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Bi-quinary Coded Decimal
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Several different representations of bi-quinary coded decimal have been used by different machines. The two-state component is encoded as one or two Bit s, and the five-state component is encoded using three or five bits. Some examples are:

  • IBM 650 – 7 bits (two ‘bi’ bits: 0 5 and five ‘quinary’ bits: 0 1 2 3 4) with error checking (exactly one ‘bi’ bit and one ‘quinary’ bit set in a valid digit); in the picture of the front panel below, the bi-quinary encoding of the internal workings of the machine are evident in the arrangement of the lights (active bits are just visible)



    • Value05-01234 Bits

    IBM 650 front panel

    0 10-10000
    1 10-01000
    2 10-00100
    3 10-00010
    4 10-00001
    5 01-10000
    6 01-01000
    7 01-00100
    8 01-00010
    9 01-00001





    Valuep-5-421 bits
    0 1-0-000
    1 0-0-001
    2 0-0-010
    3 1-0-011
    4 0-0-100
    5 0-1-000
    6 1-1-001
    7 1-1-010
    8 0-1-011
    9 1-1-100


    • Univac coded ‘quinary’ bits) with 1 parity check bit


      • Valuep-5-qqq bits
      0 1-0-000
      1 0-0-001
      2 1-0-011
      3 0-0-111
      4 1-0-110
      5 0-1-000
      6 1-1-001
      7 0-1-011
      8 1-1-111
      9 0-1-110



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