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 Binary-coded decimal - Wikipedia, the free encyclopedia
Binary-coded decimal (BCD) is, after character encodings, the most common way of encoding decimal digits in computing and in electronic systems.
In the Decimal Architecture IBM 7070, IBM 7072, and IBM 7074 alphamerics were encoded using digit pairs (using two-out-of-five code in the digits, not BCD) of the 10-digit word, with the "zone" in the left digit and the "digit" in the right digit.
In BCD, a digit is usually represented by four (binary) bits, of which the leftmost (written conventionally) has value 8, and the remaining three have values 4, 2, and 1.
en.wikipedia.org /wiki/Binary-coded_decimal   (1233 words)

  
 BCD - Binary-Coded Decimal
Positional notation in which the individual decimal digits expressing a number in decimal notation are each represented by a binary numeral, eg., the number twenty-three is represented by 0010, 0011 in the 8-4-2-1 type of binary coded decimal notation and by 10111 in binary notation.
Binary Coded Decimal is a binary numbering system in which the decimal digits from 0 to 9 are represented by a four bit binary number.
A translation from decimal in dual, a coding system in which each decimal digit from 0 to 9 is represented by four binary digits (0 or 1).
www.auditmypc.com /acronym/BCD.asp   (507 words)

  
 Number Systems
One of the most widely used representations of numerical data is the binary coded decimal (BCD) form in which each integer of a decimal number is represented by a 4-bit binary number (see conversion table).
There are several codes which use binary numbers to code for single digits in multi-digit decimal numbers.
Sometimes it is written "8421 BCD" to clearly distinguish it from other binary codes such as the 4221 Code, but when BCD is used without qualification, the 8421 version is assumed.
hyperphysics.phy-astr.gsu.edu /hbase/electronic/number3.html   (298 words)

  
 The SNIPPETS C collection - file: BCDD.DOC
Binary coded decimal values are typically data downloaded from a mainframe type computer.
The resulting binary coded decimal value is adjusted according to the position, if any, of the decimal point.
SYNOPSIS: #include "toolbox.h" int double_to_bcd(double arg, char *buf, unsigned len, unsigned digits); DESCRIPTION: The double_to_bcd() function converts a numeric value of type double to a signed binary coded decimal format used by IBM mainframe computers.
c.snippets.org /snip_lister.php?fname=bcdd.doc   (295 words)

  
 High-Tech Dictionary Definition
(BCD).A binary-coded notation in which each of the decimal digits is expressed as a binary numeral; for example, in binary-coded decimal notation 12 is 0001 0010, as opposed to 1100 in pure binary.
www.computeruser.com /resources/dictionary/definition.html?lookup=918   (33 words)

  
 Binary coded decimal
coded decimal dewey decimal decimal system visual basic decimal dewey decimal system binary binary conversion binary arts binary calculator binary clock binary code binary translator
Utilities for Programmers A couple of Tcl/Tk based utilities, one to convert numbers between decimal, hexadecimal, octal and binary forms and another to determine which bits are set in a hexadecimal value.
The Formation of Binary Stars Recent observational investigations of the frequency of occurrence of pre-main-sequence binary stars have reinforced earlier suspicions that binary formation is the primary branch of the star-formation process
www.serebella.com /encyclopedia/article-Binary_coded_decimal.html   (372 words)

  
 Binary Clock
But this is actually a binary coded decimal 9 since only values from 0 to 9 are used 0000 to 1001.
Binary digits have only two values (0 and 1) so a number written in binary would be something like 1001 or 0011, which represents decimal numbers 9 and 3 respectively.
This makes binary counting fairly easy since each digit has a value of twice the one before or 1,2,4,8,16,32,64,etc. Thus the decimal value can be found by simply adding the values of each illuminated LED in the same row, (the total is shown in the box to the right).
ourworld.compuserve.com /homepages/Bill_Bowden/clock.htm   (939 words)

  
 EBCDIC - Wikipedia, the free encyclopedia
EBCDIC (Extended Binary Coded Decimal Interchange Code) is an 8-bit character encoding (code page) used on IBM mainframe operating systems, like z/OS, OS/390, VM and VSE, as well as IBM minicomputer operating systems like OS/400 and i5/OS.
It descended from punched cards and the corresponding six bit binary-coded decimal code that most of IBM's computer peripherals of the late 1950s and early 1960s used.
Data stored in EBCDIC require a code page conversion before the text can be viewed on ASCII based machines, like a personal computer.
en.wikipedia.org /wiki/EBCDIC   (813 words)

  
 binary coded decimal from FOLDOC
(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).
Nearby terms: Bill Joy « binaries « binary « binary coded decimal » Binary Compatibility Standard » binary counter » binary data
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.
foldoc.org /?binary+coded+decimal   (112 words)

  
 17.6 Binary Coded Decimal Fixed Point Types
The name of any data type stored and manipulated in decimal digits at the binary level is binary coded decimal or BCD for short.
The code for arithmetic operations will now be considerably more complicated, because the decimal place has to be taken into consideration each time, and each operand can have it in a different place.
Many computers allow for a switch to be set to tell the nibbles to do their carry in a decimal fashion rather than a hexadecimal fashion.
www.csc.twu.ca /rsbook/Ch17/Ch17.6.html   (1323 words)

  
 BCD (Binary Coded Decimal) Number System
This system is called Binary Coded Decimal or BCD which also occupies a nibble.
You merely assign each digit of the decimal number to a byte and convert 0 through 9 to 0000 0000 through 0000 1001, but you cannot perform the repeated division by 2 as you did to convert decimal to binary.
BCD is still a weighted position number system so you may perform mathematics, but we must use special techniques in order to obtain a correct answer.
www.danbbs.dk /~erikoest/bcd.htm   (1134 words)

  
 Binary Coded Decimal
In the case of pure binary considerable manipulation is required to convert the number to and from decimal.
However, with BCD, all that is required is to spilt the decimal digits and feed the BCD directly in the same order.
The advantage of BCD can be seen when you consider input or output of decimal numbers as used on, say, a pocket calculator.
www.colchsfc.ac.uk /computing/computingnotes/numberrep/bcd.html   (566 words)

  
 binary coded decimal. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
BCD A code in which a string of four binary digits represents a decimal number.
www.bartleby.com /61/55/B0255500.html   (79 words)

  
 Intuitor: How to count to 1,023 on your fingers
Binary Coded Decimal (BCD) is a type of numerical representation wherein each digit of a decimal number is represented by a four-digit binary number.
Counting in base sixteen or hexadecimal is similar to counting in binary coded decimal.
So by letting four fingers on each hand represent a binary encoding of a decimal digit, it is possible to count up to 99.
www.intuitor.com /counting   (506 words)

  
 Fast binary coded decimal incrementing circuit - Patent 4256954
The detector circuit is responsive to the sampling circuit, the output of the shift and said control signal for disabling the adder circuit whenever the binary coded decimal digit being outputted from the memory is equivalent to a decimal nine and the control signal is present.
The Fast Binary Coded Decimal Incrementing Circuit of this invention may be used with this ROM chip and thus the description of this chip includes a detailed discussion of the Incrementing Circuit.
An incrementing and binary coded decimal corrector circuit for incrementing and for automatically binary coded decimal correcting in response to a control signal a number stored as a series of bits representing a plurality of binary coded decimal digits in a memory having an output, said circuit comprising:
www.freepatentsonline.com /4256954.html   (5522 words)

  
 Binary-coded decimal
Binary-coded decimal, or BCD, is a method of using binary digits to represent the decimal digits 0 through 9.
You should note in the table above that the BCD coding is the binary equivalent of the decimal digit.
Each decimal digit is converted to its binary equivalent.
www.tpub.com /neets/book13/53s.htm   (451 words)

  
 binary-coded decimal Abbreviated BCD simple sysem for
A simple sysem for converting decimal numbers into binary form, where each decimal digit is converted into binary and then stored as a single character.
In binary numbers, the largest value that can be stored in a single 8-bit byte is 255, and this obiously represents a severe limitation to storing larger numbers.
In BCD, each decimal digit occupies a byte, so three bytes are needed for a three-digit decimal number.
www.ssiltd.co.uk /glossary/details.asp?item=713   (370 words)

  
 Binary Coded Decimal - BCD
Short for Binary Coded Decimal, BCD is also known as packet decimal and is numbers 0 through 9 converted to four digit binary.
Below is a table of the decimal numbers 0 through 9 and the binary conversion.
However, in binary, 25 is represented as 11001.
www.computerhope.com /jargon/b/bcd.htm   (74 words)

  
 BCD - Binary Coded Decimal
A Binary Coded Decimal uses four bits to represent each decimal digit.
www.mpirical.com /companion/Transmission/BCD.htm   (12 words)

  
 BCD Instructions in Assembly Language
Binary coded decimal (BCD) is a method for implementing lossless decimal arithmetic (including decimal fractions) on a binary computer.
Decimal digits (0-9) can be encoded in a nibble (half a byte), with some left over bit patterns (hexadecimal A-F).
Instead of having separate BCD instructions, the normal binary addition and subtraction instructions are used, then hardware instructions are used to adjust the results to correct BCD results.
www.osdata.com /topic/language/asm/bcdarith.htm   (998 words)

  
 Definition: binary-coded decimal notation
binary-coded decimal (BCD) notation: A binary notation in which each of the decimal digits is represented by a binary numeral.
www.atis.org /tg2k/_binary-coded_decimal_notation.html   (57 words)

  
 Binary Coded Decimal Numbers
One system for encoding decimal numbers in a form that allows them to be stored on a computer is called binary coded decimal (BCD).
For example, the decimal fraction 0.6 cannot be stored exactly in straight binary because it is a repeating binary fraction, but it could be stored exactly in BCD.
An advantage to BCD encoding is that conversion between decimal and BCD is easy for humans.
www.mathsci.appstate.edu /~dap/classes/1100/sect1_2.html   (240 words)

  
 4 Bit Binary Coded Decimal (BCD) Clock Display
This converter binary coded decimal clock requires the use of Javascript enabled and capable browsers.
4 Bit Binary Coded Decimal (BCD) Clock Display
The display uses four bits (binary digits, zeros and ones), the rightmost being the ones equivalent, the next to the left, the twos equivalent, the next to the left, the fours equivalent and the leftmost, the eights equivalent.
www.csgnetwork.com /binclock.html   (196 words)

  
 3.1 Binary Coded Decimal (BCD)
We use 10 of the 16 possible combinations when dealing with 4 bits to represent BCD.(Just count to 9 in binary)
BCD uses a 4-bit character to represent 0-9.
www.student.seas.gwu.edu /~cfh/csci135-notes/node23.html   (39 words)

  
 Binary Coded Decimal clock
The binary clock depicted here is in fact a binary coded decimal clock, since its digits are coded separately.
I own a binary watch where hours are coded using 5 bits, minutes using 6 bits and seconds using 6 bits.
The ultimate binary watch requires one more bit, since 86400 (24 * 3600, the amount of seconds since midnight) can't be represented as an unsigned 16 bits integer...
www.oreillynet.com /cs/user/view/cs_msg/50539   (233 words)

  
 Binary Coded Decimal Arithmetic
The representation we will use is called ``binary coded decimal.'' The idea is, instead of representing a number in binary, we'll represent it as an array of decimal digits.
Unless we have an instruction in the instruction set to do it for us - like the DAA (Decimal Adjust A) instruction!
As a last aside, I don't really know whether real calculators as sold today use a BCD representation or a pure binary representation internally.
www.cs.nmsu.edu /~pfeiffer/classes/273/notes/bcd.html   (698 words)

  
 More mind-boggling math: Adding and subtracting unsigned BCD - 9/21/2005 - EDN
Remembering that each BCD digit can only support values of 0000 to 1001 in binary (0 to 9 in decimal), this means a result greater than 9 will cause a carry-out.
This is a perfectly legitimate value for a binary addition, but if we are wishing to perform a BCD operation, we would expect to see a result of 2 (that's 0010 in binary) with a carry-out of 1 from the first nybble.
In decimal, we know that a subtraction operation like +7 – +3 = +4 can also be performed by changing the sign of the subtrahend and inverting the sign of the operation: that is, +7 + (–3) = +4.
www.edn.com /article/CA6258681.html?industryid=42873   (1234 words)

  
 binary coded decimal
A simple system for converting decimal numbers into binary form, in which each decimal digit is converted into binary and then stored as a single character.
www.coffeycountyks.org /Terms/2461HTML-262.html   (26 words)

  
 Packed Binary Coded Decimal Simulation
This model demonstrates Packed Binary Coded Decimal character coding.
Instead of converting each decimal digit to binary every time we process a digit, the different characters and bit patterns are stored in lists once.
Each decimal digit is converted separately to binary, and stored in one nibble.
www.frontiernet.net /~prof_tcarr/BCD/BDC.html   (599 words)

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