If you can’t beat them, join them: Waltham, Massachusetts-based Cambex Corp is a gadfly stinging IBM Corp with its Certainty Series plug-compatible RS/6000 disk arrays and drives, tape drives and add-on memory: in the past, IBM would go way out of its way to try to crush such interlopers, but in its new, realistic mood of resignation, it is taking the wiser course of agreeing to provide field service and support for Cambex Certainty Series.