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binary coded decimal
(redirected from Binary-coded decimal)

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
(data)binary coded 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.



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Is the invention in actuality only a mathematical algorithm, such as a computer program designed to convert binary-coded decimal numbers into binary numbers?
Protocol converters became hot items in 1983 for two reasons: they can reduce the cost of a network by substituting standard asynchronous ASCII terminals, and especially printers, for more-expensive synchronous EBCDIC (extended binary-coded decimal exchange) devices; and their bridging and switching functions allow one communications network to interconnect different types of computers (sync and async) and to serve both with only one terminal per workstation.
The seconds, minutes, hours, days, weekdays, months and years registers are all coded in binary-coded decimal (BCD) format for easy conversion to decimal digits for printing or display and faster decimal calculations.
 
 
 
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