AS computing 2011 July Batch

[Ravichandran]

Dear all,

            Welcome to AS computing class. I am Dr.Ravi your facilitator for this course. This course consists of two modules, theory and practicals. In theory we will have 12 chapters and in practicals we do have programming classes. You will sit for theory and practical exams at the end of the course, which is conducted by CIE.

All the best, keep moving, for there is always a helping hand above you to guide you.

Dr.Ravi

 

[Dain Razali]

Yeah, i got it wrong here. Didn't notice...Thanks Afifah. Only processor and secondary storage devices

send interrupt signals to each other.

Afifah Ahmad said:

its not the buffer that sends the interrupt, its the processor or the hard disk that gives the interrupt to inform that the other that they need to send more data i think

Mohamed Faiz bin Mohamed Razali said:

The buffer sends an interupt to ask for more data and to ask to stop sending data right?

Dain Razali said:

Most devices such as printers come with buffers. Buffers are usually at places where there is a difference between the transfer speed of 2 devices( where 1 is slower of faster than the other). One example of the use of a buffer is during data transfer from the Primary Memory ( Random Access Memory-RAM) to the Secondary Memory a.k.a Secondary Storage ( ROM ) and vice versa. For example, when we open a file in the computer, the operating system finds the data needed extracts it from the secondary storage. Since the transfer speed of secondary storage devices are extremely slow compared with that of the processor, the data is sent to the buffer while the processor carries on with other work to ensure the computer runs more efficiently. This is because if the data is sent from the secondary storage directly to the processor, the processor has to extract the data at the same speed as the secondary storage and is not free to do anything else. Hence, the buffer eliminates this problem. Once the buffer is full, it sends an 'interrupt signal' to the CPU (processor) to inform it that it is ready to transfer the data. Therefore, the data is then sent to the CPU at the same speed(speed of the processor) from the buffer and the CPU sends it to the RAM to be used. The buffer works the same the other way round too, where data from the RAM is sent to the CPU which transfers it to the buffer, and then the buffer saves it in the secondary storage. I hope I got it right... :/

Afifah Ahmad said:

hmm wat we learned yesterday was about utility programs, software, buffer, RAM, ROM (if i 4get 2 add anything pliz add it up ok)

utility programs 

-extra routines that are added to the operating system

-system programs are counted as utility

 

application software

-designed for specific tasks

-application packages = designed for specific tasks with user manual included

-tailor-made software = designed for specific users

-general purpose packages = for general purposes

 

integrated software

-consists of several parts and data can be shared between the application package

e.g. in microsoft office, when we use word, we can share the datas there into excel & powerpoint, but we cannot share the datas with adobe or notepad

 

SOMEONE UPDATE ABOUT BUFFER, ROM and RAM ok? 

 

[Muhammad Mujahid Lokman]

We know that the application software has 3 main types which is

-Application packages

-Tailor-made software

-General purpose software

 

can anyone tell me what is the example of tailor-made software?

[3pi2mqtqk0utu]

micr use somekind of detector to detect the presence of magnetic subtance in the paper..while omr use someking of optical detector( such as camera or laser) to detect the character on the paper...

Nadia Nadhira Airisal said:

Whats the difference of MICR and OMR ?

Afifah Ahmad said:

advantage of MICR

-can be read by both human and computer

-can detect forgery

disadvantage of MICR

-the ink is very expensive

Azrin Syaqir said:

input devices-magnetic ink character recognition...
Nadia Nadhira Airisal said:

Input devices =
Input devices are different pieces of hardware that are used to transfer data from the user to the processor 

Example of input devices =
mouse, keyboard, joystick , etc.

 

Output devices =
Output devices are any piece of computer hardware equipment used to transfer data from the processor to the user 

Examples = monitor, printer , speakers

 

Anything else to add ? 

 

[Afifah Ahmad]

dont u think its a bit um, mixed up, the info that we are putting here? i suggest we start discussing one topic at a time. what do u guys think? lets start with

-hardware

-software

-data types

-storage devices etc.

-buffering thingy

or anyway u guys want it to be XD

[Dain Razali]

Yeah,it's kinda jumbled up. Could get confused if ur not careful~~ so i guess one problem at a time yeah??? Seems like a good idea.

Afifah Ahmad said:

dont u think its a bit um, mixed up, the info that we are putting here? i suggest we start discussing one topic at a time. what do u guys think? lets start with

-hardware

-software

-data types

-storage devices etc.

-buffering thingy

or anyway u guys want it to be XD

[Nadia Nadhira Airisal]

So , lets start with hardware then ..

[Afifah Ahmad]

in hardware, we learnt about input devicees and output devices

what is an input device?

what is an output device?

answer guysss!

[3uxiax8uu3t9h]

Input devices are different pieces of hardware that are used to transfer data from user to the processor

For example : keyboard, mouse, MCR, OCR

Output devices are different pieces of hardware that are used to transfer data from processor to the user.

For example : Monitor, speaker

[Dain Razali]

Hmm, Input and output devices are some examples of hardware. Hardware is the 'physical' part of a computer system, meaning it can be seen. Other examples are the processor and storage devices.

[Dain Razali]

Input device=a piece of hardware that transfers data from the user to the computer processor.

Output device=a piece of hardware that transfers data from the processor to the user.

generally, just remember that input means data going into the processor and output means data extracted out of the processor.

Afifah Ahmad said:

in hardware, we learnt about input devicees and output devices

what is an input device?

what is an output device?

answer guysss!

[3uxiax8uu3t9h]

Dain, What is MCR and OCR ?

[Dain Razali]

Magnetic Ink Character Recognition (MICR) & Optical Character Recognition (OCR) are two important examples of input devices. Well, technically MICR detects writing and data from checks using magnetic properties of some sort. This is because the numbers on a check are printed in magnetic ink  and therefore the MICR can detect and read the numbers. OCR's, as the name suggests, uses an optical lens to read characters.I hope this helps, Asyraf... :)

Asyraf Naim bin Jamal Shahid said:

Dain, What is MCR and OCR ?