NEW YORK -- Ashton-Tate Corp. last week unveiled a new generation of its bestselling dBase data base-management software designed for personal computers that run either the Disk Operating System (DOS) or the newer Operating System/2.

The Torrance, Calif.-based software concern said its new dBase IV incorporates a new user interface, called Control Center, that enables users to perform tasks, such as data entry, query and report generation, by selecting files from a menu rather than by writing programs.

For more advanced users, template language is provided for analysis and modification of all features of the software. The new generation also preserves more sophisticated command interfaces from earlier versions.

Ashton-Tate also announced the dBase IV Developer's Edition, which it called the complete dBase IV programming environment designed for use by applications developers and consultants.

The company said dBase IV will carry a suggested retail price of $795, while Developer's Edition will be $1,295.

Both products, which are expected to be available by July 31, will be sold through Ashton-Tate authorized retailers and its own sales organization.

Earlier versions of dBase can be fully upgraded without modification for $175, but the company said customers who buy dBase III before July 31 will be offered the option of upgrading for $30.