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Punched card with the Hollerith encoding of the 1964 EBCDIC character set. Contrast at the top is enhanced to show the printed characters. The "number" punches (0–9) directly translate to the lower 4 bits of EBCDIC, though the upper 4 bits of EBCDIC are more complex.
A presentation program is commonly used to generate the presentation content, some of which also allow presentations to be developed collaboratively, e.g. using the Internet by geographically disparate collaborators. Presentation viewers can be used to combine content from different sources into one presentation.
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Depending on the programming language, debugging output statements could be quickly activated and "commented out" by using cards with such statements punched with the comment character (e.g., 'C' in Fortran) in column 80 of the card; turning the card end-for-end would put the 'C' in the leading column, which transformed the now backwards card's ...
Different types of the punch and bind binding include: Double wire, twin loop, or Wire-O binding is a type of binding that is used for books that will be viewed or read in an office or home type environment. The binding involves the use of a C-shaped wire spine that is squeezed into a round shape using a wire closing device.
An IBM 80-column punched card of the type most widely used in the 20th century IBM 1442 card reader/punch for 80 column cards. A computer punched card reader or just computer card reader is a computer input device used to read computer programs in either source or executable form and data from punched cards.
A set screw holds each fitting in position. There may be marks on the device to identify standard hole positions. There may be positions where a punch head will not make contact with the activating handle, allowing holes to be "turned off". Some punch designs use hollow punch heads (a thin-walled tube), with the edge a sharpened blade. This ...