<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-START>                             JUL-01-1996
<PERIOD-END>                               SEP-30-1996
<EXCHANGE-RATE>                                      1
<CASH>                                           2,440
<SECURITIES>                                    17,918
<RECEIVABLES>                                    3,629
<ALLOWANCES>                                         0
<INVENTORY>                                      2,038
<CURRENT-ASSETS>                                 8,392
<PP&E>                                          10,906
<DEPRECIATION>                                   7,291
<TOTAL-ASSETS>                                  30,367
<CURRENT-LIABILITIES>                            3,735
<BONDS>                                          3,251
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           105
<OTHER-SE>                                      23,269
<TOTAL-LIABILITY-AND-EQUITY>                    30,367
<SALES>                                            560
<TOTAL-REVENUES>                                 2,432
<CGS>                                              613
<TOTAL-COSTS>                                    2,153
<OTHER-EXPENSES>                                 3,178
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  86
<INCOME-PRETAX>                                (2,674)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (2,674)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (2,674)
<EPS-PRIMARY>                                   (0.25)
<EPS-DILUTED>                                   (0.25)