<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
CONSOLIDATED FINANCIAL STATEMENTS FOR THE PERIODS INDICATED BELOW AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1997             SEP-30-1997             SEP-30-1997             SEP-30-1997
<PERIOD-END>                               DEC-31-1996             MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          19,768                  20,643                  21,473                   7,065
<SECURITIES>                                         0                       0                       0                  12,728
<RECEIVABLES>                                    3,899                   4,656                   4,200                   4,685
<ALLOWANCES>                                       300                     300                     300                     300
<INVENTORY>                                      1,914                   1,846                   1,618                   1,745
<CURRENT-ASSETS>                                25,796                  27,485                  27,603                  26,536
<PP&E>                                           2,046                   2,247                   2,410                   2,795
<DEPRECIATION>                                     598                     681                     772                     871
<TOTAL-ASSETS>                                  40,467                  42,016                  41,961                  40,907
<CURRENT-LIABILITIES>                            2,766                   2,327                   2,604                   3,018
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                            70                      71                      71                      72
<OTHER-SE>                                      37,631                  39,618                  39,286                  37,817
<TOTAL-LIABILITY-AND-EQUITY>                    40,467                  42,016                  41,961                  40,907
<SALES>                                          6,544                  14,287                  22,356                  30,283
<TOTAL-REVENUES>                                 6,544                  14,287                  22,356                  30,283
<CGS>                                            2,220                   4,982                   7,860                  10,818
<TOTAL-COSTS>                                    1,732                   3,811                   6,010                   8,321
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                                  2,828                   5,989                   9,265                  12,216
<INCOME-TAX>                                     1,089                   2,306                   3,567                   4,703
<INCOME-CONTINUING>                              1,739                   3,683                   5,698                   7,513
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     1,739                   3,683                   5,698                   7,513
<EPS-PRIMARY>                                     0.25<F1>                0.52<F1>                0.81<F1>                1.07<F1>
<EPS-DILUTED>                                     0.24                    0.51                    0.79                    1.05
<FN>
<F1>The value shown for the caption "EPS Primary" is Basic EPS computed in
accordance with FAS128.
</FN>
        

</TABLE>