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Computer Structure & Architecture 7d - Input, Output & Backing Storage

Computer Structure & Architecture 7d - Input, Output & Backing Storage

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Computer Structure & Architecture 7d - Input, Output & Backing Storage. Lesson 1 – Input and Output Devices. LI:Identify and describe the purpose of a range of computer input and output devices. An input device is used to send information to the computer - PowerPoint PPT Presentation

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Page 1: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Computer Structure & Architecture7d - Input, Output & Backing Storage

Page 2: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Lesson 1 – Input and Output Devices

LI: Identify and describe the purpose of a range of computer input and output devices

• An input device is used to send information to the computer

• Computers can capture a range of inputs including key strokes, sound, graphics and video

• Input devices include, mice / touchpads, keyboards, microphones etc.

Page 3: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Input Devices - Resolution• Resolution is used to measure the quality of an image.• It is measured in DPI (dots per inch) • The more dots per inch an image has, the higher the quality of the image.• Resolution has an effect on file size – the higher the resolution, the larger

the file size.• Resolution is used to measure the quality of webcams and scanners.

Page 4: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Output Devices• An output device allows data to be displayed or passed out of a

computer.

• Data can be output in many ways including visually, aurally or on paper.

• Most computer and laptop monitors have an LCD screen (Liquid Crystal Display).

• TFT (Thin Film Transistor) is a type of LCD technology.

• Resolution is used to measure the quality of a monitor.

Page 5: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Output Devices• Printers are measured by how fast they can print (pages per minute)

and resolution.

• The output of a printer is known as a hardcopy, electronic copies are known as softcopies.

• Inkjet and laser printers can both print high resolution images.

• Laser printers are much faster than inkjet printers.

• A plotter is an output device which draws pictures using coloured pens.

Page 6: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Lesson 2 - Backing Storage & Interfaces

• Hard discs are found inside the computer base, but portable drives are available. Typical storage 20 GB to 2 TB

• Magnetic tape is still used today, mostly for backups, because it is cheap and reliable.

• Optical storage includes CD-R’s (700 MB), DVD-R’s (4.7 GB) and Blu-Ray discs (25 GB).

LI: Identify and describe the purpose of a range of backing storage devices and be able to identify the most suitable one for different tasks. Identify and describe the purpose of an interface.

Page 7: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Backing Storage• USB Flash Memory and Flash Cards (such as SD cards) are known as

solid state devices.

• Solid state devices are robust because they have no moving parts

• Sequential access only allows the data to be read into the computer in the same order in which it was saved (i.e. in a sequence). Magnetic tape is an example of sequential access.

• Random or direct access allows the user to access data or files on any order. Examples of random or direct access include USB flash drives, hard discs, CD-R’s, DVD-R’s and Blu-Ray discs.

Page 8: Computer Structure & Architecture 7d  - Input, Output & Backing Storage

Interfaces• Interfaces go between the computer and a device so they can work

together. This compensates for the differences between how they operate.

• Interfaces can be both hardware and software. Hardware interfaces include USB, VGA and HDMI ports. Software interfaces include driver software e.g. a printer driver.

• Interfaces deal with Data conversion (e.g. analogue to digital)SpeedData storage