<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-START>                              OCT-1-1996
<PERIOD-END>                               DEC-31-1996
<EXCHANGE-RATE>                                      1
<CASH>                                             763
<SECURITIES>                                    16,374
<RECEIVABLES>                                    4,281
<ALLOWANCES>                                         0
<INVENTORY>                                      2,668
<CURRENT-ASSETS>                                 8,492
<PP&E>                                          11,181
<DEPRECIATION>                                   7,709
<TOTAL-ASSETS>                                  28,713
<CURRENT-LIABILITIES>                            5,982
<BONDS>                                          3,074
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           105
<OTHER-SE>                                      19,553
<TOTAL-LIABILITY-AND-EQUITY>                    28,713
<SALES>                                            415
<TOTAL-REVENUES>                                 2,692
<CGS>                                              590
<TOTAL-COSTS>                                    2,831
<OTHER-EXPENSES>                                 2,747
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 102
<INCOME-PRETAX>                                (3,367)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (3,367)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (3,367)
<EPS-PRIMARY>                                   (0.32)
<EPS-DILUTED>                                   (0.32)