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Browse Prior Art Database

Number Base Converter for Sorting

IP.com Disclosure Number: IPCOM000079380D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Lee, TL: AUTHOR

Abstract

The drawing shows a system for converting a number on a bank check from base 10 to a selected base, 19 through 23. Such a base conversion is used with check sorters of the type that sort multidigit numbers, one digit position at a time. For example, such a sorter would sort a two-digit number by first arranging the checks into ten groups, called "pockets", according to the tens position number, and thereafter sorting within each of these groups according to the units position number. The number of such successive sorts can be reduced by converting the decimal number to a higher base number, for which there are fewer positions.

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Number Base Converter for Sorting

The drawing shows a system for converting a number on a bank check from base 10 to a selected base, 19 through 23. Such a base conversion is used with check sorters of the type that sort multidigit numbers, one digit position at a time. For example, such a sorter would sort a two-digit number by first arranging the checks into ten groups, called "pockets", according to the tens position number, and thereafter sorting within each of these groups according to the units position number. The number of such successive sorts can be reduced by converting the decimal number to a higher base number, for which there are fewer positions.

The system includes a register 8 that holds a field read by the check reader. A register 9 shows the format of a sort control word that controls the operation of converting selected decimal digits in register 8 to a selected base, and loading one digit of the converted base number into an indirect pocket register 10 where it can be used in a subsequent sort operation. Numbers 0 through 7 identify fields of four bits each in the sort control word. Field 0 defines the operation "convert base". Fields 2 and 3 for the convert base control word identify the base of the converted number system, and in response to fields 2 and 3 a central processor loads a store 12 with a table for the conversion. The table is accessed on 16-byte boundaries, where each byte holds a binary representation of a digit in the converted base. Field 4 in regist...