DBASE IV 1.1 for DOS, 5.25' $195. Yes, shrinkwrap in near collectible condition. DBASE IV 1.1 for DOS, 3.5' and 5.25'-No. DBASE IV 1.1 for DOS, Campus Program, Borland label, 3.5' $125. Yes, like new in retail box with unused reg. DBASE IV 1.1 for DOS, Ashton-Tate label. DBase (also stylized dBASE) was one of the first database management systems for microcomputers, and the most successful in its day. The dBase system includes the core database engine, a query system, a forms engine, and a programming language that ties all of these components together. DBase's underlying file format, the.dbf file, is widely used in applications needing a simple format to.