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Binary Coded Decimal To Binary Translator

IP.com Disclosure Number: IPCOM000097857D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Anderson, RA: AUTHOR [+2]

Abstract

The translator makes a straight binary memory compatible with a binary coded decimal computing system.

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Binary Coded Decimal To Binary Translator

The translator makes a straight binary memory compatible with a binary coded decimal computing system.

The translation from BCD to straight binary is accomplished by disregarding the numerical equivalents between the two binary numbers. The simplest method of translation is to provide a unique combination of binary digits for each binary coded decimal address. At least the lowest order binary digit of each decimal order is transferred directly to the binary register 15. Seven lines are taken directly, giving one hundred twenty-eight unique binary combinations. The remaining nine lines entering translator 20 are then converted to a unique binary combination for each of the possible one hundred twenty-five permutations of those lines.

The highest binary digit of each of the binary coded decimal orders to be translated is sampled and, in accordance with the eight possible combinations, the highest binary digit can take in all the binary coded decimal orders.

Boolean equations can be written for each of the seven output lines B7... B13 of translator 20 and from these equations AND and OR circuits are combined to give the desired result. This is a unique binary combination for each of the possible permutations of the nine input lines. Translator 20 utilizes only a level of AND circuits and a level of OR circuits.

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