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- Keypunch abstract "A keypunch is a device for precisely punching holes into stiff paper cards at specific locations as determined by keys struck by a human operator. For Jacquard looms, the resulting punched cards contained the program directing a loom's operation.For Hollerith machines, other unit record machines, and computers, the resulting punched cards contained data to be processed by unit record machines and, later, computers equipped with punched card input/output devices.Early Hollerith keypunches were manual devices. Later keypunches were electromechanical devices which combined several different functions in one unit. These often resembled small desks with keyboards similar to those on typewriters and were equipped with hoppers for blank cards and stackers for punched cards. Some keypunch models could print, at the top of a column, the character represented by the hole(s) punched in that column. The small pieces punched out by a keypunch fell into a chad box, or (at IBM) chip box, or bit bucket.In many data processing applications, the punched cards were verified by keying exactly the same data a second time, checking to see if the second keying and the punched data were the same (known as two pass verification). There was a great demand for keypunch operators, usually women, who worked full-time on keypunch and verifier machines, often in large keypunch departments with dozens or hundreds of other operators.Keypunches were popular through the 1970s but were rapidly made obsolete by changes in the data input paradigm and by the availability of inexpensive CRT computer terminals.".
- Keypunch thumbnail Card_puncher_-_NARA_-_513295.jpg?width=300.
- Keypunch wikiPageExternalLink valueone_railroad.html.
- Keypunch wikiPageExternalLink vintage_4506VV4002.html.
- Keypunch wikiPageExternalLink A24-0520-2_24-26_Keypunches.pdf.
- Keypunch wikiPageExternalLink A24-1018-1_56_Verifier.pdf.
- Keypunch wikiPageExternalLink 026.html.
- Keypunch wikiPageExternalLink keypunch.html.
- Keypunch wikiPageExternalLink pcaa.
- Keypunch wikiPageExternalLink IBM-011-ElectricPunch-ServiceManual.pdf.
- Keypunch wikiPageExternalLink IBM029-Field-Eng-Maint-Man-r.pdf.
- Keypunch wikiPageID "856718".
- Keypunch wikiPageRevisionID "605780411".
- Keypunch hasPhotoCollection Keypunch.
- Keypunch subject Category:IBM_keypunches.
- Keypunch subject Category:Punched_card.
- Keypunch subject Category:UNIVAC_unit_record_equipment.
- Keypunch subject Category:Unit_record_equipment.
- Keypunch comment "A keypunch is a device for precisely punching holes into stiff paper cards at specific locations as determined by keys struck by a human operator.".
- Keypunch label "Kaartponser".
- Keypunch label "Keypunch".
- Keypunch label "Lochkartenlocher".
- Keypunch label "Perforadora de tarjetas".
- Keypunch label "Perforatrice".
- Keypunch label "Perfurador de cartão".
- Keypunch label "خرامة".
- Keypunch label "キーパンチ".
- Keypunch sameAs Lochkartenlocher.
- Keypunch sameAs Perforadora_de_tarjetas.
- Keypunch sameAs Perforatrice.
- Keypunch sameAs キーパンチ.
- Keypunch sameAs Kaartponser.
- Keypunch sameAs Perfurador_de_cartão.
- Keypunch sameAs m.03hq6f.
- Keypunch sameAs Q2040518.
- Keypunch sameAs Q2040518.
- Keypunch wasDerivedFrom Keypunch?oldid=605780411.
- Keypunch depiction Card_puncher_-_NARA_-_513295.jpg.
- Keypunch isPrimaryTopicOf Keypunch.
