Exhibit 1.1
              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                    Depositor
                   [_________________________] Mortgage-Backed
                   Pass-Through Certificates, Series 200_-___
                               [__________, 200_]
                                     FORM OF
                             UNDERWRITING AGREEMENT
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Credit Suisse First Boston Corporation
Eleven ▇▇▇▇▇▇▇ ▇▇▇▇▇▇
▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇
Ladies and Gentlemen:
     1.  Introduction.  Credit Suisse First Boston Mortgage  Securities Corp., a
Delaware corporation (the "Depositor"), proposes to form one or more real estate
mortgage investment  conduits (each, a "Trust"),  which will issue, from time to
time,  securities  entitled  [_________________]   Mortgage-Backed  Pass-Through
Certificates,  Series 200_-___ (the "Certificates") in one or more series (each,
a "Series").  Each Certificate will evidence a fractional,  undivided percentage
interest  or  beneficial  interest  in a Trust.  The  property of each Trust may
consist  primarily  of pools (the  "Mortgage  Loan  Pools") of loans  secured by
mortgages on residential  properties (the "Mortgage  Loans") and certain related
property to be conveyed to the Trust by the Depositor  (the "Trust  Fund").  The
Mortgage Loans may be sold to the Depositor pursuant to a Mortgage Loan Purchase
Agreement,  dated as set forth in the applicable Terms Agreement (as hereinafter
defined)  (each, a "Sale and Purchase  Agreement"),  between the  Depositor,  as
purchaser,  and a third party seller (the "Seller").  The  Certificates  will be
issued pursuant to a Pooling and Servicing Agreement to be dated as set forth in
the  applicable  Terms  Agreement  (the "Pooling and Servicing  Agreement"  and,
together with this  Agreement and the related Sale and Purchase  Agreement,  the
"Agreements"),  among the Depositor,  a servicer (the "Servicer")  named in such
Terms Agreement and a trustee (the "Trustee") named in such Terms Agreement.
     The Certificates are more fully described in the Registration Statement (as
such term is defined in Section 2(a)), which the Depositor has furnished to you.
Each Series of Certificates  and any classes of  Certificates  (each, a "Class")
within  such  Series may vary,  among  other  things,  as to number and types of
Classes,  aggregate  principal  balance or notional  amount or aggregate  stated
principal  balance,  the  pass-through  rate with  respect  to each  Class,  the
percentage  interest,  if any,  evidenced by each Class in payments of principal
and interest on, or with respect to, the Mortgage  Loans included in the related
Trust Fund, the stated principal
balance and interest rate, if any, priority of payment among Classes, the method
of credit  enhancement  with respect to the Mortgage Loans in the Trust Fund for
such  Series,  the  Classes  of  Certificates  of such  Series  subject  to this
Agreement,  and  any  other  variable  terms  contemplated  by the  Pooling  and
Servicing  Agreement and in the Certificates of such Series.  The Depositor will
elect to treat the  related  Trust  Fund as one or more  "real  estate  mortgage
investment  conduits"  (each, a "REMIC") under the Internal Revenue Code of 1986
(the "Code").
     Each  offering of  Certificates  will be made through you,  through you and
other  underwriters  from whom you are  acting as  representative  or through an
underwriting syndicate managed by you. Whenever the Depositor determines to form
a Trust and to make such an  offering  of  Certificates,  it will  enter into an
agreement (the "Terms  Agreement")  providing for the sale of such  Certificates
to, and the purchase and offering  thereof by, (i) you,  (ii) you and such other
underwriters  who  execute  the  Terms  Agreement  and agree  thereby  to become
obligated to purchase  Certificates  from the  Depositor,  or (iii) you and such
other underwriters, if any, selected by you as have authorized you to enter into
such Terms  Agreement on their behalf (in each case, the  "Underwriters").  Such
Terms Agreement shall specify the fractional  undivided  interest,  principal or
notional amount, or stated principal balance,  of each Class of the Certificates
subject  to this  Agreement,  the  price at which  such  Certificates  are to be
purchased  by the  Underwriters  from the  Depositor,  the  aggregate  amount of
Certificates to be purchased by each Underwriter and any other  Underwriter that
is a party to such Terms  Agreement and the initial public offering price or the
method  by which  the price at which  such  Certificates  are to be sold will be
determined.  The Terms  Agreement,  which shall be  substantially in the form of
Exhibit A hereto, which may take the form of an exchange of any standard form of
written  telecommunication  between  you and the  Depositor.  Each  offering  of
Certificates  will  be  governed  by  this  Agreement,  as  supplemented  by the
applicable  Terms  Agreement,  and this Agreement and such Terms Agreement shall
inure to the benefit of and be binding upon the related Underwriters.  Except as
otherwise  required by the context,  all references herein to a Terms Agreement,
Delivery Date,  Pooling and Servicing  Agreement and Underwriters shall refer to
the  Terms  Agreement,  Delivery  Date,  Pooling  and  Servicing  Agreement  and
Underwriter  or  Underwriters,  as the  case  may be,  relating  to the  related
offering of Certificates.
     2.   Representations  and  Warranties  of  the  Depositor.   The  Depositor
represents and warrants to the  Underwriters as of the date hereof and as of the
date of the applicable Terms Agreement, as follows:
          (a) A registration statement on Form S-3 (No. 333-______), including a
     prospectus  and such  amendments  thereto as may have been  required to the
     date hereof,  relating to the  Certificates and the offering of each Series
     thereof from time to time in accordance  with Rule 415 under the Securities
     Act of 1933, as amended (the "Act"), has been filed with the Securities and
     Exchange Commission (the "Commission") and such registration  statement, as
     amended, has become effective.  For purposes of this Agreement,  "Effective
     Time" means the date and time as of which such registration  statement,  or
     the most recent  post-effective  amendment  thereto (if any) filed prior to
     the execution and delivery of this Agreement, was declared effective by the
     Commission and "Effective  Date" means the date of the Effective Time. Such
     registration   statement,  as  amended,  and  the  prospectus  and  related
     prospectus  supplement  that the  Depositor  has filed with the  Commission
     pursuant to Rule 424(b)  relating  to the sale of the  Certificates
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     of the applicable  Series offered thereby  constituting a part thereof,  as
     from time to time amended or supplemented  (including any prospectus  filed
     with the Commission pursuant to Rule 424(b) of the rules and regulations of
     the Commission  promulgated  under the Act (the "Rules and  Regulations")),
     including all documents incorporated therein by reference, are respectively
     referred  to as the  "Registration  Statement",  the  "Prospectus"  and the
     "Prospectus  Supplement";  provided,  however,  that  a  supplement  to the
     Prospectus  prepared  pursuant  to  Section  5(a)  shall be  deemed to have
     supplemented the Prospectus only with respect to the offering of the Series
     of  Certificates  to  which  it  relates.  The  conditions  to the use of a
     registration  statement  on Form S-3  under  the Act,  as set  forth in the
     General  Instructions to Form S-3, and the conditions of Rule 415 under the
     Act, have been satisfied with respect to the Registration Statement.
          (b)  The  Registration  Statement,  on the  Effective  Date,  and  the
     Prospectus, as of the date of the related Prospectus Supplement,  conformed
     in all material  respects to the  requirements of the Act and the Rules and
     Regulations, and did not include any untrue statement of a material fact or
     omit to state any material fact required to be stated  therein or necessary
     to make the  statements  therein  not  misleading,  and on the date of this
     Agreement,  at the time of the filing of the  Prospectus  pursuant  to Rule
     424(b) and at the  Delivery  Date (as such terms as defined in Section  3),
     the  Prospectus  conforms and will conform in all material  respects to the
     requirements of the Act and the Rules and Regulations, and does not include
     and will not include,  any untrue statement of a material fact and does not
     omit and will not omit to state any  material  fact  necessary  in order to
     make the statements  therein, in the light of the circumstances under which
     they  were  made,  not   misleading.   The  Prospectus   delivered  to  the
     Underwriters  for use in connection with the related offering was identical
     to the electronically  transmitted copies thereof filed with the Commission
     pursuant to its Electronic Data Gathering,  Analysis and Retrieval  system,
     except to the extent  permitted  by  Regulation  S-T.  The two  immediately
     preceding  sentences do not apply to statements or omissions from either of
     such  documents  based upon written  information  (including  Computational
     Materials  (as such term is  defined  in  Section  8(a))  furnished  to the
     Depositor by any Underwriter specifically for use therein.
          (c) The Depositor has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware,  with
     full  corporate  power and  authority  to own its  assets and  conduct  its
     business as described  in the  Prospectus,  is duly  qualified as a foreign
     corporation in good standing in all jurisdictions in which the ownership or
     lease  of  its  property  or the  conduct  of its  business  requires  such
     qualification, except where the failure to be so qualified would not have a
     material adverse effect on the Depositor, and is conducting its business so
     as to  comply  in all  material  respects  with  the  applicable  statutes,
     ordinances,  rules  and  regulations  of the  jurisdictions  in which it is
     conducting business.
          (d) The Pooling and Servicing Agreement and the Certificates  conform,
     or  will  conform  as of the  Delivery  Date,  to the  description  thereof
     contained  in the  Registration  Statement  and  the  Prospectus;  and  the
     Certificates,  on the date of the Terms Agreement,  will have been duly and
     validly  authorized  and,  when  such  Certificates  are duly  and  validly
     executed by the Depositor or the Trustee, authenticated
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     by the Trustee and delivered in accordance  with such Pooling and Servicing
     Agreement and delivered  and paid for as provided  herein,  will be validly
     issued and outstanding  and entitled to the benefits and security  afforded
     by the Pooling and Servicing Agreement.
          (e) The execution and delivery by the Depositor of this Agreement, the
     Terms Agreement, the Pooling and Servicing Agreement, the Sale and Purchase
     Agreement  and the  Certificates  are  within  the  corporate  power of the
     Depositor  and  have  been,  or will  have  been,  duly  authorized  by all
     necessary  corporate  action on the part of the Depositor;  and neither the
     execution  and  delivery  by the  Depositor  of such  instruments,  nor the
     consummation  by  the  Depositor  of the  transactions  herein  or  therein
     contemplated,  nor the  compliance  by the  Depositor  with the  provisions
     hereof or  thereof,  will (i)  conflict  with or result in a breach  of, or
     constitute a default  under,  any of the  provisions of the  certificate of
     incorporation  or by-laws of the  Depositor,  (ii) conflict with any of the
     provisions of any law, governmental rule, regulation,  judgment,  decree or
     order binding on the Depositor or its  properties,  (iii) conflict with any
     of the provisions of any indenture,  mortgage, contract or other instrument
     to which the  Depositor is a party or by which it is bound,  or (iv) result
     in the creation or imposition of any lien,  charge or encumbrance  upon any
     of its  property  pursuant  to the terms of any such  indenture,  mortgage,
     contract or other instrument.
          (f) At the date  thereof,  the Pooling and  Servicing  Agreement  will
     constitute  a  legal,  valid  and  binding  obligation  of  the  Depositor,
     enforceable against the Depositor in accordance with its terms, subject, as
     to  enforcement  of remedies,  to  applicable  bankruptcy,  reorganization,
     insolvency,  moratorium and other similar laws affecting  creditors' rights
     generally from time to time in effect, and to general principles of equity.
          (g) All approvals,  authorizations,  consents, orders or other actions
     of  any  person,  corporation  or  other  organization,  or of  any  court,
     governmental  agency or body or official  (except with respect to the state
     securities  or  Blue  Sky  laws  of  various  jurisdictions),  required  in
     connection  with the valid and proper  authorization,  issuance and sale of
     the  Certificates  pursuant to this Agreement,  the Terms Agreement and the
     Pooling and Servicing  Agreement,  has been or will be taken or obtained on
     or prior to the applicable Delivery Date.
          (h) At the  applicable  Delivery  Date,  each  of the  Mortgage  Loans
     included in the Trust Fund will meet the criteria for  selection  described
     in the Prospectus.
          (i) Certificates subject to this Agreement and offered by means of the
     Registration  Statement  will,  when  issued  pursuant  to the  Pooling and
     Servicing  Agreement,  be "mortgage  related  securities",  as such term is
     defined in Section  3(a)(41) of the  Securities  Exchange  Act of 1934,  as
     amended (the "Exchange Act"), if, and for so long as, such Certificates are
     rated in one of the two highest rating categories  assigned by at least one
     nationally recognized statistical rating organization.
          (j) At the date of its execution  and delivery,  the Sale and Purchase
     Agreement  constituted a legal, valid and binding agreement,  and as of the
     Delivery Date
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     will be enforceable by the Trustee, in accordance with its terms,  subject,
     as to enforcement  of remedies,  to applicable  bankruptcy,  reorganization
     insolvency or other similar laws affecting creditors' rights generally from
     time to time in effect, and to general principles of equity.
          (k) The characteristics of the Trust Fund will not subject the related
     Trust to registration as an investment company under the Investment Company
     Act of 1940, as amended (the "Investment Company Act").
     3. Purchase, Sale and Delivery of Certificates. Delivery of and payment for
the  Certificates to which this Agreement  applies will be made at the office of
[Credit Suisse First Boston  Corporation,  Eleven ▇▇▇▇▇▇▇ ▇▇▇▇▇▇,  ▇▇▇ ▇▇▇▇, ▇▇▇
▇▇▇▇ ▇▇▇▇▇] or such other place as  specified  in the Terms  Agreement,  at such
time as shall  be  specified  in the  Terms  Agreement,  or at such  other  time
thereafter  as set forth in the  Terms  Agreement,  or as you and the  Depositor
shall agree upon, each such time being herein referred to as a "Delivery  Date".
Delivery of such Certificates shall be made by the Depositor to the Underwriters
against  payment  of  the  purchase  price  specified  in the  applicable  Terms
Agreement  in same day  funds  wired to such  bank as may be  designated  by the
Depositor,  or by such  other  manner of  payment  as may be agreed  upon by the
Depositor and you. Except as otherwise  provided in the related Terms Agreement,
each Class of Certificates of a Series sold to the Underwriters pursuant to such
Terms  Agreement  will be  represented  initially  by one or  more  certificates
registered  in the  name of Cede & Co.,  the  nominee  of The  Depository  Trust
Company ("DTC") (the "DTC Certificates"). The interests of the beneficial owners
of the DTC  Certificates  will be  represented by book entries on the records of
DTC and  participating  members  thereof.  Definitive  certificates  for the DTC
Certificates  will  be made  available  only  under  the  limited  circumstances
specified in the Pooling and Servicing  Agreement.  Except as otherwise provided
in the related Terms Agreement,  each Class of Certificates of a Series not sold
to the  Underwriters  pursuant to such Terms  Agreement  will be in  definitive,
fully registered form, in such denominations and registered in such names as the
Underwriter shall request, and will be made available at least 24 hours prior to
the applicable  Closing Date, for checking and packaging at the offices of [] in
such amounts as determined pursuant to the Terms Agreement.
     Except as otherwise  provided in the related Terms  Agreement,  pursuant to
Rule 15c6-1(d) under the Exchange Act, the Depositor and the  Underwriters  have
agreed that the Delivery Date will not be less than five business days following
the date hereof.
     4. Offering by Underwriters. It is understood that the Underwriters propose
to offer the  Certificates  subject to this  Agreement for sale to the public as
set forth in the Prospectus.
     5. Covenants of the Depositor.  The Depositor covenants and agrees with the
Underwriters participating in the applicable offering of the Certificates that:
          (a) Immediately following the execution of the Terms Agreement,  or at
     such other time as the Depositor and the Underwriter  shall mutually agree,
     the Depositor will prepare a supplement to the Prospectus setting forth the
     amount of Certificates  covered thereby and the terms thereof not otherwise
     specified in the
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     Prospectus, the price at which such Certificates are to be purchased by the
     Underwriters,  from the Depositor, either the initial public offering price
     or the method by which the price at which such  Certificates are to be sold
     will be determined,  the selling concessions and reallowances,  if any, and
     such  other  information  as you  and the  Depositor  deem  appropriate  in
     connection with the offering of such  Certificates,  but the Depositor will
     not file,  for so long as the  delivery  of a  Prospectus  is  required  in
     connection with the offering or sale of such  Certificates,  any amendments
     to  the   Registration   Statement  as  in  effect  with  respect  to  such
     Certificates, or any amendments or supplements to the Prospectus, unless it
     shall first have delivered copies of such amendments or supplements to you,
     or if you shall have  reasonably  objected  thereto  promptly after receipt
     thereof; the Depositor will, during such period,  immediately advise you or
     your  counsel  (i) when  notice is received  from the  Commission  that any
     post-effective  amendment to the Registration  Statement has become or will
     become  effective  and (ii) of any order or  communications  suspending  or
     preventing, or threatening to suspend or prevent, the offer and sale of the
     Certificates or of any proceedings or examinations that may lead to such an
     order or  communication,  whether by or of the  Commission or any authority
     administering  any  state  securities  or  Blue  Sky  law,  as  soon as the
     Depositor is advised thereof,  and will use its best efforts to prevent the
     issuance  of any  such  order or  communication  and to  obtain  as soon as
     possible its lifting,  if issued.  Subject to the Underwriters'  compliance
     with their  obligations  set forth in Section 8, the  Depositor  shall file
     with  the   Commission  a  current   report  on  Form  8-K   including  any
     Computational  Materials  provided  to it by the  Underwriters  pursuant to
     Section 8 no later than the date that the Prospectus Supplement is filed.
          (b) If, at any time when a Prospectus  relating to the Certificates is
     required to be  delivered  under the Act,  any event  occurs as a result of
     which the  Prospectus  as then amended or  supplemented  would  include any
     untrue  statement  of a  material  fact or omit to  state a  material  fact
     necessary  in order to make the  statements  therein,  in the  light of the
     circumstances  under  which they were  made,  not  misleading,  or if it is
     necessary at any time to amend or supplement  the Prospectus to comply with
     the Act or the Rules and  Regulations,  the Depositor will promptly prepare
     and file with the Commission,  an amendment or supplement that will correct
     such   statement  or  omission  or  an  amendment  that  will  effect  such
     compliance.
          (c) The Depositor will make generally  available to the holders of the
     Certificates (the  "Certificateholders"),  and deliver to you, in each case
     as soon as  practicable,  an  earning  statement  which  will  satisfy  the
     provisions of Section 11(a) of the Act and Rule 158 of the Commission  with
     respect to the  Certificates;  and the Depositor  will cause the Trustee to
     furnish or make  available,  within a reasonable time after the end of each
     calendar year, to each Certificateholder at any time during such year, such
     information  as the  Depositor  deems  necessary  or  desirable  to  assist
     Certificateholders in preparing their federal income tax returns.
          (d) The  Depositor  will  furnish  to you  copies of the  Registration
     Statement  (two of which will be signed and will include all  documents and
     exhibits  thereto or  incorporated  by  reference  therein),  each  related
     preliminary  prospectus,  the Prospectus and all amendments and supplements
     to such documents relating to the
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     Certificates, in each case as soon as available, but in no event later than
     five business days after signing the related Terms  Agreement,  and in such
     quantities as you reasonably request.
          (e)  The  Depositor  will  arrange  for  the   qualification   of  the
     Certificates  for  sale and the  determination  of  their  eligibility  for
     investment  under the laws of such  jurisdictions as you designate and will
     continue  such  qualifications  in  effect  so  long  as  required  for the
     distribution  of the  Certificates;  PROVIDED,  HOWEVER,  that  neither the
     Depositor   nor  the  Trust  shall  be  required  to  do  business  in  any
     jurisdiction  where it is now not  qualified  or to take any  action  which
     would  subject  it to  general  or  unlimited  service  of  process  in any
     jurisdiction in which it is now not subject to service of process.
          (f) The  Depositor  will,  while  the  Certificates  of a  Series  are
     outstanding  furnish to you,  and upon  request of each other  Underwriter,
     other  information  with  respect  to the  related  Trust or its  financial
     condition  or results of  operations,  as any  Underwriter  may  reasonably
     request,  including but not limited to information necessary or appropriate
     to the  maintenance  of a  secondary  market  in the  Certificates  of such
     Series.
          (g) The Depositor will pay all expenses incident to the performance of
     its  obligations  under this  Agreement  and the Terms  Agreement  and will
     reimburse  the   Underwriters   for  any  expenses   (including   fees  and
     disbursements  of  its  counsel)   incurred  by  them  in  connection  with
     qualification  of the related Series of Certificates  and  determination of
     their  eligibility for investment  under the laws of such  jurisdictions as
     you may designate and the reproduction of memoranda  relating thereto,  for
     any fees  charged  by  investment  rating  agencies  for the  rating of the
     Certificates  and,  to the  extent  previously  agreed  upon with you,  the
     expenses  incurred  in  distributing  any  preliminary  prospectuses,   the
     Prospectus or any amendments or supplements thereto to the Underwriters.
          (h) During the  period  when a  prospectus  is  required  by law to be
     delivered  in  connection  with the sale of  Certificates  pursuant to this
     Agreement,  the Depositor will file, or cause the Trustee to file on behalf
     of the related Trust,  on a timely and complete  basis,  all documents that
     are required by the related Trust with the Commission  pursuant to Sections
     13, 14 or 15(d) of the Exchange Act.
          (i) [The Depositor will prepare, or cause to be prepared, and file, or
     cause to be filed,  a timely  election to treat each Trust REMIC as a REMIC
     for federal  income tax purposes and will file, or cause to be filed,  such
     tax returns and take such actions,  all on a timely basis,  as are required
     to elect and maintain such status.]
     6.  Conditions to the Obligations of the  Underwriters.  The obligations of
the  Underwriters  to  purchase  and pay for the  Certificates  subject  to this
Agreement will be subject to the accuracy of the  representations and warranties
on the part of the  Depositor  as of the  date  hereof,  the  date of the  Terms
Agreement and the applicable Delivery Date, to the accuracy of the statements of
the Depositor made pursuant to the provisions thereof, to the performance by the
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Depositor  in all  material  respects of its  obligations  hereunder  and to the
following additional conditions precedent:
          (a) You shall have  received a letter from the Officer of  Deposition,
     dated the date of the  Prospectus  Supplement  and addressed to you each in
     the forms heretofore agreed to.
          (b) You shall have received a copy of the  Prospectus  for the related
     Series.
          (c) All actions  required  to be taken and all filings  required to be
     made by the Depositor  under the Act prior to the sale of the  Certificates
     shall have been duly taken or made;  and prior to the  applicable  Delivery
     Date,  no stop  order  suspending  the  effectiveness  of the  Registration
     Statement  shall have been issued and no proceedings for that purpose shall
     have  been  instituted,  or to  the  knowledge  of  the  Depositor  or  any
     Underwriter, shall be contemplated by the Commission.
          (d) The Certificates subject to this Agreement and offered by means of
     the  Registration  Statement  shall be rated at the time of issuance as set
     forth in the Terms Agreement.
          (e) you shall have  received an opinion of counsel for the  Depositor,
     dated the applicable Delivery Date, substantially to the effect that:
                    (i) The Depositor is a corporation  duly organized,  validly
               existing  and in good  standing  under  the laws of the  State of
               Delaware,  with full corporate  power and corporate  authority to
               own its assets and operate its  business as is necessary to carry
               out the transactions contemplated by the Agreements,  and is duly
               qualified to do business as a foreign corporation in the State of
               New York.
                    (ii) This  Agreement and the Terms  Agreement have been duly
               authorized, executed and delivered by the Depositor.
                    (iii)  The  execution,   delivery  and  performance  of  the
               Agreements do not conflict with the Certificate of  Incorporation
               or the By-laws of the  Depositor  and, to the  knowledge  of such
               counsel  and based  solely on its  examination  of the  documents
               referred to in such opinion,  (A) do not conflict with or violate
               or  constitute  a  material  breach of, or  constitute  a default
               under, any material written contract,  indenture,  undertaking or
               other agreement or instrument by which the Depositor is now bound
               or to which it is now a party, or result in the imposition of any
               material lien upon any of its material properties, and (B) do not
               conflict  with or violate  any order,  write,  injunction  or the
               decree  of  any  court  or  governmental  authority  against  the
               Depositor or by which any of its properties is bound.
                    (iv) Each of the Sale and Purchase Agreement and the Pooling
               and Servicing  Agreement has been duly  authorized,  executed and
               delivered by the Depositor and,  assuming the due  authorization,
               execution and delivery thereof by
                                       8
               the other  parties  thereto,  constitutes  the  legal,  valid and
               binding  agreement  of the  Depositor,  enforceable  against  the
               Depositor in  accordance  with its terms,  except as  enforcement
               thereof may be subject to or limited by  bankruptcy,  insolvency,
               moratorium, reorganization, arrangement, fraudulent conveyance or
               other laws relating to or affecting  creditors'  rights generally
               or by general equitable principles.
                    (v)  The  Certificates  have  been  duly  authorized  by the
               Depositor  and, when executed and  authenticated  pursuant to the
               Pooling  and  Servicing  Agreement  and  paid  for and  delivered
               pursuant  to this  Agreement  and the  Terms  Agreement,  will be
               validly  issued  and  outstanding  and  will be  entitled  to the
               benefits afforded by the Pooling and Servicing Agreement.
                    (vi) No  authorization,  consent,  approval of, notice to or
               other  filing with any federal or State of New York  governmental
               authority  is  required  for the  execution  of,  delivery  of or
               performance by the Depositor of any material obligation under the
               Agreements  or the  Certificates  except  (a)  such as have  been
               obtained  under the Act and (b) such as may be required under the
               blue sky laws of any  jurisdiction  in connection  with the offer
               and sale of the Certificates, as to which we express no opinion.
                    (vii) The Pooling and Servicing Agreement is not required to
               be qualified  under the Trust Indenture Act of 1939 and the Trust
               Fund  is not  required  to be  registered  under  the  Investment
               Company Act.
                    (viii) The Registration Statement has become effective under
               the Act,  and, to the  knowledge of such  counsel,  no stop order
               suspending the  effectiveness of the  Registration  Statement has
               been  issued  and no  proceedings  for  that  purpose  have  been
               instituted  or are  pending or  contemplated  under the Act;  the
               Registration Statement and the Prospectus,  and each amendment or
               supplement  thereto,  as of their  respective  effective or issue
               dates  complied  as to  form  in  all  material  respects  to the
               requirements  of the Act  and the  Rules  and  Regulations;  such
               counsel  has no reason to believe  that  either the  Registration
               Statement,  at the  Effective  Time,  or any  such  amendment  or
               supplement,  as of  its  effective  date,  contained  any  untrue
               statement  of a material  fact or  omitted to state any  material
               fact  required  to be stated  therein  or  necessary  to make the
               statements therein not misleading, or that the Prospectus, at the
               date of this Agreement,  or any such amendment or supplement,  as
               of its  respective  date,  or at the Delivery  Date,  included or
               includes  an untrue  statement  of a material  fact or omitted or
               omits to state a  material  fact  necessary  in order to make the
               statements therein, in the light of the circumstances under which
               they were made, not  misleading;  it being  understood  that such
               counsel need express no opinion as to the financial statements or
               other financial or statistical data contained in the Registration
               Statement or the Prospectus or with respect to the description in
               the  Prospectus  Supplement  under the  headings  "The Seller and
               Servicer,"   "Description  of  the  Mortgage  Pool--General"  and
               "--Underwriting Standards".
                                       9
                    (ix) The  statements  in the  Prospectus  under the  caption
               "Description  of   Certificates",   insofar  as  such  statements
               constitute a summary of certain  terms of the  Certificates,  the
               Sale  and  Purchase  Agreement  and  the  Pooling  and  Servicing
               Agreement,  while they do not  purport to discuss  all aspects of
               such  documents,  constitute a fair summary of such  documents in
               all material  respects;  the statements in the Prospectus and the
               Prospectus  Supplement,  as the case may be,  under the  captions
               "Certain  Legal  Aspects of the  Mortgage  Loans and  Contracts",
               "ERISA  Considerations"  and "Federal Income Tax Consequences" to
               the  extent  that  they  constitute   matters  of  law  or  legal
               conclusions with respect thereto,  have been prepared or reviewed
               by such counsel and are correct in all material respects.
                    (x)  Assuming  that,  and  for so long  as,  each  Class  of
               Certificates  offered pursuant to the Registration  Statement are
               rated by a nationally recognized  statistical rating organization
               in one of its two highest rating  categories,  each such Class of
               Certificates constitutes "mortgage related securities" within the
               meaning of Section 3(a)(41) of the Exchange Act.
                    (xi) [Assuming compliance with all provisions of the Pooling
               and Servicing Agreement,  under existing law, (a) the Trust REMIC
               I and Trust  REMIC II (as such terms are  defined in the  Pooling
               and Servicing  Agreement)  will each be treated as a "real estate
               mortgage  investment  conduit"  (a "REMIC") as defined by Section
               860D of the Internal Revenue Code of 1986 (the "Code"),  (b) each
               of the [Class A],  [Class M] and [Class B]  Certificates  will be
               treated as (or will be comprised of) "regular interests" in Trust
               REMIC II, as the term "regular  interest" is defined in the Code,
               (c) the  [Class  R-1]  Certificates  will be  treated as the sole
               class  of  "residual  interests"  in  Trust  REMIC I, as the term
               "residual  interest"  is defined in the Code,  and (d) the [Class
               R-2]  Certificates will be treated as the sole class of "residual
               interests" in Trust REMIC II, as the term "residual  interest" is
               defined in the Code. However, continuation of the status of Trust
               REMIC I and Trust REMIC II as REMICs may entail  compliance  with
               statutory  changes  in the future  and with  regulations  not yet
               issued.]
          (f) You shall have  received  an  opinion  of  counsel to the  Seller,
     addressed  to the  Underwriters  and the  Depositor,  dated the  applicable
     Delivery  Date,  substantially  to the effect  that the  statements  in the
     Prospectus  Supplement  prepared by the Depositor  pursuant to Section 5(a)
     under the  captions  ["___________,"]  ["________"],  ["___________"],  and
     ["___________"]  do not contain any untrue  statement of a material fact or
     omit to state a material fact required to be stated therein or necessary in
     order to make the  statements  therein,  in the light of the  circumstances
     under which they were made, not misleading (it being  understood  that such
     counsel  need not render any  opinion  with  respect  to any  financial  or
     statistical information contained therein).
          (g) You shall have  received  an  opinion  of  counsel to the  Seller,
     addressed  to the  Underwriters  and the  Depositor,  dated the  applicable
     Delivery Date, and in a form agreed to on or prior to the date of the Terms
     Agreement regarding (i) certain
                                       10
     FDIA bankruptcy insolvency or FDIA matters, (ii) corporate matters relating
     to the seller, (iii)  enforceability  matters relating to the Agreements as
     to which the seller is a party,  and (iv) the  perfection  of the  security
     interest of the Trustee in the Mortgage Notes.
          (h) You shall have  received  an  opinion  of counsel to the  Trustee,
     dated the Delivery  Date, and in the form agreed to on or prior to the date
     of the Terms  Agreement  regarding  (i)  certain  state tax  matters,  (ii)
     corporate matters relating to the Trustee and (iii) enforceability  matters
     relating to the Agreements as to which the Trustee is a party.
          (i) You shall have received from [__________], special counsel for the
     Underwriters,  such opinion or  opinions,  dated the  Delivery  Date,  with
     respect to the existence of the Depositor,  the Registration Statement, the
     Prospectus and other related matters as the Underwriters  may require,  and
     the Depositor  shall have  furnished to such counsel such documents as they
     request for the purpose of enabling them to pass upon such matters.
          (j) You shall have received a certificate  or  certificates  signed by
     such of the principal  executive,  financial and accounting officers of the
     Depositor as you may request,  dated the applicable Delivery Date, in which
     such  officers,   to  the  best  of  their   knowledge   after   reasonable
     investigation,  shall state that (i) the  representations and warranties of
     the Depositor in this  Agreement  are true and correct;  (ii) the Depositor
     has complied with all  agreements  and satisfied all conditions on its part
     to be performed or satisfied at or prior to the Closing Date; (iii) no stop
     order suspending the  effectiveness of the Registration  Statement has been
     issued and no  proceedings  for that  purpose have been  instituted  or are
     contemplated;   (iv)  subsequent  to  the  respective  dates  as  of  which
     information is given in the  Prospectus,  and except as otherwise set forth
     in or  contemplated  by the  Prospectus,  there  has not been any  material
     adverse change in the general affairs, capitalization,  financial condition
     or results of operations of the Depositor;  (v) except as otherwise  stated
     in the  Prospectus,  there are no material  actions,  suits or  proceedings
     pending before any court or governmental  agency,  authority or body or, to
     their  knowledge,  threatened,  affecting the Depositor or the transactions
     contemplated  by this  Agreement;  and (vi)  attached  thereto are true and
     correct  copies of a letter from the rating  agency or agencies  rating the
     Certificates  subject to this Agreement  confirming  that the  Certificates
     have been rated in one of the four highest rating categories established by
     such agency or agencies as set forth in the Terms Agreement and such rating
     has not been lowered since the date of such letter.
          (k)  If  applicable,   you  shall  have  received  letters  dated  the
     applicable  Delivery Date from counsel rendering opinions to any nationally
     recognized  statistical rating organization rating the applicable Series of
     Certificates,  to the effect  that you may rely upon their  opinion to such
     rating organization, as if such opinion were rendered to you.
          (l) You shall have  received a certificate  of the Trustee,  signed by
     one or more duly authorized  officers of the Trustee,  dated the applicable
     Delivery Date, as to
                                       11
     the due  acceptance of the Pooling and  Servicing  Agreement by the Trustee
     and the due  authorization  and delivery of the Certificates of such Series
     by the Trustee thereunder.
          (m)  To  the  extent,  if  any,  that  the  ratings  provided  to  the
     Certificates     by    either     [__________________]     ("______")    or
     [_________________]   ("____")  is  conditional   upon  the  furnishing  of
     documents  or the  taking  of any other  actions  by the  Depositor  or the
     Servicer,  the Depositor or the Servicer, as the case may be, shall furnish
     such documents and take any such other actions.
          (n)  You  shall  have  received  letters  from  [______]  and  [_____]
     confirming the ratings set forth in the related Terms Agreement.
          The Depositor will furnish you with such conformed copies of such
opinions, certificates, letters and documents as you reasonably request.
          7. Indemnification
     (a) The Depositor  will  indemnify and hold harmless each  Underwriter  and
     each person,  if any, who controls such  Underwriter  within the meaning of
     the Act,  against  any losses,  claims,  damages or  liabilities,  joint or
     several,  to which such Underwriter or such  controlling  person may become
     subject,  under  the Act or  otherwise,  insofar  as such  losses,  claims,
     damages or liabilities (or actions in respect  thereof) arise out of or are
     based upon any untrue statement or alleged untrue statement of any material
     fact  contained  in the  Registration  Statement or the  Prospectus  or any
     amendment  or  supplement  thereto,  or arise out of or are based  upon the
     omission or alleged  omission to state  therein a material fact required to
     be  stated  therein  or  necessary  to  make  the  statements  therein  not
     misleading;  and will reimburse each  Underwriter and each such controlling
     person  for  any  legal  or  other  expenses  reasonably  incurred  by such
     Underwriter   and  each  such   controlling   person  in  connection   with
     investigating  or  defending  any such loss,  claim,  damage,  liability or
     action;  provided,  however,  that the Depositor  will not be liable in any
     such case to the extent  that any such  loss,  claim,  damage or  liability
     arises out of or is based upon any such untrue  statement or alleged untrue
     statement in or omission or alleged  omission made in any of such documents
     in reliance upon and in conformity  with written  information  furnished to
     the  Depositor by the relevant  Underwriter  specifically  for use therein.
     This  indemnity  agreement  will be in addition to any liability  which the
     Depositor may otherwise have.
          (b) Each  Underwriter  will indemnify and hold harmless the Depositor,
     each of its  directors,  each of its officers  who signed the  Registration
     Statement and each person,  if any, who controls the  Depositor  within the
     meaning of the Act against any losses,  claims,  damages or  liabilities to
     which the Depositor or any such director, officer or controlling person may
     become subject, under the Act or otherwise, insofar as such losses, claims,
     damages or liabilities (or actions in respect  thereof) arise out of or are
     based upon any untrue statement or alleged untrue statement of any material
     fact  contained  in the  Registration  Statement or the  Prospectus  or any
     amendment  or  supplement  thereto,  or arise out of or are based  upon the
     omission or the alleged  omission to state therein a material fact required
     to be stated therein or necessary to make the
                                       12
     statements therein not misleading,  in each case to the extent, but only to
     the extent,  that such untrue  statement  or alleged  untrue  statement  or
     omission or alleged  omission was made in reliance  upon and in  conformity
     with written  information  furnished to the  Depositor by such  Underwriter
     specifically  for use  therein,  and  will  reimburse  any  legal  or other
     expenses reasonably incurred by the Depositor or any such director, officer
     or controlling  person in connection  with  investigating  or defending any
     such loss, claim,  damage,  liability or action.  This indemnity  agreement
     will be in addition to any liability  that such  Underwriter  may otherwise
     have.
          (c) Promptly after receipt by an indemnified  party under this Section
     of notice of the commencement of any action,  such indemnified  party will,
     if a claim in respect thereof is to be made against the indemnifying  party
     under this  Section,  notify  the  indemnifying  party of the  commencement
     thereof;  but the  omission  so to notify the  indemnifying  party will not
     relieve it from any liability  which it may have to any  indemnified  party
     otherwise in this Section.  In case any such action is brought  against any
     indemnified   party,  and  it  notifies  the  indemnifying   party  of  the
     commencement  thereof,  the indemnifying party to such indemnified party of
     its election so to assume the defense thereof,  the indemnifying party will
     be entitled to  participate  therein,  and, to the extent that it may wish,
     jointly with any other indemnifying party similarly notified, to assume the
     defense thereof,  with counsel  satisfactory to such indemnified party (who
     shall not, except with the consent of the indemnified  party, be counsel to
     the indemnifying  party) and, after notice from the  indemnifying  party to
     such  indemnified  party of its election so to assume the defense  thereof,
     the indemnifying  party will not be liable to such indemnified  party under
     this Section for any legal or other expenses  subsequently incurred by such
     indemnified  party  in  connection  with the  defense  thereof  other  than
     reasonable costs of investigation.
          (d) If the indemnification provided for in this Section is unavailable
     or insufficient to hold harmless an indemnified  party under subsection (a)
     or (b) above, then each  indemnifying  party shall contribute to the amount
     paid or  payable  by such  indemnified  party  as a result  of the  losses,
     claims,  damages or liabilities  referred to in subsection (a) or (b) above
     (i) in such  proportion as is appropriate to reflect the relative  benefits
     received by the Depositor on the one hand and the Underwriters on the other
     from the  offering of the Offered  Certificates  or (ii) if the  allocation
     provided by clause (i) above is not  permitted  by  applicable  law in such
     proportion  as is  appropriate  to reflect not only the  relative  benefits
     referred  to in  clause  (i)  above  but  also  the  relative  fault of the
     Depositor on the one hand and the  Underwriters  on the other in connection
     with the  statements or omissions  which  resulted in such losses,  claims,
     damages  or   liabilities   as  well  as  any  other   relevant   equitable
     considerations.  The relative benefits received by the Depositor on the one
     hand and the  Underwriters  on the other  shall be deemed to be in the same
     proportion  as the total net proceeds from the offering  (before  deducting
     expenses)  received  by  the  Depositor  bear  to  the  total  underwriting
     discounts and commissions received by the Underwriters.  The relative fault
     shall be determined by reference to, among other things, whether the untrue
     or alleged  untrue  statement of a material fact or the omission or alleged
     omission to state a material  fact relates to  information  supplied by the
     Depositor or the Underwriters and the parties' relative intent,  knowledge,
     access to  information  and  opportunity  to correct or prevent such untrue
     statement or omission. The
                                       13
     amount  paid by an  indemnified  party as a result of the  losses,  claims,
     damages or liabilities referred to in the first sentence of this subsection
     (d) shall be  deemed to  include  any  legal or other  expenses  reasonably
     incurred by such indemnified in connection with  investigating or defending
     any  action  or  claim  which  is  the  subject  to  this  subsection  (d).
     Notwithstanding the provisions of this subsection (d), no Underwriter shall
     be required to  contribute  any amount in excess of the amount by which the
     total price at which the Certificates underwritten by it and distributed to
     the public  were  offered to the public  exceeds  the amount of any damages
     which such Underwriter has otherwise been required to pay by reason of such
     untrue or alleged  untrue  statement  or omission or alleged  omission.  No
     person  guilty of  fraudulent  misrepresentation  (within  the  meaning  of
     Section 11(f) of the Act) shall be entitled to contribution from any person
     who was not guilty of such fraudulent misrepresentation.  The Underwriters'
     obligations in this  subsection (d) to contribute are several in proportion
     to their respective underwriting obligations and not joint.
     8. Computational  Materials.  (a) Each Underwriter agrees to provide to the
Depositor  no less  than two  business  days  prior  to the  date on  which  the
Prospectus  is proposed to be filed  pursuant to Rule 424(b)  under the Act, for
the purpose of permitting  the  Depositor to comply with the filing  requirement
set forth in Section 5(a), all information (in such written or electronic format
as required by the Depositor) with respect to the Certificates which constitutes
"Computational  Materials",  as defined in the  Commission's  No-Action  Letter,
dated May 20,  1994,  addressed to ▇▇▇▇▇▇,  ▇▇▇▇▇▇▇  Acceptance  Corporation  I,
▇▇▇▇▇▇,  Peabody & Co. Incorporated and ▇▇▇▇▇▇ Structured Asset Corporation,  as
made applicable to other issuers and  underwriters by the Commission in response
to the  request  of  the  Public  Securities  Association  dated  May  24,  1994
(collectively,  the "▇▇▇▇▇▇/PSA  Letter"), as well as the PSA Letter referred to
below,  and that is required to be filed as described in the ▇▇▇▇▇▇/PSA  Letter.
Each  Underwriter  shall  comply with all  applicable  laws and  regulations  in
connection  with the use of ABS Term Sheets,  including the No-Action  Letter of
February 17, 1995 issued by the Commission to the Public Securities  Association
(the "PSA Letter" and,  together  with the  ▇▇▇▇▇▇/PSA  Letter,  the  "No-Action
Letters").
          (b) The Underwriters shall provide to the Depositor, together with the
     information  required to be provided to the  Depositor  pursuant to Section
     8(a) or 8(c)(iii) hereof, a letter, in form and substance acceptable to the
     Depositor,  of independent  certified public accountants  acceptable to the
     Depositor,  stating  in  effect  that  such  independent  certified  public
     accountants have performed certain specified procedures,  all of which have
     been agreed to by the Depositor,  and that they have verified or confirmed,
     as appropriate,  the financial,  numerical or statistical information to be
     filed by the Depositor as part of the Computational  Materials and ABS Term
     Sheets and have found such  information to be accurate  without  exception.
     Such letter will be obtained at the sole expense of the Underwriters.
          (c) (i) The  relevant  Underwriter  represents  and  warrants  to, and
     covenants  with,  the  Depositor  that  all  information  provided  to  the
     Depositor  pursuant to this Section,  as of the date such information is so
     provided and as of the date such information is filed by the Depositor with
     the Commission will not include any untrue statement of a material fact and
     will not omit to state any material facts required to be
                                       14
     stated  therein  or  necessary  in order to make the  statements  contained
     therein,  in the light of the circumstances under which they were made, not
     misleading.
               (ii)  The  relevant   Underwriter   further  covenants  with  the
          Depositor  that if any  Computational  Materials  or ABS  Term  Sheets
          required to be provided to the Depositor  pursuant to Section 8(a) are
          determined   to  contain  any   information   that  is  inaccurate  or
          misleading,   the   relevant   Underwriter   (whether   or  not   such
          Computational  Materials  or  ABS  Term  Sheets  are  provided  to the
          Depositor  or  filed  by the  Depositor  with  the  Commission)  shall
          promptly  prepare and deliver to the  Depositor  and each  prospective
          investor  which  received such  information,  corrected  Computational
          Materials or ABS Term Sheets, as applicable.  All information provided
          to the Depositor  pursuant to this Section  8(c)(ii) shall be provided
          within the time periods set forth in Section 8(a) hereof.
               (iii) The  Underwriters  represent  and warrant to the  Depositor
          that the  Underwriters  have taken all necessary and required steps to
          ensure  that  no  written   material  of  any  kind  relating  to  the
          Certificates (or any certificates similar to the Certificates) will be
          delivered to potential investors other than Computational Materials or
          ABS Term Sheets required to be filed pursuant to the No-Action Letters
          and that all  Computational  Materials  and ABS  Term  Sheets  will be
          provided to the Depositor,  and to ensure that all such  Computational
          Materials and ABS Term Sheets are accurate and not misleading.
               (iv)  The  Underwriters  covenant  with  the  Depositor  that all
          Computational  Materials and ABS Term Sheets  delivered to prospective
          investors  shall  contain  a  legend  substantially  to the  following
          effect:
                "THIS  INFORMATION  IS FURNISHED TO YOU SOLELY BY [CREDIT SUISSE
                FIRST BOSTON  CORPORATION] AND/OR THE OTHER UNDERWRITERS AND NOT
                BY [CREDIT SUISSE FIRST BOSTON MORTGAGE  SECURITIES  CORP.] (THE
                "DEPOSITOR") OR ANY OF ITS AFFILIATES (OTHER THAN [CREDIT SUISSE
                FIRST BOSTON  CORPORATION]  IN ITS CAPACITY AS AN  UNDERWRITER).
                THE  UNDERWRITERS  ARE NOT ACTING AS AGENTS FOR THE DEPOSITOR OR
                ITS AFFILIATES IN CONNECTION WITH THE PROPOSED TRANSACTION."
               In the case of  Collateral  Term  Sheets,  such legend shall also
          include the following statement:
                                       15
                     "THE INFORMATION CONTAINED HEREIN WILL BE SUPERSEDED BY THE
                DESCRIPTION  OF THE MORTGAGE  POOL  CONTAINED IN THE  PROSPECTUS
                SUPPLEMENT RELATING TO THE CERTIFICATES AND [EXCEPT WITH RESPECT
                TO  THE   INITIAL   COLLATERAL   TERM  SHEET   PREPARED  BY  THE
                UNDERWRITER]   SUPERSEDES  ALL  INFORMATION   CONTAINED  IN  ANY
                COLLATERAL  TERM SHEETS RELATING TO THE MORTGAGE POOL PREVIOUSLY
                PROVIDED BY [___________________] [NAME OF UNDERWRITER]."
               (d)  The  relevant  Underwriter  agrees  to  indemnify  and  hold
          harmless the Depositor, each of the Depositor's officers and directors
          and each  person who  controls  the  Depositor  within the  meaning of
          either the Act or the Exchange Act against any and all losses, claims,
          damages or  liabilities,  joint or  several,  to which they may become
          subject  under the Act,  the Exchange  Act, or other  Federal or State
          statutory law or  regulation,  at common law or otherwise,  insofar as
          such losses,  claims,  damages or  liabilities  (or actions in respect
          thereof)  (i) are  based  on,  result  from or arise  out of:  (A) the
          relevant  Underwriter's use or delivery to any prospective investor in
          the  Certificates  of any  Computational  Materials;  (B) the relevant
          Underwriter's  failure to comply with Sections  8(a) or 8(c);  (C) the
          filing  by the  Depositor  with  the  Commission  of  any  information
          pursuant to the last sentence of Section 5(a); or (ii) arise out of or
          are based upon any untrue  statement or alleged untrue  statement of a
          material fact contained in any information required to be delivered to
          the Depositor  pursuant to a Section 8(a) or 8(c)(ii) hereof, or arise
          out of or are based upon the  omission  or alleged  omission  to state
          therein a material fact required to be stated  therein or necessary to
          make the statements  therein,  in the light of the circumstances under
          which they were made,  not  misleading,  and agrees to reimburse  each
          such  indemnified  party  for any legal or other  expenses  reasonably
          incurred  by  him,  her  or it in  connection  with  investigating  or
          defending  any such loss,  claim,  damage,  liability  or action.  The
          obligations  of  such  Underwriter  under  this  Section  shall  be in
          addition to any liability which such Underwriter may otherwise have.
               The  procedures  set  forth in  Section  7(c)  and 7(d)  shall be
          equally applicable to this Section.
               (e)   Notwithstanding   any  other  provision  herein,   (a)  the
          Underwriter  shall not be required to be responsible for any amount in
          excess of the amount by which the total re-offering price at which the
          Certificates  underwritten  by it and  distributed  and offered to the
          public  exceeds the amount paid hereunder by the  Underwriter  for the
          Certificates.  For the purposes of this Section 8(e), each person,  if
          any, who controls the Underwriter within the meaning of the Securities
          Act or the Exchange Act shall have the same rights to  contribution as
          the  Underwriter  and each director of the Depositor,  each officer of
          the Depositor who signed the Registration Statement,  and each person,
          if  any,  who  controls  the  Depositor  within  the  meaning  of  the
          Securities  Act or the  Exchange  Act  shall  have the same  rights to
          contribution as the Depositor and (b) the relevant  Underwriter agrees
          to pay all costs and expenses of the Depositor  incurred in connection
          with (i) the filing by the Depositor of any Computational  Material or
          ABS Term Sheets
                                       16
          with the Commission  and (ii) any action by the Depositor  against the
          relevant  Underwriter  to enforce  any of its rights set forth in this
          Section, including, without limitation, legal fees and expenses.
     9.  Default  of   Underwriters.   If  any   Underwriter   or   Underwriters
participating  in an offering of  Certificates  default in their  obligations to
purchase Certificates  hereunder and under the Terms Agreement and the aggregate
principal  amount of such  Certificates  which such  defaulting  Underwriter  or
Underwriters  agreed, but failed, to purchase does not exceed [10]% of the total
principal amount of the Certificates set forth in such Terms Agreement,  you may
make  arrangements  satisfactory  to the  Depositor  for  the  purchase  of such
Certificates by other persons,  including any of the Underwriters  participating
in such  offering,  but  regardless  of whether such  arrangements  are made the
non-defaulting  Underwriters  shall remain  obligated  severally to purchase the
Certificates  which they  committed  to  purchase in  accordance  with the terms
hereunder and under the Terms  Agreement.  If any Underwriter or Underwriters so
default and the aggregate principal amount of Certificates with respect to which
such default or defaults occur is more than [10]% of the total principal  amount
of  the  Certificates  set  forth  in  such  Terms  Agreement  and  arrangements
satisfactory  to you and the Depositor for the purchase of such  Certificates by
other persons are not made, this Agreement will terminate  without  liability on
the part of any nondefaulting Underwriter,  except as provided in Section 10. As
used in this Agreement,  the term "Underwriter"  includes any person substituted
for an Underwriter under this Section.  Nothing herein will relieve a defaulting
Underwriter from liability for its default.
     10. Termination of the Obligations of the Underwriters.  The obligations of
the  Underwriters  to purchase the  Certificates  on the Delivery  Date shall be
terminable  by the  Underwriters  if (a) at any time on or prior to the Delivery
Date (i) trading in securities  generally on the New York Stock  Exchange  shall
have been suspended or materially  limited, or there shall have been any setting
of minimum  prices for trading on such  exchange,  (ii) a general  moratorium on
commercial  banking  activities  in New York shall have been  declared by either
Federal or New York State  authorities,  (iii)  there  shall have  occurred  any
material outbreak or escalation of hostilities or other calamity or crisis,  the
effect of which on the financial markets of the United States is such as to make
it, in your judgment as  representative  of the  Underwriters,  impracticable to
consummate the transactions  contemplated  herein or is such as would materially
and  adversely  affect  the  marketability  of  or  the  market  price  for  the
Certificates  or (iv) any  change or any  development  involving  a  prospective
change,  materially and adversely  affecting (A) the Trust Fund taken as a whole
or (B) the  business or  properties  of the  Depositor  occurs,  which,  in your
reasonable judgment as representative of the Underwriters, in the case of either
clause (A) or (B), materially impairs the investment quality of the Certificates
or (b) any representation or warranty of another party shall be incorrect in any
material respect.
     11. Survival of Certain  Representations  and  Obligations.  The respective
indemnities, agreements, representations, warranties and other statements by the
Depositor or its officers and of the  Underwriters set forth in or made pursuant
to this  Agreement  will  remain in full  force and  effect,  regardless  of any
investigation,  or statement as to the results thereof,  made by or on behalf of
the  Underwriters,  the  Depositor  or any of its  officers or  directors or any
controlling   person,   and  will  survive   delivery  of  and  payment  of  the
Certificates.
                                       17
     If this Agreement is terminated  pursuant to Section 9 or if for any reason
the purchase of the  Certificates by the  Underwriters is not  consummated,  the
Depositor shall remain  responsible for the expenses to be paid or reimbursed by
them  pursuant to Section  5(g),  and the  obligations  of the Depositor and the
Underwriters pursuant to Sections 7 and 8 shall remain in effect.
     12. Notices.  All communications  hereunder will be in writing and, if sent
to an Underwriter will be mailed,  delivered or telegraphed and confirmed to you
at  [Eleven  ▇▇▇▇▇▇▇  ▇▇▇▇▇▇,  ▇▇▇  ▇▇▇▇,  ▇▇▇  ▇▇▇▇  ▇▇▇▇▇]  or if  sent to the
Depositor,  will be mailed,  delivered  or  telegraphed  and  confirmed to it at
[Eleven  ▇▇▇▇▇▇▇  ▇▇▇▇▇▇,  ▇▇▇  ▇▇▇▇,  ▇▇▇  ▇▇▇▇  ▇▇▇▇▇  Attention:  President];
provided,  however, that any notice to an Underwriter pursuant to Section 7 or 8
will be mailed,  delivered or  telegraphed  to such  Underwriter  at the address
furnished by it.
     13.  Successors.  This Agreement and the Terms  Agreement will inure to the
benefit  of  and be  binding  upon  the  parties  hereto  and  their  respective
successors and the officers,  directors and controlling  persons  referred to in
Sections 7 and 8, and their  successors  and  assigns,  and no other person will
have any right or obligations hereunder.
     14.   Representation  of  Underwriters.   You  will  act  for  the  several
Underwriters  set forth in the applicable Terms Agreement in connection with the
transactions  described  in this  Agreement  and such Terms  Agreement,  and any
action  taken  by you  under  this  Agreement  will  be  binding  upon  all  the
Underwriters.
     15.  Applicable  Law. THIS  AGREEMENT  WILL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH  THE  LAWS OF THE  STATE  OF NEW  YORK  WITHOUT  REGARD  TO THE
PRINCIPLES OF CONFLICTS OF LAWS.
     16.  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of which  shall be  deemed to be an  original,  but all such
counterparts shall together constitute one and the same instrument.
                                       18
     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to us a counterpart hereof,  whereupon,  it will become a
binding agreement among the Depositor and the several Underwriters in accordance
with its terms.
                                Very truly yours,
                             CREDIT SUISSE FIRST BOSTON MORTGAGE
                               SECURITIES CORP.,
                               as Depositor
                             By:________________________________
                                Name:
                                Title:
The  foregoing  Agreement is
hereby confirmed and accepted
as of the date first
above written.
CREDIT SUISSE FIRST BOSTON CORPORATION
as representative of the Underwriters
By:___________________________________
   Name:
   Title:
                                       19
                                                                       EXHIBIT A
              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                   (DEPOSITOR)
        [_____________________] Mortgage-Backed Pass-Through Certificates
                                 Series 200_-___
                                 TERMS AGREEMENT
                               [__________, 200_]
To:                    Credit    Suisse   First    Boston    Mortgage
                       Securities   Corp.,  as  Depositor  under  the
                       Pooling and Servicing  Agreement  dated as of
                       [_______ 1, 20__].
Re:                    Underwriting Agreement dated
                       [___________, 20__].
Title:                 [_______________] Mortgage-Backed Pass-Through
-----                  Certificates  Series  200_-___,
                       [Class A and Class M]
Underwriter:           Credit Suisse First Boston  Corporation is the
-----------            sole Underwriter.
Principal Amount:      $[________] (approximate)
----------------
Pass-Through Rate:     Weighted average pass-through rate.
-----------------
Certificate Rating:
------------------
Servicer:              _____________________  (in such capacity,  the
--------               "Servicer").
Trustee:               _____________________  (in such capacity,  the
-------                "Trustee").
Terms of Sale:         The purchase price payable by the  Underwriter
-------------          for the  [Class  A]  Certificates  is [__]% of
                       the  principal  amount  thereof,  plus accrued
                       interest  at the  Pass-Through  Rate  from the
                       date of initial  issuance.  The purchase price
                       payable by the  Underwriter  for the [Class M]
                       Certificates is [__]% of the principal  amount
                       thereof,   plus   accrued   interest   at  the
                       Pass-Through  Rate  from the  date of  initial
                       issuance  Payment of the purchase  price shall
                       be  in  immediately  available  Federal  funds
                       wired  to such  bank as may be  designated  by
                       the Depositor.
                       The [Class R]  Certificates issued pursuant to
                       the Pooling and Servicing Agreement are not
                       subject to this Agreement.
                                      A-1
Underwriting           Notwithstanding  anything  to the  contrary in
Commissions:           the  Underwriting   Agreement,  no  additional
-----------            underwriting  commission  shall be  payable by
                       the   Depositor   to   the    Underwriter   in
                       connection    with   the   purchase   of   the
                       Certificates.
                       Public offering price and/or method of determin-
                       ing price at which the Underwriter will sell the
                       [Class A] and [Class M] Certificates is at vary-
                       ing prices to be determined at the time of sale
                       in one or more negotiated transactions.
Mortgage Loans:        The  mortgage  loans  (the  "Mortgage  Loans")
--------------         sold by  [__________]  (the  "Seller")  to the
                       Depositor   pursuant  to  the  Mortgage   Loan
                       Purchase  Agreement,  dated as of  [________1,
                       200_],  between the Depositor,  the Seller and
                       the  Underwriter and conveyed by the Depositor
                       to  the  Trust  pursuant  to the  Pooling  and
                       Servicing  Agreement,  dated as of [________1,
                       200_]    (the     "Pooling    and    Servicing
                       Agreement"),  among the Depositor, the Seller,
                       the Servicer and the Trustee.
Distribution Dates:    The  [__]  day  (or,  if  such  day  is  not a
------------------     business  day,  the next  succeeding  business
                       day)   of   each   month,    commencing   with
                       [__________], 20__.
Delivery   Date  and   [______],   New   York   Time,   on  or  about
Location:              [________,  20__],  or at such  other time not
--------               later   than   seven   full    business   days
                       thereafter  as  may  be  agreed  upon,  at the
                       offices of [_____________].
                                      A-2
     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to us a counterpart hereof,  whereupon,  it will become a
binding agreement among the Depositor and the several Underwriters in accordance
with its terms.
                             CREDIT SUISSE FIRST BOSTON CORPORATION,
                             By:____________________________________
                                Name:
                                Title:
Accepted:
CREDIT SUISSE FIRST BOSTON MORTGAGE
SECURITIES CORP.,
as Depositor
By:________________________________
   Name:
   Title: