<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          SEP-30-1997             SEP-30-1997
<PERIOD-START>                             APR-01-1997             OCT-01-1996
<PERIOD-END>                               JUN-30-1997             JUN-30-1997
<CASH>                                         127,801                 127,801
<SECURITIES>                                    47,777                  47,777
<RECEIVABLES>                                   20,467                  20,467
<ALLOWANCES>                                       900                     900
<INVENTORY>                                     10,987                  10,987
<CURRENT-ASSETS>                               211,218                 211,218
<PP&E>                                          56,245                  56,245
<DEPRECIATION>                                  25,781                  25,781
<TOTAL-ASSETS>                                 259,109                 259,109
<CURRENT-LIABILITIES>                           21,466                  21,466
<BONDS>                                            184                     184
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       260,033                 260,033
<OTHER-SE>                                    (22,574)                (22,574)
<TOTAL-LIABILITY-AND-EQUITY>                   259,109                 259,109
<SALES>                                         27,607                  74,001
<TOTAL-REVENUES>                                27,607                  74,001
<CGS>                                           11,875                  32,566
<TOTAL-COSTS>                                   19,986                  54,276
<OTHER-EXPENSES>                                    10                      86
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  19                     153
<INCOME-PRETAX>                                  9,950                  25,265
<INCOME-TAX>                                       995                   2,525
<INCOME-CONTINUING>                              8,955                  22,740
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     8,955                  22,740
<EPS-PRIMARY>                                     0.23                    0.60
<EPS-DILUTED>                                     0.23                    0.60