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Punch Card: Punched Card, List of Ibm Products, Chad, Lace Card, Keypunch, Unit Record Equipment, Tabulating Machine
 (

ISBN 9781155639635
REGISTERED: 01/13/18
UPDATED: 12/04/20
Punch Card: Punched Card, List of Ibm Products, Chad, Lace Card, Keypunch, Unit Record Equipment, Tabulating Machine
Rank: 9%
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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Punched Card, List of Ibm Products, Chad, Lace Card, Keypunch, Unit Record Equipment, Tabulating Machine, Ibm 80 Series Card Sorters, Mark Sense, Bit Bucket, Punched Card Reader, Card Punch, Ibm 1442. Excerpt: The bit bucket is jargon for where lost computerized data has gone, by any means; any data


Specifications
  • ISBN bar code 9781155639635 ξ1 registered April 21 2016
  • Product category is Punch-Card Books-LLC Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Punched Card, List of Ibm Products, Chad, Lace Card, Keypunch, Unit Record Equipment, Tabulating Machine, Ibm 80 Series Card Sorters, Mark Sense, Bit Bucket, Punched Card Reader, Card Punch, Ibm 1442. Excerpt: The bit bucket is jargon for where lost computerized data has gone, by any means; any data which does not end up where it is supposed to, being lost in transmission, a computer crash, or the like, is said to have gone to the bit bucket that mysterious place on a computer where lost documents go, as in: "What happened to that important spreadsheet that I was just editing?" "Oh, it went into the bit bucket." The chip receiver (or "bit bucket") from a UNIVAC key punch. Originally, the bit bucket was the container on teletype machines or IBM key punch machines into which chad from the paper tape punch or card punch was deposited; the formal name is "chad box" or (at IBM) "chip box". The term was then generalized into any place where useless bits go including the trash can or rubbish bin. In Unix and Unix-like operating systems, this term is used to refer to /dev/ . In OpenVMS, this term refers to SYS $:. On Univac 90/60 operating systems such as VS/9, it was referred to as "*DUMMY". On the DEC PDP-11, it was known as "NL:". On DOS and Windows, it is referred to as "NUL". The bit bucket is also used in discussions of bit shift operations. When the width of a given binary number is fixed, one or more bits are lost when performing a simple shift. These bits are said to have "fallen off" or to have "fallen into the bit bucket". Such a device is sometimes referred to as a "write once read never" or WORN device (named after the magneto-optical WORM devices used during the 80s), and was indeed implemented as such as an Easter egg in early


References
    ^ Punch Card: Punched Card, List of Ibm Products, Chad, Lace Card, Keypunch, Unit Record Equipment, Tabulating Machine (revised Dec 2020)

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