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Toggle the table of contents. Hollerith constant. 1 language. ... Download QR code; Print/export Download as PDF; ... 4.2.6 Hollerith Type. A Hollerith datum is a ...
A 12-row/80-column IBM punched card from the mid-twentieth century. A punched card (also punch card [1] or punched-card [2]) is a piece of card stock that stores digital data using punched holes.
Two-pass verification, also called double data entry, is a data entry quality control method that was originally employed when data records were entered onto sequential 80-column Hollerith cards with a keypunch. In the first pass through a set of records, the data keystrokes were entered onto each card as the data entry operator typed them.
Hollerith started his own business as The Hollerith Electric Tabulating System, specializing in punched card data processing equipment. [10] In 1896 he incorporated the Tabulating Machine Company. In that year he introduced the Hollerith Integrating Tabulator, which could add numbers coded on punched cards, not just count the number of holes.
A single program deck, with individual subroutines marked. The markings show the effects of editing, as cards are replaced or reordered. Many early programming languages, including FORTRAN, COBOL and the various IBM assembler languages, used only the first 72 columns of a card – a tradition that traces back to the IBM 711 card reader used on the IBM 704/709/7090/7094 series (especially the ...
Note: Most IBM form numbers end with an edition number, a hyphen followed by one or two digits. For Hollerith and Hollerith's early machines see: Herman Hollerith#Further reading. Histories. Aspray, William, ed. (1990). Computing before Computers. Iowa State University Press. p. 266. ISBN 0-8138-0047-1. Brennan, Jean Ford (1971).
Alphabetic columns have a zone punch in rows 12, 11, or 0 and a digit punch in one of the rows 1-9, and can be sorted by passing some or all of the cards through the sorter twice on that column. For more details of punched card codes see punched card#IBM 80-column format and character codes.
For Jacquard looms, the resulting punched cards were joined together to form a paper tape, called a "chain", containing a program that, when read by a loom, directed its operation. [1] For Hollerith machines and other unit record machines the resulting punched cards contained data to be processed by those machines.