Define the data sets that contain your source code with the SYSIN DD statement:
//SYSIN DD DSN=datasetname,DISP=SHR
This data set contains the input to the assembler; that is, the assembler language source statements to be processed.
You can place your assembler source code in the input stream. To do this, use this SYSIN DD statement:
//SYSIN DD *
When you use the (*) DD parameter, the source code must follow the DD statement. If another job step follows the assembly, the EXEC statement for that step must follow the last source statement, or end-of-file (/*) statement.
The IBM-supplied High Level Assembler procedures do not contain the SYSIN DD statement. The DD statement for SYSIN must be provided in the input stream:
//STEP1 EXEC ASMAC //SYSIN DD *
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assembler source statements
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/*
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