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                                                                   EXHIBIT 10.77

                            CERTIFICATE OF AMENDMENT
                                       OF
                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                        INTEGRATED SECURITY SYSTEMS, INC.

         Integrated Security Systems, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), does hereby certify that:

         FIRST: The name of the Corporation is Integrated Security Systems, Inc.

         SECOND: The Board of Directors of the Corporation, by the unanimous
written consent of its members, adopted a resolution proposing and declaring
advisable that the number of authorized shares of the Corporation's Common
Stock, par value $.01 per share, be increased from 30,000,000 shares to
35,000,000 by adopting the following amendment to the Restated Certificate of
Incorporation of the Corporation:

                  Article FOURTH shall be amended in its entirety as follows:

                  "FOURTH: The total number of shares of stock which the
         Corporation shall have authority to issue is 35,750,000 shares, of
         which 35,000,000 shares shall be Common Stock, par value $.01 per share
         ("Common Stock"), and 750,000 shares shall be Preferred Stock, par
         value $.01 per share ("Preferred Stock")."

         THIRD: The resolution adopted by the Board of Directors has been duly
adopted by vote of the holders of a majority of the outstanding Common Stock at
a Special Meeting of Stockholders called and held in accordance with the
provisions of Sections 211 and 222 of the General Corporation Law of the State
of Delaware, as an amendment to the Restated Certificate of Incorporation of the
Corporation.

         FOURTH: The aforesaid amendment was duly adopted in accordance with the
applicable provisions of Section 242 of the General Corporation Law of the State
of Delaware.

         IN WITNESS WHEREOF, Integrated Security Systems, Inc. has caused this
certificate to be signed by its President and attested to by its Secretary, as
of December 17, 1999.

                                        INTEGRATED SECURITY SYSTEMS, INC.

                                        By:
                                            ------------------------------------
                                            Gerald K. Beckmann
                                            President<PAGE>   1
                                                                    EXHIBIT 10.2

                     FIRST AMENDMENT TO AMENDED AND RESTATED
                           LOAN AND SECURITY AGREEMENT

                  This First Amendment to Amended and Restated Loan and Security
Agreement ("Amendment") is entered into as of December 10, 1999, by and among
FOOTHILL CAPITAL CORPORATION, a California corporation ("Foothill"), on the one
hand, and NATIONAL AMERICAN CORPORATION, a Nevada corporation ("NAC"), THOUSAND
TRAILS, INC., a Delaware corporation ("Trails"), and the party borrowers
signatory hereto: (each, individually and collectively, jointly and severally, a
"Borrower"), with their chief executive office located at 2711 LBJ Freeway,
Suite 200, Dallas, Texas, 75234, and is made with reference to the following
facts:

                                 R E C I T A L S

                  FACT ONE: On or about December 10, 1999, Borrowers and
Foothill entered into that certain Amended and Restated Loan and Security
Agreement dated as of December 10, 1999 (the "Loan Agreement").

                  FACT TWO: Pursuant to the terms of the Loan Agreement,
Borrower utilized borrowings from Foothill to acquire all of the issued and
outstanding shares of stock of Albertsen Investment Corporation, a Washington
corporation ("AIC"), and will use future borrowers to aid in the conduct of such
business.

                  FACT THREE: One of the assets of AIC is its ownership of all
of the issued and outstanding shares of stock of Leisure Time Resorts of
America, Inc., a Washington corporation ("Leisure Time").

                  FACT FOUR: Borrowers and Foothill desire that AIC and Leisure
Time shall each become a borrower under the Loan Agreement and the Loan
Documents (as defined in the Loan Agreement).

                  FACT FIVE: Borrowers, AIC and Leisure Time desire to amend the
Loan Agreement to add AIC and Leisure Time as Borrowers thereunder.

                                A G R E E M E N T

                  NOW, THEREFORE, Borrowers and Foothill hereby amend the Loan
Agreement as follows:

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     1. DEFINITIONS. All initially capitalized terms used in this Amendment
shall have the meanings given to them in the Loan Agreement unless specifically
defined herein.

     2. AMENDMENT. All references in the Loan Agreement and the Loan Documents
to "Borrower" or "Borrowers" is amended as of the date hereof to additionally
include, on a joint and several basis, Albertsen Investment Corporation and
Leisure Time Resorts of America, Inc.

     3. REPRESENTATIONS AND WARRANTIES. Borrower hereby affirms to Foothill that
all of Borrower's representations and warranties set forth in the Loan Agreement
are true, complete and accurate in all material respects as of the date hereof.

     4. NO DEFAULTS. Borrower hereby affirms to Foothill that no Event of
Default has occurred and is continuing as of the date hereof.

     5. CONDITION PRECEDENT. The effectiveness of this Amendment is expressly
conditioned upon receipt by Foothill of an executed copy of this Amendment.

     6. COUNTERPARTS; EFFECTIVENESS. This Amendment may be executed in any
number of counterparts and by different parties on separate counterparts, each
of which when so executed and delivered shall be deemed to be an original. All
such counterparts, taken together, shall constitute but one and the same
Amendment. This Amendment shall become effective upon the execution of a
counterpart of this Amendment by each of the parties hereto.

        IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date first set forth above.

                                            "FOOTHILL"

                                            FOOTHILL CAPITAL CORPORATION,
                                            a California corporation

                                            By: /s/ Katy J. Brooks
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            "BORROWERS"

                                            ALBERTSEN INVESTMENT CORPORATION,
                                            a Washington corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            LEISURE TIME RESORTS OF AMERICA,
                                            INC., a Washington corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            NATIONAL AMERICAN CORPORATION,
                                            a Nevada corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            THOUSAND TRAILS, INC.,
                                            a Delaware corporation,
                                            f/k/a USTrails, Inc., a Nevada
                                            corporation, and New Thousand
                                            Trails, Inc., a Delaware corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            THOUSAND TRAILS (CANADA) INC.,
                                            a British Columbian corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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<PAGE>   4

                                            TT OFFSHORE, LTD.,
                                            a Virginia corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            BEECH MOUNTAIN LAKES CORPORATION,
                                            a Pennsylvania corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            CAROLINA LANDING CORPORATION,
                                            a South Carolina corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            CARRIAGE MANOR CORPORATION,
                                            a North Carolina corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            CHEROKEE LANDING CORPORATION,
                                            a Tennessee corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            CHIEF CREEK CORPORATION,
                                            a Tennessee corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            COAST FINANCIAL SERVICES, INC.,
                                            a Delaware corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            DIXIE RESORT CORPORATION,
                                            a Mississippi corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            FOXWOOD CORPORATION,
                                            a South Carolina corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            GL LAND DEVELOPMENT CORPORATION,
                                            an Oklahoma corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            LAKE ROYALE CORPORATION,
                                            a North Carolina corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            LAKE TANSI VILLAGE, INC.,
                                            a Tennessee corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            LML RESORT CORPORATION,
                                            an Alabama corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            NATCHEZ TRACE WILDERNESS PRESERVE
                                            CORPORATION, a Tennessee corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            OWC ACQUISITION CORP.,
                                            a Delaware corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            QUAIL HOLLOW PLANTATION
                                            CORPORATION, a Tennessee
                                            corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            QUAIL HOLLOW VILLAGE, INC.,
                                            a Pennsylvania corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            RECREATION LAND CORPORATION,
                                            a Pennsylvania corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            RECREATION PROPERTIES, INC.,
                                            a Mississippi corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            RESORT LAND CORPORATION,
                                            an Arkansas corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            RESORT PARKS INTERNATIONAL, INC.,
                                            f/k/a Shorewood Corporation,
                                            a Georgia corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            TANSI RESORT, INC.,
                                            a Tennessee corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            THE KINSTON CORPORATION,
                                            a South Carolina corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            THE VILLAS OF HICKORY HILLS, INC.,
                                            a Mississippi corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            WESTERN FUN CORPORATION,
                                            a Texas corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            WESTWIND MANOR CORPORATION,
                                            a Texas corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

                                            WOLF RUN MANOR CORPORATION,
                                            a Pennsylvania corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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                                            UST WILDERNESS MANAGEMENT
                                            CORPORATION, a Nevada corporation

                                            By: /s/ Walter B. Jaccard
                                               ---------------------------------
                                            Title: Vice President
                                                  ------------------------------

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