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Question
Which of the following is directly controlled from a keyboard?
Which of the following is directly controlled from a keyboard?
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Solution
The correct option is A Card punch
Card punch is directly
controlled from a keyboard
A punched card or punch
card is a piece of stiff paper that can be used to contain digital data
represented by the presence or absence of holes in predefined positions.
Digital data can be used for data processing applications or, in earlier
examples, used to directly control automated machinery.
This can also be done with
electrical sensing: as a punch card passed through a reader, the paper would
break an electrical circuit (one per card-row), but a hole would briefly
reconnect it again, reading a zero or one at each point along the card.
Card punch is directly controlled from a keyboard
A punched card or punch card is a piece of stiff paper that can be used to contain digital data represented by the presence or absence of holes in predefined positions. Digital data can be used for data processing applications or, in earlier examples, used to directly control automated machinery.
This can also be done with electrical sensing: as a punch card passed through a reader, the paper would break an electrical circuit (one per card-row), but a hole would briefly reconnect it again, reading a zero or one at each point along the card.
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