DEFINED ASSET FUNDS MUNICIPAL INVT TR FD MON PYMT SER 77
485BPOS, 1998-11-20
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 20, 1998
 
                                                        REGISTRATION NO. 2-59963
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                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                   ------------------------------------------
 
                        POST-EFFECTIVE AMENDMENT NO. 21
                                       TO
                                    FORM S-6
 
                   ------------------------------------------
 
                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2
 
                   ------------------------------------------
 
A. EXACT NAME OF TRUST:
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                           MONTHLY PAYMENT SERIES--77
 
B. NAME OF DEPOSITOR:
 
                   MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
                       PRUDENTIAL SECURITIES INCORPORATED
                           DEAN WITTER REYNOLDS INC.
 
C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:
 
                     MERRILL LYNCH, PIERCE, FENNER & SMITH
                                  INCORPORATED
                              DEFINED ASSET FUNDS
                              POST OFFICE BOX 9051
                            PRINCETON, NJ 08543-9051
 

  PRUDENTIAL SECURITIES
      INCORPORATED
   ONE NEW YORK PLAZA
   NEW YORK, NY 10292                             DEAN WITTER REYNOLDS INC.
                                                       TWO WORLD TRADE
                                                     CENTER--59TH FLOOR
                                                     NEW YORK, NY 10048

 
D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:
 

                                                         COPIES TO:
                                                   PIERRE DE SAINT PHALLE,
  TERESA KONCICK, ESQ.                                      ESQ.
      P.O. BOX 9051                                 450 LEXINGTON AVENUE
PRINCETON, NJ 08543-9051                             NEW YORK, NY 10017
 
                                                     DOUGLAS LOWE, ESQ.
                                                  DEAN WITTER REYNOLDS INC.
   LEE B. SPENCER, JR.                                 TWO WORLD TRADE
   ONE NEW YORK PLAZA                                CENTER--59TH FLOOR
   NEW YORK, NY 10292                                NEW YORK, NY 10048

 
The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year on March 10, 1998.
 
Check box if it is proposed that this filing will become effective on November
27, 1998 pursuant to paragraph (b) of Rule 485.  / x /
 
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<PAGE>
                                     DEFINED ASSET FUNDSSM
- --------------------------------------------
- -----------------------------------
 

                              MUNICIPAL INVESTMENT TRUST FUND
                              MONTHLY PAYMENT SERIES--77
                              (A UNIT INVESTMENT TRUST)
                              O   PORTFOLIO OF LONG TERM MUNICIPAL BONDS
                              O   DESIGNED FOR FEDERALLY TAX-FREE INCOME
                              O   MONTHLY INCOME DISTRIBUTIONS

 

SPONSORS:                      -------------------------------------------------
Merrill Lynch,                 The Securities and Exchange Commission has not
Pierce, Fenner & Smith         approved or disapproved these Securities or
Incorporated                   passed upon the adequacy of this prospectus. Any
Dean Witter Reynolds Inc.      representation to the contrary is a criminal
Prudential Securities          offense.
Incorporated                   Prospectus dated November 27, 1998.

 
<PAGE>
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Defined Asset FundsSM
Defined Asset FundsSM is America's oldest and largest family of unit investment
trusts, with over $115 billion sponsored over the last 25 years. Defined Asset
Funds has been a leader in unit investment trust research and product
innovation. Our family of Funds helps investors work toward their financial
goals with a full range of quality investments, including municipal, corporate
and government bond portfolios, as well as domestic and international equity
portfolios.
 
Defined Asset Funds offer a number of advantages:
   o A disciplined strategy of buying and holding with a long-term view is the
     cornerstone of Defined Asset Funds.
   o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
     funds are not managed and portfolio changes are limited.
o Defined Portfolios: We choose the stocks and bonds in advance, so you know
  what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
      appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.
 
THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF THE EVALUATION DATE,
AUGUST 31, 1998.
 

CONTENTS
                                                              PAGE
                                                         ---------
Risk/Return Summary....................................          3
What You Can Expect From Your Investment...............          7
   Monthly Income......................................          7
   Return Figures......................................          7
   Records and Reports.................................          7
The Risks You Face.....................................          8
   Interest Rate Risk..................................          8
   Call Risk...........................................          8
   Reduced Diversification Risk........................          8
   Liquidity Risk......................................          8
   Concentration Risk..................................          8
   Bond Quality Risk...................................          9
   Insurance Related Risk..............................          9
   Litigation and Legislation Risks....................          9
Selling or Exchanging Units............................          9
   Sponsors' Secondary Market..........................          9
   Selling Units to the Trustee........................         10
   Exchange Option.....................................         10
How The Fund Works.....................................         10
   Pricing.............................................         10
   Evaluations.........................................         11
   Income..............................................         11
   Expenses............................................         11
   Portfolio Changes...................................         11
   Fund Termination....................................         12
   Certificates........................................         12
   Trust Indenture.....................................         12
   Legal Opinion.......................................         13
   Auditors............................................         13
   Sponsors............................................         13
   Trustee.............................................         13
   Underwriters' and Sponsors' Profits.................         13
   Public Distribution.................................         14
   Code of Ethics......................................         14
   Year 2000 Issues....................................         14
Taxes..................................................         14
Supplemental Information...............................         15
Financial Statements...................................        D-1

 
                                       2
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RISK/RETURN SUMMARY
 

       1.  WHAT IS THE FUND'S OBJECTIVE?
           The Fund seeks interest income that is exempt from regular
           federal income taxes by investing in a fixed portfolio
           consisting primarily of municipal revenue bonds with an
           estimated average life of 12 years.
       2.  WHAT ARE MUNICIPAL REVENUE BONDS?
           Municipal revenue bonds are bonds issued by states,
           municipalities and public authorities to finance the cost
           of buying, building or improving various projects intended
           to generate revenue, such as airports, health care
           facilities, housing and municipal electric, water and sewer
           utilities. Generally, payments on these bonds depend solely
           on the revenues generated by the projects, excise taxes or
           state appropriations, and are not backed by the
           government's taxing power.
       3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
        O  The Fund plans to hold to maturity 11 long-term tax-exempt
           municipal bonds with a current aggregate face amount of
           $4,835,000. The Fund is a unit investment trust which means
           that, unlike a mutual fund, the Fund's portfolio is not
           managed. When the bonds were initially deposited (November
           15, 1977), they were rated A or better by Standard &
           Poor's, Moody's or Fitch, or in the opinion of the agent
           for the Sponsors had similar credit quality to bonds rated
           A or better. The credit quality of the bonds may currently
           be lower.
        o  Many of the bonds can be called at a premium declining over
           time to par value. Some bonds may be called earlier at par
           for extraordinary reasons. 39% of the bonds are currently
           callable.
 
           The Portfolio consists of municipal bonds of the following
           types:

 

                                                 APPROXIMATE
                                                  PORTFOLIO
                                                  PERCENTAGE

 

o          General Obligation                               6%
        o  Housing                                          14%
o          Public Housing Authority                       3%
o          Refunded Bonds                                 62%
        o  State/Local Municipal Electric Utilities      15%

 

       4.  WHAT ARE THE SIGNIFICANT RISKS?
           YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
           HAPPEN FOR VARIOUS REASONS, INCLUDING:
        o  Rising interest rates, an issuer's worsening financial
           condition or a drop in bond ratings can reduce the price of
           your units.
        o  The Fund is concentrated in refunded bonds.
        o  Assuming no changes in interest rates, when you sell your
           units, they will generally be worth less than your cost
           because your cost included a sales fee.
        o  The Fund will receive early returns of principal if bonds
           are called or sold before they mature. If this happens your
           income will decline and you may not be able to reinvest the
           money you receive at as high a yield or as long a maturity.

 

       5.  IS THIS FUND APPROPRIATE FOR YOU?
           Yes, if you want monthly income free from regular federal
           income tax. You will benefit from a professionally selected
           and supervised portfolio whose risk is reduced by investing
           in bonds of several different issuers.
           The Fund is not appropriate for you if you want a
           speculative investment that changes to take advantage of
           market movements, if you do not want a tax-advantaged
           investment or if you cannot tolerate any risk.

 
                                       3
<PAGE>
 
           DEFINING YOUR INCOME
 

           WHAT YOU MAY EXPECT (PAYABLE ON THE 25TH DAY OF
           EACH MONTH):
           Regular Monthly Income per unit                   $    1.89
           Annual Income per unit                            $   22.71
           RECORD DAY: 10th day of each month
           These figures are estimates on the evaluation date; actual
           payments may vary.

 

       6.  WHAT ARE THE FUND'S FEES AND EXPENSES?
           This table shows the costs and expenses you may pay,
           directly or indirectly, when you invest in the Fund.

 

           INVESTOR FEES
                                                               2.90%
           Maximum Sales Fee (Load) on new purchases
           (as a percentage of $1,000 invested)

 

           Employees of some of the Sponsors and their affiliates may
           be charged a reduced sales fee of no less than $5.00 per
           Unit.
           The maximum sales fee is reduced if you invest at least
           $100,000, as follows:

 

                                                 YOUR MAXIMUM
                                                    SALES FEE
                     IF YOU INVEST:                  WILL BE:
           -----------------------------------  -----------------
           Less than $100,000                            2.90%
           $100,000 to $249,999                          2.65%
           $250,000 to $499,999                          2.40%
           $500,000 to $999,999                          2.15%
           $1,000,000 and over                           1.90%
 
           Maximum Exchange Fee                          1.90%

 
           ESTIMATED ANNUAL FUND OPERATING EXPENSES
 

                                                                        AMOUNT
                                                                      PER UNIT
                                                                    -----------
                                                         $    0.28
           Trustee's Fee
                                                         $    0.10
           Portfolio Supervision,
           Bookkeeping and
           Administrative Fees
                                                         $    0.31
           Evaluator's Fee
                                                         $    0.37
           Other Operating Expenses
                                                        -----------
                                                         $    1.06
           TOTAL

 

       7.  HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
           In the following chart we show past performance of prior
           Monthly Payment Series, which had the same investment
           objectives, strategies and types of bonds as this Fund.
           These prior series differed in that they charged a higher
           sales fee. These prior Monthly Payment Series were offered
           between January 26, 1988 and September 30, 1996 and were
           outstanding on September 30, 1998. OF COURSE, PAST
           PERFORMANCE OF PRIOR SERIES IS NO GUARANTEE OF FUTURE
           RESULTS OF THIS FUND.
 
           AVERAGE ANNUAL COMPOUND TOTAL RETURNS
           FOR PRIOR SERIES
           Reflecting all expenses. For periods ended 9/30/98.

 

                   WITH SALES FEE                    NO SALES FEE
            1 YEAR     5 YEARS   10 YEARS    1 YEAR     5 YEARS   10 YEARS

 
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High         7.06%      5.51%      7.59%     11.32%      6.50%      8.19%
Average      4.42       4.72       7.42       7.81       5.73       8.01
Low          2.58       4.06       7.27       4.28       5.08       7.87

 
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Average
Sales fee    3.29%      5.00%      5.75%

 
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Note: All returns represent changes in unit price with distributions reinvested
 into the Municipal Fund Investment Accumulation Program.
 

       8.  IS THE FUND MANAGED?
           Unlike a mutual fund, the Fund is not managed and bonds are
           not sold because of market changes. Rather, experienced
           Defined Asset Funds financial analysts regularly review the
           bonds in the Fund. The Fund may sell a bond if certain
           adverse credit or other conditions exist.
       9.  HOW DO I BUY UNITS?
           The minimum investment is $250.
           You can buy units from any of the Sponsors and other
           broker-dealers. The Sponsors are listed later in this
           prospectus. Some banks may offer units for sale through
           special arrangements with the Sponsors, although certain
           legal restrictions may apply.

 
                                       4
<PAGE>
 

           UNIT PRICE PER UNIT                       $438.17
           (as of August 31, 1998)
           Unit price is based on the net asset value of the Fund plus
           the sales fee. An amount equal to any principal cash, as
           well as net accrued but undistributed interest on the unit,
           is added to the unit price. An independent evaluator prices
           the bonds at 3:30 p.m. Eastern time every business day.
           Unit price changes every day with changes in the prices of
           the bonds in the Fund.
           UNIT PAR VALUE                          $1,000.00
           Unit par value means the total amount of money you should
           generally receive on each unit by the termination of the
           Fund (other than interest and premium on the bonds). This
           total amount assumes that all bonds in the Fund are either
           paid at maturity or called by the issuer at par or are sold
           by the Fund at par. If you sell your units before the Fund
           terminates, you may receive more or less than the unit par
           value.
 
      10.  HOW DO I SELL UNITS?
           You may sell your units at any time to any
           Sponsor or the Trustee for the net asset
           value determined at the close of business on
           the date of sale, less any remaining deferred
           sales fee. You will not pay any other fee
           when you sell your units.
      11.  HOW ARE DISTRIBUTIONS MADE AND TAXED?
           The Fund pays income monthly. In the opinion of bond
           counsel when each bond was issued, interest on the bonds in
           this Fund is generally 100% exempt from regular federal
           income tax.
           A portion of the income may also be exempt from state and
           local personal income taxes, depending on where you live.
 
           You will also receive principal payments if bonds are sold,
           called or mature, when the cash available is more than
           $5.00 per unit. You will be subject to tax on any gain
           realized by the Fund on the disposition of bonds.
      12.  WHAT OTHER SERVICES ARE AVAILABLE?
           REINVESTMENT
           You will receive your monthly income in cash unless you
           choose to compound your income by reinvesting with no sales
           fee in the Municipal Fund Investment Accumulation Program,
           Inc. This program is an open-end mutual fund with a
           comparable investment objective. Income from this program
           will generally be subject to state and local income taxes.
           For more complete information about the program, including
           charges and fees, ask the Trustee for the Program's
           prospectus. Read it carefully before you invest. The
           Trustee must receive your written election to reinvest at
           least 10 days before the record day of an income payment.
           EXCHANGE PRIVILEGES
           You may exchange units of this Fund for units of certain
           other Defined Asset Funds. You may also exchange into this
           Fund from certain other funds. We charge a reduced sales
           fee on exchanges.

 
                                       5
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    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS
 

<TABLE><CAPTION>
                                 EFFECTIVE
TAXABLE INCOME 1998*               % TAX                         TAX-FREE YIELD OF
  SINGLE RETURN    JOINT RETURN   BRACKET    3%     3.5%     4%     4.5%     5%     5.5%     6%     6.5%
                                                        IS EQUIVALENT TO A TAXABLE YIELD OF
- ----------------------------------------------------------------------------------------------------------
<S>              <C>                <C>       <C>    <C>      <C>    <C>     <C>    <C>      <C>    <C>      <C>
$      0- 25,350 $      0- 42,350   15.00     3.53   4.12     4.71   5.29     5.88    6.47    7.06    7.65
- ----------------------------------------------------------------------------------------------------------
$ 25,351- 61,400 $ 42,351-102,300   28.00     4.17   4.86     5.56   6.25     6.94    7.64    8.33    9.03
- ----------------------------------------------------------------------------------------------------------
$ 61,401-128,100 $102,301-155,950   31.00     4.35   5.07     5.80   6.52     7.25    7.97    8.70    9.42
- ----------------------------------------------------------------------------------------------------------
$128,101-278,450 $155,951-278,450   36.00     4.69   5.47     6.25   7.03     7.81    8.59    9.38   10.16
- ----------------------------------------------------------------------------------------------------------
OVER $278,450       OVER $278,450   39.60     4.97   5.79     6.62   7.45     8.28    9.11    9.93   10.76
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</TABLE>

 
To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 1998 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.
 
*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.
 
                                       6
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT
 
MONTHLY INCOME
 
The Fund will pay you regular monthly income. Your monthly income may vary
because of:
   o elimination of one or more bonds from the Fund's portfolio because of
     calls, redemptions or sales;
   o a change in the Fund's expenses; or
   o the failure by a bond's issuer to pay interest.
 
Changes in interest rates generally will not affect your monthly income because
the portfolio is fixed.
 
Along with your monthly income, you will receive your share of any available
bond principal.
 
RETURN FIGURES
 
We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.
 
Estimated Current Return equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):
 

 Estimated Annual                  Estimated
 Interest Income        -       Annual Expenses
- -------------------------------------------------
                   Unit Price

 
Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.
 
Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.
 
These return quotations are designed to be comparative rather than predictive.
 
RECORDS AND REPORTS
 
You will receive:
o a monthly statement of income payments and any principal payments;
o a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
  amount of tax-exempt interest received during the year.
 
You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
o audited financial statements of the Fund.
 
You may inspect records of Fund transactions at the Trustee's office during
regular business hours.
 
                                       7
<PAGE>
THE RISKS YOU FACE
 
INTEREST RATE RISK
 
Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.
 
CALL RISK
 
Many bonds can be prepaid or 'called' by the issuer before their stated
maturity.
 
For example, an issuer might call its bonds if it no longer needs the money for
the original purpose or, during periods of falling interest rates, if the
issuer's bonds have a coupon higher than current market rates. If the bonds are
called, your income will decline and you may not be able to reinvest the money
you receive at as high a yield or as long a maturity. An early call at par of a
premium bond will reduce your return.
 
REDUCED DIVERSIFICATION RISK
 
If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.
 
LIQUIDITY RISK
 
The bonds will generally trade in the over-the-counter market. We cannot assure
you that a liquid trading market will exist, especially since current law may
restrict the Fund from selling bonds to any Sponsor. The value of the bonds, and
of your investment, may be reduced if trading in bonds is limited or absent.
 
CONCENTRATION RISK
 
When a certain type of bond makes up 25% or more of the portfolio, the Fund is
said to be 'concentrated' in that bond type, which makes the Fund less
diversified.
 
Here is what you should know about the Fund's concentration in
[university/college bonds. Payment for these bonds depends on:
   o level or amount and diversity of sources of revenue;
   o availability of endowments and other funds;
   o reputation;
   o financial management;
   o enrollment; and
   o for public institutions, the financial condition of the government and its
      educational policies.
 
Here is what you should know about the Fund's concentration in hospital and
healthcare bonds.
   o payment for these bonds depends on revenues from private third-party payors
      and government programs, including Medicare and Medicaid, which have
      generally undertaken cost containment measures to limit payments to
     healthcare providers;
   o hospitals face increasing competition resulting from hospital mergers and
      affiliations;
   o hospitals need to reduce costs as HMOs increase market penetration and
     hospital supply and drug companies raise prices;
   o hospitals and health care providers are subject to various legal claims by
     patients and others and are adversely affected by increasing costs of
     insurance.
   o many hospitals are aggressively buying physician practices and assuming
     risk
 
                                       8
<PAGE>
      contracts to gain market share. If revenues do not increase accordingly,
      this practice could reduce profits;
   o Medicare is changing its reimbursement system for nursing homes. Many
     nursing home providers are not sure how they will be treated. In many
     cases, the providers may receive lower reimbursements and these would have
     to cut expenses to maintain profitability; and
   o most retirement/nursing home providers rely on entrance fees for operating
     revenues. If people live longer than expected and turnover is lower than
     budgeted, operating revenues would be adversely affected by less than
     expected entrance fees.
 
Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentration over time.
 
BOND QUALITY RISK
 
A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.
 
INSURANCE RELATED RISK
 
Some bonds may be backed by insurance companies (as shown under Portfolio).
Insurance policies generally make payments only according to a bond's original
payment schedule and do not make early payments when a bond defaults or becomes
taxable. Although the federal government does not regulate the insurance
business, various state laws and federal initiatives and tax law changes could
significantly affect the insurance business. The claims-paying ability of the
insurance companies is generally rated A or better by Standard & Poor's or
another nationally recognized rating organization. The insurance company ratings
are subject to change at any time at the discretion of the rating agencies.
 
LITIGATION AND LEGISLATION RISKS
 
We do not know of any pending litigation that might have a material adverse
effect upon the Fund.
 
Future tax legislation could affect the value of the portfolio by:
   o limiting real property taxes,
   o reducing tax rates,
   o imposing a flat or other form of tax, or
   o exempting investment income from tax.
 
SELLING OR EXCHANGING UNITS
 
You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
   o adding the value of the bonds, net accrued interest, cash and any other
     Fund assets;
   o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
     advances, cash held to buy back units or for distribution to investors and
     any other Fund liabilities; and
   o dividing the result by the number of outstanding units.
 
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.
 
SPONSORS' SECONDARY MARKET
 
While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge other than any remaining deferred sales charge.
We may resell the units to other buyers or to the Trustee. You should consult
your financial professional for current market prices to determine if other
broker-dealers or banks are offering higher prices.
 
We have maintained a secondary market continuously for over 25 years, but we
could
 
                                       9
<PAGE>
discontinue it without prior notice for any business reason.
 
SELLING UNITS TO THE TRUSTEE
 
Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.
 
Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.
 
As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.
 
If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.
 
There could be a delay in paying you for your units:
   o if the New York Stock Exchange is closed (other than customary weekend and
     holiday closings);
   o if the SEC determines that trading on the New York Stock Exchange is
     restricted or that an emergency exists making sale or evaluation of the
     bonds not reasonably practicable; and
   o for any other period permitted by SEC order.
 
EXCHANGE OPTION
 
You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 1.90%. You may exchange units of this Fund for units
of certain other funds at a reduced sales fee if your investment goals change.
To exchange units, you should talk to your financial professional about what
funds are exchangeable, suitable and currently available.
 
Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.
 
We may amend or terminate this exchange option at any time without notice.
 
HOW THE FUND WORKS
 
PRICING
 
The price of a unit includes interest accrued on the bonds, less expenses, from
the most recent Record Day up to, but not including, the settlement date, which
is usually three business days after the purchase date of the unit.
 
A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular
 
                                       10
<PAGE>
monthly income. When you sell your units you will receive your share of this
cash.
 
EVALUATIONS
 
An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.
 
INCOME
 
The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.
 
EXPENSES
 
The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
   o to reimburse the Trustee for the Fund's operating expenses;
   o for extraordinary services and costs of indemnifying the Trustee and the
     Sponsors;
   o costs of actions taken to protect the Fund and other legal fees and
     expenses;
   o expenses for keeping the Fund's registration statement current; and
   o Fund termination expenses and any governmental charges.
 
The Sponsors are currently reimbursed up to 45 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. While this
fee may exceed the amount of these costs and expenses attributable to this Fund,
the total of these fees for all Series of Defined Asset Funds will not exceed
the aggregate amount attributable to all of these Series for any calendar year.
The Fund also pays the Evaluator's fees.
 
The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.
 
The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.
 
PORTFOLIO CHANGES
 
The Sponsors and Trustee are not liable for any default or defect in a bond.
 
Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.
 
If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market
 
                                       11
<PAGE>
may not represent the same face amount of bonds that they did originally.
 
We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
   o diversity of the portfolio;
   o size of the Fund relative to its original size;
   o ratio of Fund expenses to income;
   o current and long-term returns;
   o degree to which units may be selling at a premium over par; and
   o cost of maintaining a current prospectus.
 
FUND TERMINATION
 
The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.
 
When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.
 
You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.
 
CERTIFICATES
 
Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.
 
TRUST INDENTURE
 
The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.
 
The Sponsors and the Trustee may amend the Indenture without your consent:
   o to cure ambiguities;
   o to correct or supplement any defective or inconsistent provision;
   o to make any amendment required by any governmental agency; or
   o to make other changes determined not to be materially adverse to your best
     interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.
 
The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
   o it fails to perform its duties and the Sponsors determine that its
     replacement is in your best interest; or
   o it becomes incapable of acting or bankrupt or its affairs are taken over by
     public authorities.
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee
 
                                       12
<PAGE>
without the consent of investors. The resignation or removal of either becomes
effective when a successor accepts appointment. The Sponsors will try to appoint
a successor promptly; however, if no successor has accepted within 30 days after
notice of resignation, the resigning Trustee or Evaluator may petition a court
to appoint a successor.
 
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
   o remove it and appoint a replacement Sponsor;
   o liquidate the Fund; or
   o continue to act as Trustee without a Sponsor.
 
Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.
 
The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.
 
LEGAL OPINION
 
Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.
 
AUDITORS
 
Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.
 
SPONSORS
 
The Sponsors are:
 
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
 
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
 
PRUDENTIAL SECURITIES INCORPORATED (an indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
 
Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.
 
TRUSTEE
 
The Bank of New York, 101 Barclay Street,
17 W, New York, New York 10268, is the Trustee.
 
It is supervised by the Federal Deposit Insurance Corporation, the Board of
Governors of the Federal Reserve System and New York State banking authorities.
 
UNDERWRITERS' AND SPONSORS' PROFITS
 
Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial deposit of the bonds. Any cash made
available by you to the Sponsors before the settlement date for those units may
be used in the
 
                                       13
<PAGE>
Sponsors' businesses to the extent permitted by federal law and may benefit the
Sponsors.
 
A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.
 
In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.
 
PUBLIC DISTRIBUTION
 
The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.
 
CODE OF ETHICS
 
Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.
 
YEAR 2000 ISSUES
 
Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund.
 
TAXES
 
The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances. You should
consult your own tax adviser about your particular circumstances.
 
At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and federal
alternative minimum tax. Neither we nor our counsel have reviewed the issuance
of the bonds, related proceedings or the basis for the opinions of counsel for
the issuers. We cannot assure you that the issuer (or other users) have complied
or will comply with any requirements necessary for a bond to be tax-exempt. If
any of the bonds were determined not to be tax-exempt, you could be required to
pay income tax for current and prior years, and if the Fund were to sell the
bond, it might have to sell it at a substantial discount.
 
In the opinion of our counsel, under existing law:
 
GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT
 
The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.
 
INCOME OR LOSS UPON DISPOSITION
 
When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize
 
                                       14
<PAGE>
capital gain or loss. Your gain, however, will generally be ordinary income to
the extent of any accrued 'market discount'. Generally you will have market
discount to the extent that your basis in a bond when you purchase a unit is
less than its stated redemption price at maturity (or, if it is an original
issue discount bond, the issue price increased by original issue discount that
has accrued on the bond before your purchase). You should consult your tax
adviser in this regard.
 
If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each bond for more than one year and short-term if you held
it for one year or less. If you are an individual and sell your units after
holding them for more than one year, you may be entitled to a 20% maximum
federal tax rate on any resulting gains. Consult your tax adviser in this
regard. Because the deductibility of capital losses is subject to limitations,
you may not be able to deduct all of your capital losses.
 
YOUR BASIS IN THE BONDS
 
Your aggregate basis in the bonds will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount,' 'acquisition premium' and
'bond premium'. You should consult your tax adviser in this regard.
 
EXPENSES
 
If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.
 
STATE AND LOCAL TAXES
 
Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.
 
SUPPLEMENTAL INFORMATION
 
You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolio, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.
 
                                       15


DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
  of Defined Asset Funds - Municipal Investment Trust Fund,
  Monthly Payment Series - 77:


We have audited the accompanying statement of condition of Defined
Asset Funds - Municipal Investment Trust Fund, Monthly Payment Series
- - 77, including the portfolio, as of August 31, 1998 and the related
statements of operations and of changes in net assets for the years
ended August 31, 1998, 1997 and 1996. These financial statements are
the responsibility of the Trustee. Our responsibility is to express
an opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted
auditing standards. Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. Securities owned at August
31, 1998, as shown in such portfolio, were confirmed to us by The
Bank of New York, the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the
Trustee, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Defined
Asset Funds - Municipal Investment Trust Fund, Monthly Payment Series
- - 77 at August 31, 1998 and the results of its operations and changes
in its net assets for the above-stated years in conformity with
generally accepted accounting principles.

DELOITTE & TOUCHE LLP

New York, N.Y.
November 10, 1998


                                D - 1

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

STATEMENT OF CONDITION
AS OF AUGUST 31, 1998

<TABLE>
<S>                                                <C>           <C>











TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $4,480,460)(Note 1)......................                  $5,137,872
  Securities called for redemption
   (cost 36,380) (Note 5)..........................                      50,000
  Accrued interest receivable......................                     115,817
  Cash.............................................                      20,471
                                                                   _____________

              Total trust property.................                   5,324,160

LESS LIABILITY - Accrued expenses..................                       3,747
                                                                   _____________

NET ASSETS, REPRESENTED BY:
  11,997 units of fractional undivided
    interest outstanding (Note 3)..................   $5,192,840
  Undistributed net investment income..............      127,573
                                                    _____________
                                                                     $5,320,413
                                                                   =============
UNIT VALUE ($5,320,413/11,997 units)...............                     $443.48
                                                                   =============



</TABLE>


                  See Notes to Financial Statements.



                                D - 2

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                             ........Years Ended August 31,...........
                                                 1998         1997         1996
                                             _________________________________________
<S>                                        <C>          <C>          <C>
INVESTMENT INCOME:
  Interest income...........................    $330,169     $374,217     $396,870
  Trustee's fees and expenses...............     (12,868)     (15,257)     (16,304)
  Sponsors' fees............................      (1,246)      (2,110)        (952)
                                             _________________________________________
  Net investment income.....................     316,055      356,850      379,614
                                             _________________________________________












REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Realized gain on securities sold
    or redeemed.............................     103,123       63,581       69,194
  Unrealized appreciation (depreciation)
    of investments..........................      34,010      190,882     (168,899)
                                             _________________________________________

  Net realized and unrealized gain (loss)
    on investments..........................     137,133      254,463      (99,705)
                                             _________________________________________

NET INCREASE IN NET ASSETS RESULTING
  FROM OPERATIONS...........................    $453,188     $611,313     $279,909
                                             =========================================



</TABLE>


                  See Notes to Financial Statements.



                                D - 3

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                               ........Years Ended August 31,...........
                                                   1998         1997         1996
                                               _________________________________________
<S>                                          <C>          <C>          <C>
OPERATIONS:
  Net investment income.......................  $  316,055   $  356,850   $  379,614
  Realized gain on securities sold
    or redeemed...............................     103,123       63,581       69,194
  Unrealized appreciation (depreciation)
    of investments............................      34,010      190,882     (168,899)
                                               _________________________________________
  Net increase in net assets resulting
    from operations...........................     453,188      611,313      279,909
                                               _________________________________________

DISTRIBUTIONS TO HOLDERS (Note 2):
  Income......................................    (333,080)    (361,167)    (381,788)
  Principal...................................    (781,465)    (196,340)     (88,972)
                                               _________________________________________
  Total distributions.........................  (1,114,545)    (557,507)    (470,760)











                                               _________________________________________
CAPITAL SHARE TRANSACTIONS - Redemptions of
  890, 832 and 759 units, respectively........    (431,500)    (414,558)    (375,319)
                                               _________________________________________
NET DECREASE IN NET ASSETS....................  (1,092,857)    (360,752)    (566,170)

NET ASSETS AT BEGINNING OF YEAR...............   6,413,270    6,774,024    7,340,194
                                               _________________________________________
NET ASSETS AT END OF YEAR.....................  $5,320,413   $6,413,272   $6,774,024
                                               =========================================
PER UNIT:
  Income distributions during year............      $26.69       $26.99       $26.86
                                               =========================================
  Principal distributions during year.........      $63.74       $14.85        $6.15
                                               =========================================
  Net asset value at end of year..............     $443.48      $497.65      $493.77
                                               =========================================
TRUST UNITS OUTSTANDING AT END OF YEAR........      11,997       12,887       13,719
                                               =========================================



</TABLE>


                  See Notes to Financial Statements.



                                D - 4

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

NOTES TO FINANCIAL STATEMENTS

  1.  SIGNIFICANT ACCOUNTING POLICIES

      The Fund is registered under the Investment Company Act of 1940 as
      a Unit Investment Trust. The following is a summary of significant
      accounting policies consistently followed by the Fund in the
      preparation of its financial statements. The policies are in
      conformity with generally accepted accounting principles.

      (a) Securities are stated at value as determined by the Evaluator
          based on bid side evaluations for the securities. See "How to
          Sell Units - Trustee's Redemption of Units" in this Prospectus,
          Part B.

      (b) The Fund is not subject to income taxes. Accordingly, no
          provision for such taxes is required.

      (c) Interest income is recorded as earned.












  2.  DISTRIBUTIONS

      A distribution of net investment income is made to Holders each
      month. Receipts other than interest, after deductions for
      redemptions and applicable expenses, are distributed as explained
      in "Income, Distributions and Reinvestment - Distributions" in this
      Prospectus, Part B.

  3.  NET CAPITAL
<TABLE>
<S>                                                      <C>
      Cost of 11,997 units at Date of Deposit.............   $12,201,479
      Less sales charge...................................       427,093
                                                           ______________
      Net amount applicable to Holders....................    11,774,386
      Redemptions of units - net cost of 13,003 units
        redeemed less redemption amounts..................     3,515,666
      Realized loss on securities sold or redeemed........      (582,106)
      Principal distributions.............................   (10,186,138)
      Unrealized appreciation of investments..............       671,032
                                                           ______________

      Net capital applicable to Holders...................   $ 5,192,840
                                                           ==============

</TABLE>


  4.  INCOME TAXES

      As of August 31, 1998, unrealized appreciation of investments, based
      on cost for Federal income tax purposes, (including cost of securities
      called for redemption) aggregated $671,032, all of which related to
      appreciated securities. The cost of investment securities for Federal
      income tax purposes was $4,516,840 at August 31, 1998.


                                D - 5

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

NOTES TO FINANCIAL STATEMENTS

  (5) SECURITIES CALLED FOR REDEMPTION

      $50,000 face amount of Sabine River Authority of Texas, Hydro -
      Electric Revenue Bonds, Ser. 1964 was called for redemption on
      Semptember 1, 1998. Such securities were valued at proceeds
      received.


                                D - 6












<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

PORTFOLIO
AS OF AUGUST 31, 1998
<TABLE><CAPTION>

                                           Rating                                       Optional
    Portfolio No. and Title of               of            Face                         Redemption
            Securities                     Issues(1)       Amount  Coupon Maturities(3) Provisions(3)          Cost      Value(2)
            __________                     _________       ______  ______ _____________ _____________          ____      ________
<S>                                      <C>       <C>           <C>       <C>        <C>            <C>           <C>
 1 San Francisco, California, Bay Area       AA        $   65,000  3.000%   1999       Currently         $   43,084    $   64,798
   Rapid Transit District Bonds, 1966
   Ser. E

 2 San Francisco, California, Bay Area       AA            75,000   3.000    1999       Currently            49,712        74,768
   Rapid Transit District Bonds, 1967
   Ser. G

 3 San Francisco, California, Bay Area       AA           110,000   3.000    1999       Currently            72,911       109,659
   Rapid Transit District Bonds, 1967
   Ser. H

 4 San Francisco, California, Bay Area       AA            35,000   3.000    1999       Currently            23,199        34,891
   Rapid Transit District Bonds, 1968
   Ser. J

 5 Cook County, Illinois, Public             AAA          160,000   3.250    2004       Currently           111,360       152,818
   Housing Authority Bonds

 6 City of Wichita, Kansas, Hospital         A+         1,325,000   6.750    2007       None              1,325,000     1,473,983
   Revenue Bonds, Ser. A 1977 (St.
   Francis Hospital and School of
   Nursing, Inc.)

 7 Lee County, Mississippi, Hospital         AAA          950,000   6.800    2007       None                955,985     1,056,248
   System Revenue Bonds (North
   Mississippi Medical Center Project)
   Ser. A

 8 County of Cuyahoga, Ohio, Hospital        AAA          670,000   6.750    2009       None                670,000       756,343
   Improvement First Mortgage Revenue
   Bonds (Deaconess Hospital Project)


</TABLE>

                                D - 7

<PAGE>
DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77












PORTFOLIO
AS OF AUGUST 31, 1998
<TABLE><CAPTION>

                                           Rating                                       Optional
    Portfolio No. and Title of               of            Face                         Redemption
            Securities                     Issues(1)       Amount  Coupon Maturities(3) Provisions(3)          Cost      Value(2)
            __________                     _________       ______  ______ _____________ _____________          ____      ________
<S>                                      <C>       <C>           <C>       <C>        <C>            <C>           <C>
 9 Tulsa Industrial Authority Oklahoma,      A1(m)     $   20,000   6.500%   1998       None             $   19,444    $   20,044
   First Mortgage hospital Revenue
   Bonds, Ser. 1977 (Doctors' Medical
   Center Issue)

10 South Dakota Housing Development          A+           700,000   6.000    2019       Currently           679,210       707,259
   Authority, Multi-family Housing
   Bonds, 1977 Ser. A

11 Public Utility District No. 1 of          A+           725,000   4.000    2018       03/01/99            530,555       687,061
   Douglas County, Washington, Wells                                                    @ 101.000
   Hydroelectric Revenue Bonds, Ser. of
   1963

                                                    ______________                                    ______________ ______________
TOTAL                                                  $4,835,000                                        $4,480,460     $5,137,872
                                                    ==============                                    ============== ==============


</TABLE>


                  See Notes to Portfolio.



                                D - 8

<PAGE>





DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
MONTHLY PAYMENT SERIES - 77

NOTES TO PORTFOLIO
AS OF AUGUST 31, 1998

   (1) The ratings of the bonds are by Standard & Poor's Ratings
       Group, or by Moody's Investors Service, Inc. if followed by
       "(m)", or by Fitch Investors Service, Inc. if followed by
       "(f)"; "NR" indicates that this bond is not currently rated by
       any of the above-mentioned rating services. These ratings have
       been furnished by the Evaluator but not confirmed with











       the rating agencies. A description of the rating symbols and
       their meanings appears under "Descriptions of Ratings" in this
       Prospectus, Part B.

   (2) See Notes to Financial Statements.

   (3) Optional redemption provisions, which may be exercised in whole
       or in part, are initially at prices of par plus a premium, then
       subsequently at prices declining to par. Certain securities may
       provide for redemption at par prior or in addition to any
       optional or mandatory redemption dates or maturity, for
       example, through the operation of a maintenance and replacement
       fund, if proceeds are not able to be used as contemplated, the
       project is condemned or sold or the project is destroyed and
       insurance proceeds are used to redeem the securities. Many of
       the securities are also subject to mandatory sinking fund
       redemption commencing on dates which may be prior to the date
       on which securities may be optionally redeemed. Sinking fund
       redemptions are at par and redeem only part of the issue. Some
       of the securities have mandatory sinking funds which contain
       optional provisions permitting the issuer to increase the
       principal amount of securities called on a mandatory redemption
       date. The sinking fund redemptions with optional provisions
       may, and optional refunding redemptions generally will, occur
       at times when the redeemed securities have an offering side
       evaluation which represents a premium over par. To the extent
       that the securities were acquired at a price higher than the
       redemption price, this will represent a loss of capital when
       compared with the Public Offering Price of the Units when
       acquired. Distributions will generally be reduced by the amount
       of the income which would otherwise have been paid with respect
       to redeemed securities and there will be distributed to Holders
       any principal amount and premium received on such redemption
       after satisfying any redemption requests for Units received by
       the Fund. The estimated current return may be affected by
       redemptions. The tax effect on Holders of redemptions and
       related distributions is described under "Taxes" in this
       Prospectus, Part B.

                                D - 9



<PAGE>
                             Defined
                             Asset FundsSM
 

HAVE QUESTIONS ?                         MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free             MONTHLY PAYMENT SERIES--77
Information Supplement                   (A Unit Investment Trust)
that gives more details about            ---------------------------------------
the Fund, by calling:                    This Prospectus does not contain
The Bank of New York                     complete information about the
1-800-221-7771                           investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         o Securities Act of 1933 (file no.
                                         2-59963) and
                                         o Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         Units of any future series may not be
                                         sold nor may offers to buy be accepted
                                         until that series has become effective
                                         with the Securities and Exchange
                                         Commission. No units can be sold in any
                                         State where a sale would be illegal.

 
                                                     12233--11/98
<PAGE>
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                             MONTHLY PAYMENT SERIES
                       CONTENTS OF REGISTRATION STATEMENT
 
     This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:
 
     The facing sheet of Form S-6.
 
     The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Insured
Series, 1933 Act File No. 33-54565).
 
     The Prospectus.
 
     The Signatures.
 
The following exhibits:
 
     1.1.1--Form of Standard Terms and Conditions of Trust Effective as of
            October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
            Registration Statement of Municipal Investment Trust Fund,
            Multi-state Series--48, 1933 Act File No. 33-50247).
 
     4.1  --Consent of the Evaluator.
 
     5.1  --Consent of independent accountants.
 
     9.1  --Information Supplement (incorporated by reference to Exhibit 9.1 to
            Amendment No. 4 to the Registration Statement of Municipal
        Investment Trust Fund, Insured Series--207, 1933 Act File No. 33-54037).
 
                                      R-1
<PAGE>
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                           MONTHLY PAYMENT SERIES--77
 
                                   SIGNATURES
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
DEFINED ASSET FUNDS--MUNICIPAL INVESTMENT TRUST FUND, MONTHLY PAYMENT
SERIES--77, CERTIFIES THAT IT MEETS ALL OF THE REQUIREMENTS FOR EFFECTIVENESS OF
THIS REGISTRATION STATEMENT PURSUANT TO RULE 485(B) UNDER THE SECURITIES ACT OF
1933 AND HAS DULY CAUSED THIS REGISTRATION STATEMENT OR AMENDMENT TO THE
REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO
DULY AUTHORIZED IN THE CITY OF NEW YORK AND STATE OF NEW YORK ON THE 20TH DAY OF
NOVEMBER, 1998.
 
             SIGNATURES APPEAR ON PAGES R-3, R-4, R-5, R-6 AND R-7.
 
     A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Prudential
Securities Incorporated has signed this Registration Statement or Amendment to
the Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.
 
                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              Numbers: 33-43466 and 33-51607

 
      HERBERT M. ALLISON, JR.
      JOHN L. STEFFENS
      By ERNEST V. FABIO
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)
 
                                      R-3
<PAGE>
                       PRUDENTIAL SECURITIES INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Prudential Securities             have been filed
  Incorporated:                                               under Form SE and
                                                              the following 1933
                                                              Act File Numbers:
                                                              33-41631 and
                                                              333-15919

 
      ROBERT C. GOLDEN
      ALAN D. HOGAN
      A. LAURENCE NORTON, JR.
      LELAND B. PATON
      VINCENT T. PICA II
      MARTIN PFINSGRAFF
      HARDWICK SIMMONS
      LEE B. SPENCER, JR.
      BRIAN M. STORMS
 
      By RICHARD R. HOFFMANN
       (As authorized signatory for Prudential Securities
       Incorporated and Attorney-in-fact for the persons
       listed above)
 
                                      R-4
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085 and
  Reynolds Inc.:                            333-13039

 
      RICHARD M. DeMARTINI
      ROBERT J. DWYER
      CHRISTINE A. EDWARDS
      JAMES F. HIGGINS
      MITCHELL M. MERIN
      STEPHEN R. MILLER
      RICHARD F. POWERS III
      PHILIP J. PURCELL
      THOMAS C. SCHNEIDER
      WILLIAM B. SMITH
      By
       MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)
 
                                      R-5

<PAGE>
                                                                     EXHIBIT 4.1
 
                               STANDARD & POOR'S
                    A DIVISION OF THE McGRAW-HILL COMPANIES
                                  J. J. KENNY
                                  65 BROADWAY
                           NEW YORK, N.Y. 10006-2551
                            TELEPHONE (212) 770-4422
                                FAX 212/797-8681
 
                                                   November 20, 1998
 
Frank A. Ciccotto, Jr.
Vice President
Tax-Exempt Evaluations
 

Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051
The Bank of New York
101 Barclay Street
New York, New York 10286

 
RE: DEFINED ASSET FUNDS--MUNICIPAL INVESTMENT TRUST FUND,
     MONTHLY PAYMENT SERIES--77
 
Gentlemen:
 
     We have examined the post-effective Amendment to the Registration Statement
File No. 2-59963 for the above-captioned trust. We hereby acknowledge that Kenny
S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently acting
as the evaluator for the trust. We hereby consent to the use in the Amendment of
the reference to Kenny S&P Evaluation Services, a division of J. J. Kenny Co.,
Inc. as evaluator.
 
     In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in our
KENNYBASE database.
 
     You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.
 
                                                   Sincerely,
                                                   FRANK A. CICCOTTO
                                                   Vice President

<PAGE>
                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS
The Sponsors and Trustee of
Defined Asset Funds--Municipal Investment Trust Fund--Monthly Payment Series--77
 
We consent to the use in this Post-Effective Amendment No. 21 to Registration
Statement No. 2-59963 of our opinion dated November 10, 1998 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading 'Miscellaneous--Auditors' in such Prospectus.
 
DELOITTE & TOUCHE LLP
New York, N.Y.
November 20, 1998

<TABLE> <S> <C>



<ARTICLE> 6
<MULTIPLIER>1

       
<S>                                       <C>
<PERIOD-TYPE>                             YEAR
<FISCAL-YEAR-END>                                                   Aug-31-1998
<PERIOD-END>                                                        Aug-31-1998

<INVESTMENTS-AT-COST>                                                4,516,840
<INVESTMENTS-AT-VALUE>                                               5,187,872
<RECEIVABLES>                                                          165,817
<ASSETS-OTHER>                                                          20,471
<OTHER-ITEMS-ASSETS>                                                         0
<TOTAL-ASSETS>                                                       5,374,160
<PAYABLE-FOR-SECURITIES>                                                     0
<SENIOR-LONG-TERM-DEBT>                                                      0
<OTHER-ITEMS-LIABILITIES>                                                3,747
<TOTAL-LIABILITIES>                                                      3,747
<SENIOR-EQUITY>                                                              0
<PAID-IN-CAPITAL-COMMON>                                             4,521,808
<SHARES-COMMON-STOCK>                                                   11,997
<SHARES-COMMON-PRIOR>                                                   12,887
<ACCUMULATED-NII-CURRENT>                                              127,573
<OVERDISTRIBUTION-NII>                                                       0
<ACCUMULATED-NET-GAINS>                                                      0
<OVERDISTRIBUTION-GAINS>                                                     0
<ACCUM-APPREC-OR-DEPREC>                                               671,032
<NET-ASSETS>                                                         5,370,413
<DIVIDEND-INCOME>                                                            0
<INTEREST-INCOME>                                                      330,169
<OTHER-INCOME>                                                               0
<EXPENSES-NET>                                                         (14,114)
<NET-INVESTMENT-INCOME>                                                316,055
<REALIZED-GAINS-CURRENT>                                               103,123
<APPREC-INCREASE-CURRENT>                                               34,010
<NET-CHANGE-FROM-OPS>                                                  453,188
<EQUALIZATION>                                                               0
<DISTRIBUTIONS-OF-INCOME>                                              333,080
<DISTRIBUTIONS-OF-GAINS>                                                     0
<DISTRIBUTIONS-OTHER>                                                  781,465
<NUMBER-OF-SHARES-SOLD>                                                      0
<NUMBER-OF-SHARES-REDEEMED>                                                890
<SHARES-REINVESTED>                                                          0
<NET-CHANGE-IN-ASSETS>                                              (1,092,857)
<ACCUMULATED-NII-PRIOR>                                                153,948
<ACCUMULATED-GAINS-PRIOR>                                                    0
<OVERDISTRIB-NII-PRIOR>                                                      0
<OVERDIST-NET-GAINS-PRIOR>                                                   0
<GROSS-ADVISORY-FEES>                                                        0
<INTEREST-EXPENSE>                                                           0
<GROSS-EXPENSE>                                                              0
<AVERAGE-NET-ASSETS>                                                         0
<PER-SHARE-NAV-BEGIN>                                                        0
<PER-SHARE-NII>                                                              0
<PER-SHARE-GAIN-APPREC>                                                      0
<PER-SHARE-DIVIDEND>                                                         0
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<PER-SHARE-NAV-END>                                                          0
<EXPENSE-RATIO>                                                              0
<AVG-DEBT-OUTSTANDING>                                                       0
<AVG-DEBT-PER-SHARE>                                                         0
        

</TABLE>


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