<ARTICLE> 5 <RESTATED> <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 5,699 <SECURITIES> 36,959 <RECEIVABLES> 25,865 <ALLOWANCES> (1,076) <INVENTORY> 439 <CURRENT-ASSETS> 76,809 <PP&E> 14,485 <DEPRECIATION> (7,002) <TOTAL-ASSETS> 108,848 <CURRENT-LIABILITIES> 14,882 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 24 <OTHER-SE> 93,365 <TOTAL-LIABILITY-AND-EQUITY> 108,848 <SALES> 51,665 <TOTAL-REVENUES> 51,665 <CGS> 16,169 <TOTAL-COSTS> 16,169 <OTHER-EXPENSES> 24,374 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 47 <INCOME-PRETAX> 12,032 <INCOME-TAX> 2,861 <INCOME-CONTINUING> 9,171 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 9,171 <EPS-PRIMARY> 0.38 <EPS-DILUTED> 0.36