What do you understand by scan codes, Computer Engineering

Assignment Help:

Q. What do you understand by Scan Codes?

A scan code is a code produced by a microprocessor in keyboard when a key is pressed and is unique to key struck. When this code is received by computer it reports an interrupt and looks up scan code table in BIOS and realize which keys have been pressed and in what combination. Special memory locations known as status bytes tell the status of locking and toggle keys for example Caps lock etc. Every key press produces two different scan codes - one on key-push down known as Make code and another on its popping back known as Break code. This two-key scheme enables the computer to tell when a key is held pressed down for example ALT key when pressing another key say CTRL-ALT-DEL.


Related Discussions:- What do you understand by scan codes

Create the website home page, Now when a site structure is set up for stori...

Now when a site structure is set up for storing pages and assets for Compass site, you'll create the first page-a home page for the site. As you build this page, you will add text,

Example of a router connects to at most networks, A router connects to at m...

A router connects to at most K networks. How many routers R are required to connect to N networks? Derive an equation that gives R in terms of N and K. If N K and K >=2 this

Show mpi functions, Q. Show MPI functions? MPI comprises hundreds of fu...

Q. Show MPI functions? MPI comprises hundreds of functions which are a small subset of which is enough for most practical purposes. We will discuss some of them here. Int M

Explain user datagram protocol, Explain User Datagram Protocol. UDP(Use...

Explain User Datagram Protocol. UDP(User Datagram Protocol) : User Datagram Protocol uses a connectionless communication paradigm. It is an application using UDP does not re

What is status control and registers, Q. What is Status Control and Registe...

Q. What is Status Control and Registers? Status Control and Registers: These registers can't be used by programmers though are used to control CPU or execution of a program.

Enumerate the process of dynamic modelling:, Define the Process of dynamic ...

Define the Process of dynamic modelling: Analyse applicability of actions Recognize object states Create dynamic model diagram Express every state in terms o

Classify data networks, Classify data networks. Data Network Classifica...

Classify data networks. Data Network Classifications: Data Networks are classified as per to their geographical coverage: - Wide area networks (WANs) - Metropolitan ar

Object orientation and uml, In this task you are supposed to create three U...

In this task you are supposed to create three UML diagrams. The conditions are given by the scenario in the document Theatre Case (on Blackboard). A theatre manager has ordered a s

Explain the working of static ram - computer memory, Explain the working of...

Explain the working of Static RAM - Computer Memory? SRAM devices tender extremely fast access times (approximately four times faster than DRAM) but are much more expensive to

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd