<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET ON FORM 10-Q FOR THE PERIOD ENDED MAY 31, 2000 AND
THE CONSOLIDATED STATEMENTS OF OPERATIONS AS FILED ON FORM 10-Q FOR THE THREE
AND SIX MONTHS ENDED MAY 31, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS
<FISCAL-YEAR-END> NOV-30-2000 NOV-30-2000
<PERIOD-START> MAR-01-2000 DEC-01-1999
<PERIOD-END> MAY-31-2000 MAY-31-2000
<CASH> 9,321 9,321
<SECURITIES> 16,329 16,329
<RECEIVABLES> 12,942 12,942
<ALLOWANCES> 4,151 4,151
<INVENTORY> 4,932 4,932
<CURRENT-ASSETS> 40,985 40,985
<PP&E> 22,804 22,804
<DEPRECIATION> 15,856 15,856
<TOTAL-ASSETS> 55,692 55,692
<CURRENT-LIABILITIES> 23,077 23,077
<BONDS> 0 0
0 0
0 0
<COMMON> 121 121
<OTHER-SE> 32,494 32,494
<TOTAL-LIABILITY-AND-EQUITY> 55,692 55,692
<SALES> 20,577 38,497
<TOTAL-REVENUES> 20,577 38,497
<CGS> 8,358 15,894
<TOTAL-COSTS> 8,358 15,894
<OTHER-EXPENSES> 14,458 26,528
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 0 0
<INCOME-PRETAX> (2,116) (3,505)
<INCOME-TAX> 0 30
<INCOME-CONTINUING> (2,116) (3,535)
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> (2,116) (2,116)
<EPS-BASIC> (0.18) (0.30)
<EPS-DILUTED> (0.18) (0.30)
</TABLE>