Lesson 11 data recording media
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Punched cards were an early form of computer input and output media that stored data by punching holes in specific positions according to the Hollerith Code. While punched cards allowed both humans and machines to read data and provided low-cost, reusable storage, they were also bulky and prone to mechanical failures with low processing speeds. Common computer output methods included printed documents, diskettes, paper tape, magnetic tape, and cassette tape.
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Lesson 11 data recording media
- 2. Punched CardA form of computer input and output media . It is used to :Provide data input into the CPUReceive information output from the CPUProvide secondary off-line storage of data and information
- 3. Hollerith CodeThe holes in punch cards are punched according to a codeEach character in this code is represented by a unique combination of punched holes.
- 4. Advantages of Punched CardsPeople, as well as machine, can read card dataRelatively low costCan be used as a turnaround document
- 5. Disadvantages of Punched CardsLarge Volumes of cards are difficult to controlMechanical parts of many card devices cause frequent breakdowns.Low speed of card reader and punch devices.Inflexibility of the card format.Cards are not reusable
- 6. Printed OutputIs one of the major forms of computer outputMost commonly distributed to users and is used primarily as an end product
- 7. Diskette
- 8. Paper tape
- 10. Cassette Tape