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* [[FACOM 128]] relay calculators at [[Fujitsu]]
* [[IBM 650]] – seven bits
{{anchor|IBM650code}}<!--link from IBM 650 article-->
: 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 is set in a valid digit. In the pictures of the front panel below and in close-up, the bi-quinary encoding of the internal workings of the machine are evident in the arrangement of the lights – the ''bi'' bits form the top of a T for each digit, and the ''quinary'' bits form the vertical stem.
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