Bi-quinary coded decimal: Difference between revisions

Revision as of 15:51, 26 July 2022

Revision as of 07:17, 27 September 2022

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: (the machine was running when the photograph was taken and the active bits are visible in the close-up and just discernible in the full panel picture)

{| cellpadding="5" borderclass="1" style="margin: 0 0 0 4em;wikitable"

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| Value || 05-01234 bits<ref name="Ledley_1960"/>

| rowspan="11" | [[File:IBM-650-panel.jpg|IBM 650 front panel]]

<div class="center" style="width:auto; margin-left:auto; margin-right:auto;{{#if: | {{{style}}};}}">IBM 650 front panel</centerdiv>

[[File:IBM 650 panel close-up of bi-quinary indicators.jpg|thumb|Close-up of IBM 650 indicators]]

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:(sold in the two models [[UNIVAC 60]] and [[UNIVAC 120]])

{| cellpadding="5" borderclass="1" style="margin: 0 0 0 4em;wikitable"

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| Value || 1357-9 bits

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:One ''bi'' bit: 5, three binary coded ''quinary'' bits: 4 2 1<ref name="Steinbuch_1962"/><ref name="Steinbuch-Wagner_1967"/><ref name="Steinbuch-Weber-Heinemann_1974"/><ref name="Dokter_1973"/><ref name="Dokter_1975"/><ref name="Savard_2018_Decimal"/> and one [[parity bit|parity check bit]]

{| cellpadding="5" borderclass="1" style="margin: 0 0 0 4em;wikitable"

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| Value || p-5-421 bits

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:One ''bi'' bit: 5, three [[Johnson counter]]-coded ''quinary'' bits and one parity check bit

{| cellpadding="5" borderclass="1" style="margin: 0 0 0 4em;wikitable"

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| Value || p-5-qqq bits