EATON VANCE PRIME RATE RESERVES
486APOS, 2000-06-16
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           As filed with the Securities and Exchange Commission on June 16, 2000
                                                     1933 Act File No. 333-32268
                                                     1940 Act File No. 811-05808
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM N-2
                             REGISTRATION STATEMENT
                       UNDER THE SECURITIES ACT OF 1933         [x]
                          PRE-EFFECTIVE AMENDMENT NO.           [ ]
                        POST-EFFECTIVE AMENDMENT NO. 1          [x]
                                     AND/OR
                        REGISTRATION STATEMENT UNDER THE
                        INVESTMENT COMPANY ACT OF 1940          [x]
                               AMENDMENT NO. 23                 [x]
                        (CHECK APPROPRIATE BOX OR BOXES)

                         EATON VANCE PRIME RATE RESERVES
                         -------------------------------
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)

     THE EATON VANCE BUILDING, 255 STATE STREET, BOSTON, MASSACHUSETTS 02109
     -----------------------------------------------------------------------
               (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (617) 482-8260
       ------------------------------------------------------------------

                                 ALAN R. DYNNER
     THE EATON VANCE BUILDING, 255 STATE STREET, BOSTON, MASSACHUSETTS 02109
     -----------------------------------------------------------------------
                     (NAME AND ADDRESS OF AGENT FOR SERVICE)


     If any of the securities being registered on this Form will be offered on a
delayed or continuous  basis in reliance on Rule 415 under the Securities Act of
1933, other than securities  offered in connection with a dividend  reinvestment
plan, check the following box. [x]

It is proposed that this filing will become effective (check appropriate box):

[ ] when delcared effective pursuant to section 8(c)
[ ] immediately upon filing pursuant to paragraph (b)
[ ] on (date) pursuant to paragraph (b)
[x] 60 days after filing pursuant to paragraph (a)
[ ] on (date) pursuant to paragraph (a)

If appropriate, check the following box:

[ ]  This [post  effective]  amendment  designates  a new  effective  date for a
     previously filed [post-effective amendment] [registration statement].

[ ]  This  form is filed  to  register  additional  securities  for an  offering
     pursuant to Rule 462(b) under the  Securities  Act and the  Securities  Act
     registration   statement  number  of  the  earlier  effective  registration
     statement for the same offering is


Senior Debt Portfolio has also executed this Registration Statement.
<PAGE>
     The purpose of this filing is to provide  information about the election of
the  Registrant to adopt the multiple  class  structure in  accordance  with the
Investment  Company Act of 1940 and an exemptive  order expected to be issued by
the  Securities  and Exchange  Commission.  This  information  is set forth in a
supplement  to the  prospectus  and a supplement  to the statement of additional
information.  The prospectus and statement of additional  information were filed
electronically  with the Commission in a  Registration  Statement on Form N-2 on
March 13, 2000  (Accession No.  0000950156-00-000172)  and are  incorporated  by
reference herein.







                                       C-1
<PAGE>
                         EATON VANCE PRIME RATE RESERVES
                              CROSS REFERENCE SHEET
                           ITEMS REQUIRED BY FORM N-2
                           --------------------------

<TABLE>
PART A
ITEM NO.                  ITEM CAPTION                                                PROSPECTUS CAPTION
--------                  ------------                                                ------------------
<S>                       <C>                                         <C>
1.                        Outside Front Cover                         Cover Page
2.                        Inside Front and Outside Back Cover Page    Cover Pages
3.                        Fee Table and Synopsis                      Shareholder and Fund Expenses
4.                        Financial Highlights                        Financial Highlights
5.                        Plan of Distribution                        Purchasing Shares; Shareholder Account Features;
                                                                        Sales Charges
6.                        Selling Shareholders                        Not Applicable
7.                        Use of Proceeds                             Purchasing Shares; Investment Objective, Policies
                                                                        and Risks
8.                        General Description of the Registrant       Organization of the Fund; Investment Objective,
                                                                        Policies and Risks
9.                        Management                                  Management of the Fund; Organization of the Fund

10.                       Capital Stock, Long-Term Debt, and Other    Organization of the Fund; Distributions and Taxes;
                            Securities                                  Shareholder Account Features
11.                       Defaults and Arrears on Senior Securities   Not Applicable
12.                       Legal Proceedings                           Not Applicable
13.                       Table of Contents of the Statement of       Table of Contents of the Statement of Additional
                            Additional Information                      Information

PART B                                                                                STATEMENT OF
ITEM NO.                  ITEM CAPTION                                          ADDITIONAL INFORMATION CAPTION
--------                  ------------                                          ------------------------------
14.                       Cover Page                                  Cover Page
15.                       Table of Contents                           Table of Contents
16.                       General Information and History             Management and Organization
17.                       Investment Objective and Policies           Investment Policies and Risks; Investment
                                                                      Restrictions
18.                       Management                                  Management and Organization; Investment
                                                                      Advisory and Other Services
19.                       Control Persons and Principal Holders of    Control Persons and Principal Holders of Shares
                            Securities

20                        Investment Advisory and Other Services      Investment Advisory and Other Services
21.                       Brokerage Allocation and Other Practices    Portfolio Trading
22.                       Tax Status                                  Taxes
23.                       Financial Statements                        Financial Statements
</TABLE>


                                       C-2
<PAGE>

                  Eaton Vance Senior Floating-Rate Fund Class B
              Eaton Vance Senior Floating-Rate Fund Original Class

                            Supplement to Prospectus
                       of Eaton Vance Prime Rate Reserves
                                      dated
                                 March 15, 2000

     Eaton Vance Senior  Floating-Rate  Fund Class B ("Class B") and Eaton Vance
Senior Floating-Rate Fund Original Class ("Original Class") are classes of Eaton
Vance Senior  Floating-Rate Fund (the "Fund"),  formerly named Eaton Vance Prime
Rate Reserves.

     The Fund now has  three  classes  of shares - Class B,  Original  Class and
Eaton  Vance  Senior  Floating-Rate  Fund  Class A  ("Class  A"),  which  is not
currently  offered.  Class B  shares  are  offered  for  sale  with the fees and
expenses described below. Class B shares automatically  convert to Class A after
six years. The Original Class consists of all outstanding  shares of Eaton Vance
Prime Rate Reserves as of  ______________,  2000.  The Original Class is offered
only to existing shareholders.

1. The following replaces the information under "Shareholder and Fund Expenses"
  on page 3 of the prospectus:

Fees and Expenses.  These tables describe the fees and expenses that you may pay
if you buy and hold shares.

<TABLE>
<CAPTION>
 Shareholder Fees (fees paid directly from your investment)      Original Class      Class A         Class B
-----------------------------------------------------------------------------------------------------------------
<S>                                                                <C>                <C>            <C>
 Maximum Sales Charge (Load) (as a percentage of offering price)    None              None            None
 Dividend Reinvestment Fees                                         None              None            None
 Maximum Early Withdrawal Charge                                    3.00%             None            3.00%
</TABLE>

<TABLE>
<CAPTION>
 Annual Fund Operating Expenses (expenses that are deducted from Fund assets)   Original Class   Class A       Class B
------------------------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>             <C>            <C>
 Investment Advisory Fee (after fee waiver)                                      0.42%           0.42%          0.42%
 Distribution Fee                                                                0.70%           0.00%          0.75%
 Other Expenses* (after administration fee waiver)                               0.13%           0.38%          0.38%
 Total Annual Fund Operating Expenses (after fee waivers)                        1.25%           0.80%          1.55%
</TABLE>
*Other Expenses for Class A and Class B includes a service fee of 0.25%.


Notes: The Fund invests  exclusively in Senior Debt Portfolio (the "Portfolio").
See  "Organization of the Fund".  The table and Example  summarize the aggregate
expenses  of the Fund  and the  Portfolio  and are  designed  to help  investors
understand  the costs and expenses they will bear,  directly or  indirectly,  by
investing in the Fund. Information for the Fund is based on its expenses for the
most recent fiscal year when only the Original Class existed as a separate fund,
adjusted for a revised  advisory fee waiver,  complete waiver of  administration
fees and addition of a distribution  fee to that Class. If the  distribution fee
of  the  Original  Class  were  eliminated,  the  investment  advisory  fee  and
administration  fee waivers would be reduced by the same aggregate  amount,  and
adjustments  would be made to fees of other  Classes so that total  expenses  to
shareholders would remain the same. It is possible that the Trustees of the Fund
or Portfolio  could reduce or eliminate  these waivers even if the  distribution
fee remained the same,  which would  increase Fund  expenses.  If no fee waivers
existed,  the Investment  Advisory Fee would be 0.95%,  the  Administration  Fee
would be 0.25% and Total Annual Fund Operating  Expenses would be  approximately
2.03%,   1.58%  and  2.33%  for  the  Original  Class,  Class  A  and  Class  B,
respectively. Only the Independent Trustees of the Fund and Portfolio can reduce
or eliminate fee waivers. See "Management of the Fund".

<PAGE>
Example.  This  Example is intended to help you compare the cost of investing in
the Fund with the cost of investing in other investment  companies.  The Example
assumes that you invest  $1,000 in the Fund for the time periods  indicated  and
then  have  all of your  shares  repurchased  at the end of those  periods.  The
Example also assumes that your investment has a 5% return each year and that the
operating expenses remain the same.  Although your actual costs may be higher or
lower, based on these assumptions your costs would be:

                                     1 Year       3 Years    5 Years    10 Years
-------------------------------------------------------------------------------
  Original Class shares              $43          $60         $69       $151
  Class A shares                     $ 8          $26         $44       $ 99
  Class B shares                     $46          $69         $84       $185

You  would  pay  the  following  expenses  if  you  did  not  have  your  shares
repurchased.

                                     1 Year    3 Years    5 Years    10 Years
-------------------------------------------------------------------------------
  Original Class shares              $13       $40       $69        $151
  Class A shares                     $ 8       $26       $44        $ 99
  Class B shares                     $16       $49       $84        $185

2. The following supplements the information under "Performance  Information" on
page 6 of the prospectus:

     The performance  information in the prospectus is for the Original Class of
     shares.  Based upon  estimated  expenses,  the  performance  of the Class A
     shares will be slightly  higher and the  performance  of the Class B shares
     will be slightly lower than the Original Class.

3. The following supplements the information under "Special Investment Practices
- Securities Lending" on page 12 of the prospectus:

     If  permitted  by  an  exemptive  order  of  the  Securities  and  Exchange
     Commission,  the  Portfolio  may also  lend  cash to  investment  companies
     advised by the Eaton Vance  organization if the return is higher than other
     short-term investment options.

4. The following  sentences are added to the first paragraph under "Organization
of the Fund" on page 12 of the prospectus:

     The Fund offers  multiple  classes of shares.  Each Class  represents a pro
     rata interest in the Fund, but is subject to different expenses and rights.

5. The following  supplements the information under "Purchasing  Shares" on page
15 of the prospectus:

     Please include the name of the Class of shares with each investment.

6. The  following  language  replaces  the first  two  paragraphs  under  "Sales
Charges" on page 15 of the prospectus:

     Shareholders pay no sales load when purchasing shares of the Original Class
     or Class B shares.  The principal  underwriter  will make payments from its
     own assets at the rate of 3.0% of the dollar  amount of such  shares  being
     purchased  to  investment  dealers  who  have  sales  agreements  with  the
     principal underwriter.

     If the Original Class shares remain  outstanding for at least one year from
     the  date of  their  original  purchase,  the  principal  underwriter  will
     compensate the investment dealers at an annual rate, paid quarterly,  equal
     to .10% for the second year,  .15% for the third year,  .20% for the fourth
     year,  .25% for the fifth year and .30% for the sixth  year and  subsequent
     years,  of the  value of  Original  Class  shares  sold by such  investment
     dealers and remaining outstanding. If the Class B shares remain outstanding
     for at least  one  year  from the  date of  their  original  purchase,  the
     principal  underwriter will compensate the investment  dealers at an annual
     rate,  paid quarterly,  equal to .15% for the second and third years,  .20%
     for the fourth year, and .25% for the fifth year and subsequent  years,  of
     the value of Class B shares sold by such  investment  dealers and remaining
     outstanding  (including shares converted to Class A). All compensation paid
     to investment dealers will be made from BMR's, the principal  underwriter's
     and Eaton  Vance's own assets,  which may include  amounts  received by the
     principal  underwriter as early  withdrawal  charges or distribution  fees,
     service fees, amounts received by BMR under its Advisory Agreement with the
     Portfolio  and amounts  received  by Eaton  Vance under its  Administration

<PAGE>

     Agreement with the Fund. The  compensation  paid to investment  dealers and
     the principal  underwriter is subject to applicable  limitations imposed by
     the National Association of Securities Dealers, Inc. ("NASD").

The following  language is added at the end of "Sales Charges" on page 15 of the
prospectus:

     Class B  Conversion  Feature.  After the longer of six years or at the time
     when the early withdrawal charge applicable to your Class B shares expires,
     Class B shares will automatically convert to Class A shares. Class B shares
     acquired  through  the  reinvestment  of  distributions   will  convert  in
     proportion to shares not so acquired.

7. The following  language  replaces the paragraph  titled  "Distribution  Plan"
under "Sales Charges" on page 16 of the prospectus:

     Distribution  Plan. Shares of the Original Class and Class B shares have in
     effect a plan that  allows the Fund to pay  distribution  fees for the sale
     and distribution of shares.  The Original Class pays  distribution  fees of
     0.70% of average daily net assets annually.  Class B pays distribution fees
     of 0.75% of average daily net assets annually.  In addition,  the Fund pays
     service fees on Class A and Class B shares for personal services and/or the
     maintenance   of  shareholder   accounts  to  the  principal   underwriter,
     investment  dealers  and other  persons in amounts  not  exceeding  .25% of
     average daily net assets of each such Class for each fiscal year.  All such
     payments are limited by the sales  charge rule of the National  Association
     of Securities Dealers, Inc. as if such rule were applicable.

8. The following  supplements the information under "Repurchase  Offers" on page
16 of the prospectus:

     Repurchase  Offers  will be made to all  Classes of the Fund on a quarterly
     basis. Shareholders of each Class have the same repurchase offer rights. If
     a  shareholder  holds both  Class A and Class B shares,  it will be assumed
     that  Class  A  shares  are  being  offered  for  repurchase  first.  If  a
     shareholder  holds both Original Class and Class B shares,  the shareholder
     will need to specify the Class the shareholder wishes to have repurchased.

9. The following  supplements  the  information  in "Exchange  Privilege"  under
"Shareholder Account Features" on page 17 of the prospectus:

     Once a  shareholder's  Class B shares  convert to Class A shares  after six
     years, a shareholder will have the ability to exchange those Class A shares
     for  Class A shares of one or more  open-end  investment  companies  in the
     Eaton Vance Group of Funds.  Class A shares  will not be  available  in the
     Exchange Privilege for six years from the date of this supplement.



August ___, 2000                                                      PRPPS

<PAGE>

                  Eaton Vance Senior Floating-Rate Fund Class B
              Eaton Vance Senior Floating-Rate Fund Original Class

                Supplement to Statement of Additional Information
                       of Eaton Vance Prime Rate Reserves
                                      dated
                                 March 15, 2000


1.  The  following  replaces   investment   restriction  (5)  under  "Investment
Restrictions" on page 4 of the Statement of Additional Information:

     (5) Make  loans to other  persons,  except by (a) the  acquisition  of loan
     interests,  debt  securities  and  other  obligations  in which the Fund is
     authorized  to invest  in  accordance  with its  investment  objective  and
     policies,  (b)  entering  into  repurchase  agreements,   (c)  lending  its
     portfolio securities and (d) lending cash consistent with applicable law.

2. The following sentences are added to the first paragraph under "Organization"
under  "Management  and  Organization"  on page 7 of the Statement of Additional
Information:

     The Fund  established  multiple classes and changed its name to Eaton Vance
     Senior  Floating-Rate  Fund (the "Fund") on  __________________,  2000. The
     Fund now has three  classes of shares - Eaton  Vance  Senior  Floating-Rate
     Fund Original Class ("Original  Class"),  Eaton Vance Senior  Floating-Rate
     Fund Class A ("Class A") and Eaton Vance Senior  Floating Rate Fund Class B
     ("Class B"). The operations of the Original Class reflect the operations of
     the Fund  prior to  ____________,  2000.  The Fund may  issue an  unlimited
     number  of  shares  of  beneficial  interest  (no par  value).  Each  Class
     represents an interest in the Fund,  but is subject to different  expenses,
     rights  and   privileges.   The  Trustees  have  the  authority  under  the
     Declaration of Trust to create additional  classes of shares with differing
     rights and privileges.

3. The following  supplements the  information  under  "Investment  Advisory and
Other  Services-Distribution  Plan" on page 10 of the  Statement  of  Additional
Information:

     The Fund's  Distribution  Plan now  applies to all Classes of shares at the
     fee rates set forth in the  Prospectus.  The  Trustees of the Fund may take
     actions  involving the Plan that affect only one Class, and shareholders of
     each Class have separate voting rights with respect to the Plan.

4. The following paragraph is added to "Shareholder Account Information" on page
11 of the Statement of Additional Information:

     CLASS B CONVERSION.  Class B shares held for the longer of (i) six years or
     (ii) the time at which the CDSC  applicable  to such  shares  expires  (the
     "holding  period")  will  automatically  convert  to  Class A  shares.  For
     purposes of this conversion, all distributions paid on Class B shares which
     the shareholder  elects to reinvest in Class B shares will be considered to
     be held in a separate  sub-account.  Upon the  conversion of Class B shares
     not acquired through the reinvestment of distributions,  a pro rata portion
     of the Class B shares held in the sub-account  will also convert to Class A
     shares.  This  portion  will be  determined  by the ratio  that the Class B
     shares  being  converted  bear to the  total of  Class B shares  (excluding
     shares  acquired  through  reinvestment)  in the account.  This  conversion
     feature is  subject to the  continuing  availability  of a ruling  from the
     Internal  Revenue  Service or an opinion of counsel that the  conversion is
     not taxable for federal income tax purposes.


August ___, 2000                                                      PRSAI




<PAGE>
                                     PART C

                                OTHER INFORMATION

ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS

     (1) FINANCIAL STATEMENTS:

          INCLUDED IN PART A:

          Financial highlights for each of the ten years ended December 31, 1999

          INCLUDED IN PART B:

               INCORPORATED BY REFERENCE TO THE ANNUAL REPORT DATED DECEMBER 31,
               1999 (ACCESSION NO.  0000950156-00-000125),  FILED ELECTRONICALLY
               PURSUANT  TO SECTION  30(B)(2) OF THE  INVESTMENT  COMPANY ACT OF
               1940.

            Financial Statements for EATON VANCE PRIME RATE RESERVES:
               Statement of Assets and Liabilities as of December 31, 1999
               Statement of Operations for the year ended December 31, 1999
               Statements of Changes in Net Assets for each of the two years
                 ended December 31, 1999
               Statement of Cash Flows for the year ended December 31, 1999
               Financial Highlights for the five years ended December 31, 1999
               Notes to Financial Statements
               Independent Auditors' Report

            Financial Statements for SENIOR DEBT PORTFOLIO:
               Portfolio of Investments as of December 31, 1999
               Statement of Assets and Liabilities as of December 31, 1999
               Statement of Operations for the year ended December 31, 1999
               Statements of Changes in Net Assets for each of the two years
                 ended December 31, 1999
               Statement of Cash Flows for the year ended  December 31, 1999
               Supplementary Data for the four years ended December 31, 1999 and
                 for the period from the start of business, February 22, 1995,
                 to December 31, 1995
               Notes to Financial Statements
               Independent Auditors' Report

     (2) EXHIBITS:

          (a)(a)    Declaration  of Trust  dated May 2,  1989,  as  amended  and
                    restated  June 30,  1989,  filed as  Exhibit  (a)(a)  to the
                    Registration  Statement  under  the  Securities  Act of 1933
                    (1933 Act File No.  333-63623)  and  Amendment No. 14 to the
                    Registration  Statement under the Investment  Company Act of
                    1940 (1940 Act File No. 811-05808) filed with the Commission
                    on October  24,  1995  (Amendment  No. 14) and  incorporated
                    herein by reference.

             (b)    Amended and  Restated  Agreement  and  Declaration  of Trust
                    dated April 26, 2000 filed herewith.

             (c)    Amendment  to  the  Declaration  of  Trust  to be  filed  by
                    Amendment.

             (d)    Establishment  and  Designation  of  Classes  of  Shares  of
                    Beneficial  Interest,  Without  Par  Value  to be  filed  by
                    Amendment.

          (b)(a)    By-Laws (as amended June 12,  1989) filed as Exhibit  (b)(a)
                    to Amendment No. 14 and incorporated herein by reference.

             (b)    By-Laws  Amendment  dated December 13, 1993 filed as Exhibit
                    (b)(b)  to  Amendment  No.  14 and  incorporated  herein  by
                    reference.


                                       C-3
<PAGE>
             (c)    Not applicable

             (d)    Not applicable

             (e)    Not applicable

             (f)    Not applicable

             (g)    Not applicable

          (h)(a)    Distribution  Agreement  dated  November  1,  1996  filed as
                    Exhibit  (h)(a)  to  Post-Effective  Amendment  No. 1 to the
                    Registration  Statement  under  the  Securities  Act of 1933
                    (1933 Act File No.  333-25731)  and  Amendment No. 17 to the
                    Registration  Statement under the Investment  Company Act of
                    1940 (1940 Act File No. 811-05808) filed with the Commission
                    on July 2, 1997 (Amendment No. 17) and  incorporated  herein
                    by reference.

             (b)    Distribution Agreement to be filed by Amendment.

             (c)    Selling Group  Agreement  between Eaton Vance  Distributors,
                    Inc. and  Authorized  Dealers filed as Exhibit (6)(b) to the
                    Post-Effective  Amendment No. 61 filed  December 28, 1995 to
                    the Registration Statement of Eaton Vance Growth Trust (File
                    Nos.  2-22019  and  811-1241)  and  incorporated  herein  by
                    reference.

          (i)       The  Securities  and  Exchange  Commission  has  granted the
                    Registrant an exemptive order that permits the Registrant to
                    enter  into  deferred  compensation  arrangements  with  its
                    independent Trustees.  See in the Matter of Capital Exchange
                    Fund, Inc., Release No. IC-20671 (November 1, 1994).

          (j)(a)    Custodian Agreement dated December 17, 1990 filed as Exhibit
                    (j)  to  Amendment  No.  14  and   incorporated   herein  by
                    reference.

             (b)    Amendment  to  Custodian  Agreement  dated  October 23, 1995
                    filed as Exhibit (j)(b) to the Post-Effective  Amendment No.
                    1 to the Registration  Statement under the Securities Act of
                    1933 (1933 Act File No.  33-63623)  and  Amendment No. 15 to
                    the Registration  Statement under the Investment Company Act
                    of 1940  (1940  Act  File  No.  811-05808)  filed  with  the
                    Commission  on  April  1,  1996   (Amendment   No.  15)  and
                    incorporated herein by reference.

             (c)    Amendment to Master Custodian  Agreement with Investors Bank
                    & Trust Company dated December 21, 1998 as Exhibit (g)(3) to
                    the  Registration  Statement of Eaton Vance Municipals Trust
                    (File   Nos.    33-572   and   811-4409)    (Accession   No.
                    0000950156-99-000050)    filed    January   25,   1999   and
                    incorporated herein by reference.

          (k)(a)    Administration  Agreement  dated  July  14,  1989  filed  as
                    Exhibit (k)(a) to Amendment No. 14 and  incorporated  herein
                    by reference.

             (b)    Administration  Agreement  Amendment  dated October 24, 1994
                    filed as Exhibit (k)(b) to Amendment No. 14 and incorporated
                    herein by reference.

             (c)    Distribution Plan adopted December 21, 1998 filed as Exhibit
                    (k)(c) to the  Registration  Statement  under the Securities
                    Act of 1933 (1933 Act File No.  333-72711) and Amendment No.
                    20  to  the  Registration  Statement  under  the  Investment
                    Company Act of 1940 (1940 Act File No. 811-05808) filed with
                    the  Commission on February 22, 1999  (Amendment No. 20) and
                    incorporated herein by reference.

             (d)    Distribution and Service Plan to be filed by Amendment.


                                       C-4
<PAGE>
             (e)    Transfer  Agency  Agreement  as of  January 1, 1998 filed as
                    Exhibit (k)(b) to the Registration  Statement on Form N-2 of
                    Eaton Vance Advisers  Senior  Floating-Rate  Fund (File Nos.
                    333-46853,  811-08671) (Accession No.  0000950156-98-000172)
                    filed   February  25,  1998  and   incorporated   herein  by
                    reference.

             (f)    Amendment to the Transfer Agency Agreement dated October 18,
                    1999  filed  as  Exhibit   (h)(2)(b)  to  the   Registration
                    Statement of Eaton Vance  Municipals Trust (File Nos. 33-572
                    and  811-4409)  (Accession  No.   000950156-99-000723)   and
                    incorporated herein by reference.

          (l)       Opinion and Consent of Counsel dated March 10, 2000 filed as
                    Exhibit  (l)  to  the   Registration   Statement  under  the
                    Securities  Act of 1933  (1933 Act File No.  333-32268)  and
                    Amendment  No. 22 to the  Registration  Statement  under the
                    Investment Company Act of 1940 (1940 Act File No. 811-05808)
                    filed with the  Commission on March 13, 2000  (Amendment No.
                    22) and incorporated herein by reference.

          (m)       Not applicable

          (n)       Consent of Independent Auditors filed herewith.

          (o)       Not applicable

          (p)       Not applicable

          (q)       Not applicable

          (r)       Code of Ethics filed as Exhibit (r) to Amendment  No. 22 and
                    incorporated herein by reference.

          (s)(a)    Power of Attorney for Eaton Vance Prime Rate Reserves  dated
                    February 14, 1997 filed as Exhibit (r) to  Amendment  No. 17
                    and incorporated herein by reference.

             (b)    Power of Attorney for Eaton Vance Prime Rate Reserves  dated
                    November 16, 1998 filed as Exhibit  (s)(b) to Amendment  No.
                    20 and incorporated herein by reference.

          (t)(a)    Power of Attorney for Senior Debt  Portfolio  dated February
                    14,  1997  filed as  Exhibit  (s) to  Amendment  No.  17 and
                    incorporated herein by reference.

             (b)    Power of Attorney for Senior Debt  Portfolio  dated November
                    16,  1998 filed as Exhibit  (t)(b) to  Amendment  No. 20 and
                    incorporated herein by reference.

ITEM 25. MARKETING ARRANGEMENTS

     Not applicable.


                                       C-5
<PAGE>
ITEM 26. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The  following  table  sets  forth the  approximate  expenses  incurred  in
connection with the offerings of Registrant:

Registrant Fees                                                    $2,392,930(1)
National Association of Securities Dealers, Inc. Fees              $  168,000(1)
Printing (other than stock certificates)                           $  208,000
Engraving and printing stock certificates                          $    4,800
Fees and expenses of qualification under state
  securities laws (excluding fees of counsel)                      $  282,350
Accounting fees and expenses                                       $   13,500
Legal fees and expenses                                            $  230,000
                                                                   -------------
        Total                                                      $3,299,580(1)

-------------------------------
(1)  These amounts include  expenses for the shares  registered  pursuant to the
     Registration  Statements  declared  effective  on May  3,  1989  (File  No.
     33-28516);  August 9,  1989  (File No.  33-30268);  July 3, 1990  (File No.
     33-34922);  November  28, 1995 (File No.  33-63623);  May 1, 1997 (File No.
     333-25731);  November 2, 1998 (File No.  333-65869);  May 3, 1999 (File No.
     333-72711); and March 15, 2000 (File No. 333-32268).

ITEM 27. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL

     None.

ITEM 28. NUMBER OF HOLDERS OF SECURITIES

               (1)                                  (2)
          TITLE OF CLASS                  NUMBER OF RECORD HOLDERS
   Shares of benefical interest                    95,555
                                                   as of
                                                June 1, 2000

ITEM 29. INDEMNIFICATION

     The Registrant's By-Laws contains indemnification provisions.  Registrant's
Trustees and officers are insured under a standard investment company errors and
omissions  insurance policy covering loss incurred by reason of negligent errors
and omissions committed in their capacities as such.

     The  distribution  agreement of the Registrant also provides for reciprocal
indemnity of the  principal  underwriter  on the one hand,  and the Trustees and
officers, on the other.

ITEM 30. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER

     Reference  is made to: (i) the  information  set forth  under the  captions
"Management  of the  Fund"  in  the  Prospectus  and  "Investment  Advisory  and
Administrative  Services" in the Statement of Additional  Information;  (ii) the
Eaton Vance Corp. 10-K filed under the Securities Exchange Act of 1934 (File No.
1-8100);  and (iii) the Forms ADV of Eaton Vance Management (File No. 801-15930)
and  Boston  Management  and  Research  (File  No.  801-43127)  filed  with  the
Commission, all of which are incorporated herein by reference.


                                       C-6
<PAGE>
ITEM 31. LOCATION OF ACCOUNTS AND RECORDS

     All applicable  accounts,  books and documents required to be maintained by
the  Registrant by Section 31(a) of the  Investment  Company Act of 1940 and the
Rules  promulgated   thereunder  are  in  the  possession  and  custody  of  the
Registrant's  custodian,  Investors Bank & Trust Company,  200 Clarendon Street,
16th Floor,  Boston, MA 02116, and its transfer agent, PFPC, Inc., 4400 Computer
Drive,  Westborough,  MA  01581-5120,  with the  exception of certain  corporate
documents  and  portfolio  trading  documents  which are in the  possession  and
custody of Eaton Vance Management,  The Eaton Vance Building,  255 State Street,
Boston, MA 02109. Registrant is informed that all applicable accounts, books and
documents required to be maintained by registered investment advisers are in the
custody and  possession  of Eaton Vance  Management  and Boston  Management  and
Research.

ITEM 32. MANAGEMENT SERVICES

     None.

ITEM 33. UNDERTAKINGS

     The undersigned Registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment to this Registration Statement:

          (i) To include  any  prospectus  required  by section  10(a)(3) of the
     Securities Act of 1933;

          (ii) To reflect in the  prospectus  any facts or events  arising after
     the  effective  date of the  Registration  Statement  (or the  most  recent
     post-effective amendment thereof) which,  individually or in the aggregate,
     represent  a  fundamental  change  in  the  information  set  forth  in the
     Registration Statement;

          (iii) To include any material  information with respect to the plan of
     distribution not previously disclosed in the Registration  Statement or any
     material change to such information in the Registration Statement;

     (2) That, for the purpose of determining any liability under the Securities
Act of 1933,  each  such  post-effective  amendment  shall be deemed to be a new
Registration  Statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof;

     (3) To remove from registration by means of a post-effective  amendment any
of the securities being registered which remain unsold at the termination of the
continuos offering of the shares; and

     (4) To send by first class mail or other means  designed to ensure  equally
prompt  delivery,  within  two  business  days of  receipt  of a written or oral
request, any Statement of Additional Information.


                                       C-7
<PAGE>
                                   SIGNATURES


     Pursuant  to  the  requirements  of the  Securities  Act of  1933  and  the
Investment Company Act of 1940, the Registrant has duly caused this Amendment to
the  Registration  Statement  to be  signed on its  behalf  by the  undersigned,
thereunto  duly  authorized  in the  City of  Boston,  and the  Commonwealth  of
Massachusetts, on June 14, 2000.


                                EATON VANCE PRIME RATE RESERVES


                                By:     /s/ James B. Hawkes
                                        ------------------------------
                                        James B. Hawkes, President


     Pursuant to the  requirements of the Securities Act of 1933, this Amendment
to the Registration  Statement has been signed below by the following persons in
the capacities on June 14, 2000.


Signature                       Title
---------                       -----

/s/ James B. Hawkes             Trustee, President and Principal
--------------------------      Executive Officer
James B. Hawkes

/s/ James L. O'Connor           Treasurer (Principal Financial and
--------------------------      Accounting Officer)
James L. O'Connor

Jessica M. Bibliowicz*          Trustee
--------------------------
Jessica M. Bibliowicz

Donald R. Dwight*               Trustee
--------------------------
Donald R. Dwight

Samuel L. Hayes, III*           Trustee
--------------------------
Samuel L. Hayes, III

Lynn A. Stout*                  Trustee
--------------------------
Lynn A. Stout

Jack L. Treynor*                Trustee
--------------------------
Jack L. Treynor

*By:  /s/ Alan R. Dynner
      --------------------------
      Alan R. Dynner (As attorney-in-fact)



                                       C-8
<PAGE>
                                   SIGNATURES


     Senior Debt  Portfolio has duly caused this  Amendment to the  Registration
Statement on Form N-2 of Eaton Vance Prime Rate Reserves (File No. 333-32268) to
be signed on its behalf by the  undersigned,  thereunto  duly  authorized in the
City of Boston and the Commonwealth of Massachusetts, on June 14, 2000.


                                SENIOR DEBT PORTFOLIO



                                By:     /s/ JAMES B. HAWKES
                                        -----------------------------
                                        James B. Hawkes, President


     Pursuant to the  requirements of the Securities Act of 1933, this Amendment
to the Registration  Statement has been signed below by the following persons in
their capacities and on June 14, 2000.


Signature                       Title
---------                       -----

/s/ James B. Hawkes             Trustee, President and Principal
--------------------------      Executive Officer
James B. Hawkes

/s/ James L. O'Connor           Treasurer (Principal Financial and
--------------------------      Accounting Officer)
James L. O'Connor

Jessica M. Bibliowicz*          Trustee
--------------------------
Jessica M. Bibliowicz

Donald R. Dwight*               Trustee
--------------------------
Donald R. Dwight

Samuel L. Hayes, III*           Trustee
--------------------------
Samuel L. Hayes, III

Lynn A. Stout*                  Trustee
--------------------------
Lynn A. Stout

Jack L. Treynor*                Trustee
--------------------------
Jack L. Treynor

*By:  /s/ Alan R. Dynner
      --------------------------
      Alan R. Dynner (As attorney-in-fact)



                                       C-9
<PAGE>
                                  EXHIBIT INDEX


Exhibit No.    Description
-----------    -----------

(a)(b)         Amended and Restated  Agreement  and  Declaration  of Trust dated
               April 26, 2000

(n)            Consent of Independent Auditors



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