The output from the assembler can consist of an object module, a program listing, terminal messages, and an associated data file. The object module can be written to a data set residing on a direct-access device or a magnetic tape. If you specify the GOFF assembler option, the assembler produces a generalized object format module. Both formats of the object module are written to the same data set, however only one format can be produced at a time. From that data set, the object module can be read and processed by the linkage editor, the batch loader, or the z/OS binder. See Object deck output for the format of the object module. The format of the generalized object format module is described in z/OS MVS Program Management: Advanced Facilities.

The program listing shows all the statements in the module, both in source and machine language format, and gives other important information about the assembly, such as error messages and cross reference information. The listing is described in detail in Using the assembler listing.