<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997             SEP-30-1997
<PERIOD-START>                             JAN-01-1997             OCT-01-1996
<PERIOD-END>                               MAR-31-1997             MAR-31-1997
<CASH>                                         112,232                 112,232
<SECURITIES>                                    65,371                  65,371
<RECEIVABLES>                                   19,539                  19,539
<ALLOWANCES>                                       900                     900
<INVENTORY>                                     10,234                  10,234
<CURRENT-ASSETS>                               211,686                 211,686
<PP&E>                                          47,692                  47,692
<DEPRECIATION>                                  24,235                  24,235
<TOTAL-ASSETS>                                 242,190                 242,190
<CURRENT-LIABILITIES>                           15,213                  15,213
<BONDS>                                            226                     226
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       258,280                 258,280
<OTHER-SE>                                    (31,529)                (31,529)
<TOTAL-LIABILITY-AND-EQUITY>                   242,190                 242,190
<SALES>                                         24,562                  46,394
<TOTAL-REVENUES>                                24,562                  46,394
<CGS>                                           10,833                  20,691
<TOTAL-COSTS>                                   18,020                  34,290
<OTHER-EXPENSES>                                    83                      76
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  36                     134
<INCOME-PRETAX>                                  8,645                  15,315
<INCOME-TAX>                                       863                   1,530
<INCOME-CONTINUING>                              7,782                  13,785
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     7,782                  13,785
<EPS-PRIMARY>                                     0.20                    0.37
<EPS-DILUTED>                                     0.20                    0.37