3.1 Binary Coded Decimal (BCD)

• BCD uses a 4-bit character to represent 0-9. We use 10 of the 16 possible combinations when dealing with 4 bits to represent BCD.(Just count to 9 in binary)

  Decimal	BCD
  0	0000
  1	0001
  2	0010
  3	0011
  4	0100
  5	0101
  6	0110
  7	0111
  8	1000
  9	1001

• And as af this weren't already clear enough, an example:
  • ${(9872)}_{10} = 1001\phantom{1}1000\phantom{1}0111\phantom{1}0010$