Monthly Sales Report - April 1999

Hsin-Chu, Taiwan, May 7, 1999 - Taiwan Semiconductor Manufacturing Company Ltd. (TAIEX: 2330, NYSE: TSM), ("TSMC" or "the Company" ) today announced that its net sales for April 1999 were NT$5,238 million; revenues from January to April 1999 were NT$17,739 million.

Mr. YC Huang, TSMC Spokesman, pointed out that as a result of continuos pick-up in demand, in April 1999 the Company's capacity was fully utilized, and sales units of 8-inch equivalent wafers set a new record high at 128.5 thousand wafers. Net sales for April 1999 registered a 6.1% increase in comparison with NT$4,939 million for March 1999 and a 15.8% increase over the same period a year ago. The sales number of NT$5,238 million for April 1999 is approaching the historical monthly-record-high achieved in 1998.