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Focus review



Focus G Time sequence

First complete the following table referring back to the text on

'Cards, Readers and Keyboards'.

 

TIME SEQUENCE MARKER INFORMATION
1. Punched cards were used on textile machinery
2. The first application of punched cards for the representation of large amounts of data

Now re-order the following information so that the events appear in the same sequence as in the text. (Number the events 1-5.) Refer back to paragraphs 7 and 8 of'Cards, Readers and Keyboards'.

a. Once the information has been punched on the cards, they are ready to be read.

b. After this has been done, the information is read by a photosensitive light.

c. Information is usually entered on cards in the Hollerith code or some other code.

d. Modern card readers can read about 2,000 cards per minute.

e. The cards are then stacked in the card reader.

Focus J Giving an explanation or definition

In the following sentences, which were taken from the text on 'Cards, Readers and Keyboards', underline the part of the sentence which gives an explanation or a definition, then circle the term which is being explained or denned.

Example

Until the early 1960s, one of the most frequently used devices for providing input data to computer was the(punched card^)a major storage medium for computer programs and data.

1. Dr. Hollerith went on to found a company to produce these machines, which in 1924 became International Business Machines, or IBM for short.

2. The keypunch, which looked like a large typewriter, was not physically connected to the computer.

3. Cards could be used for storing binary information, with a hole representing 1, and a no hole, 0.

4. The card reader was actually attached to the computer by wires; hence it is on-line.


FOCUS K




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