<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET ON FORM 10Q FOR THE PERIOD ENDED AUGUST 31, 1999 AND
THE CONSOLIDATED STATEMENT OF OPERATIONS AS FILED ON FORM 10Q FOR THE THREE AND
NINE MONTHS ENDED AUGUST 31, 1999.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          NOV-30-1999             NOV-30-1999
<PERIOD-START>                             JUN-01-1999             DEC-01-1998
<PERIOD-END>                               AUG-31-1999             AUG-31-1999
<CASH>                                           7,643                   7,643
<SECURITIES>                                    19,512                  19,512
<RECEIVABLES>                                    6,143                   6,143
<ALLOWANCES>                                       378                     378
<INVENTORY>                                      1,532                   1,532
<CURRENT-ASSETS>                                35,706                  35,706
<PP&E>                                          14,890                  14,890
<DEPRECIATION>                                   7,806                   7,806
<TOTAL-ASSETS>                                  44,755                  44,755
<CURRENT-LIABILITIES>                           15,358                  15,358
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            85                      85
<OTHER-SE>                                      29,312                  29,312
<TOTAL-LIABILITY-AND-EQUITY>                    44,755                  44,755
<SALES>                                         13,116                  37,792
<TOTAL-REVENUES>                                13,116                  37,792
<CGS>                                            5,014                  14,641
<TOTAL-COSTS>                                    5,014                  14,641
<OTHER-EXPENSES>                                 8,588                  24,880
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                  (172)                   (684)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                              (172)                   (684)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     (172)                   (684)
<EPS-BASIC>                                      (.02)                   (.08)
<EPS-DILUTED>                                    (.02)                   (.08)


</TABLE>