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(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 session of the SDA Main Board is scheduled for Friday, and the SDA Congress is scheduled for September 14 in Sarajevo.
In terms of the Main Board, the proposed amendments to the initial listing rules would offer companies looking to list on the CSE an alternative to the three-consecutive financial year net profit after tax requirement which is currently applicable.
"We are extremely happy to share with you that your company is migrating to NSE Main Board. This is among very few companies in the history of NSE Emerge to migrate to NSE Main Board.
Key changes were to move the primary MOSFET from the top of the main board to the bottom and away from the transformer to separate these dissipating sources.
"I guess the buying of TSMC and some old economy and financial stocks largely came from government-led funds which aimed to help the main board close above the 240-day moving average of around 10,800 points," Ta Ching Securities analyst Jerry Chen said.
Melco Philippines said its board approved the voluntary delisting of the common shares of the company from the PSE's main board subject to compliance with the PSE rules on delisting.
Rita Pik Fong Tsang, Chairperson and Executive Director of the Group said, 'The successful listing of the Company's share on the Main Board of SEHK is a proof of investors' confidence in the development and future prospects of our business.
Awarded companies in Quam IR Awards 2017 come from various categories, ranging from Hang Seng Index Constituents, Main Board and First Year After Listing companies, representing multi-national enterprises to local companies.
He has served on the SPL and SPFL boards, and is now on both the Professional Game Board and the SFA's Main Board.
According to etnews, Samsung might be using an 'SLP (Substrate Like PCB)' as the main board. This permits manufacturers to fit more components onto a single board by reducing their size, and allowing additional layers of components, while retaining the size of the board.
The process of obtaining eligibility to list can be obtained as quickly as 30 days from the date of submission of all required documents to the Bahrain Bourse (by contrast the IPO process on the Main Board Market can take up to two years).
The private market would be the third tier capital raising platform offered by PSX, the second tier was PSX SME Board and the first one being the PSX Main Board.