Digital Electronics/Digital Signal Processing/Binary Coded Decimal

Binary Coded Decimal
Binary Coded Decimal was invented by IBM to encode decimal numbers as 4 bit binary numbers

BCD

 * 0 0000
 * 1 0001
 * 2 0010
 * 3 0011


 * 4 0100
 * 5 0101
 * 6 0110
 * 7 0111


 * 8 1000
 * 9 1001

Number > 9
85 1000 0101