Hitachi Ltd has clarified its strategy in the US market, saying that it has no plans to build its own mainframe plant there, and that it will continue its OEM agreement with National Semiconductor (which of course doesn’t preclude it establishing other US marketing outlets as well): it also says that sales of its 2020 and 2050 workstations in the US are under consideration; the negotiations with Unisys Corp for joint computer development are proceeding, suggesting that, as expected, the link between Hitachi and the Sperry mainframe arm will strengthen; it also starts disk drive manufacture in Oklahoma in April.