Browse Prior Art Database

Multiplying System

IP.com Disclosure Number: IPCOM000094794D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Taylor, RW: AUTHOR

Abstract

In a microprogram controlled computer, parts of the data flow can be directed to the read-only storage address register in order to force a branch into a particular routine.

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Multiplying System

In a microprogram controlled computer, parts of the data flow can be directed to the read-only storage address register in order to force a branch into a particular routine.

This principle can be used in a table look-up multiplication operation where the operands are coded in a notation other than pure binary. In such an operation, multiples of the multiplicand are formed and held in separate storage locations to form the table. Each digit of the multiplier is then directed to the read- only storage address register so that, according to the value of the digit, a particular one of several different subroutines is directly selected. This subroutine selects the correct stored multiplicand multiples and adds them to form a partial product.

For a machine operating in hexadecimal code, multiplicand times one, times two, times three and times six multiples are used.

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