Apparatus for calculating a check digit for a stream of data rea

Details Apparatus for calculating a check digit for a stream of data rea Apparatus for calculating a check digit for a stream of data rea

1979-12-31

1982-04-13

Shaw, Gareth D.

Boots, shoes, and leggings

371 53, G06F 1108

Patent

active

043251170

ABSTRACT:
Information from a document is read by a reader sorter; the information is organized in fields including a transit field which is made up of 8 decimal digits and a check digit. The 8 decimal digits are each multiplied by a predetermined number which depends on the position of the decimal digit in the transit field as indicated by a position counter. Signals indicative of the decimal digit and the position in the transit field are applied to the address terminals of a Programmable Read Only Memory (PROM). Each address location stores the units position of the product of the multiplication of the decimal digit times the predetermined value. A firmware routine stored in a control memory performs the check digit calculation "on the fly" using the units position of the product from the PROM and certain status bits stored in a scratchpad memory.

REFERENCES:
patent: 3484744 (1969-12-01), Gertler et al.
patent: 3675202 (1972-07-01), Verhoeff
patent: 3711830 (1973-01-01), Van der sel
patent: 4088982 (1978-05-01), Haas

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