TREND WATCH

A roundup of business developments spotted by other publications. Trade Test: Toys R Us, with almost 500 stores on three continents, has jumped at the chance to test Japan’s promise to open its domestic market to foreign retailers. As Washington and other U.S. retailers watch, the giant toy purveyor will try to open at least five stores in Japan by the end of 1991 and 95 more in the long run. Although the Japanese Ministry of Trade has pledged assistance, powerful opposition is expected from local businesses and politicians. But Toys R Us is determined to grab a piece of the $4.8-billion Japanese toy market. Boston Globe

Un-Pampered: Procter & Gamble and other makers of disposable diapers are girding against proposals to ban or tax the products, which take up 1% to 2% of landfill volume. While manufacturers dispute the figure’s significance, some states are taking action. Nebraska has banned the sale of disposables after Oct. 1, 1993. Cincinnati Enquirer

Super Competition: Although the next two years should be good for supercomputer giant Cray Research as it phases out older models in favor of machines that will extend the high- and low-end prices of its products, more competition is ahead. At least two big rivals--Cray Computer, an independent spinoff based in Colorado Springs, Colo., and Supercomputer Systems in Wisconsin--will be joined by five smaller companies as newcomers in the market before 1994. Expect all players to bring out faster, more powerful computers at prices only slightly higher than today’s. Minneapolis Star Tribune

Reachable: IDB Communications Group Inc. of Los Angeles and Washington-based Comsat Corp. have developed satellite technology that will allow incoming telephone calls to reach passengers on transoceanic flights. The service would be available only on international routes, due to U.S. regulations. In the future, business and first-class seats may be equipped with telephones, fax machines and PC hookups. Palm Beach Post