<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          APR-30-2000
<PERIOD-START>                             MAY-01-1999
<PERIOD-END>                               AUG-01-1999
<CASH>                                          24,907
<SECURITIES>                                         0
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<CURRENT-ASSETS>                                56,724
<PP&E>                                          42,649
<DEPRECIATION>                                  25,672
<TOTAL-ASSETS>                                  84,775
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<CGS>                                           11,330
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<OTHER-EXPENSES>                                 3,633<F1>
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<EPS-BASIC>                                      (.68)
<EPS-DILUTED>                                    (.68)
<FN>
<F1>Research and development
<F2>Provision for bad debt
<F3>Cummulative effect of accounting change
</FN>