This is a set of "Prospero Fortran (Fortran-77)" for MS-DOS, which was developed for professionals from the late 1980s to the 1990s. ■ Contents User Manual: November 1989 edition Manual: In binder format. While there is some yellowing on the page edges due to age, there are no writings or major tears, and the condition is good. Disks: There are no visible signs of mold or major scratches, but we cannot guarantee actual operation as we do not have an environment to verify functionality. Please consider this as a collectible or for reference. Outer box/case: There are some scratches and stains due to aging, but the shape is well-maintained.