Define local bus, data bus and PCI.

Local bus: In computer architecture a local bus is a computer bus that connects directly, or almost directly, from the CPU to one or more slots on the expansion bus. There are several local buses built into various types of computers to increase the speed of data transfer. Local buses for expanded memory and video boards are the most common. VESA local bus is an example of a local bus design, they provide very fast throughput.

PCI: PCI is an abbreviation for peripheral component Interconnect, which is a term used to describe a common connection interface for attaching computer peripherals to a pc’s motherboard, or main circuit board. It is also called a PCI bus.

PCI requirements include:

Bus timing

Physical size (determined by the wiring and spacing of the circuit board) Electrical features

Protocols

PCI specifications are standardized by the peripheral component interconnect special Interest Group.