Computer Studies Notes + Tips + Queries

[hafsa saleem]

hey can plz any1 help me comprehend this statement.i read it from a site bt i fail to understand it. wht it states is "validation can be used to protect data frm mistakes by the user whereas verification can be used 2 protect data frm probs that occur due 2 systems fault"according to me it is completely illogical. i request any1 who can grasp the logic behind the statement to explain me so.
plzzzzzzzzzz help soon

 

[Dream.Eater]

hey can plz any1 help me comprehend this statement.i read it from a site bt i fail to understand it. wht it states is "validation can be used to protect data frm mistakes by the user whereas verification can be used 2 protect data frm probs that occur due 2 systems fault"according to me it is completely illogical. i request any1 who can grasp the logic behind the statement to explain me so.
plzzzzzzzzzz help soon

That statement is a bit confusing....
Generally, validation means to make sure that the data entered fulfils certain criteria such as a particular length or format and verification means to check the data for errors ( by double entry or visual check etc)once it is transferred from one medium to another such as from paper to the screen.
Hope this helps!

 

[Bhaijan]

Is the GCSE Computer Studies by Graham Taylor a reliable source for preparation? Or should I look somewhere else, perhaps in the coursebook?

 

[kirann]

How can an interrupt be generated?

 

[Dream.Eater]

How can an interrupt be generated?

Suppose you set up your printer to print a 50 page document. Halfway, if it runs out if paper then the printer is going to send an 'urgent message' to the processor demanding it to stop what it is doing and deal with the error the printer is facing. This message is called an interrupt and is generated when a peripheral device encounters some problem and requires the processor's attention. It causes the processor to stop what its doing at the moment and deal with the interrupt.
Hope this helps!

 

[kirann]

Suppose you set up your printer to print a 50 page document. Halfway, if it runs out if paper then the printer is going to send an 'urgent message' to the processor demanding it to stop what it is doing and deal with the error the printer is facing. This message is called an interrupt and is generated when a peripheral device encounters some problem and requires the processor's attention. It causes the processor to stop what its doing at the moment and deal with the interrupt.
Hope this helps!

So it deals ONLY with the peripheral devices ?

 

[Dream.Eater]

So it deals ONLY with the peripheral devices ?

As far as i know, yes it deals only with peripheral devices only, since it deals with requesting help from the processor which is , after all, the most powerful component in a computer. Therefore, it involves communication between peripherals and the processor only.

 

[♣♠ Magnanimous ♣♠]

So it deals ONLY with the peripheral devices ?

first see the definition of interrupt --> A message gone to processor demanding to stop what it is doing and concentrate on external device.

So external device deals only with processor.

 

[Dream.Eater]

first see the definition of interrupt --> A message gone to processor demanding to stop what it is doing and concentrate on external device.

So external device deals only with processor.

So basically when you say external device you mean any device that's under the processor's control?

 

[♣♠ Magnanimous ♣♠]

yup. I think so.

So basically when you say external device you mean any device that's under the processor's control?

 

[Dream.Eater]

Hi
In a computer mock exam , there was a logic gate question where the statement was' A is 1 if P is 1
AND EITHER R is NOT 1......'
could anyone tell me what AND EITHER means and what sort of gate is used in that situation?
Thanks

 

[kirann]

What is rogue website and hyperlinks?

 

[kirann]

can anybody help?
a) what is meant by streaming when watching a video on a computer screen? (2)
b) what is the difference between true(real time streaming) and on demand streaming? (2)
c) to allow high quality video playback during streaming, computers need special software and a way of temporarily saving the data.
describe one piece of software needed and also how data can be stored temporarily (2)
d) give one benefit and one drawback of using streaming to play videos. (2)
plz its needed urgently

 

[sherouk]

i am sorry to disturb you guys but do any one have ICT oct/nov 2003 and 2004 supporting files

 

[Youssef Emad]

Does anyone has the supporting files and question paper for paper 21 ICT june 2014 send me on [email protected] and thanks in advance it is as urgent as possible

please reply quickly

 

[FLRNAB]

can anybody help?
a) what is meant by streaming when watching a video on a computer screen? (2)
b) what is the difference between true(real time streaming) and on demand streaming? (2)
c) to allow high quality video playback during streaming, computers need special software and a way of temporarily saving the data.
describe one piece of software needed and also how data can be stored temporarily (2)
d) give one benefit and one drawback of using streaming to play videos. (2)
plz its needed urgently

a) Source of video is constantly sending video to computer and computer is showing the video simultaneously on the screen.
b) I can't explain it but true streaming is like watching online tv, You cant go back. On demand is like youtube you can replay, rewatch an portion
c) CODEC/Compression software and data can be stored in buffer
d) Drawback is that low quality/ frequent dropouts or pauses. Benefit is that easier to access ( can be watched from anywhere) and one point of distribution so it may save storage space as the video does not need to be copied to pc's to view it.

 

[kirann]

a) Source of video is constantly sending video to computer and computer is showing the video simultaneously on the screen.
b) I can't explain it but true streaming is like watching online tv, You cant go back. On demand is like youtube you can replay, rewatch an portion
c) CODEC/Compression software and data can be stored in buffer
d) Drawback is that low quality/ frequent dropouts or pauses. Benefit is that easier to access ( can be watched from anywhere) and one point of distribution so it may save storage space as the video does not need to be copied to pc's to view it.

thanks

 

[Ruman Wajih]

What is the paper 3 scenario for June 2014....Reply fast

 

[Harsh Poddar]

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[Suchal Riaz]

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