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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 memory sockets as well as the chipset, which houses the control circuits for all the peripheral devices. It also has a PCI-Express slot for a high-end graphics card and PCI slots for additional peripherals. Laptop motherboards have no expansion slots for more peripherals.

Want to Sound Like a Cool Geek?
Every now and then, say "mobo" instead of motherboard. 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.)

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.)
References in periodicals archive ?
The mother board supports an FPGA daughter board and single peripheral board.
And if that's not enough, stacking the PCIX board directly on a large HAPS mother board will remove the bottleneck completely.
By adding one or two FPGA_2x3 to the HAPS mother board, we will be able to prototype the larger designs by stacking the boards together, saving a tremendous amount of time," stated Kevin Smith, Senior FPGA Designer at Texas Instruments in Dallas, Texas (NYSE:TXN).
In order to assist quick and smooth penetration of an internal USB based storage device, Advantech, PQI and M-Systems have agreed on a world-wide industry standard connector and form factors for the Single Board Computer (SBC) market and eventually for mother board manufactures.
The system also includes a monitoring card that keeps track of the Operating System, mother board and CPU temperature and voltage, and CPU internal error message.
Tenders are invited for Automatic Addressable Fa System At Ro Epfo Coimbatore Sh Providing New Mother Board To The Fa Panel And Testing The External Wiring To Loop 2 And Re Commission The Fa Panel
The reference design is currently available in limited quantities as a development tool in a mother board and daughter card configuration.
Intel Core I3 Processor 1 Mb Cache Or Higher Amd A Series/ Invidia Ge Force A Series Or Higher Mother Board 4 Gb 1066 Mhz Ddr 3 Ram With 16 Gb Expandability 500 Gb Hdd 7200 Rpm Or Higher 18.
IntelCorei3 Processor, Intel Chipset Mother board, 4 GB DDR3, 1333MHz,, 500GB SATA Hard Disk Drive, DVD Writer, Loud Speaker, 104 Key Board, Optical Mouse,
The EasyFLASH-68HC11 development kit consists of an MCU mother board (68HC11 MCU included), a PSD daughter board (PSD813F1 included), a Cosmic CX68C11 compiler, Waferscale's PSDsoft(TM) 5.