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Aiken code — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Aiken_code
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T21:11:19.295Z
SHA-256 of the archived text: adaf6e02de77dec1f1adf2cf95c02bfc7604b252111bc37f3609a0836d9c7bcc
Stable URL of this page: https://metraipolis.com/documento/dc_bfa8955065eb

How to cite

Aiken code — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Aiken_code (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_bfa8955065eb (Metraipolis archive dc_bfa8955065eb, sha256 adaf6e02de77dec1f1adf2cf95c02bfc7604b252111bc37f3609a0836d9c7bcc)

BibTeX

@misc{dcbfa8955065eb,
  title = {Aiken code — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Aiken_code},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_bfa8955065eb; sha256 adaf6e02de77dec1f1adf2cf95c02bfc7604b252111bc37f3609a0836d9c7bcc},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Aiken_code. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The Aiken code (also known as 2421 code) is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table. The code was developed by Howard Hathaway Aiken and is still used today in digital clocks, pocket calculators and similar devices. The Aiken code differs from the standard 8421 BCD code in that the Aiken code does not weight the fourth digit as 8 as with the standard BCD code but with 2. The following weighting is obtained for the Aiken code: 2-4-2-1. One might think that double codes are possible for a number, for example 1011 and 0101 could represent 5. However, here one makes sure that the digits 0 to 4 are mirror image complementary to the numbers 5 to 9.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Aiken code» — https://en.wikipedia.org/wiki/Aiken_code
Wikidata Q117643: «complementary binary-coded decimal which assigns a group of 4 bits to each decimal digit: 0→0000, 1→0001, 2→0010, 3→0011, 4→0100, 5→1011, 6→1100, 7→1101, 8→1110, 9→1111» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q117643
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Aiken_code?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1196898676, consultata il 2026-11-07T21:07:05.729Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 9c51ad1f2bb1f2e933e7fe4795c8d5a49d0386736681fc33fad257c2ef9f2e3b