EXHIBIT 4.3(b)












                                                CINEMARK USA, INC.

                                                        and

                                               THE BANK OF NEW YORK,
                                                    successor to
                                        NATIONSBANK OF TEXAS, N.A., Trustee

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

                                           First Supplemental Indenture

                                            Dated as of August 9, 1996

                                                        to

                                                     Indenture

                                             Dated as of June 10, 1992
                                               --------------------

                                                   $125,000,000


                                         12% Senior Notes due June 1, 2002












                                           FIRST SUPPLEMENTAL INDENTURE

         THIS FIRST  SUPPLEMENTAL  INDENTURE  (this  "Supplemental  Indenture"),
dated as of August 9, 1996, is between  Cinemark USA, Inc., a Texas  corporation
(the  "Company"),  and The Bank of New York,  successor to NationsBank of Texas,
N.A.,  as trustee (the  "Trustee").  All  capitalized  terms  contained  but not
defined  herein  shall  have the  respective  meanings  assigned  to them in the
Indenture (as defined below),  as such Indenture is amended by this Supplemental
Indenture.

                                                     RECITALS

     A. The Company and the Trustee executed an indenture,  dated as of June 10,
1992 (the "Indenture"),  relating to the Company's $125 million principal amount
12% Senior Notes due June 1, 2002 (the "Securities").

     B. Section 9.02 of the Indenture  provides that the Company and the Trustee
may amend the  Indenture  with the written  consent of the Holders of at least a
majority  of the  aggregate  principal  amount  of the  Securities  at the  time
outstanding.

     C. The Company desires to amend certain provisions of the Indenture, as set
forth in Article One hereof.

     D. The Company has received and accepted written consents of Holders to the
amendments  set forth in this  Supplemental  Indenture (the  "Consents"),  which
Consents  have not been  subsequently  revoked,  from the  Holders of at least a
majority of the aggregate principal amount of the Securities outstanding.

     E. All conditions  precedent provided for in the Indenture relating to this
Supplemental Indenture have been complied with.

         NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH, for and
in  consideration  of the  above  premises  and  for  other  good  and  valuable
consideration,  the receipt and sufficiency of which is hereby acknowledged, the
Company  and  the  Trustee  mutually  covenant  and  agree  for  the  equal  and
proportionate benefit of all Holders of the Securities as follows:

                                                    ARTICLE ONE

                                              Amendment of Indenture

         Section 1.01 Waiver of Indenture  Provisions.  The  application  of the
provisions  of Sections  4.06 through and  including  4.23 of the  Indenture are
hereby waived to the extent that such provisions might otherwise  interfere with
the  ability of the  Company to enter into  agreements  contemplated  by, and to
consummate, the repurchase offer and the consent solicitation for

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Securities  (the  "Repurchase  Offer"),  as set forth in the Company's  Offer to
Purchase and Consent  Solicitation  and the  accompanying  Consent and Letter of
Transmittal,  each dated July 15, 1996,  and any  amendments,  modifications  or
supplements thereto (the "Offer to Purchase").

         Section 1.02 Amendment of Indenture Provisions. Effective upon the date
of the  Company's  deposit  with The Bank of New  York,  as  depositary  for the
Repurchase  Offer, of an amount of money sufficient to repurchase all Securities
validly tendered and accepted pursuant to the Offer to Purchase:

                  (i)  Section  1.01 of  Article  1 of the  Indenture  is hereby
         amended by deleting the following definitions in their entirety:


                  "Acquired Indebtedness"
                  "Asset Disposition"
                  "Capitalized Lease Obligations"
                  "Change of Control"
                  "Consolidated EBITDA"
                  "Consolidated Interest Expense"
                  "Consolidated Net Income"
                  "Consolidated Net Worth"
                  "EBITDA Ratio"
                  "Independent Director"
                  "Interest Rate Protection Agreement"
                  "Investment"
                  "Net Proceeds"
                  "Offer"
                  "Offer Purchase Date"
                  "Permitted Investment"
                  "Purchase Money Obligation"
                  "Restricted Subsidiary"
                  "Subsidiary"
                  "Trade Payables"
                  "Unrestricted Subsidiary"
                  "Weighted Average Life"
                  "Wholly Owned Subsidiary"


                  (ii) Sections 4.06,  4.07, 4.08, 4.09, 4.10, 4.11, 4.12, 4.13,
         4.14,  4.15,  4.16,  4.17, 4.18, 4.19, 4.20, 4.21, 4.22, 4.23, and 5.01
         are hereby  amended by deleting all such  sections  and all  references
         thereto in their entirety.

                  (iii) Section 4.03 of Article 4 of the Indenture is hereby
 amended and restated in

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         its entirety to read as follows:

                           "Section  4.03  Compliance   Certificates.   (a)  The
                           Company  shall  deliver  to  the  Trustee  within  60
                           calendar  days after the end of each of the Company's
                           fiscal  quarters (90  calendar  days after the end of
                           the  Company's  last fiscal  quarter of each year) an
                           Officer's  Certificate  executed  by  Officers of the
                           Company  stating  whether or not the signers  know of
                           any Default or Event of Default which occurred during
                           such  fiscal  quarter.  In the case of the  Officer's
                           Certificate  delivered  within 90 calendar days after
                           the  end  of  the   Company's   fiscal   year,   such
                           certificate  shall contain a  certification  from the
                           principal  executive  officer,   principal  financial
                           officer  or  principal   accounting  officer  of  the
                           Company  stating (i) that a review of the  activities
                           of  the   Company  has  been  made  with  a  view  to
                           determining   whether  its   obligations   under  the
                           Indenture  have been  complied  with and (ii) whether
                           such  officer has  obtained  knowledge of any Default
                           under the Indenture  during the 12-month period ended
                           on the date of the financial  statements.  If they do
                           know of such a  Default  or  Event  of  Default,  the
                           certificate  shall describe any such Default or Event
                           of Default,  and its status  including  its duration.
                           The first  certificate  to be  delivered  pursuant to
                           this  Section  4.03(a)  shall be for the first fiscal
                           quarter   beginning   after  the  execution  of  this
                           Indenture.

                           (b) The Company  shall deliver to the Trustee as soon
                           as possible and in any event within 10 calendar  days
                           after the Company,  as the case may be, becomes aware
                           of the occurrence of each Default or Event of Default
                           that is continuing,  an Officer's Certificate setting
                           forth  the  details  of  such  Default  or  Event  of
                           Default,  and the action that the Company proposes to
                           take with respect thereto."

                  (iv)     Section 6.01 of Article 6 of the Indenture is hereby
 amended and restated
         in its entirety to read as follows:

                           "Section 6.01  Events of Default.  (a)  An "Event of
 Default" occurs if one
                           of the following shall have occurred and be
 continuing:

                                            (i)  the  Company  defaults  in  the
                                            payment of (A) the  principal of (or
                                            premium,  if any, on) any Securities
                                            when  the  same   becomes   due  and
                                            payable at maturity, by acceleration
                                            or  otherwise,  (B) any Sinking Fund
                                            Payment on the required payment date
                                            thereof, or (C) the Redemption Price
                                            on any Redemption Date;

                                            (ii)  the Company defaults in the
 payment of interest on any

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                                            Security  when the same  becomes due
                                            and payable, which default continues
                                            for a period of 30 calendar days;

                                            (iii) the Company or any  Subsidiary
                                            of the Company  fails to comply with
                                            any of its  covenants or  agreements
                                            in the  Securities,  this  Indenture
                                            (other  than  those  referred  to in
                                            clauses  (i) and (ii)  above) or the
                                            Pledge  Agreement,  and such failure
                                            continues for 30 calendar days after
                                            receipt  by the  Company of a Notice
                                            of Default;

                                            (iv)  (A)  the  Securities,  or  any
                                            material provision of this Indenture
                                            or the Pledge  Agreement,  ceases to
                                            be valid or binding on the  Company,
                                            (B)  the  Pledge  Agreement  for any
                                            reason  after the  Initial  Issuance
                                            Date  ceases to create a valid  Lien
                                            on   any  of   the   Pledged   Stock
                                            purported  to be covered  thereby in
                                            which  the  Trustee  has a  security
                                            interest  for  the  benefit  of  the
                                            Trustee and the Holders, or any such
                                            Lien ceases to be a perfected  first
                                            priority Lien, or (C) the Company or
                                            any  of its  Subsidiaries  initiates
                                            any suit or  proceeding  challenging
                                            the     legality,     validity    or
                                            enforceability   of   any   of   the
                                            foregoing    or   the    attachment,
                                            perfection  or priority of any Liens
                                            granted   to  secure   payment   and
                                            performance of the Securities;

                                    (b) A Default  under clause (iii) of Section
                                    6.01(a) is not an Event of Default until the
                                    Trustee notifies the Company, or the Holders
                                    of  at  least  25%  in  aggregate  principal
                                    amount  of  the   Securities   at  the  time
                                    outstanding   notify  the  Company  and  the
                                    Trustee, of the Default and the Company does
                                    not  cure  such  Default   within  the  time
                                    specified in clause (iii) of Section 6.01(a)
                                    after  receipt  of  such  notice.  Any  such
                                    notice must specify the Default, demand that
                                    it be remedied and state that such notice is
                                    a "Notice of Default".

                                    (c)  Subject to the  provisions  of Sections
                                    7.01 and  7.02,  the  Trustee  shall  not be
                                    charged  with  knowledge  of a Default or an
                                    Event of Default under this Indenture unless
                                    and until  written  notice  thereof has been
                                    given to the Trustee by the Company."



                                                         4





                                                    ARTICLE TWO

                                             Miscellaneous Provisions

         Section 2.1 Counterparts.  This Supplemental  Indenture may be executed
in  counterparts,  each of  which  when so  executed  shall be  deemed  to be an
original,  but all such counterparts shall together  constitute one and the same
instrument.

         Section  2.2  Severability.  In the event  that any  provision  in this
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 2.3  Headings.  The article and section headings herein are for
 convenience only
and shall not affect the construction hereof.

         Section 2.4  Successors and Assigns.  All the covenants,  stipulations,
promises and  agreements in this  Supplemental  Indenture by or on behalf of the
Company or the Trustee shall bind its respective successors and assigns, whether
so expressed or not.

         Section 2.5  Governing Law.  THIS SUPPLEMENTAL INDENTURE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE AND PERFORMED
WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF
CONFLICTS OF LAWS.

         Section 2.6 Effect of Supplemental Indenture. Except as amended by this
Supplemental  Indenture,  the terms and provisions of the Indenture shall remain
in full force and effect,  and the Indenture as amended and supplemented by this
Supplemental Indenture is in all respects confirmed and preserved.

         Section 2.7 Trustee.  The Trustee accepts the  modifications  of trusts
referenced in the Indenture and effected by this Supplemental Indenture. Without
limiting the generality of the foregoing,  the Trustee assumes no responsibility
for the  correctness of the recitals herein  contained,  which shall be taken as
the  statements  of the Company,  and the Trustee  shall not be  responsible  or
accountable  in any  way  whatsoever  for or with  respect  to the  validity  or
execution or sufficiency of this Supplemental  Indenture,  and the Trustee makes
no representation with respect thereto.


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         IN  WITNESS  WHEREOF,  the  undersigned,  being duly  authorized,  have
executed this Supplemental  Indenture on behalf of the respective parties hereto
as of the date first above written.


Attest:                                                       CINEMARK USA, INC.





                                                              By:
Name:                                                         Name:
Title:                                                        Title:





Attest:                                            THE BANK OF NEW YORK,
                                                     successor to NationsBank of
                                                     Texas, N.A., as Trustee




                                                              By:
Name:                                                         Name:
Title:                                                        Title:
















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