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In page Ampersand:

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The ampersand was occasionally used as a prefix to denote a hexadecimal number, such as &FF for decimal 255, for instance in BBC BASIC.[citation needed] (The modern convention is to use "x" as a prefix to denote hexadecimal, thus xFF.) Some other languages, such as the Monitor built into ROM on the Commodore 128, used it to indicate octal instead, a convention that spread throughout the Commodore community and is now used in the VICE emulator.[8]