The Motherboard & System Bus By Cynthia, Maxine, and Asianne
The Motherboard • The main circuit board of the computer. • Also known as main board, system board, base board, planar board, logic board, and mobo. • Contains the memory, mass storage, CPU, BIOS, serial and parallel ports, and expansion slots.
The Motherboard • Everything plugs directly or indirectly into the mobo. • All chips on the mobo are known as the chipset. • The chipset is divided into the north and south bridges.
The Motherboard • All components communicate with the CPU through the chipset. • The north bridge consists of the logic centre and RAM. • The south bridge is slower than the north bridge. • It is not connected directly to the CPU.
The Motherboard • The south bridge controls all the input/ output functions. • A form factor is a standardized mobo design. • It defines the size and design (screw placement, etc.). • Common form factor designs are PC/XT, AT/baby AT, and the ATX.
The Motherboard • The PC was the first mobo design. • It was very big. • It was eventually replaced by the XT (extended technology), which was much smaller. • The XT became the first standard mobo design.
The Motherboard • The AT (advanced technology) was bigger than the XT, because they added more components. • As circuits became smaller, mobo sizes were reduced. • The baby AT, which was smaller, replaced the AT.
The Motherboard • The ATX was close to the baby AT in size. • It was cheaper to make, faster, and more stable. • It also had more expansion slots. • It is still the standard today.
Picture Slide! ^A motherboard^
Picture Slide! ^A System Bus^ Diagram
The System Bus • Connects the CPU to the main system memory. • Also called the front side bus, memory bus, local bus, expansion Bus, and host bus. • The input/output buses branch off the system bus. • It allows external devices to be added.
The System Bus • It is composed of wire pathways that carry data. • These pathways are called the data bus. • It allows other parts of the computer to communicate with each other. • It also transports data within the mobo.
The System Bus • It is composed of the internal bus and external bus. • The internal bus consists of the CPU, system memory, and mobo. • It is the actual system bus. • The external bus allows more devices to be added to the computer.
Sources: webopedia.com computer.howstuffworks.com hardwarecentral.com pccomputernotes.com Images: Background: freefoto.com Motherboard: wafflesandpirates.files.wordpress.com System Bus: www.ackadia.com The End!