Mitsubishi Electric Corp has unveiled three new IBM 4381-class mainframe models and a new release of the operating system: successors to the original EXs, the Melcom EX860 has twice the performance of the old 840, and the EX870 and EX880 three and five times the performance of the 840 respectively; the new release of GOS/VS adds features for networking and distributed processing, and the mach-ines, which are not IBM-compatible because Mitsubishi was stung badly by the 1983 NipSting case, are nevertheless designed to act as satellite processors to large IBM mainframes, and include SNA communication and file exchange with IBM mainframes; built in 2,500 gate ECL switching at 400 picoseconds and ECL caches with 5nS access time, they come with 16Mb to 64Mb memory, and the smaller two have up to 16 channels, the 880 24 channels; they are initially aimed at companies within the Mitsubishi group, which are big IBM users, and the target is 150 systems of the new models over the next three years, taking the EX base to between 400 and 500.