Corollary Inc and The Santa Cruz Operation Inc have signed a technology agreement which Corollary hopes guarantees its customers ongoing compatibility with what it considers the industry-standard version of Xenix from Santa Cruz. Corollary, of Irvine, California centres its product family around its ATtain system. The ATtain system is based on an IBM AT or compatible, which, from IBM at least, normally supports no more than four users, but Corollary claims that an ATtain system can support up to 32 users by adding 80286 processors. Corollary’s ATtain subsystem package consists of a single-slot 80286 processor with 1Mb memory, ATtain extensions to the Xenix kernel, and an optional terminal concentrator unit designed to support eight terminals. Up to four ATtain subsystems can be installed in a AT-alike to build a 32-user system. The first release of the ATtain kernel was based on source obtained under licence from Microsoft but Corollary says that it quickly discovered the market leader was actually SCO Xenix. With versions of ATtain based on the Santa Cruz version, the company hopes to be in a better position to satisfy OEM customers and resellers. One of the critical conditions of the agreement is that SCO will provide Corollary with new releases early, according to Corollary. The Santa Cruz Operation hopes to broaden its market with the agreement because, it says, the ATtain system provides supermini performance, increasing the scope of Xenix. Santa Cruz and Corollary will also share stands and trade shows to promote the product. The ATtain 286 processor board with 1Mb of memory is $1,950 in single quantities, the extended kernel is $250, and the optional ATtain terminal concentrators costs $750 apiece.