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How would an input spooling system designed to read punched cards from a card reader operate?
I supported such a system many years ago!
Cards (80 bytes each) are read one at a time from the card reader.
The card records are written to a holding file, our system used 8-track magnetic tape for this, but most systems for the last 20 years or so write the data to disk.
When there are no more cards the output file is closed.
Once the output file is closed it is available for the application to read as input. In our installation the input spooling process took place on a fairly small computer (128KB memory - note that is KB not MB or GB!!) and the tapes were later processed on the 'big' machine.
The main advantage was that the applications could run at the very high speed of the tape drives rather than the very very slow speed of the card reader. Also if an application failed (bombed out) then the operators did not have to feed the cards through the reader a second time - an expensive operation if you have 100,000 cards to process!
What else can I help you with?
What was the significance of the punch card?
It is the medium by which people communicate with computers in the olden days. Computer programs are written in punched cards, input data are also written in punched cards. There was a special machine called "card reader" to interpret what were in the punched cards and convert them into machine readable form.
Why do you use keyboards?
Because the computer can't read my thoughts and I need some way to tell it what I want it to do. When I first started using computers you used punched cards to do that and the keypunch that punched the cards had a keyboard but was not connected to the computer. You punched the deck using the keyboard on the keypunch, then took the deck to the computer's card reader.
Why was finger print reader designed?
To read your finger
Which memory card reader is the most compact?
Any Cardbus memory card reader designed for laptops will be very compact and tiny.
Where can I buy an ebook reader?
An e-book reader, also called an e-book device or e-reader, is a portable electronic device that is designed primarily for the purpose of reading digital ...
What is a plate reader used for?
A plate reader (microplate reader) are designed to read and look for chemical, physical or biological substances in microtiter plates. They are used to discover drugs, measure and manufacture in the pharmaceutical industry.
What is the purpose of the hook in a topic sentences?
A hook in a topic sentence is designed to get the reader's attention.
Ask us is the best definition of the hook?
The part of your essay's introduction that is designed to grab your reader's attention
Does an rss reader help children read?
An RSS reader isn't really designed to help children read. A RSS reader is used to pull non formatted information from a website so that it may be re-posted elsewhere. It is commonly used in news tickers.
Why is formatting the works-cited list necessary?
Formatting is designed to make it easier for the reader to locate the sources you used in your essay.
What has the author Bela Bates Edwards written?
Bela Bates Edwards has written: 'The Eclectic Reader: Designed for Schools and Academies'
Is the word reader a common gender?
Yes, the noun 'reader' is a common gender noun as a word for one who reads. The noun 'reader' is a neuter noun as a word for a device that reads or retrieves data, or a book of text designed to give learners of a language practice in reading.
