National Gypsum said it postponed its special...

National Gypsum said it postponed its special stockholders meeting, scheduled for Friday, to next Tuesday . . . Microcomputer Memories, a Chatsworth disk-drive maker, reported that it has filed for protection from creditors under Chapter 11 of the U.S. Bankruptcy Code . . . Baytree Investors withdrew its third takeover bid for Carson Pirie Scott & Co. after the department store chain’s board of directors turned down the bid.