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A power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

A CD-ROM /ˌsiːˌdiːˈrɒm/ is a pre-pressed optical compact disc which contains data. The name is an acronym which stands for "Compact Disc Read-Only Memory". Computers can read CD-ROMs, but cannot write on the CD-ROM's which are not writable or erasable.

A network switch (sometimes known as a switching hub) is a computer networking device that is used to connect devices together on a computer network by performing a form of packet switching. A network switch is considered more advanced than a hub because a switch will only send a message to the device that needs or requests it, rather than broadcasting the same message out of each of its ports.
A network switch is a multi-port network bridge that processes and forwards data at the data link layer(layer 2) of the OSI model. Some network switches have additional features, including the ability to route packets; these switches are commonly known as layer-3 or multilayer switches. Switches exist for various types of networks including Fibre Channel, Asynchronous Transfer Mode, InfiniBand, Ethernet and others. The first Ethernet switch was introduced by Kalpana in 1990. Floppy Disk Drive, or FDD or FD for short, is a computer disk drive that enables a user to save data to removable diskettes. Although 8" disk drives were first made available in 1971, the first real disk drives used were the 5 1/4" floppy disk drives, which were later replaced with 3 1/2" floppy disk drives. Today, because of the limited capacity and reliability of floppy diskettes many computers no longer come equipped with floppy disk drives and are being replaced with CD-R, other writable discs, and flash drives.

SDRAM (Synchronous DRAM) is also a member of the DRAM family and has gained the name of "synchronous" because of the synchronization between this device and the memory bus. SDRAM became a popular choice for Intel based chipsets in 2001 and since 1996 the majority of Pentium and Celeron based systems have the SDRAM. In order to release and sell this model of RAM as better than those prior to it, this model had to offer something more, which was presented as being three times as fast as the FPM RAM and twice as fast as the EDO RAM. The SDRAM is able run at 133MHz.

DDR (Double Data Rate) RAMs is in the SDRAM family and was released in 2001 and soon after its release the mainstream motherboards began supporting this RAM. "The difference between SDRAM and DDR RAM is that instead of doubling the clock rate, [the DDR] transfers data twice per clock cycle" (Whitty, 2006) and this process is more efficient and effective in doubling the data rate. This RAM model has become the 'King of all RAMs' and has set the standard for models to follow.

Short for Integrated Drive Electronics or IBM Disc Electronics, IDE is more commonly known as ATA or Parallel ATA (PATA) and is a standard interface for IBM compatible hard drives.

A hard disk drive (HDD) is a data storage device used for storing and retrieving digital information using rapidly rotating disks (platters) coated with magnetic material. An HDD retains its data even when powered off. Data is read in a random-access manner, meaning individual blocks of data can be stored or retrieved in any order rather than sequentially. An HDD consists of one or more rigid ("hard") rapidly rotating disks (platters) with magnetic heads arranged on a moving actuator arm to read and write data to the surfaces.

A LAN (Local Area Network) card is a smaller electronic card that is placed in a PCI slot of the motherboard. This will allow you to connect your computer to a cable or DSL modem. A Local Area Network (LAN) card is used to provide wireless Internet access to computer users in home or roaming networks. It works by exchanging signals with a router, which transmits the signals over a physically wired line. The LAN card became ubiquitous in Western society in the early part of the twenty first century, when the cards became affordable due to wireless networks springing up everywhere, from coffee shops to airports. Most home Internet users use a LAN card for wireless Internet access so that multiple residents can be on the Internet at the same time.

A video card is a PC component that is used to enhance the quality of images showed on a display. It is attached to the motherboard and controls and calculates an image's appearance on the screen. The video card is an intermediate device that accelerates the video throughput.
Videos cards are also known as graphics cards, video adapters, display cards, graphic adapters and graphic accelerators.

A Video Graphics Array (VGA) connector is a three-row 15-pin DE-15 connector. The 15-pin VGA connector is found on many video cards, computer monitors, and high definition television sets. On laptop computers or other small devices, a mini-VGA port is sometimes used in place of the full-sized VGA connector.

A sound card (also known as an audio card) is an internal computer expansion card that facilitates the input and output of audio signals to and from a computer under control of computer programs. The term sound card is also applied to external audio interfaces that use software to generate sound, as opposed to using hardware inside the PC. Typical uses of sound cards include providing the audio component for multimedia applications such as music composition, editing video or audio, presentation, education and entertainment (games) and video projection.

Short for Automatic Voltage Regulator, AVR is a hardware device used to maintain a voltage to electronic devices.

registered jack (RJ) is a standardized physical network interface—both jack construction and wiring pattern—for connecting telecommunications or data equipment to a service provided by a local exchange carrier or long distance carrier.

unshielded twisted pair(UTP), a popular type of cable that consists of two unshielded wires twisted around each other. Due to its low cost, UTP cabling is used extensively for local-area networks (LANs) and telephone connections. UTP cabling does not offer as high bandwidth or as good protection from interference as coaxial or fiber optic cables, but it is less expensive and easier to work with.

power cable, mains cable or flex, a power cord is the primary cable that provides power to the computer, printer, monitor, and components within a computer. In the image to the right, is an example of the power cord that is commonly used with computers, monitors, printers, and other peripherals.

The motherboard is considered as the main circuit of the computer, it contains the connectors for attaching additional boards. Typically, the motherboard contains the CPU, BIOS, memory, mass storage interfaces, serial and parallel ports, expansion slots, and all the controllers required to control standard peripheral devices, such as the display screen, keyboard, and disk drive. Collectively, all these chips that reside on the motherboard are known as the motherboard's chipset. You must familiarize the motherboard parts and its function since this is needed to pass the TESDA NC II Computer Servicing Exam.

Parts of the Mother Board

BIOS or Basic Input Output System

A main function of the BIOS is to give instructions for the power-on self test (POST).This self test ensures that the computer has all of the necessary parts and functionality needed to successfully start itself, such as use of memory, a keyboard and other parts. If errors are detected during the test, the BIOS instruct the computer to give a code that reveals the problem. Computer Error codes are typically a series of beeps heard shortly after startup.

Carbon Metal–Oxide–Semiconductor (CMOS) - is a technology for making integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits. CMOS technology is also used for a wide variety of analog circuits such as image sensors, data converters, and highly integrated transceivers for many types of communication. Frank Wanlass successfully patented CMOS in 1967 (US Patent 3,356,858).

CMOS Battery - Is a button cell battery that gives power to CMOS so that the Bios setting is retain when the PC is turn off.

Chipset - Refers to a specific pair of chips on the motherboard: the NORTHBRIDGE and the SOUTHBRIDGE.The northbridge links the CPU to very high-speed devices, especially main memory and graphics controllers.

The southbridge connects to lower-speed peripheral buses (such as PCI or ISA). In many modern chipsets, the southbridge actually contains some on-chip integrated peripherals, such as Ethernet, USB, and audio devices. A chipset is usually designed to work with a specific family of microprocessors. Because it controls communications between the processor and external devices, the chipset plays a crucial role in determining system performance.

Types of Processor Sockets or Slots

| PGA Processor Slot |
A CPU socket or CPU slot is an electrical component that attaches to a printed circuit board (PCB) and is designed to house a CPU (also called a microprocessor). CPU socket structure is largely dependent on the packaging of the CPU it is designed to house. Most CPUs are based on the pin grid array (PGA) architecture in which short, stiff pins are arranged in a grid on the underside of the processor are mated with holes in the socket. To minimize the risk of bent pins, zero insertion force (ZIF) sockets allow the processor to be inserted without any resistance and then lock in place with a lever or latch mechanism.

SLOT TYPE CPU slot - are single-edged connectors similar to expansion slots, into which a PCB holding a processor is inserted. Slotted CPU packages offered two advantages: L2 cache memory size could be packaged with the CPU rather than the motherboard and processor insertion and removal was often easier. However, they proved to have performance limitations and once it was possible to place larger cache memory directly on the CPU die the industry reverted back to sockets.

Land grid array (LGA) - packages have started to supplant PGA with most modern CPU designs using this scheme. The term LGA "socket" is actually a bit of a misnomer. With LGA sockets, the socket contains pins that make contact with pads or lands on the bottom of the processor package.

Types of Memory Socket or Slot

Memory Socket or Slot - is commonly refers to the slot in a motherboard were the extended memory modules are installed.

| SIMM (Single-inline-memory module) slot, 72 pins |

| DIMM (Dual-inline-memory modules) slot. SDR (Single Data Rate) DIMM slot. 168 edge contacts. |

| DDR (Dual/Double Data Rate) DIMM slot. 184 edge contacts (DDR 1) |

| DDR (Dual/Double Data Rate) DIMM slot. 240 edge contacts (DDR 2 / 3) |

SODIMM (SO-DIMM is short for Small Outline DIMM ) Slot A 72-pin and 144-pin configuration. SO-DIMMs are commonly utilized in laptop computers.

Computer System Expansion Slots

The Expansion slot is a type of slot that connects an expansion bus (Adapter card), which allows the processor to communicate with peripheral attached to the adapter card. Data is transmitted to the memory or the processor travels from the expansion slot via the expansion bus and the system bus.

| ISA Slot |
ISA SLOT - Industry Standard Architecture, is an a 8 bit and 16 bit wide bus, and runs at 4.77 mhz. The ISA bus was developed by a team lead by Mark Dean at IBM as part of the IBM PC project in 1981. It was originated as an 8-bit system and was extended in 1983 for the XT system architecture. The newer 16-bit standard, the IBM AT bus, was introduced in 1984.

| PCI - Slot |
PCI SLOT - Peripheral Component Interconnect is a specification that defines a 32-bit data bus interface. PCI is a standard widely used by expansion card manufacturers.

| AGP - Slot |
AGP SLOT - Accelerated Graphics Port, also called Advanced Graphics Port, often shortened to AGP it is a high-speed point-to-point channel for attaching a graphics card to a computer's motherboard, primarily to assist in the acceleration of 3D computer graphics. AGP controller is only capable of controlling a single device.
AMR SLOT - Audio Modem Riser, Is a riser card that supports sound or modem function.

ACR SLOT - Advance Communication Riser, this type of slot is for communication and audio subsystem. The slot supports modem, audio, LAN, and Home Phoneline Networking Alliance (HPNA) or Home Networking cards.

CNR SLOT - Communications network riser, this connector supports specially designed network, audio, or modem riser cards, main processing is done through software and controlled by the motherboard’s system chipset.

| PCI - Express |
PCI –E - is a computer expansion card interface format introduced by Intel in 2004. It was designed to replace the general purpose PCI expansion bus.

* PCIe 1.1 (the most common version as of 2007) each lane carries 250 MB/s. * PCIe 2.0 doubles the bus standard's bandwidth from 2.5 Gbit/s to 5 Gbit/s, meaning a x32 connector can transfer data at up to 16 GB/s in each direction. * PCI Express 3.0 will carry a bit rate of 8 giga transfers per second.

| IDE - Controller |
IDE CONTROLLER - Integrated Drive Electronics, Parallel ATA (PATA) is an interface standard for the connection of storage devices such as hard disks, solid-state drives, and CD-ROM drives in computers. It uses the underlying AT Attachment and AT Attachment Packet Interface (ATA/ATAPI) standards

| FDD - Controller |
FDD CONTROLLER - Floppy Disk Drive, an onboard floppy drive controller which make your Floppy Disk Drive operational.

| SATA - Controller |
SATA CONTROLLER - Serial Advanced Technology Attachment is a computer bus primarily designed for transfer of data between a computer and storage devices (like hard disk drives or optical drives).

* SATA 1.5 Gbit/s * SATA 3.0 Gbit/s * SATA 6.0 Gbit/s

Types of Power Supply Terminal

| ATX - Power Connector |

These connectors are for power supply, the power supply plugs are designed to fit these connectors in only one orientation.

* AT / ATX * Auxiliary power

FRONT PANEL CONNECTOR / SYSTEM PANEL CONNECTOR - This connector attaches the switches and indicators. | Front Panel Connectors |

* Power switch (PWRSW) power-on the system unit * Reset switch (RESET) – Resets the system unit * Power / System LED – The system power LED lights up when system is powered up / Power indicator * Hard disk drive LED (HDDLED) –The HDD LED lights up(Blinks) during harddisk activity.

INPUT/OUTPUT (I/O) PORTS

I/O Ports are type of interface which a peripheral attaches to or communicates with thesystem unit so the peripheral can send data to or receive information from the computer.

* Keyboard / mouse * Monitors, projector * Printers, flatbed scanner * External storage devices, external modems * Headsets, microphones, game pads

| I/O Ports |
PS2 PORT - Personal system 2, are based on IBM Micro Channel Architecture, it is a 6-pin connector.This type of architecture transfers data through a 16-bit or 32-bit bus.

* Keyboard * Mouse

LPT PORT or PARALLEL PORT - Line Printer Port, This is a 25-pin port that connects a parallel printer, a flatbed scanner and used as a communication link for null modem cables.

SERIAL PORT or COM PORT - is a logical device name used by to designate the computer serial ports. A 9-pin connector used by pointing devices, modems, and infrared modules can be connected to COM ports.

USB PORT - Universal Serial Bus, a 4-pin serial cable bus that allows up to 127 plug-n-play computer peripherals. This allows attaching or detaching of peripherals while the host is in operation. Supports synchronous and asynchronous transfer types over the same set of wires up to 12Mbit/sec. USB 2.0 provides 40 times the transfer rate compared to USB 1.0 and competes with the 1394 standard.As of today we now have USB 3.0.

GAME/MIDI PORT - This connector supports a Joystick or a Game Pad for playing games, and MIDI Devices for playing or editing audio files.

LAN PORT - Used for Networking

AUDIO/SOUND port - Used for sound output, Line inputs and Microphone inputs

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