Bus

Bus consists of 1 or more wires

Real computer has multiple buses, for example: data, address, control

Size of bus: number of wires

B31-0 can be used to indicate 32 wires in the bus

B20-16 can be used to indicate a subset of wires

Slash indicates multiple wires and the number indicates how many

Bus allows any number of devices to connect, but only 1 may write at any given time

Why use bus?

Alternative:  connect all pairs of devices

Requires order of N2 connections