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Hardware, Software & Automatic input devices
LO: Recognise hardware, software.
Learning outcome: Correctly identify hardware and software. Recognise and explain some of the most commonly confused software applications.
Lesson 2
Definitions
hardware(n.)(computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system
Easier definition: If you can break it with a hammer, it’s hardware.
Hardware…
Software…software(n.)(computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory
Easier definition: If you can double-click it, or infect it with a computer virus, it’s software. (Don’t get it confused with data)
Definition
Data…software(n.)(computer science) a single piece of information, as a fact, statistic, or code; Plural of Datum
Easier definition: The stuff the computer needs to use or change
What is the difference between data and information?
Anne Yes -
Bob No Yes
Craig No No
Without a context, data has no meaning
Name Present? Absence Authorised?
Anne Yes -
Bob No Yes
Craig No No
What’s the problem in entering large amounts of data via the keyboard?
Question:
It involves people. People are slow, inefficient and make mistakes.
Answer:
Automatic input devices are needed!!
Three automatic input devices and software easily confused …
OCR
OMR
MICR
Optical Character Recognition
Optical Mark Recognition
Magnetic Ink Character Rec.
OCR
OCR is used to scan in a page of text, then convert it to a form where it can be edited for example in a Word Processor
Optical Character Recognition
OMR Optical Mark Recognition
National Lottery Tickets
Multiple choice exam papers
OMR is used to read a mark (usually made by pencil) on a page in a particular position.
MICR Magnetic Ink Character Recognition
MICR enables a computer to accurately read numbers from a page. MICR numbers are also readable by humans.
Three input devices and software easily confused …
OCR
OMR
MICR
Optical Character Recognition
Optical Mark Recognition
Magnetic Ink Character Rec.
Advantages/Disadvantages
Device Ads Disads
OCR
OMR
MICR
Can read ‘normal’ English text
Need to scan inDifficult to useLarge file sizeErrors with reading
Very accurateEasy to useFast
Limited applicationsNeeds special ‘forms’
Very accurateCan use numbersHuman Readable
Specialist printing equip.Not good for large amounts
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