system resourceA tool used by either hardware to alert software of a need or by software to control a function of hardware. Hardware and software need a way to communicate with each other, and they do so by using a combination of four system resources:
- IRQ �� Hardware devices use the IRQ bus on a motherboard to signal the CPU for attention.
- port addresses �� Software addresses a hardware device using the device��s port, or I/O, address. The device "listens" to the bus to determine if it is being requested.
- memory addresses �� Software communicates with physical memory located in either RAM or ROM chips using memory addresses.
- DMA channel �� Data travels back and forth between memory and a hardware device using this channel.
Stay up to date on the latest developments in Internet terminology with a free weekly newsletter from Webopedia. Join to subscribe now.
Webopedia's student apps roundup will help you to better organize your class schedule and stay on top of assignments and homework. Read More »List of Free Shorten URL Services
A URL shortener is a way to make a long Web address shorter. Try this list of free services. Read More »Top 10 Tech Terms of 2015
The most popular Webopedia definitions of 2015. Read More »
The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »Computer Architecture Study Guide
This Webopedia study guide describes the different parts of a computer system and their relations. Read More »What Are Network Topologies?
Network Topology refers to layout of a network. How different nodes in a network are connected to each other and how they communicate is... Read More »