<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF OPERATIONS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> MAR-31-1998 <CASH> 3,290 <SECURITIES> 36,319 <RECEIVABLES> 33,184 <ALLOWANCES> 0 <INVENTORY> 5,972 <CURRENT-ASSETS> 85,816 <PP&E> 24,747 <DEPRECIATION> 17,335 <TOTAL-ASSETS> 103,992 <CURRENT-LIABILITIES> 9,376 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 482 <OTHER-SE> 90,157 <TOTAL-LIABILITY-AND-EQUITY> 103,992 <SALES> 15,736 <TOTAL-REVENUES> 17,440 <CGS> 2,518 <TOTAL-COSTS> 12,599 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 21 <INCOME-PRETAX> 4,820 <INCOME-TAX> 1,455 <INCOME-CONTINUING> 3,365 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 3,365 <EPS-PRIMARY> 0.07 <EPS-DILUTED> 0.07