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8421 code
In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each digit is represented by a fixed number of bits, usually four or eight. Sometimes, special bit patterns are used for a sign or other indications (e.g. error or overflow). In byte-oriented systems (i.e. most modern computers), the term ''unpacked'' BCD usually implies a full byte for each digit (often including a sign), whereas ''packed'' BCD typically encodes two digits within a single byte by taking advantage of the fact that four bits are enough to represent the range 0 to 9. The precise four-bit encoding, however, may vary for technical reasons (e.g. Excess-3). The ten states representing a BCD digit are sometimes called '' tetrades'' (the nibble typically needed to hold them is also known as a tetrade) while the unused, don't care-states are named ''pseudo-tetrad(e)s'', ''pseudo-decimals'', or ''pseudo-decimal digits''. BCD's main virtue, in c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Clock
A binary clock is a clock that displays the time of day in a binary numeral system, binary format. Originally, such clocks showed ''each decimal digit'' of sexagesimal time as a binary value, but presently binary clocks also exist which display hours, minutes, and seconds as binary numbers. Most binary clocks are Digital clock, digital, although analog clock, analog varieties exist. True binary clocks also exist, which indicate the time by successively halving the day, instead of using hours, minutes, or seconds. Similar clocks, based on Gray coded binary, also exist. Binary-coded decimal clocks Most common binary clocks use six columns of LEDs to represent 0 (number), zeros and 1 (number), ones. Each column represents a single decimal digit, a format known as binary-coded decimal (BCD). The bottom row in each column represents 1 (or 20), with each row above representing higher powers of two, up to 23 (or 8). To read each individual digit in the time, the user adds the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burroughs B1700
The Burroughs B1000 Series was a series of mainframe computers, built by the Burroughs Corporation, and originally introduced in the 1970s with continued software development until 1987. The series consisted of three major generations which were the B1700, B1800, and B1900 series machines. They were also known as the Burroughs Small Systems, by contrast with the Burroughs Large Systems (B5000, B6000, B7000, B8000) and the Burroughs Medium Systems (B2000, B3000, B4000). Much of the original research for the B1700, initially codenamed the PLP ("Proper Language Processor" or "Program Language Processor"), was done at the Burroughs Pasadena plant. (Bunker, et al.), 1968. Production of the B1700s began in the mid-1970s and occurred at both the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petherick Code
Petherick ( ) may refer to: People * Alice Hext (1865–1939), née Petherick, Cornish landowner * Edward Petherick (1847–1917), Australian book collector * Horace William Petherick (1839-1919). A British artist, book illustrator, violin enthusiast and father of Rosa C. Petherick * John Petherick (1813–1882), Welsh traveller * Maurice Petherick (1894–1985), British politician * Peter Petherick (1942–2015), New Zealand cricketer * Richard Petherick (born 1986), New Zealand hockey player * Rosa C. Petherick (1871–1931), British book illustrator * Vernon Petherick (1876–1945), Australian politician Places * Hundred of Petherick, a cadastral unit in South Australia ** Petherick, South Australia, a locality * Little Petherick, a village and civil parish in Cornwall, England {{disambiguation, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UNIVAC LARC
The UNIVAC LARC, short for the ''Livermore Advanced Research Computer'', is a mainframe computer designed to a requirement published by Edward Teller in order to run hydrodynamic simulations for nuclear weapon design. It was one of the earliest supercomputers. It used solid-state electronics. The LARC architecture supported multiprocessing with two Central processing unit, CPUs (called ''Computer''s) and an input/output (I/O) Processor (called the ''Processor''). Two LARC machines were built, the first delivered to Lawrence Livermore National Laboratory, Livermore in June 1960, and the second to the Navy's David Taylor Model Basin. Both examples had only one CPU, so no multiprocessor LARCs were ever built. Livermore decommissioned their LARC in December 1968 and the Navy's LARC was turned off in April 1969. The LARC CPUs were able to perform addition in about 4 microseconds, corresponding to about 250 kIPS speed. This made it the fastest computer in the world until 1962 when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
