BANK OF JAPAN STEPS UP DOLLAR BUYING The Bank of Japan stepped up its dollar buying as it re-entered the market after the midday Tokyo lunch break, dealers said. They said the bank seemed more determined to support the dollar than it did this morning. Several dealers said the central bank intervened this afternoon when the dollar stood around 149 yen. One said it purchased 150 to 200 mln dlrs in the half-hour since the market re-opened after its lunchtime closure. Another said the bank still has buying orders in the market.