Tools to code/decode in BCD. BCD (binary coded decimal) is a numeration system used in electronics and informatics to code decimal numbers on 4 bits (in binary).

Binary Coded Decimal (BCD) - dCode

Tag(s) : Electronics, Informatics

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Tools to code/decode in BCD. BCD (binary coded decimal) is a numeration system used in electronics and informatics to code decimal numbers on 4 bits (in binary).

Encryption replaces directly digits 0,1,2,...9 by values 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000 and 1001

One want to code 123 : 1 => 0001, 2 => 0010 et 3 => 0011

123 is coded 0001 0010 0011 in BCD

Decryption replaces 4bit groups by the associated digit

0001 0010 0011 is decoded 1,2,3

The message has a length multiple of 4 and never contains 1111.

Some systems uses 1100 for + and 1101 for -

-5 is then written 1101 0101

It is possible to use 1100,1101 or 1110 for the decimal dot, bu more often the position of the decimal dot is fixed a priori.

For example, id the dot is in 2nd position, 123 will be read 1.23.

BCD is often used in electronics, for storing or displaying numeric values. Conversion is easy, does not need a processor and is similar to peripherals such as 7-segment displays.

Another example is the storing of Dates in a BIOS of a motherboard, still today in BCD.

Unused values are 1010, 1011, 1100, 1101, 1110, 1111

Between 1950 and 1960

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