Input Device - Mouse

Made by Francesca Calleja 4.3

Mouse

The mouse is one of the most common input devices used.

The mouse usually has two buttons, a right and left one and also wheel which allows you to scroll up and down the page.

The mouse cursor is shaped like an arrow or a hand.

It enables you to control what happens on screen and you can point, select, drag and click items.

Advantages:

Ideal for use with desktop computers. Most computer users are familiar with

them and require little training. Works well in conjunction with keyboard

for data entry.

Disadvantages: It is not easy and convenient to input

text using a mouse. It is not accurate enough to use for

drawings that require high precision. They need a flat space close to the

computer. Overuse can lead to RSI (Repetitive

Strain Injury).

Trackball Mouse By Kimberly Mallia 4.3

This pointing device is specially designed to all the disability people.

To who it is designed ?

A trackball is a input pointing device that consist a ball held on top and contains sensors to detect a rotation of the ball about two axes.

The user rolls the ball with the thumb, fingers, or the palm of the hand to move a pointer.

What is a trackball mouse ?

THE KEYBOARD.

By Eli Foley

From type writers, key boards were formed. A keyboard is an input device as it is plugged into the computer by a wire. The teletype machine which was invented in the 1930’s was combined with a telegraph.

Early computer keyboards were adapted in the year 1046 by a punch card and teletype technology.

A keyboard is one of the most needed devices of a computer. Without a keyboard, words cannot be punched into the computer, therefore no data will be found.

Keyboards come in different shapes and sizes, some incredibly big and some rather small.

A new system of typing now, is by using touch screen devices such as ipads and smart phones.

The keyboard

Kyra Barbara

In computing, a keyboard is a typewriter-style device, which uses an

arrangement of buttons or keys, to act as mechanical levers or electronic switches. Following the decline of punch cards and

paper tape, interaction via teleprinter-style keyboards became the main

input device for computers.

A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands.

Despite the development of alternative input devices, such as the mouse, touchscreen, pen devices, character recognition and voice recognition, the keyboard remains the most commonly used and most versatile device used for direct (human) input into computers.

In normal usage, the keyboard is used to type text and numbers into a word processor, text editor or other programs. In a modern computer, the interpretation of key presses is generally left to the software. A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A keyboard is also used to give commands to the operating system of a computer, such as Windows' Control-Alt-Delete combination, which brings up a task window or shuts down the machine. Keyboards are the only way to enter commands on a command-line interface.

Joysticks – input A joystick is an input device which is

normly used for playing games on the computer.They control video games.

Louisa Azzopardi

What do joysticks contain ?

It consits of a stick which pivots on a base It reports it’s angle or direction to the

device it is controlling

Some facts about joysticks

A joystick is also called a control column

It is the principle device i a cockpit It may have one or more buttons

depending on its function.

Computer ProcessStephanie Caruana

4.3

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Rom (Read only Memory)

21

What is ROM?

Is memory that is capable of holding data and having that data read from the chip.

The disadvantages of ROMIt is only economical to buy mask

ROM in large quantities, since users must contract with a foundry to produce a custom design.

The turnaround time between completing the design for a mask ROM and receiving the finished product is long, for the same reason.

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ROMBy Hannah Delicata

What ROM stands for ROM stands for Read Only Memory

Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices. Data stored in ROM cannot be modified, or can be modified only slowly or with difficulty, so it is mainly used to distribute software that is very closely tied to specific hardware, and unlikely to need frequent updates.

Other types of non-volatile memory such as erasable programmable read only memory and electrically erasable programmable read-only memory or Flash ROM are sometimes referred to, in an abbreviated way, as "read-only memory" (ROM); although these types of memory can be erased and re-programmed multiple times, writing to this memory takes longer and may require different procedures than reading the memory. When used in this less precise way, "ROM" indicates a non-volatile memory which serves functions typically provided by mask ROM, such as storage of program code and non volatile data.

What ROM means

OUTPUT-PRINTERLara Demanuele class 4.3

THE MEANING OF OUTPUT IN GENERAL

Output it the term denoting either an exit or changes which exit a system and which activate/ modify a process. It is an an abstract concept, used in the modelling, system(s) design and system(s) exploitation.

PRINTER AS AN OUTPUT DEVICE

In publishing, printers are both companies providing printing services and individuals who directly operate printing presses.

The profession of printer became established after the invention of the moveable type printing press by Johannes Gutenberg around 1450, and proliferated throughout Europe. Such early printers often were recognizable by individual characteristics in the works they produced, such as type or typography, and since early printed books were made in relatively small quantities they are rare and collectible.

SOME PICTURES OF PRINTERS

Sound CardBy Mandy Tonna

What is a sound card? A sound card is an internal computer component that processes audio files  in

order to provide high-quality playback through computer speakers. A sound card plays voice as well as music files, and can handle various audio file formats including .wav, .Mp3and .cda to name but a few. The typical sound card has an interface available at the back of the computer with various input and output ports. The quality of the sound card and speakers both affect the overall sound quality of the computer system. Speakers plug directly into the back of the sound card.

A sound card also has a line-in port for listening to or recording from an external device such as a digital audio player. If the source device does not have a line-out port to connect to the sound card, a stereo cable can be run from the headphone jack on the source device to the line-in port on the sound card. Software configurations may be required to hear the device playing.

Another port on a sound card is the microphone port. By plugging in an external mic, one can record notes, lectures, daily personal logs, audio blogs or podcasts. For private listening, every sound card features a headphone jack, which offers the perfect way to enjoy MP3s, DVDs or other audio files without disturbing others.

How does a sound card work? Sound cards have a standard operation for controlling sound on

computers--of processing the input and output of sound. The input comes from other devices such as microphones or MIDI musical instruments. The sound card takes the sound from the device, records it and then processes it. For output, the device takes instructions from the program and plays the sound through speakers connected to the computer.

Output-SpeakersNicole Marmara’

Form4.3

SpeakersSpeakers are very common today.Many computers/laptops have them built in.Many people use them to listen to music on

their smartphones,tablets,laptops and/or computer.

They are external to a computer.

Thanks For Listening

Video Card By Rebecca Mulvaney.

What is a Video Card?› A video card is an expansion card which

generates a feed of output images to a display.

› A video card can also be called: • A video adapter, • A display card, • A graphics card, • A display adapter,

or• A graphics adapter.

Functions of Video card. Most video cards offer various

functions such as:• Accelerated rendering of 3D scenes and 2D

graphics,• MPEG-2/MPEG-4 decoding, • TV output,

or • The ability to connect multiple monitors

(multi-monitor).

Where does it go? Video hardware can be integrated into

the motherboard or the CPU, but all modern motherboards provide expansion ports to which a video card can be attached.

In this configuration it is sometimes referred to as a video controller or graphics controller

The ScreenBy Rebecca Wismayer

Why is your screen an output device?

•A screen is an output device because it displays what you are doing.

•We don’t give commands to the computer by using the screen.

The Projector

Martina Curmi

Why are Projectors used?A Projector is a device designed to take an image

from a video source and project it onto a screen or other surface.

The projector reflects the video signal off of thousands of tiny mirrors inside the projector itself, allowing for improved clarity and resolution when the image is projected onto a screen.

Projectors are used in a variety of different ways due to their ability to project movies and television programs onto a screen much larger than even the biggest TV available.

Computer Devices:Input and

Output

Rebecca Parnis, 4.3

What are Input and Output Devices?

• Input Devices:- An input device is any hardware device that sends

data to the computer, without any input devices, a computer would only be a display device and not allow users to interact with it, much like a TV.

• Output Devices:- Output devices are pieces of computer hardware that

allow a computer system to communicate information to a user or another system. This information can be in any form, and includes sound and images.

Rebecca Parnis, 4.3

Rebecca Parnis, 4.3

Modems

Rebecca Parnis, 4.3

What are Modems?

• Modems are both input and output devices as the internet transmission is passing from the company E.g. Go Internet; through the modem, to us users with internet access.

Rebecca Parnis, 4.3

Graphic TabletsBy Megan Mifsud

Information about the Graphic TabletThe graphic tablet is a input

device

It enables a user and draw pictures and graphics

It can be used to trace an image from a piece of paper

More Information! The device consists of a flat

surface which the user may draw or trace

It is displayed on a computer monitor

Uses of the Graphic TabletThey are considered to offer a

way to create graphic designs

In East Asia they are used in conjunction with writing Chinese, Japanese and Korean characters

ACCESSIBILITY DEVICES

Voice recognition

What is voice recognition?

Voice recognition is the computer analysis of a human voice.

It is very useful for people who are blind and cannot type on the keyboard.

It helps them because they don’t have to struggle by trying to type the correct letters on the keyboard.

It may also be used to give commands to the computer.

Advantages of voice recognition

Over 100 built-in commands

Easy to use New commands can

be easily added Application

downloads are usually free

No training is required for the users

Speech is a natural way to interact – even with computers

Helps people who have trouble using their hands

Helps people with disabilities

Computer Accessibility

Is vision loss to such a degree as to qualify as an additional support need through a

significant limitation of visual capability.

Computer accessibility refers to the accessibility of a computer system to all people, regardless of disability or severity of impairment.

There are numerous types of impairment that impact computer use. These include:•Cognitive impairments and learning disabilities.•Visual impairment. •Hearing impairment.•Motor or dexterity impairment.

Carla Vella Form 4.3

Visual impairment:

Mild to medium vision impairment, it is helpful to use large fonts, high DPI displays, high-contrast themes and icons supplemented with auditory feedback and screen magnifying software.

Severe vision impairment (blindness), screen reader software that provides feedback via text to speech or a refreshable braille display is a necessary accommodation for interaction with a computer.

Colour-blindness, colour shouldn’t be the only way of distinguishing between different pieces of information. However, the only colour combinations that matter are those that people with a deficiency might confuse, which generally means red and green and blue and green.

A screen reader is a software application that attempts to identify and interpret what is being displayed on the screen

(or, more accurately, sent to standard output, whether a video monitor is present or not).

A text-to-speech (TTS) system converts normal language text into speech; other systems render symbolic linguistic

representations like phonetic transcriptions into speech.

Technology for the Visually Impaired

• Using speech with the computerSpeech synthesis are used read text and screen contents giving visually impaired and blind users access. Those with very severe difficulties may require specialised speech screen reading software.

• Specialised equipment for the visually impaired In addition to standard computer equipment there is a range of special electronic equipment designed to be used by people with a visual impairment. This includes purpose made portable Braille computers and Braille input and output devices for standard computers.

• Getting the environment rightAn appropriate working environment is important for people with visual impairments. Good glare free lighting will be required for reading, while the screen will need to be away from direct light.

The End