<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          19,189
<SECURITIES>                                    24,163<F1>
<RECEIVABLES>                                    3,855
<ALLOWANCES>                                     1,014
<INVENTORY>                                      2,535
<CURRENT-ASSETS>                                48,769
<PP&E>                                          20,531
<DEPRECIATION>                                  14,829
<TOTAL-ASSETS>                                  58,172
<CURRENT-LIABILITIES>                           14,879
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       118,598
<OTHER-SE>                                    (86,741)
<TOTAL-LIABILITY-AND-EQUITY>                    58,172
<SALES>                                          1,700
<TOTAL-REVENUES>                                17,533
<CGS>                                              918
<TOTAL-COSTS>                                    4,009
<OTHER-EXPENSES>                                14,834
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 580
<INCOME-PRETAX>                                  (563)
<INCOME-TAX>                                       110
<INCOME-CONTINUING>                              (673)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (673)
<EPS-PRIMARY>                                    (.04)
<EPS-DILUTED>                                    (.04)
<FN>
<F1>THIS AMOUNT REPRESENTS SHORT-TERM INVESTMENTS HELD
BY THE COMPANY AT 6-30-97.
</FN>