SYSPARMV

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Read syntax diagramSkip visual syntax diagramSYSPARMV=string
string
the character string used as the default value of the &SYSPARM system variable symbol. The character string is up to 255 characters in length. Any character can be included in the string, subject to the rules for building character strings defined in HLASM Language Reference. If the string includes blanks, commas, or parentheses, it must be enclosed in apostrophes.
Default
SYSPARMV not specified.
Note: This option can be specified as an assembler invocation parameter by specifying the SYSPARM(string) option.

On z/VSE®, if a SYSPARM value is provided in the default options, it is not possible to override it with a null string in the // OPTION statement. It is possible to override it only with a non-null value. unless you use the invocation parm string to do it.