COMPUTER SYSTEM ESSENTIALLY FOR USE IN THE CONTROL OF DIGITAL DATA TRANSMISSION IN A DIGITAL TELEPHONE EXCHANGE

摘要

The invention concerns a computer system in which a main processor (10) can communicate with one or more peripherals (13) via a bi-directional data bus (11) having a width restriction. An Input/Output controller (12) contains control and status registers and is responsive to the range of bus (11), this bus range being split into a number of areas each representing one of the software processes which is to communicate with a peripheral (13).