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The following words are reserved by the Casio JIS Standard BASIC interpreter. They cannot be used as variable names. Reserved words are stored internally as single-byte tokens, which saves memory compared to storing the full text.
Words marked with a model badge are only reserved on those specific models. On other models, they may be usable as variable names (though this is not recommended for portability).
Note: Some reserved words (such as ALL, APPEND, AS, CALC, CSR, DEF, ELSE, ERROR, FOR, HYP, KEY, LINE, MID, NEXT, ON, OUT, PUT, RND, STEP, THEN, TO, USING, VAC, VAR) are either sub-keywords used as part of compound statements or internal tokens that are not standalone commands. They are still reserved and cannot be used as variable names.
Note: Variable names in Casio JIS BASIC are limited to a single letter (A-Z) optionally followed by a single digit (0-9) or dollar sign ($) for strings. While the reserved word restriction is less likely to cause naming conflicts with such short names, embedded reserved words within expressions can cause parsing errors. For example, TO inside a variable reference like TOTAL would be parsed as the TO keyword.
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