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⟩ How are data passed from JCL parm to assembler program. And how is data passed from a calling program to an assembler called program?

By convention, general purpose register 1 will have the

address of the parameter list. The list will be a list of

pointers (addresses) to individual parameters. The CALL

macro does this, but you can bypass the CALL macro and be

creative on how you set up the parameter list. Don't forget

the parameter must be on a fullword boundary.

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