The SYSIN data set is the main input into Assembler H and VS COBOL II. It contains the ISPF libraries or other partitioned or sequential data sets that you enter on the Foreground Assembler H and VS COBOL II Compile panels. This data set is used to find the member that contains the program to be assembled or compiled. For a PDS, the ALLOC command would be:

ALLOC FI(SYSIN) DA('proj.lib.type(mem)')

For a sequential data set, the ALLOC command would be:

ALLOC FI(SYSIN) DA('proj.lib.type')