Term
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Definition
| a group of numbers that is input with the original numbers to check to see if there are any errors in the numbers if they don;t match |
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Term
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Definition
| Used to check long numbers, it is an extra digit put on the end of the numbers to check if it has been input correctly. |
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Term
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Definition
| Checking to make sure that data is in correctly. Two people enter the same data on differnt computers, they then check the data an if it doesn;t match it is rejected |
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Term
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Definition
| Checks which are carried out by software to make sure data is sensible and allowable, Any that isn;t is rejected. |
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Term
| Some examples of validation check? |
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Definition
| Range, Type,Length, Parity |
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Term
| What are some manual input devices? |
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Definition
| Keybaord, joystick, scanner, digital camera |
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Term
| What are some Direct Input Devices? |
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Definition
| Barcode Reader, sensor, MICR |
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Term
| What are the 3 types of software? |
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Definition
| System, utility,application |
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Term
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Definition
| Runs the computer, deals with file managment |
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Term
| What is Utility software? |
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Definition
| Performs a task related to the computer e.g. disk scan, antivirus |
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Term
| What is application software? |
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Definition
| Helps the user use for a specific task. e.g microsoft word or access |
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Term
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Definition
| Programable Read Only Memory- Can be programmed but not changed |
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Term
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Definition
| erasable programmable read only memory, can be programmed and changes when necessary |
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Term
| What is a hard disk drive? |
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Definition
| circular metal disk coded with magnetic material, usually sealed in inside the computer. Data can be acessed more quickly on a hard disk than floppy |
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Term
| What is real time processing? |
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Definition
| When data files are updated as soon as new information is entered. |
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Term
| When should real time processing be used? |
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Definition
| Whenever it is important to have information processed without delay. E.g when booking a seat on an airplane |
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Term
| What is bacth processing? |
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Definition
| When lots of differnt jobs are stored up and then all processed together at the same time. |
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Term
| When should bacth processing be used? |
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Definition
| When there are large volumes of data to be processed at regular intervals. Eg large businesses when they pay there wages. |
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Term
| What is transaction processing? |
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Definition
| Individual data files are updated in response to individual responses. |
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Term
| When would transaction processing be used? |
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Definition
| Eg. If someone wanted to cancel their subscription to a magazine and the publisher processed their file work out of the person still owed money. |
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