Japanese trading giant Mitsui & Co Ltd is cementing its relationship with William Poduska’s Newton, Massachusetts-based Stellar Computer Corp by investing $1m in the emerging company. In April it signed to market Stellar’s GS1000 graphics supercomputer in Japan and is doing joint sofware development for it with the Mitsui Zosen Systems Research Inc unit of Mitsui Engineering and Shipbuilding Co. Asahi Chemical Industry Co is also marketing the Stellar GS1000 in Japan.