BOSTON DIGITAL CORP <BOST.O> 4TH QTR NET Period ended April 30 Shr profit nil vs loss eight cts Net profit 4,000 vs loss 213,000 Sales 3,668,000 vs 2,602,000 Year Shr loss 18 cts vs loss 23 cts Net loss 482,000 vs loss 614,000 Sales 12.5 mln vs 13.6 mln NOTE: 1987 earnings in each period include a provision for unrealized loss on marketable securities of 176,000 dlrs