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EXHIBIT 99.1
JOINT FILING AGREEMENT
Each of the undersigned parties hereby agrees that the Schedule 13D to which
this Joint Filing Agreement is an Exhibit is filed by such parties jointly on
behalf of each of them pursuant to Rule 13d-1(f)(1) promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934, as
amended.
January 2, 1998 TEXAS INSTRUMENTS INCORPORATED
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Date
By: /s/ Xxxxxxx X. Xxxxxxxxx
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Xxxxxxx X. Xxxxxxxxx,
Executive Vice President
January 2, 1998 DSL ACQUISITION CORPORATION
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Date
By: /s/ Xxxxxx Xxxxxx
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Xxxxxx Xxxxxx, President
