ROCHESTER PORTFOLIO SERIES
497, 1998-11-05
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                     LIMITED TERM NEW YORK MUNICIPAL FUND

                  Supplement dated November 10, 1998 to the

                       Prospectus dated April 22, 1998

The Prospectus is changed as follows:

1.    The Supplement dated May 15, 1998 to the Prospectus is replaced by this
 Supplement.

2.    The  reference to "non-diversified mutual fund" on the front cover of
      the Prospectus is changed to "diversified mutual fund".

3.    Footnote  number 3 under the  table  entitled  AShareholder  Transaction
Expenses" on page 3 is modified to read as follows:

            (1) If you  invest  $1  million  or  more  in  Class A
            shares,  you may have to pay a sales  charge  of up to
            1% if you sell your shares  within 18 calendar  months
            from the end of the  calendar  month  during which you
            purchased  those  shares.  See "How to Buy  Shares  --
            Buying Class A Shares," below.

4.    The fourth sentence of "A Brief Overview of the Fund - How Risky Is The
Fund" on page 6 is hereby deleted.

5.          The paragraph entitled "Non-Diversification" set forth under
"Investment Risks" on page 16 is hereby deleted.

6.          The following  paragraph is added to the end of "Investment Risks"
   on page 17:

            "Year  2000  Risks.  Because  many  computer  software
            systems in use today cannot  distinguish the year 2000
            from the year 1900,  the  markets  for  securities  in
            which  the  Fund   invests   could  be   detrimentally
            affected by  computer  failures  beginning  January 1,
            2000.  Failure of computer systems used for securities
            trading  could  result  in  settlement  and  liquidity
            problems  for  the  Fund  and  other  investors.  That
            failure  could  have a  negative  impact  on  handling
            securities  trades,  pricing and accounting  services.
            Data  processing  errors  by  government   issuers  of
            securities  could  result in  economic  uncertainties,
            and  those  issuers  may  incur  substantial  costs in
            attempting  to  prevent  or fix  such  errors,  all of
            which  could  have a  negative  effect  on the  Fund's
            investments and returns.

            The Manager,  the  Distributor  and the Transfer Agent
            have  been  working  on  necessary  changes  to  their
            computer  systems  to deal  with  the  year  2000  and
            expect that their  systems will be adapted in time for
            that event,  although  there  cannot be  assurance  of
            success.   Additionally,  the  services  they  provide
            depend on the  interaction of their  computer  systems
            with  those  of  brokers,  information  services,  the
            Fund's  Custodian and other  parties.  Therefore,  any
            failure of the  computer  systems of those  parties to
            deal  with the year  2000  may  also  have a  negative
            affect on the services  they provide to the Fund.  The
            extent of that  risk  cannot  be  ascertained  at this
            time."

7.    The second  sentence of the paragraph  entitled  AClass A Shares" in the
section entitled AHow to Buy  Shares-Classes of Shares" on page 26 is modified
to read as follows:

            If  you  purchase   Class  A  shares  as  part  of  an
            investment  of at least $1 million in shares of one or
            more  Oppenheimer  funds,  you will not pay an initial
            sales  charge,  but if you sell  any of  those  shares
            within  18  months  of  buying  them,  you  may  pay a
            contingent deferred sales charge, described below.

8.    The first and second  sentences  of the second  paragraph of the section
entitled  ABuying Class A Shares-Class A Contingent  Deferred Sales Charge" on
page 31 are modified to read as follows:

            If you  redeem  any  Class  A  shares  subject  to the
            contingent   deferred  sales  charge  described  above
            within 18 months of the end of the  calendar  month of
            their  purchase,  a contingent  deferred  sales charge
            (called  the  "Class  A  contingent   deferred   sales
            charge")   may  be   deducted   from  the   redemption
            proceeds.  (A  different  holding  period may apply to
            shares purchased prior to June 1, 1998).

9.    The second  sentence of the fourth  paragraph  of the  section  entitled
ABuying Class A  Shares-Class  A Contingent  Deferred Sales Charge" on page 32
is modified to read as follows:

            However,  if  the  shares  acquired  by  exchange  are
            redeemed  within 18 months of the end of the  calendar
            month of the  purchase of the  exchanged  shares,  the
            contingent   deferred  sales  charge  will  apply.  (A
            different   holding   period   may   apply  to  shares
            purchased prior to June 1, 1998).

10.   The paragraph  entitled  ASpecial  Arrangements With Dealers" on page 32
is hereby deleted.

11.   The following  sub-paragraphs  of the section entitled "Waivers of Class
A Sales Charges" are deleted:

            |_| if, at the time of  purchase  of shares  (prior to
            May 1,  1997) the  dealer  agrees in writing to accept
            the  dealer=s  portion  of  the  sales  commission  in
            installments  of  1/18th of the  commission  per month
            (and no  further  commission  will be  payable  if the
            shares are redeemed within 18 months of purchase);

            |_|  if,  at  the  time  of  purchase  of  shares  (if
            purchased  during  the  period  May  1,  1997  through
            December  31,  1997) the  dealer  agrees in writing to
            accept the  dealer=s  portion of the sales  commission
            in  installments of 1/12th of the commission per month
            (and no  further  commission  will be  payable  if the
            shares are redeemed within 12 months of purchase);

12.   The  sub-section  captioned  AOppenheimerFunds  Internet Web Site@ under
the  heading  ASpecial  Investor  Services@  starting on page 39 is revised as
follows:

            OppenheimerFunds   Internet   Web  Site.   Information
            about the Fund, including your account balance,  daily
            share prices,  market and Fund portfolio  information,
            may  be  obtained  by  visiting  the  OppenheimerFunds
            Internet Web Site, at the following  Internet address:
            http://www.oppenheimerfunds.com.         Additionally,
            certain account  transactions  may be requested by any
            shareholder  listed in the  registration on an account
            as well as by the  dealer  representative  of  record,
            through  a  special  section  of  that  Web  Site.  To
            access  that  section of the Web Site,  you must first
            obtain a  personal  identification  number  ("PIN") by
            calling       OppenheimerFunds       PhoneLink      at
            1-800-533-3310.  If you do not  wish to have  Internet
            account  transactions  capability  for  your  account,
            please call our customer  service  representatives  at
            1-800-525-7048.  To find  out more  information  about
            Internet  transactions  and  procedures,  please visit
            the Web Site.

November 10, 1998                                             PS0355.003



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