3. Hardware - Input & Output Devices: Computer Science CIE IGCSE

Anything that allows data to be entered into a computer system

• Input Device

• Embedded system

• Output device

• Integrated circuit

Made up of a series of light and dark parallel lines

• Barcodes

• QR codes

• Input Devices

• Scanners

Give an example of a barcode standard

• USP

• DBS

• UPC

• CDU

What does UPC stand for?

• Universal Product Code

• Universal Protocol Control

• Unit of Perfect Colour

• Umbridge Perfects Custard

What are barcodes used in?

• Shops

• Libraries

• Parcels in courier/post services

• Museums

• Airport boarding passes

What do unique series of lines represent in barcodes?

• The numbers 0-9

• The letters of the alphabet

• Me

• URLs

What are the two long bars at the ends of a barcode called?

(a)  

What are guard bars for?

• They allow the barcode to be scanned from any angle

• They ensure that the scanner is at the correct distance from the barcode.

• They ensure that the lines to not spill over onto white paper.

• They prevent binary escape.

What is each digit in a barcode represented by?

• 2 dark lines

• 2 white lines

• 1 Dark line

• 1 white line

Describe the left hand side of a barcode:

• Has an odd number of elements

• Has an even number of elements

• Always begins with a dark bar

• Always begins with a light bar