Tokyo stocks rose slightly Tuesday morning as gains on Wall Street overnight spurred buying of battered tech stocks, while a wait-and-see mood before earnings season starting this week limited risk appetite. The 225-issue Nikkei Stock Average gained 77.34 points, or 0.20 percent, from Monday to 39,676.34. The broader Topix index was up 12.99 points, or 0.46 percent, at 2,840.52. The U.S. dollar weakened briefly to the mid-156 yen range in Tokyo amid growing expectations that the Bank of Japan will decide to raise its benchmark interest rate at its policy meeting next week. At noon, the dollar …