FOLD

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YES
instructs the assembler to translate lowercase alphabetic characters (a through z) in the assembler listing to uppercase alphabetic characters (A through Z). All lowercase alphabetic characters are translated, including lowercase characters in source statements, assembler error diagnostic messages, and assembler listing lines provided by a user exit. Lowercase alphabetic characters are translated to uppercase alphabetic characters, regardless of the setting of the COMPAT(CASE) option.
NO
lowercase alphabetic characters are not translated to uppercase alphabetic characters.
Default
FOLD=NO