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{{Use dmy dates|date=May 2019|cs1-dates=y}}
{{anchor|2-out-of-7|quibinary}}<!-- parked anchor for class of 2-out-of-7 codes related to biquinary code and quibinary codes <ref name="MIL_1991"/> has some info on them to be incorporated -->
[[File:Code Biquinaer.svg|thumb|right|One possible binary representation of biquinary code<ref name="Ledley_1960"/>]]
[[File:Code Biquinaer reflektiert.svg|thumb|Reflected biquinary code]]
'''Bi-quinary coded decimal''' is a [[numeral system|numeral encoding scheme]] used in many [[abacus]]es and in some early computers, including the [[Colossus computer|Colossus]].<ref>{{cite web|url=https://www.youtube.com/watch?v=thrx3SBEpL8&list=WL&index=17&t=0s |title=Why Use Binary? - Computerphile |publisher=YouTube |date=2015-12-04 |access-date=2020-12-10}}</ref> The term '''''bi-quinary''''' indicates that the code comprises both a two-state (''bi'') and a five-state (''quin''ary) component. The encoding resembles that used by many abacuses, with four beads indicating either 0 through 4 or 5 through 9 and another bead indicating which of those ranges.
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{| cellpadding="5" border="1" style="margin: 0 0 0 4em;"
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| Value || 05-01234 bits<ref name="Ledley_1960"/>
| rowspan="11" | [[File:IBM-650-panel.jpg|IBM 650 front panel]]
<center>IBM 650 front panel</center>
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<ref name="Stibitz_1957">{{cite book |title=Mathematics and Computers |author-first1=George Robert |author-last1=Stibitz |author-link1=George Robert Stibitz |author-first2=Jules A. |author-last2=Larrivee |date=1957 |edition=1 |publisher=[[McGraw-Hill Book Company, Inc.]] |publication-place=New York, USA / Toronto, Canada / London, UK |___location=Underhill, Vermont, USA |lccn=56-10331 |page=105}} (10+228 pages)</ref>
<ref name="Savard_2018_Decimal">{{cite web |title=Decimal Representations |author-first=John J. G. |author-last=Savard |date=2018 |orig-year=2006 |work=quadibloc |url=http://www.quadibloc.com/comp/cp0203.htm |access-date=2018-07-16 |url-status=live |archive-url=https://web.archive.org/web/20180716101321/http://www.quadibloc.com/comp/cp0203.htm |archive-date=2018-07-16}}</ref>
<ref name="Ledley_1960">{{cite book |title=Digital Computer and Control Engineering |chapter=Part 4. Logical Design of Digital-Computer Circuitry; Chapter 15. Serial Arithmetic Operations; Chapter 15-7. Additional Topics |author-first1=Robert Steven |author-last1=Ledley |author-link1=Robert Steven Ledley |author-first2=Louis S. |author-last2=Rotolo |author-first3=James Bruce |author-last3=Wilson |publisher=[[McGraw-Hill Book Company, Inc.]] (printer: The Maple Press Company, York, Pennsylvania, USA) |publication-place=New York, USA |series=McGraw-Hill Electrical and Electronic Engineering Series |edition=1 |date=1960 |sbn=07036981-X |isbn=0-07036981-X |id={{ISBN|978-0-07036981-8}}. ark:/13960/t72v3b312 |issn=2574-7916 |ol=OL5776493M |lccn=59015055 |oclc=1033638267 |pages=517–518 |url=http://bitsavers.informatik.uni-stuttgart.de/pdf/columbiaUniv/Ledley_Digital_Computer_and_Control_Engineering_1960.pdf |access-date=2021-02-19 |url-status=live |archive-url=https://web.archive.org/web/20210219203314/http://bitsavers.informatik.uni-stuttgart.de/pdf/columbiaUniv/Ledley_Digital_Computer_and_Control_Engineering_1960.pdf |archive-date=2021-02-19 |quote-page=518 |quote=[…] The use of the biquinary code in this respect is typical. The binary part (i.e., the most significant bit) and the quinary part (the other 4 bits) are first added separately; then the quinary carry is added to tne binary part. If a binary carry is generated, this is propagated to the quinary part of the next decimal digit to the left. […]}} [https://archive.org/details/digitalcomputerc00ledl] (xxiv+835+1 pages)</ref>
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