<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