Monthly Sales Report - August 1999

Hsin-Chu, Taiwan, September 9, 1999 - Taiwan Semiconductor Manufacturing Company Ltd. ("TSMC" or "the Company" ) (TAIEX: 2330, NYSE: TSM) today announced that its net sales for August 1999 reached a new high of NT$7,012 million. TSMC sales results have set new records for the past four consecutive months.

Mr. YC Huang, TSMC Spokesman, pointed out that due to continued growth in the IC market, the Company's manufacturing capacity was once again fully utilized in August 1999. Sales for August 1999 registered a 6.5% increase over July 1999 and a very substantial increase of 84.5% on a year-over-year basis. The Company's sales revenues from January through August 1999 totaled NT$43,331million, representing a 26.8% increase over the corresponding period in 1998.