公开(公告)号：US3624375A

公开(公告)日：1971-11-30

申请号：US3624375D

申请日：1969-12-15

Applicant: SINGER CO

Inventor： PROSS JOHN W JR

IPC: H03M7/12 ,  H03K13/24

CPC classification number: H03M7/12

Abstract: A method and means for converting B.C.D. data into pure binary form by utilizing the arithmetic section of a general purpose digital computer. The conversion is based upon the computer''s multiply function wherein the binary-coded decimal information is treated as the multiplier and a preselected set of constants are used as multiplicand. That is, a separate constant for each digit to be converted is accessed from memory every four-word times and multiplied serially bit by bit by the four-binary-coded bits representing the decimal character, low order first. If the multiplier bit is a ''''one,'''' the multiplicand is added and becomes a partial product which, in turn, is stored in the computer''s ''''A'''' register or accumulator and shifted right onebit position. If the multiplier bit is a ''''zero'''' the previous partial product in the accumulator is merely shifted. The various constants or multiplicands are weighted so that each successive one is ten-sixteenths as large as its immediately preceding one.