 These ran the company's proprietary MPX-32 operating system.With the additional of virtual memory hardware, the 32/67 and 32/97 models took on the designations of Powernode 6000 and Powernode 9000, with several variants of each available.These ran UTX-32, Gould's version of Unix based on a BSD 4.2 kernel developed by Purdue University to support multiprocessor systems.