OS/360 Object File Format
From Just Solve the File Format Problem
OS/360 Object File Format is the original executable format for IBM mainframe operating system OS/360 and its successors. It is still supported by contemporary z/OS, although officially superseded by GOFF. It is also supported on z/VM (previously VM/CMS), although likewise superseded by GOFF there as well.
It was also used by some other mainframe vendors which partially copied IBM's technologies, such as UNIVAC Series 90.
