Document:

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                                                                 Exhibit 4.1.2.1

                           TRUMP CASINO HOLDINGS, LLC,
                           TRUMP CASINO FUNDING, INC.,
                                   as Issuers

                 17-5/8% Second Priority Mortgage Notes due 2010

                      ------------------------------------

                          FIRST SUPPLEMENTAL INDENTURE
                           Dated as of June 12, 2003

                                       to

                                    INDENTURE

                           Dated as of March 25, 2003

                      ------------------------------------

                         U.S. BANK NATIONAL ASSOCIATION,
                                   as Trustee

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                  FIRST SUPPLEMENTAL INDENTURE, dated as of June 12, 2003 (this
"First Supplemental Indenture"), among TRUMP CASINO HOLDINGS, LLC, a Delaware
limited liability company (the "Company") and TRUMP CASINO FUNDING, INC., a
Delaware corporation ("TC Funding" and together with the Company, the "Issuers")
and U.S. BANK NATIONAL ASSOCIATION, a national banking association, as trustee
(the "Trustee").

                              W I T N E S S E T H:

                  WHEREAS, the Issuers, the guarantors named therein and the
Trustee have heretofore executed and delivered an indenture, dated as of March
25, 2003 (the "Indenture"), governing the 17-5/8% Second Priority Mortgage Notes
due 2010 of the Issuers (the "Notes");

                  WHEREAS, Sections 9.01(a) and 9.01(e) of the Indenture provide
that the Issuers and the Trustee may amend or supplement the Indenture without
the consent of any Holder to cure any defect in the Indenture or to make any
change to the Indenture that would provide any additional rights or benefits to
the Holders or that does not adversely affect the rights thereunder of any
Holder; and

                  WHEREAS, all conditions precedent provided for in Section 9.01
of the Indenture with respect to the execution of this First Supplemental
Indenture have been complied with.

                  NOW THEREFORE, in consideration of the foregoing premises, the
Issuers and the Trustee agree as follows:

                  Section 1. Definitions. All capitalized terms used herein and
not defined are used herein as defined in the Indenture.

                  Section 2. Amendment to the Indenture. The Indenture is hereby
amended by deleting the text of Section 4.07(a)(2) in its entirety and replacing
it with the following: "the Total Leverage Ratio of the Company is greater than
4.0 to 1.0; or".

                  Section 3. Ratification. Except as hereby expressly amended,
the Indenture is in all respects ratified and confirmed and all the terms,
provisions and conditions thereof shall be and remain in full force and effect.

                  Section 4. Conflict with Trust Indenture Act. If and to the
extent that any provision of this First Supplemental Indenture limits, qualifies
or conflicts with any provision which is required or deemed to be included in
this First Supplemental Indenture by any of the provisions of the Trust
Indenture Act of 1939, such required or deemed provision shall control.

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                                      -2-

                  Section 5. Separability Clause. In case any provision in this
First Supplemental Indenture shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby.

                  Section 6. Effect of Headings. The section headings herein are
for convenience only and shall not affect the construction hereof.

                  Section 7. Benefits of this First Supplemental Indenture.
Nothing in this First Supplemental Indenture, express or implied, shall give to
any person, other than the parties to the Indenture and their respective
successors thereunder and the Holders, any benefit or any legal or equitable
right, remedy or claim under this First Supplemental Indenture.

                  Section 8. Successors and Assigns. All covenants and
agreements in this First Supplemental Indenture by the Issuers shall bind their
respective successors and assigns, whether so expressed or not.

                  Section 9. Governing Law. This First Supplemental Indenture
and the Indenture and the Notes, each as supplemented and amended hereby, shall
be governed by, and construed in accordance with, the laws of the State of New
York but without giving effect to applicable principles of conflicts of law to
the extent that the application of the laws of another jurisdiction would be
required thereby.

                  Section 10. Multiple Originals. The parties may sign any
number of copies of this First Supplemental Indenture. Each signed copy shall be
an original, but all of them together represent the same agreement. One signed
copy is enough to prove this First Supplemental Indenture.

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                                      -3-

                  IN WITNESS WHEREOF, the Issuers and the Trustee have caused
this First Supplemental Indenture to be duly executed as of the date first above
written.

                                              ISSUERS:

                                              TRUMP CASINO HOLDINGS, LLC

                                              By: /s/ John P. Burke
                                                 ---------------------------
                                                 Name:  John P. Burke
                                                 Title: Executive Vice President

                                              TRUMP CASINO FUNDING, INC.

                                              By: /s/ John P. Burke
                                                 ---------------------------
                                                 Name:  John P. Burke
                                                 Title: Executive Vice President

                                              TRUSTEE:

                                              U.S. BANK NATIONAL ASSOCIATION

                                              By: /s/ Richard H. Prokosch
                                                 ---------------------------
                                                 Name:  Richard H. Prokosch
                                                 Title: Vice PresidentConvertible Note

 EXHIBIT 4.1 
  
 THIS DEBENTURE AND THE SHARES INTO WHICH THIS DEBENTURE MAY BE CONVERTED ARE SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH
HEREIN 
  
 CONVERTIBLE DEBENTURE 
  

	 Convertible Debenture Number:
	  	#CD 02-001
	 	  	 
	 Date:
	  	December 31, 2002
	 	  	 
	 Registered Holder:
	  	Avalanche Resources, Ltd.
	 	  	8 Saddlewood Estates
	 	  	Houston, Texas 77024

  
 1.    Payment.    For value received, North American Technologies Group, Inc., a Delaware corporation (the “Corporation”), promises to pay to the Registered Holder, or the Registered
Holder’s registered assigns (“Holder”), according to the terms of payment stated below, the Principal Amount plus interest at the rates and on the date stated below. 
  
 2.    Principal Amount.    $2,000,000.00. 
  
 3.    Interest Rates. 
  
 (a)    Annual Interest Rate on Unpaid
Principal from Date of Receipt of Funds for this Debenture: 10% 
  
 (b)    Annual Interest Rate on Matured, Unpaid Amounts: 18% 
  
 4.    Terms of Payment.    Interest only is due and payable monthly as it accrues on the last day of
each month, beginning January 31, 2003 and continuing through January 31, 2004. At that time the unpaid principal balance and accrued, unpaid interest will be payable in full. Payments will be applied first to accrued interest and the remainder to
reduction of the Principal Amount. 
  
 5.    Prepayment.    This Debenture may be prepaid in full or in part at any time, without penalty or premium, except that the Corporation shall give Holder written notice of its intent to
prepay at least ninety days prior to the prepayment date, specifying such prepayment date and the principal amount of this Debenture to be prepaid on such date. Holder’s right to convert this Debenture into shares of common stock of the
Corporation as provided below shall expire upon the payment of this Debenture in full, either as originally scheduled or pursuant to the Corporation’s prepayment right. 

 6.    Conversion. 
  
 (a)    At the option of Holder all or any
part of the principal or interest, or both, owed under this Debenture is convertible in whole at any time or in part from time to time on any business day during the period (the “Conversion Period”) beginning on January 1, 2004 and ending
on January 31, 2004 at 5:00 p.m., Houston, Texas time, into shares (“Shares”) of common stock of the Corporation, par value $.001 each (“Common Stock”), at the Conversion Price (defined below). 
  
 (b)    The conversion right may be
exercised only by the surrender of this Debenture at the principal office of the Corporation or that of the transfer agent for the Common Stock during the Conversion Period, together with the executed conversion form (attached hereto). The principal
office of the Corporation is located at the address specified on the signature page of this Debenture; provided, however, that the Corporation may change its principal office upon notice to Holder. Upon the partial conversion of this Debenture, the
Corporation shall issue to Holder a new Debenture of like tenor and date reflecting the partial conversion of this Debenture. This Debenture is not exercisable with respect to a fraction of a Share. In lieu of issuing a fraction of a Share remaining
after the conversion of this Debenture as to all full Shares covered by this Debenture, the Corporation shall pay for the fractional Share cash equal to the same fraction at the Conversion Price for such Share. 
  
 (c)    The Conversion Price is the lower
of: (i) $.60 per Share; or (ii) the lowest price (but not less than $.50 per Share) for which the Corporation issues shares of Common Stock at any time during 2003, except pursuant to the conversion of this Debenture or the exercise of the Warrant
of even date herewith issued to the Registered Holder relating to 2,000,000 shares of Common Stock. 
  
 (d)    The Corporation represents and covenants that Shares deliverable on conversion shall at delivery be fully paid
and nonassessable, free from taxes, liens and charges with respect to their purchase. 
  
 7.    Adjustment of Conversion Price. 
  
 (a)    The Conversion Price shall be adjusted as provided in paragraph 7(b) if at any time or from time to time after
the date of this Debenture, any of the following events occurs: 
  
 (i)    the Corporation distributes shares of Common Stock as a dividend with respect to its outstanding shares of capital stock; 
  
 (ii)    subdivides its outstanding shares of Common Stock into a larger number of
shares; or 
  
 (iii)    combines its outstanding shares of Common Stock into a smaller number of shares. 

 (b)    Upon the occurrence of any event described in paragraph 7(a),
the Conversion Price shall be adjusted to that price determined by multiplying the Conversion Price in effect immediately prior to such event by a fraction, the numerator of which is the total number of outstanding shares of Common Stock immediately
prior to such event and the denominator of which is the total number of outstanding shares of Common Stock immediately after such event. 
  
   8.    Dissolution.    In case a voluntary or involuntary dissolution or winding up of the
Corporation (other than in connection with a consolidation or merger covered by paragraph 9 below) is at any time proposed during the term of this Debenture, the Corporation shall give at least ninety days’ prior written notice to Holder. Such
notice shall contain: (a) the date on which the transaction is to take place; (b) the record date (which shall be at least ninety days after the giving of the notice) as of which holders of Common Stock of the Corporation will be entitled to receive
distributions as a result of the transaction; (c) a brief description of the transaction; (d) a brief description of the distributions to be made to holders of Common Stock as a result of the transaction; and (e) an estimate of the fair value of the
distributions. 
  
   9.    Merger/Consolidation.    If the Corporation consolidates with or merges into another corporation, Holder shall thereafter be entitled to purchase on conversion of this
Debenture, with respect to each Share into which this Debenture may be converted immediately before the consolidation or merger becomes effective, the securities or other consideration to which a holder of one share of Common Stock of the
Corporation is entitled in the consolidation or merger without any change in or payment in addition to the aggregate Conversion Price for all such Shares in effect immediately prior to the merger or consolidation. A sale or lease of all or
substantially all the assets of the Corporation for a consideration (apart from the assumption of obligations) consisting primarily of securities is a consolidation or merger for the foregoing purposes. The Conversion Price for the shares of the
successor shall be proportionately adjusted consistent with such conversion ratio. The Corporation shall provide Holder written notice of such merger or consolidation at least thirty days prior to the effective date thereof. Upon the effective date
of such merger or consolidation the term “Corporation” hereunder shall refer to Corporation’s successor. 
  
 10.    Notice of Adjustment.    On the occurrence of an event requiring an adjustment of the Conversion
Price or the Shares purchasable under this Debenture, the Corporation shall give written notice to Holder stating the adjusted Conversion Price and the adjusted number and kind of securities or other property purchasable under this Debenture
resulting from the event and setting forth in reasonable detail the method of calculation and the facts upon which the calculation is based. 
  
 11.    Rights of Holder.    This Debenture does not entitle Holder to any voting rights or any other rights
as a shareholder of the Corporation. No dividends are payable or will accrue on this Debenture or the Shares purchasable under this Debenture until, and except to the extent that, this Debenture is converted. Upon the surrender of this Debenture for
conversion, Holder shall be treated as the record holder of such Shares as of the close of business on the date of the surrender of this Debenture for conversion. 

 12.    Transfer. 
  
 (a)    NEITHER THIS DEBENTURE NOR ANY SECURITIES INTO WHICH THIS DEBENTURE MAY BE
CONVERTED HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. THIS DEBENTURE HAS BEEN TAKEN BY THE REGISTERED OWNER FOR INVESTMENT, AND WITHOUT A VIEW TO RESALE OR DISTRIBUTION THEREOF, AND MAY NOT BE TRANSFERRED OR DISPOSED OF
WITHOUT AN OPINION OF COUNSEL SATISFACTORY TO THE CORPORATION THAT SUCH TRANSFER OR DISPOSITION DOES NOT VIOLATE THE SECURITIES ACT OF 1933, AS AMENDED, OR THE RULES AND REGULATIONS THEREUNDER OR THE SECURITIES LAWS OF ANY STATE. 
  
 (b)    No Shares may be transferred or
disposed of without an opinion of counsel satisfactory to the Corporation that such transfer does not violate the Securities Act of 1933, as amended, or the rules and regulations thereunder, or the securities laws of any state. All certificates
evidencing any Shares shall bear the following legend, in addition to any other legend required by law or otherwise: 
  
 “THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. THE SECURITIES REPRESENTED BY
THIS CERTIFICATE HAVE BEEN TAKEN BY THE REGISTERED OWNER FOR INVESTMENT, AND WITHOUT A VIEW TO RESALE OR DISTRIBUTION THEREOF, AND MAY NOT BE TRANSFERRED OR DISPOSED OF WITHOUT AN OPINION OF COUNSEL SATISFACTORY TO THE ISSUER THAT SUCH TRANSFER OR
DISPOSITION DOES NOT VIOLATE THE SECURITIES ACT OF 1933, AS AMENDED, OR THE RULES AND REGULATIONS THEREUNDER OR THE LAWS OF ANY STATE.” 
  
 (c)    Subject to the foregoing, this Debenture is transferable only on surrender of this Debenture to the Corporation
with an assignment of this Debenture (in a form reasonably acceptable to the Corporation) duly executed by Holder. 
  
 13.    Default.    If the Corporation defaults in the payment of this Debenture or in the performance of
any obligation in any instrument securing or collateral to it, and such default continues for a period of twenty days after notice to the Corporation, Holder may declare the unpaid principal balance and earned interest on this Debenture immediately
due. Subject to the preceding sentence, the Corporation waives all demands for payment, presentations for payment, notices of intention to accelerate maturity, notices of acceleration of maturity, protests, and notices of protest. 
  
 14.    Security
Agreement.    This Debenture is secured by a Security Agreement dated the same date as this Debenture and executed by the Corporation (and other entities) as debtor and the Registered Holder as secured party. 

 15.    Maximum Rate.    Interest on the debt evidenced by
this Debenture shall not exceed the maximum amount of nonusurious interest that may be contracted for, taken, reserved, charged or received under law; any interest in excess of that maximum amount shall be credited on the principal of the debt or,
if that has been paid, refunded. On any acceleration or required or permitted prepayment, any such excess shall be canceled automatically as of the acceleration or prepayment or, if already paid, credited on the principal of the debt or, if the
principal of the debt has been paid, refunded. This provision overrides other provisions in this and all other instruments concerning the debt. 
  
 16.    Substitution.    The Corporation will issue and deliver a new Debenture of like tenor to Holder upon
receipt by the Corporation of evidence reasonably satisfactory to the Corporation of the ownership of and the loss, theft or destruction or mutilation of this Debenture, and (in the case or loss, theft or destruction) of an indemnity reasonably
satisfactory to the Corporation, and (in the case of mutilation) upon the surrender and cancellation of this Debenture. 
  
 17.    Attorney Fees.    The prevailing party in any suit brought to enforce or interpret this Debenture
shall be entitled to recover reasonable attorneys fees and court and other costs in addition to any other relief awarded. 
  
 18.    Applicable Law.    THIS NOTE SHALL BE GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF TEXAS,
EXCLUDING CONFLICTS-OF-LAW PROVISIONS THEREOF. 
  
 19.    Notices.    Any notice required or permitted to be sent hereunder shall be effective when: (a) actually delivered, or (b) whether or not actually received, when deposited in the United
States mail, postage prepaid, certified mail, return receipt requested, and addressed in the case of the Corporation, to the Corporation’s principal office, Attention: The President, and addressed in the case of Holder, to Holder’s last
known address as shown on the books and records of the Corporation. Each party may change its address for notice by notice to the other parties. 
  
 20.    Miscellaneous.    This Debenture may not be amended except by an instrument in writing signed by the
Corporation and Holder. 
  

	NORTH AMERICAN TECHNOLOGIES
		
	 	 	 
	 	 	 

 14315 West Hardy Road 
 Houston, TX 77060 
 ATTENTION: The President 

	 
		
	 By:
	 	 /s/    Henry W. Sullivan

	 	 	 Henry W. Sullivan, President

 CONVERSION FORM 
  

(To be executed by Holder to convert this Debenture) 
  
 The undersigned hereby irrevocably: 
  
 (1)    Requests conversion of the following amount owed under this Debenture into Shares of Common Stock of North American
Technologies Group, Inc.: 
  
 (    )    All principal and interest owed under this Debenture. 
  
 (    )    Principal of
$                                        .

  
 (    )    Interest of
$                                        
    . 
  
 [Mark applicable action(s)]

  
 (2)    Requests issuance and delivery of a
certificate(s) for the Shares purchasable upon the foregoing conversion. 
  
 (3)    Requests issuance and delivery of a new Debenture for any unpaid principal or interest owed under this Debenture that is not converted. 
  

	 	 	 	 	 
					
	 	 	
	 	 	 	 	 	

	 	 	 Date
	 	 	 	 	 	 Holder’s Signature

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