Hitachi Ltd this week added two low-end models to its low-cost S series of scientific supercomputers – and is offering Unix System V as an option on them. The new models are the S-820/40, rated at 750MFLOPS and renting for the equivalent of $373,000 a month, and the S-820/20, 375MFLOPS, going for $278,000 a month. Available from today in Japan, the new models, like their predecessors derived from Hitachi’s IBM-compatible mainframes, run Unix System V as well as proprietary VOS3/HAP/ES vector processing operating system. Hitachi hopes to do 70 of the things over five years.