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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-19 and was most recently seen on 2026-05-19.
In computing, a signed overpunch is a coding scheme which stores the sign of a number by changing (usually) the last digit. It is used in character data on IBM mainframes by languages such as COBOL, PL/I, and RPG. Its purpose is to save a character that would otherwise be used by the sign digit. The code is derived from the Hollerith Punched Card Code, where both a digit and a sign can be entered in the same card column. It is called an overpunch because the digit in that column has a 12-punch or an 11-punch above it to indicate the sign. The top three rows of the card are called zone punches, and so numeric character data which may contain overpunches is called zoned decimal.
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