binary coded decimal

(redirected from BCDS)
Also found in: Dictionary, Medical, Acronyms, Wikipedia.

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.

This article is provided by FOLDOC - Free Online Dictionary of Computing (


(Binary Coded Decimal) The storage of numbers in which each decimal digit is converted into a binary number and stored in a single 8-bit byte. For example, a 12-digit decimal number would be represented as 12 bytes. BCD uses more storage for numbers than binary encoding (see below). Prior to 8-bit bytes in the 1960s, BCD encoding used 6-bit characters. See binary numbers and byte.

BCD and Binary
The BCD method codes each decimal digit in binary and stores it in its own byte. The binary method converts the entire decimal number into a binary number. In the binary example above, the 1 in the left byte is the ninth bit starting from the rightmost bit in the right byte (1-2-4-8-16-32-64-128-256-512-1024-2048-4096-8192-16384-32768).

How Numbers Are Stored
BCD is one of four primary ways numbers are stored in the computer.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Under the terms of the deal, which was unveiled in December 2012, BCD's common shares and American depositary shares (ADS) were converted into the right to receive cash.
Diodes expects the transaction to have an immediate positive impact on its GAAP earnings per share.Country: Cayman IslandsSector: ElectronicsTarget: BCD Semiconductor Manufacturing LtdBuyer: Diodes Inc Deal size in USD: 151mType: Corporate acquisitionStatus: Closed
The buyer expects the transaction to immediately add to its GAAP EPS, while enhancing its analog product portfolio and expanding its presence in Asia through BCD's strong footprint in China, it said.