Access Memory) chip, also known as buffer  This chips has an ultimate role in the hard drive performance  The higher its capacity, the fastest the data transfer between the drive and the computer will be. 12
  • 13. Power Supply Unit  The power supply unit (PSU) is used to convert AC currents from the main supply to the different DC voltages required by various computer components.  Power supplies are quoted as having a certain power output specified in watts, A standard power supply would typically be able to deliver around 350 watts.  You will need more power from the power supply if your PC has more operating components 13
  • 15. CD-ROM drive  This is a high capacity optical data storage device with a removable disk. It writes data onto or reads data from a storage medium.  A CD-ROM drive connected to the computer. 15
  • 16. 16