ict systems.ppt

8/14/2019 ICT SYSTEMS.ppt

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ICTSYSTEMS


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1.KEYBOARDS

LAYOUTS:

1. Qwerty layout

2. Dvorak layout

TYPES:

1. Conventional

2. Ergonomic or ergonometric

3. Overlay or concept

USES:

1. To input text2. To type in commands

3. To type in unusual selection ofcharacters. E.g. passwords

ADVANTAGES DISADVANTAGES

1.Allow accurate entryof data

1.Conventionalkeyboards can bedifficult for peoplewith disabilities

2. Quick entry of

original text

2.Not very quick to

input data comparedto direct data capture.e.g. OMR, MICR,barcode readers

3.Robust

4.Concept keyboards

are helpful to peoplewith disabilities

3.Takes up more space

than many other inputdevices


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2.NUMERIC KEYPAD

DEFINITION: a numeric keypad isused specifically to enter numbers,although alphabetic characters can beentered by using the function key

USES:

1. At electronic point of sales (EPOS)terminals

2. With automated teller machines

3. On mobile phones

4. For remote voting in conference

rooms

5. Entering PIN at various outlets forfunds transfer


1.Small andcompact andcan be carriedeasily

1.Difficult to entertext

2. Many of the

devices can beconnected tothe samecomputer

2.Can be too small

for the number tobe used efficiently

3.Easy to coverup whenentering PIN


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3.MICE

DEFINITON: a mouse allowsthe user to point by movingthe cursor in a graphical userinterface (GUI) on a PCsscreen

USES:

1. To move the pointer on thescreen as well as selectvarious items

2. Can be used to draw objectsin drawing and art packages


1.Allow fasterentry of chosenoption

1.Difficult to use forpeople withdisabilities

2. Allows fasternavigation

throughwebsites/slideshows

2. Can bevandalized/

damaged

3.Smaller and

more compactthan keyboards

3.Difficult to enter

textual data


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4.JOYSTICK DEFINITION: a joystick is an input device, which worksby moving the cursor when the user rocks a leverconnected to sensors


1.Allow faster entry ofchosen option compared totyping on a keyboard

1.Difficult to for entering dataother than choices

2. Can be used to controlobjects in three dimension

(3D)

2. Difficult to control the pointerthan other WIMP devices


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5.TOUCHSCREEN

USES:

1. ATMs by bank customers

2. EPOS terminals in cafes andvarious other outlets

3. Tourist information kiosks and forpublic transport enquiries

4. Personal digital assistants (PDAs),for choosing options andhandwriting recognition

5. Interactive whiteboards ineducation

6. smartphones


1.Allow fasterentry of optioncompared tokeyboards

1.Difficult to enterdata other than froma list of options

2. Easier to selectan option thanwith a mouse

2. Extensive use oftouchscreen may leadto RSI

3.People withdisabilities canfind it easier touse

4.Less likelihoodof selecting awrong option


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6.MAGNETIC STRIP

READER

USES:

1. Can be used anywhere payment isto be made using a debit or acredit card-in bank ATM-at EFTPOS (electronic funds

transfer at point of sales)terminals in cafes, supermarkets,restaurants and other types ofshops

2. In security , they are used to

prevent unauthorized access torestricted areas


1.Allow faster

entry of chosenoption comparedto keyboard entry

1.If the strip is

damaged, data mayneed to be enteredmanually resulting inloss of speed

2. More accuratein data entry than

with a keyboard2.If the card isdamaged or lost, itprevents access tothe cardholder tothe restricted area

3.Data entry ismore secure thanwith a keyboard

4.Prevents entryto restricted areaswithout the card


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READER/CHIP CARD

READER

USES:

1. Used as payment cards (e.g.phone cards), loyalty cards, IDcards and public transporttickets

2. Used with satellitebroadcasters to decodetelevisions programs

3. Used with subscriberidentification modules (SIMs) in

mobile telephones4. Used with electronic passports

and in driving licenses


1.Allowsimmediate

updating therebypreventing fraud

1.If the card is lostthe owner loses a

proportion of themoney/points

2. No need to bein immediatecontact with thereader-reducesdamage

2.If the card is stolenthe information can

be misused by thehackers

3.More securethan usingmagnetic strip

4.Prevents entry

to restricted areaswithout a card


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USES:

1. Used wherever a paymentneeds to be made; for example,in restaurants, supermarkets,shops of all descriptions.


1.Allows onlysecure transaction

to take place.

1. If the customerforgets the PIN, the

transaction has tobe cancelled.

2. Saves timecomparatively topayments madeusing cash or

cheques.

2. Need to ensureprotection of PINwhile using the card.

3. Chips are morerobust thanmagnetic strips.

READER


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USES:

1. Scan documents that can beconverted into text-baseddocuments using OCRSoftware.

2. Scan old documents for keepingrecords / archival.

3. Scan images that can betransferred as faxes.

4. To obtain digital images ofphotographs.

5. Used as barcode readers.

ADVANTAGES DISADVANTAGE

1. Allow images tobe store for

further editing.

1. Accuracy ofreproduction is

limited.

2. Using OCR onprinteddocuments savestime compared to

typing in the textagain.

3. Using barcodescanner is quickerthan typing in thebarcode.

9. SCANNER


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ict systems.ppt

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