Cullinet Software Inc made its formal entry into the Unix market yesterday, and revealed a big contract with AT&T Co. Its Unix offering is Enterprise:DB for Unix, a production relational database system with full support for ANSI SQL, based on the former IDMS/SQL for DEC’s VMS. Features include determination of the optimal access path to data at compile time, rather than execution time, and the initial release runs on Sun Microsystems Sun-3 and Sun-4 workstations and on the IBM RT. It supports C and Fortran and is set for first quarter 1989 delivery at from $4,800 to $91,800, depending on configuration. The AT&T pact no value – is for software from the Cullinet Enterprise Computing family to enable AT&T software developers to create applications for multiple environments – Unix, PC-DOS, MVS – without the developers needing to learn more than one environment.