<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   YEAR
<FISCAL-YEAR-END>                          OCT-31-1997             OCT-31-1997             OCT-31-1997             OCT-31-1997
<PERIOD-START>                             NOV-01-1996             NOV-01-1996             NOV-01-1996             NOV-01-1996
<PERIOD-END>                               JAN-31-1997             APR-30-1997             JUL-31-1997             OCT-31-1997
<CASH>                                         893,000                 873,400               1,887,000               1,595,900
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                  551,100                 574,800                 472,200                 438,500
<ALLOWANCES>                                   (2,100)                 (4,500)                 (4,500)                 (8,500)
<INVENTORY>                                    157,400                 275,300                 380,300                 378,500
<CURRENT-ASSETS>                             1,654,700               1,790,900               2,836,500               2,571,000
<PP&E>                                         469,800                 541,500                 605,900                 635,100
<DEPRECIATION>                               (250,900)               (263,100)               (276,000)               (289,000)
<TOTAL-ASSETS>                               1,917,300               2,113,900               3,221,000               3,673,100
<CURRENT-LIABILITIES>                          267,400                 362,800                 360,400                 444,800
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        30,300                  30,300                  33,200                  34,500
<OTHER-SE>                                   2,154,600               2,154,600               2,827,500               3,193,800
<TOTAL-LIABILITY-AND-EQUITY>                 1,917,300               2,113,900               3,221,100               3,673,100
<SALES>                                        838,900               1,769,100               2,589,500               3,381,400
<TOTAL-REVENUES>                               838,900               1,784,900               2,621,500               3,431,400
<CGS>                                          438,500                 918,000               1,367,100               1,844,200
<TOTAL-COSTS>                                  288,800                 555,000                 851,300               1,094,600
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                     300                     800                   1,100
<INCOME-PRETAX>                                109,700                 296,900                 374,700                 420,800
<INCOME-TAX>                                    32,300                 117,900                 154,500                 144,600
<INCOME-CONTINUING>                             77,400                 179,000                 220,200                 276,200
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                    77,400                 179,000                 220,200                 276,200
<EPS-PRIMARY>                                      .03                     .04                     .05                     .06
<EPS-DILUTED>                                      .02                     .04                     .04                     .05
        

</TABLE>