Computer Systems Topic 4 Peripherals Systems Building lab

Computer Systems Topic 4: Peripherals, Systems Building (lab session) V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 2 Scope and Coverage - 1 This topic will cover: • Printers & plotters; cameras & scanners; keyboard; mouse; touch screen/pad; monitors; display adapters; multimedia devices; storage media; networking; portable drives; plug and play components; performance factors V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 3 Scope and Coverage - 2 This topic will cover (cont. ): • Disassembling and assembling a computer system (lab session) – Installing motherboard, processor, heat-sink and fan, memory, power supply unit – Installing hard disc drive, optical drive – Installing specialised cards – Installing peripheral devices V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 4 Learning Outcomes By the end of this topic, students will be able to: • • V 1. 0 Explain the hardware, software and peripheral components of a computer system Build and configure a computer system to meet a design specification © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 5 Peripherals - 1 • A peripheral is a device that is attached to a computer system. • Physically separate from the computer – i. e. it is not built into the main systems unit • Is partially or wholly dependant on the computer – i. e. it probably will not function at all without the attached computer – But not always, e. g. some printers may allow printing of photographs from memory cards without a PC attached V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 6 Peripherals - 2 • Provides additional facilities to the computer • Does not form part of the CPU • Mostly provide input and output functions V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 7 Von Neumann Architecture – Showing Peripherals Memory Control Unit Arithmetic Logic Unit (ALU) Accumulator Input Output Backing Storage (not always included at this level) Sometimes regarded as peripherals Peripherals V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 8 Key Functions • Broadly, peripherals provide one or more functions – Input – Output – Storage – Communications V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 9 Input Devices • Take data from the real world and put it into the computer • Many types depending on use • A few are generic; many are specialised. V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 10 Keyboard - 1 • Update of typewriter • Good for small quantities of written data • Not good for large quantities of data – E. g. Census – Too slow • Not good for graphics or sound • Usual layout is called QWERTY – Some slight variations between countries • Compare a French keyboard with a British one for example • Compare your country’s standard layout with British (or French if you use British) V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 11 Keyboard - 2 • QWERTY (cont. ) – Designed to slow down typists when mechanical typewriters got jammed – NOT ergonomic! • Hands are at the wrong angle • Keys are grouped to slow you down – Still used because of retraining costs – Alternatives: Dvorak or alphabetical – What do they do in China or Japan? V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 12 Alternative Keyboards • Brightly coloured with lower case letters printed on – – – – – V 1. 0 For use in lower schools http: //tinyurl. com/6 elobqr Curved or split http: //tinyurl. com/69 tecgb Concept or overlay keyboard Programmable areas with overlay sheet Used on tills (Fast food) Used for disabled Used where there may be language problems © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 13 Mouse - 1 • Pointing device • Invented by Dr. Douglas C. Engelbart in 1963 – American working at Stanford – Never got any money from his invention – Patent ran out before mice became used V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 14 Mouse - 2 • Now many different designs – – – V 1. 0 Some ergonomic Mechanical or optical Tracker ball is upside down mouse Also trackpads etc on laptops Also joysticks Try to find the most expensive mouse you can on the Internet. • Does it actually do any more than a standard mouse? © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 15 Digital Camera • Incorporates a sensor that detects light levels and translates into digital values • Varies from low cost and low quality cameras built into mobile phones to high end professional devices • Video cameras use the same basic technology. • Usually, the camera is not directly attached to the computer – Offline – Photos stored on flash memory cards – Transfer to computer either by connecting camera (USB or Firewire) or using a separate memory card reader (which is itself a peripheral) V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 16 Scanner - 1 • Effectively a variation on a digital camera • Uses reflected light to translate documents into computer data – Bar code reader • Almost any packaged product you buy – Optical mark reader • Multiple choice exams – Flatbed scanner • Pages and photos V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 17 Scanner - 2 • Some use magnetic information rather than light. – Magnetic card reader • Credit cards (now using chip & pin more) – Magnetic ink character recognition (MICR) • On cheques V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 18 Graphics Tablet • Flat working area with stylus connected to computer • Use like pen & paper • Good for freehand drawing and picture editing • E. g. http: //tinyurl. com/6 jsxnlw • Interactive whiteboard is a variation on this V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 19 Touch Screen • Effectively a monitor (see later) and a graphics tablet combined • Displays images from the computer (usually your desktop) • Has a touch sensor that works with a stylus or your finger • Used on some smartphones (e. g. i. Phone), tablet PCs and i. Pad, some public interactive systems etc. • E. g. http: //tinyurl. com/62 qxhxe V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 20 Digitiser - 1 • Generic term for anything that converts analogue data to digital form • Modern cars have many sensors converting data about the engine etc. and feeding it to the control unit V 1. 0 © NCC Education Limited

Peripherals, Systems Building Topic 4 - 4. 21 Digitiser - 2 • Analogue: continuously variable – – Sound Light (photos, video) Temperature Almost all “natural” data • Digital: varies in steps – Computerised data – “Digital” TV V 1. 0 © NCC Education Limited