Hsinchu, Taiwan, October 27, 2004 -ChipMOS TECHNOLOGIES (Bermuda) LTD. ("ChipMOS" or "the Company") (Nasdaq: IMOS) today announced its intention to offer approximately US$50 million (or US$62.5 million including the bookrunner's option to increase) in convertible senior notes due 2009, subject to entering into a purchase agreement with the initial purchasers and subject to market and other conditions. The notes will be convertible into common shares of the Company and are expected to mature in five years, subject to exercise of the issuer's call option or holders' put option. The conversion rate, interest rate and offering price are to be determined.

The net proceeds of the offering will be used to fund capital expenditures and repay certain payables related to its operations in Mainland China and for general corporate purposes.

The notes and the common shares issuable upon conversion of the notes have not been and will not be registered under the United States Securities Act of 1933 and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall it constitute an offer, solicitation or sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful. This press release is being issued pursuant to and in accordance with Rule 135c under the Securities Act of 1933, as amended.

About ChipMOS TECHNOLOGIES (Bermuda) LTD.: ChipMOS (www.chipmos.com.tw) is a leading independent provider of semiconductor testing and assembly services to customers in Taiwan, Japan, and the U.S. With advanced facilities in Hsinchu and Southern Taiwan Science Parks in Taiwan and Shanghai, ChipMOS and its subsidiaries provide testing and assembly services to a broad range of customers, including leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries.

Forward-Looking Statements Certain statements contained in this announcement may be viewed as "forward-looking statements" within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended. Such forward-looking statements involve known and unknown risks, uncertainties and other factors, which may cause the actual performance, financial condition or results of operations of the Company to be materially different from any future performance, financial condition or results of operations implied by such forward-looking statements. Further information regarding these risks, uncertainties and other factors is included in the Company's most recent Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the "SEC") and in the Company's other filings with the SEC.