(redirected from main board)
Also found in: Dictionary.


(computer science)
A common pathway over which information is transmitted between the hardware devices (the central processing unit, memory, and each of the peripheral control units) in a microcomputer.


(mobo) The main printed circuit board in an electronic device, particularly a computer, which may contain sockets that accept additional boards ("daughter-boards").

In a personal computer, the motherboard contains the bus, the microprocessor, and integrated circuits used for controlling any built-in peripherals such as the keyboard, text and graphics display, serial ports and parallel ports, joystick, and mouse interfaces.


Also called the "system board," "main board" "base board" or "logic board," it is the primary printed circuit board in a computer or other electronic device. In a modern desktop computer, the motherboard contains the CPU and RAM sockets as well as the chipset, which houses the control circuits for all the peripheral devices (drives, keyboard, mouse, etc.). A motherboard typically also has a PCI-Express slot for a high-end graphics card and PCI slots for additional peripherals. Laptop motherboards do not have expansion slots for more peripherals.

Wanna Sound Cool?
Every now and then, say "mobo" instead of motherboard, and you will be a "cool geek." See CPU, chipset, PCI Express, PCI and controller.

PC Motherboard
This earlier Baby AT style motherboard required plug-in expansion cards for almost all the peripheral devices. The ISA slots are long gone, and the AGP slot was replaced with PCI-Express.

Expansion Cards
On earlier PCs, expansion cards were required for almost all peripheral devices except keyboard and mouse. Today, enthusiasts may plug in a faster graphics card, but most peripheral control circuits are already on the motherboard.

The Mother of All Motherboards
This is the front and back of the prototype of the first IBM PC motherboard in 1981. The chips are wired together on a "breadboard." (Images courtesy of IBM.) See breadboard.

The Mother of All Motherboards
This is the front and back of the prototype of the first IBM PC motherboard in 1981. The chips are wired together on a "breadboard." (Images courtesy of IBM.) See breadboard.
References in periodicals archive ?
The foreign securities house said the upgrade came in the wake of an anticipated increase of 10 percent in average earnings per share for companies listed on the main board in 2018,following an expected 10 percent increase in 2017.
The Listing Rules of the Main Board and GEM provide for all Listing Committee members to vacate office annually.
It graduated to the main board in just two-and-a-half years.
HONG Mingxian, Chairman and Executive Director of Differ Group, said, "Listing on the Main Board of SEHK today marks another important milestone in our history as the Group shifts to a wider platform to seize greater opportunities ahead.
Regan said: "We are delighted to welcome Ralph back to the main board, having already benefited from peter's wealth of experience in the past year.
However, since the decision by the JSE to shelve the project early April after it failed to gain traction among African companies, bringing in only two companies, Trustco and Wilderness Safaris of Botswana, Trustco has now opted for a secondary listing on the NSX and a primary listing on the more prestigious JSE main board.
PwC expects there will be 110 new listings in 2011 including 100 on the Main Board and 10 on the GEM Board, while the total capital raised around HK$300-350 billion ($38.
The Pronghorn Metro Main Board from ADI Engineering (ADI), a technology supplier, was selected by DR Telecom and RoamAD, its software platform supplier.
THE FA are bracing themselves for an explosive meeting of their main board next week.
In this week's look at the structure of major North-East companies, we feature the main board of Newcastle's Barratt Developments, the biggest housebuilder in the UK and the third-biggest company in the North-East by stock market value.
The move involves changes to both the main board and the creation of an executive board, which will be based in Leeds.
Lancashire-born Mr Wall joined Pilkington in 1956 as assistant solicitor in the legal department, becoming a divisional director 10 years later and a main board director of what was then Pilkington Brothers in 1970.