<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, 1999 and
the consolidated statement of operations as filed on Form 10-Q for the three
and six months ended May 31, 1999 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-30-1999             NOV-30-1999
<PERIOD-START>                             MAR-01-1999             DEC-01-1998
<PERIOD-END>                               MAY-31-1999             MAY-31-1999
<CASH>                                           6,760                   6,760
<SECURITIES>                                    21,165                  21,165
<RECEIVABLES>                                    6,199                   6,199
<ALLOWANCES>                                       374                     374
<INVENTORY>                                      1,726                   1,726
<CURRENT-ASSETS>                                36,621                  36,621
<PP&E>                                          14,520                  14,520
<DEPRECIATION>                                   6,814                   6,814
<TOTAL-ASSETS>                                  44,610                  44,610
<CURRENT-LIABILITIES>                           15,220                  15,220
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            84                      84
<OTHER-SE>                                      29,306                  29,306
<TOTAL-LIABILITY-AND-EQUITY>                    29,390                  29,390
<SALES>                                         12,537                  24,676
<TOTAL-REVENUES>                                12,537                  24,676
<CGS>                                            4,863                   9,627
<TOTAL-COSTS>                                    4,863                   9,627
<OTHER-EXPENSES>                                 7,836                  16,292
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                    177                   (512)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                                177                   (512)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       177                   (512)
<EPS-BASIC>                                        .02                   (.06)
<EPS-DILUTED>                                      .02                   (.06)


</TABLE>