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Motherboard

January 03, 2023

For other uses, see Motherboard (disambiguation).

A motherboard (also called mainboard, main circuit board,[1] mb, mboard, backplane board, base board, system board, logic board (only in Apple computers) or mobo) is the main printed circuit board (PCB) in general-purpose computers and other expandable systems. It holds and allows communication between many of the crucial electronic components of a system, such as the central processing unit (CPU) and memory, and provides connectors for other peripherals. Unlike a backplane, a motherboard usually contains significant sub-systems, such as the central processor, the chipset's input/output and memory controllers, interface connectors, and other components integrated for general use.

Motherboard means specifically a PCB with expansion capabilities. As the name suggests, this board is often referred to as the "mother" of all components attached to it, which often include peripherals, interface cards, and daughterboards: sound cards, video cards, network cards, host bus adapters, TV tuner cards, IEEE 1394 cards; and a variety of other custom components.

Dell Precision T3600 System Motherboard, used in professional CAD Workstations. Manufactured in 2012

Similarly, the term mainboard describes a device with a single board and no additional expansions or capability, such as controlling boards in laser printers, television sets, washing machines, mobile phones, and other embedded systems with limited expansion abilities.

Motherboard for a personal desktop computer; showing the typical components and interfaces which are found on a motherboard. This model follows the Baby AT (form factor), used in many desktop PCs.

History

 
Mainboard of a NeXTcube computer (1990) with microprocessor Motorola 68040 operated at 25 MHz and a digital signal processor Motorola 56001 at 25 MHz, which was directly accessible via a connector on the back of the casing.

Prior to the invention of the microprocessor, the digital computer consisted of multiple printed circuit boards in a card-cage case with components connected by a backplane, a set of interconnected sockets. In very old designs, copper wires were the discrete connections between card connector pins, but printed circuit boards soon became the standard practice. The central processing unit (CPU), memory, and peripherals were housed on individually printed circuit boards, which were plugged into the backplane. The ubiquitous S-100 bus of the 1970s is an example of this type of backplane system.

The most popular computers of the 1980s such as the Apple II and IBM PC had published schematic diagrams and other documentation which permitted rapid reverse-engineering and third-party replacement motherboards. Usually intended for building new computers compatible with the exemplars, many motherboards offered additional performance or other features and were used to upgrade the manufacturer's original equipment.

During the late 1980s and early 1990s, it became economical to move an increasing number of peripheral functions onto the motherboard. In the late 1980s, personal computer motherboards began to include single ICs (also called Super I/O chips) capable of supporting a set of low-speed peripherals: PS/2 keyboard and mouse, floppy disk drive, serial ports, and parallel ports. By the late 1990s, many personal computer motherboards included consumer-grade embedded audio, video, storage, and networking functions without the need for any expansion cards at all; higher-end systems for 3D gaming and computer graphics typically retained only the graphics card as a separate component. Business PCs, workstations, and servers were more likely to need expansion cards, either for more robust functions, or for higher speeds; those systems often had fewer embedded components.

Laptop and notebook computers that were developed in the 1990s integrated the most common peripherals. This even included motherboards with no upgradeable components, a trend that would continue as smaller systems were introduced after the turn of the century (like the tablet computer and the netbook). Memory, processors, network controllers, power source, and storage would be integrated into some systems.

Design

 
The Octek Jaguar V motherboard from 1993.[2] This board has few onboard peripherals, as evidenced by the 6 slots provided for ISA cards and the lack of other built-in external interface connectors. Note the large AT keyboard connector at the back right is its only peripheral interface.
 
The motherboard of a Samsung Galaxy SII; almost all functions of the device are integrated into a very small board

A motherboard provides the electrical connections by which the other components of the system communicate. Unlike a backplane, it also contains the central processing unit and hosts other subsystems and devices.

A typical desktop computer has its microprocessor, main memory, and other essential components connected to the motherboard. Other components such as external storage, controllers for video display and sound, and peripheral devices may be attached to the motherboard as plug-in cards or via cables; in modern microcomputers, it is increasingly common to integrate some of these peripherals into the motherboard itself.

An important component of a motherboard is the microprocessor's supporting chipset, which provides the supporting interfaces between the CPU and the various buses and external components. This chipset determines, to an extent, the features and capabilities of the motherboard.

Modern motherboards include:

Additionally, nearly all motherboards include logic and connectors to support commonly used input devices, such as USB for mouse devices and keyboards. Early personal computers such as the Apple II or IBM PC included only this minimal peripheral support on the motherboard. Occasionally video interface hardware was also integrated into the motherboard; for example, on the Apple II and rarely on IBM-compatible computers such as the IBM PC Jr. Additional peripherals such as disk controllers and serial ports were provided as expansion cards.

Given the high thermal design power of high-speed computer CPUs and components, modern motherboards nearly always include heat sinks and mounting points for fans to dissipate excess heat.

Form factor

Main article: Motherboard form factor

Motherboards are produced in a variety of sizes and shapes called form factors, some of which are specific to individual computer manufacturers. However, the motherboards used in IBM-compatible systems are designed to fit various case sizes. As of 2005, most desktop computer motherboards use the ATX standard form factor — even those found in Macintosh and Sun computers, which have not been built from commodity components. A case's motherboard and power supply unit (PSU) form factor must all match, though some smaller form factor motherboards of the same family will fit larger cases. For example, an ATX case will usually accommodate a microATX motherboard. Laptop computers generally use highly integrated, miniaturized, and customized motherboards. This is one of the reasons that laptop computers are difficult to upgrade and expensive to repair. Often the failure of one laptop component requires the replacement of the entire motherboard, which is usually more expensive than a desktop motherboard.

CPU sockets

A CPU socket (central processing unit) or slot is an electrical component that attaches to a Printed Circuit Board (PCB) and is designed to house a CPU (also called a microprocessor). It is a special type of integrated circuit socket designed for very high pin counts. A CPU socket provides many functions, including a physical structure to support the CPU, support for a heat sink, facilitating replacement (as well as reducing cost), and most importantly, forming an electrical interface both with the CPU and the PCB. CPU sockets on the motherboard can most often be found in most desktop and server computers (laptops typically use surface mount CPUs), particularly those based on the Intel x86 architecture. A CPU socket type and motherboard chipset must support the CPU series and speed.

Integrated peripherals

 
Block diagram of an early 2000s motherboard, which supports many on-board peripheral functions as well as several expansion slots

With the steadily declining costs and size of integrated circuits, it is now possible to include support for many peripherals on the motherboard. By combining many functions on one PCB, the physical size and total cost of the system may be reduced; highly integrated motherboards are thus especially popular in small form factor and budget computers.

Peripheral card slots

A typical motherboard will have a different number of connections depending on its standard and form factor.

A standard, modern ATX motherboard will typically have two or three PCI-Express x16 connection for a graphics card, one or two legacy PCI slots for various expansion cards, and one or two PCI-E x1 (which has superseded PCI). A standard EATX motherboard will have two to four PCI-E x16 connection for graphics cards, and a varying number of PCI and PCI-E x1 slots. It can sometimes also have a PCI-E x4 slot (will vary between brands and models).

Some motherboards have two or more PCI-E x16 slots, to allow more than 2 monitors without special hardware, or use a special graphics technology called SLI (for Nvidia) and Crossfire (for AMD). These allow 2 to 4 graphics cards to be linked together, to allow better performance in intensive graphical computing tasks, such as gaming, video editing, etc.

In newer motherboards, the M.2 slots are for SSD and/or Wireless network interface controller.

Temperature and reliability

 
A motherboard of a Vaio E series laptop (right)
 
A microATX motherboard with some faulty capacitors
Main article: Computer cooling

Motherboards are generally air cooled with heat sinks often mounted on larger chips in modern motherboards.[5] Insufficient or improper cooling can cause damage to the internal components of the computer, or cause it to crash. Passive cooling, or a single fan mounted on the power supply, was sufficient for many desktop computer CPU's until the late 1990s; since then, most have required CPU fans mounted on heat sinks, due to rising clock speeds and power consumption. Most motherboards have connectors for additional computer fans and integrated temperature sensors to detect motherboard and CPU temperatures and controllable fan connectors which the BIOS or operating system can use to regulate fan speed.[6] Alternatively computers can use a water cooling system instead of many fans.

Some small form factor computers and home theater PCs designed for quiet and energy-efficient operation boast fan-less designs. This typically requires the use of a low-power CPU, as well as a careful layout of the motherboard and other components to allow for heat sink placement.

A 2003 study found that some spurious computer crashes and general reliability issues, ranging from screen image distortions to I/O read/write errors, can be attributed not to software or peripheral hardware but to aging capacitors on PC motherboards.[7] Ultimately this was shown to be the result of a faulty electrolyte formulation,[8] an issue termed capacitor plague.

Modern motherboards use electrolytic capacitors to filter the DC power distributed around the board. These capacitors age at a temperature-dependent rate, as their water based electrolytes slowly evaporate. This can lead to loss of capacitance and subsequent motherboard malfunctions due to voltage instabilities. While most capacitors are rated for 2000 hours of operation at 105 °C (221 °F),[9] their expected design life roughly doubles for every 10 °C (18 °F) below this. At 65 °C (149 °F) a lifetime of 3 to 4 years can be expected. However, many manufacturers deliver substandard capacitors,[10] which significantly reduce life expectancy. Inadequate case cooling and elevated temperatures around the CPU socket exacerbate this problem. With top blowers, the motherboard components can be kept under 95 °C (203 °F), effectively doubling the motherboard lifetime.

Mid-range and high-end motherboards, on the other hand, use solid capacitors exclusively. For every 10 °C less, their average lifespan is multiplied approximately by three, resulting in a 6-times higher lifetime expectancy at 65 °C (149 °F).[11] These capacitors may be rated for 5000, 10000 or 12000 hours of operation at 105 °C (221 °F), extending the projected lifetime in comparison with standard solid capacitors.

In Desktop PCs and notebook computers, the motherboard cooling and monitoring solutions are usually based on Super I/O or Embedded Controller.

Bootstrapping

Motherboards contain a ROM (and later EPROM, EEPROM, NOR flash) to initialize hardware devices and load an operating system from a peripheral device. Microcomputers such as the Apple II and IBM PC used ROM chips mounted in sockets on the motherboard. At power-up, the central processor unit would load its program counter with the address of the Boot ROM and start executing instructions from the Boot ROM. These instructions initialized and tested the system hardware, displayed system information on the screen, performed RAM checks, and then loaded an operating system from a peripheral device. If none was available, then the computer would perform tasks from other ROM stores or display an error message, depending on the model and design of the computer. For example, both the Apple II and the original IBM PC had Cassette BASIC (ROM BASIC) and would start that if no operating system could be loaded from the floppy disk or hard disk.

Most modern motherboard designs use a BIOS, stored in an EEPROM or NOR flash chip soldered to or socketed on the motherboard, to boot an operating system. When the computer is powered on, the BIOS firmware tests and configures memory, circuitry, and peripherals. This Power-On Self Test (POST) may include testing some of the following things:

Many motherboards now use a successor to BIOS called UEFI. It became popular after Microsoft began requiring it for a system to be certified to run Windows 8.[12][13]

See also

References

  1. ^ Miller, Paul (July 8, 2006). "Apple sneaks new logic board into whining MacBook Pros". Engadget. from the original on October 4, 2013. Retrieved October 2, 2013.
  2. ^ "Golden Oldies: 1993 mainboards". from the original on May 13, 2007. Retrieved June 27, 2007.
  3. ^ "CPU Socket Types Explained: From Socket 5 To BGA [MakeUseOf Explains]". January 25, 2013. from the original on April 7, 2015. Retrieved April 12, 2015.
  4. ^ W1zzard (April 6, 2005). "Pinout of the PCI-Express Power Connector". techPowerUp. from the original on October 4, 2013. Retrieved October 2, 2013.
  5. ^ Karbo, Michael. "The CPU and the motherboard". Karbos Guide. from the original on April 27, 2015. Retrieved June 21, 2015.
  6. ^ "Temperatures". Intel® Visual BIOS Wiki. from the original on June 21, 2015. Retrieved June 21, 2015.
  7. ^ c't Magazine, vol. 21, pp. 216-221. 2003.
  8. ^ Chiu, Yu-Tzu; Moore, Samuel K. (January 31, 2003). . IEEE Spectrum. Archived from the original on February 19, 2003. Retrieved October 2, 2013.
  9. ^ . Low-esr.com. Archived from the original on September 15, 2013. Retrieved October 2, 2013.
  10. ^ Carey Holzman The healthy PC: preventive care and home remedies for your computer McGraw-Hill Professional, 2003 ISBN 0-07-222923-3 page 174
  11. ^ "-- GIGABYTE, --Geeks Column of the Week - All Solid Capacitor". www.gigabyte.com. from the original on March 27, 2017. Retrieved May 6, 2017.
  12. ^ "Windows Hardware Certification Requirements for Client and Server Systems". Microsoft. January 2013. System.Fundamentals.Firmware.CS.UEFISecureBoot.ConnectedStandby ... Platforms shall be UEFI Class Three (see UEFI Industry Group, Evaluating UEFI using Commercially Available Platforms and Solutions, version 0.3, for a definition) with no Compatibility Support Module installed or installable. BIOS emulation and legacy PC/AT boot must be disabled.
  13. ^ "Microsoft: All You Need to Know About Windows 8 on ARM". PC Magazine. Retrieved September 30, 2013.

External links

 
Wikimedia Commons has media related to Computer motherboards.
  • - v1.3 (pdf file)

January 03, 2023
motherboard, other, uses, disambiguation, motherboard, also, called, mainboard, main, circuit, board, mboard, backplane, board, base, board, system, board, logic, board, only, apple, computers, mobo, main, printed, circuit, board, general, purpose, computers, . For other uses see Motherboard disambiguation A motherboard also called mainboard main circuit board 1 mb mboard backplane board base board system board logic board only in Apple computers or mobo is the main printed circuit board PCB in general purpose computers and other expandable systems It holds and allows communication between many of the crucial electronic components of a system such as the central processing unit CPU and memory and provides connectors for other peripherals Unlike a backplane a motherboard usually contains significant sub systems such as the central processor the chipset s input output and memory controllers interface connectors and other components integrated for general use Motherboard means specifically a PCB with expansion capabilities As the name suggests this board is often referred to as the mother of all components attached to it which often include peripherals interface cards and daughterboards sound cards video cards network cards host bus adapters TV tuner cards IEEE 1394 cards and a variety of other custom components Dell Precision T3600 System Motherboard used in professional CAD Workstations Manufactured in 2012 Similarly the term mainboard describes a device with a single board and no additional expansions or capability such as controlling boards in laser printers television sets washing machines mobile phones and other embedded systems with limited expansion abilities Motherboard for a personal desktop computer showing the typical components and interfaces which are found on a motherboard This model follows the Baby AT form factor used in many desktop PCs Contents 1 History 2 Design 2 1 Form factor 2 2 CPU sockets 2 3 Integrated peripherals 2 4 Peripheral card slots 2 5 Temperature and reliability 3 Bootstrapping 4 See also 5 References 6 External linksHistory Edit Mainboard of a NeXTcube computer 1990 with microprocessor Motorola 68040 operated at 25 MHz and a digital signal processor Motorola 56001 at 25 MHz which was directly accessible via a connector on the back of the casing Prior to the invention of the microprocessor the digital computer consisted of multiple printed circuit boards in a card cage case with components connected by a backplane a set of interconnected sockets In very old designs copper wires were the discrete connections between card connector pins but printed circuit boards soon became the standard practice The central processing unit CPU memory and peripherals were housed on individually printed circuit boards which were plugged into the backplane The ubiquitous S 100 bus of the 1970s is an example of this type of backplane system The most popular computers of the 1980s such as the Apple II and IBM PC had published schematic diagrams and other documentation which permitted rapid reverse engineering and third party replacement motherboards Usually intended for building new computers compatible with the exemplars many motherboards offered additional performance or other features and were used to upgrade the manufacturer s original equipment During the late 1980s and early 1990s it became economical to move an increasing number of peripheral functions onto the motherboard In the late 1980s personal computer motherboards began to include single ICs also called Super I O chips capable of supporting a set of low speed peripherals PS 2 keyboard and mouse floppy disk drive serial ports and parallel ports By the late 1990s many personal computer motherboards included consumer grade embedded audio video storage and networking functions without the need for any expansion cards at all higher end systems for 3D gaming and computer graphics typically retained only the graphics card as a separate component Business PCs workstations and servers were more likely to need expansion cards either for more robust functions or for higher speeds those systems often had fewer embedded components Laptop and notebook computers that were developed in the 1990s integrated the most common peripherals This even included motherboards with no upgradeable components a trend that would continue as smaller systems were introduced after the turn of the century like the tablet computer and the netbook Memory processors network controllers power source and storage would be integrated into some systems Design Edit The Octek Jaguar V motherboard from 1993 2 This board has few onboard peripherals as evidenced by the 6 slots provided for ISA cards and the lack of other built in external interface connectors Note the large AT keyboard connector at the back right is its only peripheral interface The motherboard of a Samsung Galaxy SII almost all functions of the device are integrated into a very small board A motherboard provides the electrical connections by which the other components of the system communicate Unlike a backplane it also contains the central processing unit and hosts other subsystems and devices A typical desktop computer has its microprocessor main memory and other essential components connected to the motherboard Other components such as external storage controllers for video display and sound and peripheral devices may be attached to the motherboard as plug in cards or via cables in modern microcomputers it is increasingly common to integrate some of these peripherals into the motherboard itself An important component of a motherboard is the microprocessor s supporting chipset which provides the supporting interfaces between the CPU and the various buses and external components This chipset determines to an extent the features and capabilities of the motherboard Modern motherboards include CPU sockets or CPU slots in which one or more microprocessors may be installed In the case of CPUs in ball grid array packages such as the VIA Nano and the Goldmont Plus the CPU is directly soldered to the motherboard 3 Memory slots into which the system s main memory is to be installed typically in the form of DIMM modules containing DRAM chips can be DDR3 DDR4 DDR5 or onboard LPDDRx The chipset which forms an interface between the CPU main memory and peripheral buses Non volatile memory chips usually Flash ROM in modern motherboards containing the system s firmware or BIOS The clock generator which produces the system clock signal to synchronize the various components Slots for expansion cards the interface to the system via the buses supported by the chipset Power connectors which receive electrical power from the computer power supply and distribute it to the CPU chipset main memory and expansion cards As of 2007 update some graphics cards e g GeForce 8 and Radeon R600 require more power than the motherboard can provide and thus dedicated connectors have been introduced to attach them directly to the power supply 4 Connectors for hard disk drives optical disc drives or solid state drives typically SATA and NVMe now when Additionally nearly all motherboards include logic and connectors to support commonly used input devices such as USB for mouse devices and keyboards Early personal computers such as the Apple II or IBM PC included only this minimal peripheral support on the motherboard Occasionally video interface hardware was also integrated into the motherboard for example on the Apple II and rarely on IBM compatible computers such as the IBM PC Jr Additional peripherals such as disk controllers and serial ports were provided as expansion cards Given the high thermal design power of high speed computer CPUs and components modern motherboards nearly always include heat sinks and mounting points for fans to dissipate excess heat Form factor Edit Main article Motherboard form factor Motherboards are produced in a variety of sizes and shapes called form factors some of which are specific to individual computer manufacturers However the motherboards used in IBM compatible systems are designed to fit various case sizes As of 2005 update most desktop computer motherboards use the ATX standard form factor even those found in Macintosh and Sun computers which have not been built from commodity components A case s motherboard and power supply unit PSU form factor must all match though some smaller form factor motherboards of the same family will fit larger cases For example an ATX case will usually accommodate a microATX motherboard Laptop computers generally use highly integrated miniaturized and customized motherboards This is one of the reasons that laptop computers are difficult to upgrade and expensive to repair Often the failure of one laptop component requires the replacement of the entire motherboard which is usually more expensive than a desktop motherboard CPU sockets Edit A CPU socket central processing unit or slot is an electrical component that attaches to a Printed Circuit Board PCB and is designed to house a CPU also called a microprocessor It is a special type of integrated circuit socket designed for very high pin counts A CPU socket provides many functions including a physical structure to support the CPU support for a heat sink facilitating replacement as well as reducing cost and most importantly forming an electrical interface both with the CPU and the PCB CPU sockets on the motherboard can most often be found in most desktop and server computers laptops typically use surface mount CPUs particularly those based on the Intel x86 architecture A CPU socket type and motherboard chipset must support the CPU series and speed Integrated peripherals Edit Block diagram of an early 2000s motherboard which supports many on board peripheral functions as well as several expansion slots With the steadily declining costs and size of integrated circuits it is now possible to include support for many peripherals on the motherboard By combining many functions on one PCB the physical size and total cost of the system may be reduced highly integrated motherboards are thus especially popular in small form factor and budget computers Disk controllers for SATA drives and historical PATA drives Historical floppy disk controller Integrated graphics controller supporting 2D and 3D graphics with VGA DVI HDMI DisplayPort and TV output integrated sound card supporting 8 channel 7 1 audio and S PDIF output Ethernet network controller for connection to a LAN and to receive Internet USB controller Wireless network interface controller Bluetooth controller Temperature voltage and fan speed sensors that allow software to monitor the health of computer components Peripheral card slots Edit A typical motherboard will have a different number of connections depending on its standard and form factor A standard modern ATX motherboard will typically have two or three PCI Express x16 connection for a graphics card one or two legacy PCI slots for various expansion cards and one or two PCI E x1 which has superseded PCI A standard EATX motherboard will have two to four PCI E x16 connection for graphics cards and a varying number of PCI and PCI E x1 slots It can sometimes also have a PCI E x4 slot will vary between brands and models Some motherboards have two or more PCI E x16 slots to allow more than 2 monitors without special hardware or use a special graphics technology called SLI for Nvidia and Crossfire for AMD These allow 2 to 4 graphics cards to be linked together to allow better performance in intensive graphical computing tasks such as gaming video editing etc In newer motherboards the M 2 slots are for SSD and or Wireless network interface controller Temperature and reliability Edit A motherboard of a Vaio E series laptop right A microATX motherboard with some faulty capacitors Main article Computer cooling Motherboards are generally air cooled with heat sinks often mounted on larger chips in modern motherboards 5 Insufficient or improper cooling can cause damage to the internal components of the computer or cause it to crash Passive cooling or a single fan mounted on the power supply was sufficient for many desktop computer CPU s until the late 1990s since then most have required CPU fans mounted on heat sinks due to rising clock speeds and power consumption Most motherboards have connectors for additional computer fans and integrated temperature sensors to detect motherboard and CPU temperatures and controllable fan connectors which the BIOS or operating system can use to regulate fan speed 6 Alternatively computers can use a water cooling system instead of many fans Some small form factor computers and home theater PCs designed for quiet and energy efficient operation boast fan less designs This typically requires the use of a low power CPU as well as a careful layout of the motherboard and other components to allow for heat sink placement A 2003 study found that some spurious computer crashes and general reliability issues ranging from screen image distortions to I O read write errors can be attributed not to software or peripheral hardware but to aging capacitors on PC motherboards 7 Ultimately this was shown to be the result of a faulty electrolyte formulation 8 an issue termed capacitor plague Modern motherboards use electrolytic capacitors to filter the DC power distributed around the board These capacitors age at a temperature dependent rate as their water based electrolytes slowly evaporate This can lead to loss of capacitance and subsequent motherboard malfunctions due to voltage instabilities While most capacitors are rated for 2000 hours of operation at 105 C 221 F 9 their expected design life roughly doubles for every 10 C 18 F below this At 65 C 149 F a lifetime of 3 to 4 years can be expected However many manufacturers deliver substandard capacitors 10 which significantly reduce life expectancy Inadequate case cooling and elevated temperatures around the CPU socket exacerbate this problem With top blowers the motherboard components can be kept under 95 C 203 F effectively doubling the motherboard lifetime Mid range and high end motherboards on the other hand use solid capacitors exclusively For every 10 C less their average lifespan is multiplied approximately by three resulting in a 6 times higher lifetime expectancy at 65 C 149 F 11 These capacitors may be rated for 5000 10000 or 12000 hours of operation at 105 C 221 F extending the projected lifetime in comparison with standard solid capacitors In Desktop PCs and notebook computers the motherboard cooling and monitoring solutions are usually based on Super I O or Embedded Controller Bootstrapping EditMotherboards contain a ROM and later EPROM EEPROM NOR flash to initialize hardware devices and load an operating system from a peripheral device Microcomputers such as the Apple II and IBM PC used ROM chips mounted in sockets on the motherboard At power up the central processor unit would load its program counter with the address of the Boot ROM and start executing instructions from the Boot ROM These instructions initialized and tested the system hardware displayed system information on the screen performed RAM checks and then loaded an operating system from a peripheral device If none was available then the computer would perform tasks from other ROM stores or display an error message depending on the model and design of the computer For example both the Apple II and the original IBM PC had Cassette BASIC ROM BASIC and would start that if no operating system could be loaded from the floppy disk or hard disk Most modern motherboard designs use a BIOS stored in an EEPROM or NOR flash chip soldered to or socketed on the motherboard to boot an operating system When the computer is powered on the BIOS firmware tests and configures memory circuitry and peripherals This Power On Self Test POST may include testing some of the following things Video card Expansion cards inserted into slots such as conventional PCI and PCI Express Historical floppy drive Temperatures voltages and fan speeds for hardware monitoring CMOS memory used to store BIOS configuration Keyboard and Mouse Sound card Network adapter Optical drives CD ROM or DVD ROM Hard disk drive and solid state drive Security devices such as a fingerprint reader USB devices such as a USB mass storage deviceMany motherboards now use a successor to BIOS called UEFI It became popular after Microsoft began requiring it for a system to be certified to run Windows 8 12 13 See also EditPeripheral Component Interconnect PCI PCI X PCI Express PCIe Accelerated Graphics Port AGP M 2 U 2 Computer case screws CMOS battery Expansion card List of computer hardware manufacturers Basic Input Output System BIOS Unified Extensible Firmware Interface UEFI Overclocking Single board computer Switched mode power supply applications Symmetric multiprocessing Chip creepReferences Edit Miller Paul July 8 2006 Apple sneaks new logic board into whining MacBook Pros Engadget Archived from the original on October 4 2013 Retrieved October 2 2013 Golden Oldies 1993 mainboards Archived from the original on May 13 2007 Retrieved June 27 2007 CPU Socket Types Explained From Socket 5 To BGA MakeUseOf Explains January 25 2013 Archived from the original on April 7 2015 Retrieved April 12 2015 W1zzard April 6 2005 Pinout of the PCI Express Power Connector techPowerUp Archived from the original on October 4 2013 Retrieved October 2 2013 Karbo Michael The CPU and the motherboard Karbos Guide Archived from the original on April 27 2015 Retrieved June 21 2015 Temperatures Intel Visual BIOS Wiki Archived from the original on June 21 2015 Retrieved June 21 2015 c t Magazine vol 21 pp 216 221 2003 Chiu Yu Tzu Moore Samuel K January 31 2003 Faults amp Failures Leaking Capacitors Muck up Motherboards IEEE Spectrum Archived from the original on February 19 2003 Retrieved October 2 2013 Capacitor lifetime formula Low esr com Archived from the original on September 15 2013 Retrieved October 2 2013 Carey Holzman The healthy PC preventive care and home remedies for your computer McGraw Hill Professional 2003 ISBN 0 07 222923 3 page 174 GIGABYTE Geeks Column of the Week All Solid Capacitor www gigabyte com Archived from the original on March 27 2017 Retrieved May 6 2017 Windows Hardware Certification Requirements for Client and Server Systems Microsoft January 2013 System Fundamentals Firmware CS UEFISecureBoot ConnectedStandby Platforms shall be UEFI Class Three see UEFI Industry Group Evaluating UEFI using Commercially Available Platforms and Solutions version 0 3 for a definition with no Compatibility Support Module installed or installable BIOS emulation and legacy PC AT boot must be disabled Microsoft All You Need to Know About Windows 8 on ARM PC Magazine Retrieved September 30 2013 External links Edit Wikimedia Commons has media related to Computer motherboards The Making of a Motherboard ECS Factory Tour The Making of a Motherboard Gigabyte Factory Tour Front Panel I O Connectivity Design Guide v1 3 pdf file Retrieved from https en wikipedia org w index php title Motherboard amp oldid 1127067575, wikipedia, wiki, book, books, library,

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