| slovo | definícia |
coded
(encz) | coded,kódovaný adj: Zdeněk Brož |
coded
(encz) | coded,programovaný adj: Zdeněk Brož |
coded
(encz) | coded,rozlišený adj: Žaneta Veselková |
coded
(encz) | coded,zakódovaný adj: Zdeněk Brož |
coded
(encz) | coded,zašifrovaný adj: Pino |
| | podobné slovo | definícia |
decoded
(encz) | decoded,dekódovaný adj: Zdeněk Brož |
encoded
(encz) | encoded,zakódovaný adj: Zdeněk Brož |
microcoded
(encz) | microcoded,mikrokódovaný adj: Zdeněk Brož |
recoded
(encz) | recoded,překódoval v: Zdeněk Brož |
binary coded decimal
(foldoc) | binary coded decimal
BCD
packed decimal
(BCD, packed decimal) A number representation where a
number is expressed as a sequence of decimal digits and then
each decimal digit is encoded as a four-bit binary number (a
nibble). E.g. decimal 92 would be encoded as the eight-bit
sequence 1001 0010.
In some cases, the right-most nibble contains the sign
(positive or negative).
It is easier to convert decimal numbers to and from BCD than
binary and, though BCD is often converted to binary for
arithmetic processing, it is possible to build hardware that
operates directly on BCD.
[Do calculators use BCD?]
(2001-01-27)
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coded character set
(foldoc) | coded character set
A mapping, generally 1:1, from a set of
integers, known as character codes or code positions, to
a set of characters that may include letters, digits,
punctuation, control codes, mathematical and typographic
symbols.
There are several standard coded character sets, the most
widely used is ASCII, generally in its Latin-1 dialect,
with Unicode becoming slowly more common; while EBCDIC and
Baudot are extinct except in legacy systems.
(2009-01-06)
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extended binary coded decimal interchange code
(foldoc) | Extended Binary Coded Decimal Interchange Code
EBCDIC
/eb's*-dik/, /eb'see`dik/, /eb'k*-dik/,
/ee`bik'dik`/, /*-bik'dik`/ (EBCDIC) A proprietary 8-bit
character set used on IBM dinosaurs, the AS/400, and
e-Server.
EBCDIC is an extension to 8 bits of BCDIC (Binary Coded
Decimal Interchange Code), an earlier 6-bit character set used
on IBM computers. EBCDIC was [first?] used on the successful
System/360, anounced on 1964-04-07, and survived for many
years despite the almost universal adoption of ASCII
elsewhere. Was this concern for backward compatibility or,
as many believe, a marketing strategy to lock in IBM
customers?
IBM created 57 national EBCDIC character sets and an
International Reference Version (IRV) based on ISO 646 (and
hence ASCII compatible). Documentation on these was not
easily accessible making international exchange of data even
between IBM mainframes a tricky task.
US EBCDIC uses more or less the same characters as ASCII,
but different code points. It has non-contiguous letter
sequences, some ASCII characters do not exist in EBCDIC
(e.g. square brackets), and EBCDIC has some (cent sign,
not sign) not in ASCII. As a consequence, the translation
between ASCII and EBCDIC was never officially completely
defined. Users defined one translation which resulted in a
so-called de-facto EBCDIC containing all the characters of
ASCII, that all ASCII-related programs use.
Some printers, telex machines, and even electronic cash
registers can speak EBCDIC, but only so they can converse with
IBM mainframes.
For an in-depth discussion of character code sets, and full
translation tables, see {Guidelines on 8-bit character codes
(ftp://ftp.ulg.ac.be/pub/docs/iso8859/iso8859.networking)}.
{A history of character codes
(http://tronweb.super-nova.co.jp/characcodehist.html)}.
(2002-03-03)
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hard-coded
(foldoc) | hard-coded
(By analogy with "hard-wired") Said of a data value
or behaviour written directly into a program, possibly in
multiple places, where it cannot be easily modified. There
are several alternatives, depending on how often the value is
likely to change. It may be replaced with a compile-time
constant, such as a C "#define" macro, in which case a
change will still require recompilation; or it may be read at
run time from a profile, resource (see de-rezz), or
environment variable that a user can easily modify; or it
may be read as part of the program's input data.
To change something hard-coded requires recompilation (if
using a compiled language of course) but, more seriously, it
requires sufficient understanding of the implementation to be
sure that the change will not introduce inconsistency and
cause the program to fail.
For example, "The line terminator is hard-coded as newline;
who in their right mind would use anything else?"
See magic number.
[Jargon File]
(1999-10-18)
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phase encoded
(foldoc) | Phase Encoded
(PE) A recording method used for 1600 BPI {magnetic
tapes}.
Compare NRZI, GCR.
(1996-02-03)
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hardcoded
(jargon) | hardcoded
adj.
1. [common] Said of data inserted directly into a program, where it cannot
be easily modified, as opposed to data in some profile, resource (see {
de-rezz} sense 2), or environment variable that a user or hacker can
easily modify.
2. In C, this is esp. applied to use of a literal instead of a #define
macro (see magic number).
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