Hi Mike,
I believe most of the files are already present in the distribution by George Shedlock - mostly as macros and source books. I think you will be able to find the code for the DOS supervisor, most of Power and the assembler. However I don't think you will find the code for VTAM, Cobol, PL/I and Fortran.
Are you looking for something specific?
Regards,
Steen
