<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

                                                  
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          APR-30-1999             APR-30-1998
<PERIOD-START>                             MAY-01-1998             MAY-01-1997
<PERIOD-END>                               APR-30-1999             APR-30-1998
<CASH>                                          13,115                  12,590
<SECURITIES>                                    11,066                  16,012
<RECEIVABLES>                                   13,945                  11,069
<ALLOWANCES>                                       973                     307
<INVENTORY>                                      9,716                   6,224
<CURRENT-ASSETS>                                58,963                  58,457
<PP&E>                                          41,964                  37,571
<DEPRECIATION>                                  24,260                  18,845
<TOTAL-ASSETS>                                  89,228                  90,341
<CURRENT-LIABILITIES>                           12,962                   9,294
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        54,333                  51,677
<OTHER-SE>                                      20,855                  27,107
<TOTAL-LIABILITY-AND-EQUITY>                    89,228                  90,341
<SALES>                                         65,027                  64,343
<TOTAL-REVENUES>                                65,027                  64,343
<CGS>                                           38,806                  36,480
<TOTAL-COSTS>                                   38,806                  36,480
<OTHER-EXPENSES>                                10,314<F1>               7,617<F1>
<LOSS-PROVISION>                                   187<F2>                  61<F2>
<INTEREST-EXPENSE>                                 (2)                     (3)
<INCOME-PRETAX>                                  1,716                   8,760
<INCOME-TAX>                                     (319)                   2,298
<INCOME-CONTINUING>                              2,035                   6,462
<DISCONTINUED>                                 (8,063)                 (3,725)
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (6,028)                 (2,737)
<EPS-BASIC>                                      (.51)                     .24
<EPS-DILUTED>                                    (.48)                     .22
<FN>
<F1>Research & Development
<F2>Provision for Bad Debt
</FN>