MAI Basic Four Inc., a Tustin computer...

MAI Basic Four Inc., a Tustin computer maker, has extended its $970-million hostile tender offer to buy Prime Computer Inc. from its shareholders. MAI also said that, as of Wednesday night, 62.7% of the stock of Natick, Mass.-based Prime has been tendered under its $20-a-share offer. That figure includes about 3.4% of Prime’s stock already owned by a company controlled by New York investor Bennett S. LeBow, MAI’s chairman. The tender offer was extended to March 17.