Eastern Michigan University developed a Fortran IV compiler for the 1130, known as Fortran-EMU, as an alternative to the Fortran IV (subset) compiler provided by IBM. It adds many features, including the LOGICAL data type, enhanced diagnostics, and six-letter variable names. The Fortran-EMU compiler was distributed as a deck of punched cards in a disk image file format with all the remaining system area deleted, to prevent copying other modules that would normally reside on the same disk, such as the assembler or compilers.