Document:

EXHIBIT 4.2

                        MORTGAGE LOAN PURCHASE AGREEMENT

            This Mortgage Loan Purchase Agreement (the "Agreement"), dated June
29, 2006, is between Banc of America Mortgage Securities, Inc., a Delaware
corporation (the "Purchaser" or the "Company") and Bank of America, National
Association, a national banking association ("BANA" or the "Seller").

            The Purchaser and the Seller hereby recite and agree as follows:

            1. Defined Terms. Terms used without definition herein shall have
the respective meanings assigned to them in the Pooling and Servicing Agreement
dated June 29, 2006 (the "Pooling and Servicing Agreement"), among the Company,
BANA, as servicer and Wells Fargo Bank, N.A., as trustee (the "Trustee"),
relating to the issuance of the Banc of America Alternative Loan Trust 2006-6
Mortgage Pass-Through Certificates, Series 2006-6 (the "Certificates") or, if
not defined therein, in the underwriting agreement dated June 28, 2006 (the
"Underwriting Agreement"), among the Company, BANA and Banc of America
Securities LLC (the "Underwriter") or in the purchase agreement dated June 29,
2006 (the "Purchase Agreement"), among the Company, BANA and Banc of America
Securities LLC.

            2. Purchase Price; Purchase and Sale. The Seller agrees to sell, and
the Company agrees to purchase, the mortgage loans (the "Mortgage Loans"),
listed in the Mortgage Loan Schedule. The purchase price (the "Purchase Price")
for the Mortgage Loans shall consist of $[              ] payable by the Company
to the Seller on the Closing Date in immediately available funds.

            Upon payment of the Purchase Price, the Seller shall be deemed to
have transferred, assigned, set over and otherwise conveyed to the Company all
the right, title and interest of the Seller in and to the Mortgage Loans,
including all interest and principal received or receivable by the Seller on or
with respect to the Mortgage Loans after the Cut-off Date (and including
scheduled payments of principal and interest due after the Cut-off Date but
received by the Seller on or before the Cut-off Date and Principal Prepayments
received or applied on the Cut-off Date, but not including payments of principal
and interest due on the Mortgage Loans on or before the Cut-off Date), together
with all of the Seller's rights, title and interest in and to the proceeds of
any related title, hazard, primary mortgage, mortgage pool policy or other
insurance policies, but excluding any fees payable by a Mortgagor for the right
to cancel any portion of principal or interest of a BPP Mortgage Loan. The
Company hereby directs the Seller, and the Seller hereby agrees, to deliver to
the Trustee all documents, instruments and agreements required to be delivered
by the Company to the Trustee under the Pooling and Servicing Agreement and such
other documents, instruments and agreements as the Company or the Trustee shall
reasonably request.

            3. Representations and Warranties. The Seller hereby represents and
warrants to the Company that (i) the Company's representations and warranties to
the Trustee pursuant to Section 2.04 of the Pooling and Servicing Agreement
insofar as they relate to the Mortgage Loans are true and correct, as of the
date thereof, and (ii) the Seller has not dealt with any broker, investment
banker, agent or other Person (other than the Company and Banc of America
Securities LLC) who may be entitled to any commission or compensation in
connection with the sale of the Mortgage Loans. The Seller hereby agrees to cure
any breach of such representations and warranties in accordance with the terms
of the Pooling and Servicing Agreement.

            4. Repurchase or Substitution. The Seller hereby agrees to
repurchase any Mortgage Loan (i) for which any document is not delivered, as
provided in paragraph 2 above, (ii) which is found by the Trustee to be
defective in any material respect, as provided in the Pooling and Servicing
Agreement, or (iii) which is discovered at any time not to be in conformance
with the representations and warranties referred to in paragraph 3 above and
which document relating thereto the Seller does not deliver or which defect or
breach the Seller does not cure (as provided in paragraph 3 above) within 90
days after the date of notice thereof from the Trustee or the Company, at a
price equal to the then unpaid principal balance thereof, plus accrued and
unpaid interest at the applicable Mortgage Interest Rate, through the last day
of the month in which such repurchase takes place. In addition, the Seller
hereby agrees to reimburse the Purchaser for any Reimbursement Amount.
Alternatively, the Seller hereby agrees, if so requested by the Company, to
substitute for any such Mortgage Loan, a new mortgage loan having
characteristics such that the representations and warranties referred to in
paragraph 3 above would not have been incorrect (except for representations and
warranties as to the correctness of the Mortgage Loan Schedule) had such
substitute mortgage loan originally been a Mortgage Loan. The Seller further
agrees that a substituted mortgage loan will have on the date of substitution
the criteria set forth in the definition of "Substitute Mortgage Loan" in the
Pooling and Servicing Agreement. The Seller shall remit to the Company, in cash,
the difference between the unpaid principal balance of the Mortgage Loan to be
substituted and the unpaid principal balance of the substitute mortgage loan.

            5. BPP Mortgage Loans. With respect to any BPP Mortgage Loan, the
Seller hereby agrees to remit to the Trustee, on behalf of the Trust, as
assignee of the Company (a) the amount of any principal and interest due by a
Mortgagor and cancelled for any month pursuant to the terms of the related
Mortgage Note (the "Monthly Covered Amount") upon the disability or involuntary
unemployment of the related Mortgagor or (b) the outstanding principal balance
of the Mortgage Loan cancelled pursuant to the terms of the related Mortgage
Note together with accrued interest at the Mortgage Interest Rate minus the
Servicing Fee Rate to the date of cancellation (the "Total Covered Amount") upon
the accidental death of the related Mortgagor. Any Monthly Covered Amount
payable by the Seller pursuant to clause (a) this Section 5 shall be deposited
by the Seller in the Servicer Custodial Account on or prior to, in the case of
the Monthly Covered Amount, the Remittance Date relating to the Distribution
Date immediately following the Due Date as to which such Monthly Covered Amount
relates and, in the case of a Total Covered Amount, the Remittance Date relating
to the Distribution Date in the month following the month in which the
cancellation to which such Total Covered Amount relates occurs.

            6. Underwriting. The Seller hereby agrees to furnish any and all
information, documents, certificates, letters or opinions with respect to the
mortgage loans, reasonably requested by the Company in order to perform any of
its obligations or satisfy any of the conditions on its part to be performed or
satisfied pursuant to the Underwriting Agreement or the Purchase Agreement at or
prior to the Closing Date.

            7. Costs. The Company shall pay all expenses incidental to the
performance of its obligations under the Underwriting Agreement and the Purchase
Agreement, including without limitation (i) any recording fees or fees for title
policy endorsements and continuations, (ii) the expenses of preparing, printing
and reproducing the Prospectus, the Prospectus Supplement, the Underwriting
Agreement, the Private Placement Memorandum, the Purchase Agreement, the Pooling
and Servicing Agreement and the Certificates and (iii) the cost of delivering
the Certificates to the offices of Banc of America Securities LLC insured to the
satisfaction of Banc of America Securities LLC.

            8. Notices. All demands, notices and communications hereunder shall
be in writing, shall be effective only upon receipt and shall, if sent to the
Company, be addressed to it at Banc of America Mortgage Securities, Inc., 214
North Tryon Street, Charlotte, North Carolina, 28255, Attention: General Counsel
with a copy to the Chief Financial Officer, or if sent to BANA, be addressed to
it at Bank of America, National Association, 101 South Tryon Street, Charlotte,
North Carolina, 28255, Attention: General Counsel with a copy to the Treasurer.

            9. Trustee Beneficiary. The representations, warranties and
agreements made by the Seller in this Agreement are made for the benefit of, and
may be enforced by, the Trustee and the Holders of Certificates to the same
extent that the Trustee and the Holders of Certificates, respectively, have
rights against the Company under the Pooling and Servicing Agreement in respect
of representations, warranties and agreements made by the Company therein.

            10. Recharacterization. The parties to this Agreement intend the
conveyance by the Seller to the Purchaser of all of its right, title and
interest in and to the Mortgage Loans pursuant to this Agreement to constitute a
purchase and sale and not a loan. Notwithstanding the foregoing, to the extent
that such conveyance is held not to constitute a sale under applicable law, it
is intended that this Agreement shall constitute a security agreement under
applicable law and that the Seller shall be deemed to have granted to the
Purchaser a first priority security interest in all of the Seller's right, title
and interest in and to the Mortgage Loans.

            11. Miscellaneous. This Agreement shall be governed by and construed
in accordance with the laws of the State of New York without regard to the
conflict of law provisions. Neither this Agreement nor any term hereof may be
changed, waived, discharged or terminated except by a writing signed by the
party against whom enforcement of such change, waiver, discharge or termination
is sought. This Agreement may not be changed in any manner which would have a
material adverse effect on Holders of Certificates without the prior written
consent of the Trustee. The Trustee shall be protected in consenting to any such
change to the same extent provided in Article IX of the Pooling and Servicing
Agreement. This Agreement may be signed in any number of counterparts, each of
which shall be deemed an original, which taken together shall constitute one and
the same instrument. This Agreement shall bind and inure to the benefit of and
be enforceable by the Company and the Seller and their respective successors and
assigns.

<PAGE>

            IN WITNESS WHEREOF, the Company and the Seller have caused this
Agreement to be duly executed by their respective officers as of the day and
year first above written.

                                       BANC OF AMERICA MORTGAGE SECURITIES, INC.

                                       By: /s/ Judy Lowman
                                          ----------------------------
                                          Name:  Judy Lowman
                                          Title: Senior Vice President

                                       BANK OF AMERICA, NATIONAL ASSOCIATION

                                       By: /s/ Stephen A. Cummings
                                          ----------------------------
                                          Name:  Stephen A. Cummings
                                          Title: Senior Vice PresidentBANK OF AMERICA, N.A.

TO:         Banc of America Alternative Loan Trust 2006-6
            C/o Wells Fargo Bank, N.A., as Trustee

            Wells Fargo Bank, N.A. as Trustee on behalf of Banc of America
            Alternative Loan Trust 2006-6
            9062 Old Annapolis Road
            Columbia, MD 21046

ATTN:       Chris Regnier
TEL:        410-884-2000
FAX:        410-715-2380

CC:         Eric Daouphars
            9 West 57th Street
            New York, NY 10019
            212-583-8199

FROM:       Bank of America, National Association
            233 South Wacker Drive, 28th Floor
            Chicago, Illinois 60606
            Attention: Suzanne Buchta

DATE:       25th June 2006

Our Reference Numbers:        4664376   46674375
Internal Tracking Numbers:    13976106 13976105

Dear Sir/Madam,

      The purpose of this letter agreement is to confirm the terms and
conditions of the transaction entered into between Banc of America Alternative
Loan Trust 2006-6 and Bank of America, N.A., a national banking association
organized under the laws of the United States of America (each a "party" and
together "the parties") on the Trade Date specified below (the "Transaction").
This letter agreement constitutes a "Confirmation" as referred to in the ISDA
Master Agreement specified in paragraph 1 below. In this Confirmation, "Party A"
means Bank of America, N.A., and "Party B" means Banc of America Alternative
Loan Trust 2006-6.

      The definitions and provisions contained in the 2000 ISDA Definitions, as
published by the International Swaps and Derivatives Association, Inc. (the
"Definitions"), are incorporated into this Confirmation. In the event of any
inconsistency between the Definitions and this Confirmation, this Confirmation
will govern.

      Other capitalized terms used herein (but not otherwise defined) shall have
the meaning specified in that certain Pooling and Servicing Agreement, to be
dated June 29, 2006 (the "Pooling and Servicing Agreement"), among Banc of
America Mortgage Securities, Inc., Bank of America, National Association, as
servicer, and Wells Fargo Bank, N.A., as trustee.

1.    This Confirmation evidences a complete binding agreement between the
parties as to the terms of the Transaction to which this Confirmation relates.
In addition, the parties agree that for the purposes of this Transaction, this
Confirmation will supplement, form a part of, and be subject to an agreement in
the form of the 1992 ISDA Master Agreement (Multicurrency-Cross Border) as if
the parties had executed an agreement in such form (but without any Schedule
except for the elections noted below) on the Trade Date of the Transaction (such
agreement, the "Form Master Agreement"). In the event of any inconsistency
between the provisions of the Form Master Agreement and this Confirmation, this
Confirmation will prevail for the purpose of this Transaction.

      Subject to Section 14 of this Agreement, each party represents to the
other party and will be deemed to represent to the other party on the date on
which it enters into this Transaction that (absent a written agreement between
the parties that expressly imposes affirmative obligations to the contrary for
that Transaction):

      (a) Non-Reliance. Each party has made its own independent decisions to
enter into this Transaction and as to whether this Transaction is appropriate or
proper for it based upon its own judgment and upon advice from such advisors as
it has deemed necessary. It is not relying on any communication (written or
oral) of the other party as investment advice or as a recommendation to enter
into this Transaction; it being understood that information and explanations
related to the terms and conditions of this Transaction shall not be considered
investment advice or a recommendation to enter into this Transaction. Further,
such party has not received from the other party any assurance or guarantee as
to the expected results of this Transaction.

      (b) Evaluation and Understanding. It is capable of evaluating and
understanding (on its own behalf or through independent professional advice),
and understands and accepts, the terms, conditions and risks of this
Transaction. It is also capable of assuming, and assumes, the financial and
other risks of this Transaction.

      (c) Status of Parties. The other party is not acting as an agent,
fiduciary or advisor for it in respect of this Transaction.

2.    The terms of the particular Transaction to which this Confirmation relates
are as follows:

Notional Amount:                    For each Calculation Period, the Notional
                                    Amount shall equal the lesser of:

                                    (i)   the Scheduled Notional Amount for such
                                          Calculation Period as detailed in the
                                          Schedule of Notional Amounts attached
                                          hereto
                                    (ii)  the Class Certificate Balance of the
                                          Class CB-1 Certificates prior to
                                          distributions on the Distribution Date
                                          (as defined in the Pooling and
                                          Servicing Agreement) related to the
                                          Calculation Period. The Trustee shall
                                          make available each month via its
                                          website a statement containing the
                                          Class Certificate Balance of the Class
                                          CB-1 Certificates for such Calculation
                                          Period. The Trustee's internet website
                                          shall initially be located at
                                          www.ctslink.com and assistance in
                                          using the website can be obtained by
                                          calling the Trustee's investor
                                          relations desk at (301) 815-6600.

Trade Date:                         14th June 2006

Effective Date:                     25th June 2006

Termination Date:                   25th August 2010

Fixed Amounts:

Fixed Rate Payer:                   Party B

Fixed Rate Payer
Payment Dates:                      30th June 2006, subject to adjustment in
                                    accordance with the Following Business
                                    Day Convention.

Fixed Amount:                       USD [           ]

Floating Amounts:

Floating Rate Payer:                Party A

Cap Rate I:                         5.35000 per cent

Cap Rate II:                        8.85000 per cent

Floating Rate Payer Payment
Dates:                              Early Payments shall be applicable - 2
                                    Business Day prior to each Floating Rate
                                    Payer Period
                                    End Date

Floating Rate Payer
Period End Dates:                   The 25th of each Month, commencing on 25
                                    July 2006 and ending on the Termination
                                    Date. No Adjustment.

Floating Amount:                    The product of (a) the Notional Amount
                                    (b) the Floating Rate Day Count Fraction
                                    and (c) the Settlement Spread which shall
                                    be calculated in accordance with the
                                    following formula:

                                    If USD-LIBOR-BBA is greater than the Cap
                                    Rate I for the applicable Calculation
                                    Period, then Settlement Spread =
                                    (USD-LIBOR-BBA - applicable Cap Rate I)
                                    provided, however, that if USD-LIBOR-BBA for
                                    any Calculation Period is greater than the
                                    Cap Rate II then the USD-LIBOR-BBA for such
                                    Calculation Period shall be deemed to be the
                                    Cap Rate II.

                                    If 1 Month USD-LIBOR-BBA is less than or
                                    equal to the Cap Rate I for the applicable
                                    Calculation Period, then Settlement Spread =
                                    Zero.

Floating Rate for initial
Calculation Period:                 To be determined

Floating Rate Option:               USD-LIBOR-BBA

Designated Maturity:                1 month

Spread:                             None

Floating Rate Day
Count Fraction:                     30/360

Reset Dates:                        First day of each Calculation Period.

Business Days:                      New York

Calculation Agent:                  Party A

3.    Form Master Agreement.

      (a) "Specified Entity" means, in relation to Party A, for the purpose of
Section 5(a)(v), Section 5(a)(vi), Section 5(a)(vii) and Section 5(b)(iv): Not
Applicable.

      (b) "Specified Entity" means, in relation to Party B, for the purpose of
Section 5(a)(v), Section 5(a)(vi), Section 5(a)(vii) and Section 5(b)(iv): Not
Applicable.

      (c) "Specified Transaction" will have the meaning specified in Section 14
of the Form Master Agreement.

      (d) The "Credit Event Upon Merger" provisions of Section 5(b)(iv) of the
Form Master Agreement will not apply to Party A or to Party B.

      (e) The "Automatic Early Termination" provision of Section 6(a) of the
Form Master Agreement will not apply to Party A or to Party B.

      (f) The Form Master Agreement will be governed by, and construed in
accordance with, the laws of the State of New York without reference to its
conflict of laws provisions (except for Sections 5-1401 and 5-1402 of the New
York General Obligations Law).

      (g) The phrase "Termination Currency" means United States Dollars.

      (h) For the purpose of Section 6(e) of the Form Master Agreement, Market
Quotation and Second Method will apply.

4.    Recording of Conversations.

      Each party to this Transaction acknowledges and agrees to the tape (and/or
other electronic) recording of conversations between the parties to this
Transaction whether by one or other or both of the parties or their agents, and
that any such recordings may be submitted in evidence in any Proceedings
relating to the Form Master Agreement and/or this Transaction.

5.    Credit Support Document.

      In relation to Party A: Not Applicable.
      In relation to Party B: Not Applicable.

6.    Credit Support Provider.

      In relation to Party A: Not Applicable.
      In relation to Party B: Not Applicable.

7.    Account Details.

          Account for payments to Party A:
                    USD
          NAME:     BANK OF AMERICA NA
          CITY:     NEW YORK
          ABA #:    026009593
          ATTN:     BOFAUS3N
          NAME:     BANK OF AMERICA NA
          CITY:     CHARLOTTE
          ACCT:     6550219386
          ATTN:     RATE DERIVATIVE SETTLEMENTS
          ATTN:     BOFAUS6SGDS

      Account for payments to Party B:

         NAME:       Wells Fargo Bank, N.A.
         CITY:       San Francisco, CA
         ABA #:      121-000-248
         ACCT:       3970771416
         FOR CREDIT TO:  SAS CLEARING
         FFC:        BOALT 2006-6 Reserve Fund #50926001

8.    Offices.

      The Office of Party A for this Transaction is:   Charlotte, North Carolina
                                                       Please send notices to
                                                       fax no. (+1) 866 218 8487

      The Office of Party B for this Transaction is:   Wells Fargo Bank, N.A. as
                                                       Trustee on behalf of Banc
                                                       of America Alternative
                                                       Loan Trust 2006-6
                                                       9062 Old Annapolis Road
                                                       Columbia, MD 21045
                                                       Attn: Corporate Trust
                                                             Services
                                                       BOALT 2006-6

9.    Additional Provisions.

      (a) Fully-Paid Transactions. Notwithstanding the terms of Sections 5 and 6
of the Form Master Agreement, if at any time and so long as one of the parties
to the Form Master Agreement ("X") shall have satisfied in full all its payment
and delivery obligations under Section 2(a)(i) of the Form Master Agreement and
shall at the time have no future payment or delivery obligations, whether
absolute or contingent, under such Section, then unless the other party ("Y") is
required pursuant to appropriate proceedings to return to X or otherwise returns
to X (upon demand of X, or otherwise) any portion of any such payment or
delivery: (i) the occurrence of an event described in Section 5(a)(i) of the
Form Master Agreement with respect to X shall not constitute an Event of Default
or a Potential Event of Default with respect to X as the Defaulting Party; and
(ii) Y shall be entitled to designate an Early Termination Date (a) pursuant to
Section 10 below and/or (b) pursuant to Section 6 of the Form Master Agreement
only as a result of the occurrence of a Termination Event set forth in (i)
either Section 5(b)(i) or 5(b)(ii) or 5(b)(v) of the Form Master Agreement with
respect to Y as the Affected Party or (ii) Section 5(b)(iii) of the Form Master
Agreement with respect to Y as the Burdened Party.

      (b) Downgrade of Party A. If a Ratings Event (as defined below) shall
occur and be continuing with respect to Party A, then Party A shall (A) within 5
Business Days of such Ratings Event, give notice to Party B of the occurrence of
such Ratings Event, and (B) use reasonable efforts to transfer (at its own cost)
Party A's rights and obligations hereunder to another party, subject to
satisfaction of the Rating Agency Condition (as defined below). Unless such a
transfer by Party A has occurred within 20 Business Days after the occurrence of
a Ratings Event, Party B shall demand that Party A post Eligible Collateral (as
designated in the approved Credit Support Annex), to secure Party B's exposure
or potential exposure to Party A, and such Eligible Collateral shall be provided
in accordance with a Credit Support Annex to be attached hereto and made a part
hereof within 10 Business Days of Party B's demand therefor. The Eligible
Collateral to be posted and the Credit Support Annex to be executed and
delivered shall be subject to the Rating Agency Condition. Valuation and posting
of Eligible Collateral shall be made as of each Payment Date, unless Party A or
Bank of America Corporation are no longer reporting financial information
publicly, then such valuation and posting must occur weekly. Notwithstanding the
addition of the Credit Support Annex and the posting of Eligible Collateral,
Party A shall continue to use reasonable efforts to transfer its rights and
obligations hereunder to an acceptable third party; provided, however, that
Party A's obligations to find a transferee and to post Eligible Collateral under
such Credit Support Annex shall remain in effect only for so long as a Ratings
Event is continuing with respect to Party A. For the purpose hereof, a "Ratings
Event" shall occur with respect to Party A if the long-term and short-term
senior unsecured deposit ratings of Party A cease to be at least AA- and A-1 by
Standard & Poor's Ratings Service ("S&P") and at least Aa3 and P-1 by Moody's
Investors Service, Inc. ("Moody's") and at least AA- and F1 by Fitch Ratings
("Fitch"), to the extent such obligations are rated by S&P, Moody's and Fitch.
"Rating Agency Condition" means, with respect to any action taken or to be
taken, a condition that is satisfied when S&P, Moody's and Fitch have confirmed
that such action would not result in the downgrade, qualification (if
applicable) or withdrawal of the rating then assigned by such Rating Agency to
the applicable class of Certificates. The failure by Party A to post Eligible
Collateral in accordance herewith or to transfer its rights and obligations
hereunder shall constitute an Additional Termination Event for which Party A
shall be the sole Affected Party.

10.   Additional Termination Event.

      It shall be an Additional Termination Event if any amendment and/or
supplement to any document that pertains to the Form Master Agreement and/or
this Transaction is made without the prior written consent of Party A (such
consent not to be unreasonably withheld), if such amendment and/or supplement
would: (i) adversely affect any of Party A's rights or obligations hereunder
and/or under the Form Master Agreement; or (ii) modify the obligations of, or
impair the ability of, Party B to fully perform any of Party B's obligations
hereunder and/or under the Form Master Agreement. In connection with such
Additional Termination Event, Party B shall be the sole Affected Party.

11.   Waiver of Right to Trial by Jury.

      EACH PARTY HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL BY JURY
WITH RESPECT TO ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS
TRANSACTION.

12.   Eligible Contract Participant.

      Each party represents to the other party that it is an "eligible contract
participant" as defined in Section 1a(12) of the U.S. Commodity Exchange Act, as
amended.

13.   Notice by Facsimile Transmission.

      Section 12(a) of the Form Master Agreement is hereby amended by deleting
the parenthetical "(except that a notice or other communication under Section 5
or 6 may not be given by facsimile transmission or electronic messaging
system)."

14.   Representations.

      Wells Fargo Bank, N.A., acting on behalf of Party B, as trustee,
represents that: (a) it is duly organized and validly existing as a national
banking association under the laws of the jurisdiction of its
organization/formation; (b) it has been directed pursuant to the Pooling
Agreement to enter into this Transaction (including the Form Master Agreement)
and to perform its obligations hereunder (and thereunder); (c) the Transaction
and the performance of its obligations hereunder (and under the Form Master
Agreement) do not violate any material obligation of such Party; (d) each of the
Pooling and Servicing Agreement and the other transaction documents related
thereto (the "Transaction Documents") to which it is a party has been duly
authorized, executed and delivered by it; (e) assuming the due authorization,
execution and delivery thereof by the other parties thereto, each of the Pooling
and Servicing Agreement and the other Transaction Documents to which it is a
party constitutes the legal, valid and binding obligations of it, enforceable
against it in accordance with the terms thereof, subject to applicable
bankruptcy, insolvency and similar laws or legal principles affecting creditors'
rights generally; (f) the Pooling and Servicing Agreement and the other
Transaction Documents to which Party B is a party are in full force and effect
on the date hereof and there have been no amendments or waivers or modifications
of any of the terms thereof since the original execution and delivery of the
Pooling and Servicing Agreement and the other Transaction Documents to which
Party B is a party, except such as may have been delivered to Party A and to
Party B; (g) to its knowledge, no event of default (or event which would, with
the passage of time or the giving of notice, or both, constitute an event of
default) has occurred under any of the Transaction Documents to which Party B is
a party; and (h) the person executing this Confirmation is duly authorized to
execute and deliver it on behalf of Party B.

15.   Multibranch Party.

      For purpose of Section 10(c) of the Form Master Agreement: (a) Party A is
a Multibranch Party, and may act through its Charlotte, North Carolina, Chicago,
Illinois, San Francisco, California, New York, New York, Boston, Massachusetts
or London, England Office or such other Office as may be agreed to by the
parties in connection with a Transaction; and (b) Party B is not a Multibranch
Party.

16.   Other Provisions.

      (a) Addresses for notices. As set forth on page 1 hereof and, with respect
to Party A, the fax no. set forth on the signature page to this letter
agreement.

      (b) For the purpose of Section 13(c) of the Form Master Agreement: (i)
Party A appoints as its Process Agent, not applicable; and (ii) Party B appoints
as its Process Agent, not applicable.

      (c) Section 12(a)(ii) of the Form Master Agreement is deleted in its
entirety.

      (d) Party A may assign its rights and obligations hereunder to any entity
so long as the Rating Agency Confirmation is satisfied.

      (e) USA PATRIOT Act Notice. Party A hereby notifies Party B that pursuant
to the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed
into law October 26, 2001)) (the "Act"), it is required to obtain, verify and
record information that identifies Party B, which information includes the name
and address of Party B and other information that will allow Party A to identify
Party B in accordance with the Act.

      (f) It is expressly understood and agreed by the parties hereto that
insofar as this Confirmation is executed by the Trustee (i) this Confirmation is
executed and delivered by Wells Fargo Bank, N.A., not in its individual capacity
but solely as Trustee under the Pooling and Servicing Agreement in the exercise
of the powers and authority conferred and vested in it thereunder, (ii) each of
the representations, undertakings and agreements herein made on behalf of the
trust formed under the Pooling and Servicing Agreement is made and intended not
as personal representations, undertakings and agreements of the Trustee but is
made and intended solely for the purpose of binding only Banc of America
Alternative Loan Trust 2006-6, and (iii) under no circumstances shall Wells
Fargo Bank, N.A., in its individual capacity be personally liable for the
payment of any indebtedness or expenses or be personally liable for the breach
or failure of any obligation, representation, warranty or covenant made or
undertaken by it on behalf of Banc of America Alternative Loan Trust 2006-6
under this Confirmation. Notwithstanding the foregoing (or anything to the
contrary herein), Wells Fargo Bank, N.A. shall be liable for its own fraud,
negligence, willful misconduct and/or bad faith.

      (g) The Events of Default specified under Sections 5(a)(ii) - 5(a)(vi) of
the Form Master Agreement will not apply to either Party A or Party B.

      (h) With respect to Party B only, the provisions of Section 5(a)(vii)
clause 2 of the Form Master Agreement will not be applicable as an Event of
Default.

      (i) Without affecting the provisions of the Form Master Agreement
requiring the calculation of certain net payment amounts, as a result of an
Event of Default or Additional Termination Event or otherwise, all payments
under the Form Master Agreement will be made without setoff.

      (j) Party A agrees that it will not, prior to the date that is one year
and one day from the Trade Date, acquiesce in, petition or otherwise invoke or
cause Party B to invoke the process of any court or governmental authority for
the purpose of commencing or sustaining a case against Party B under any federal
or state bankruptcy, insolvency or similar law or for the purpose of appointing
a receiver, liquidator, assignee, trustee, custodian, sequestrator or other
similar official for Party B or any substantial part of the property of Party B,
or for the purpose of ordering the winding up or liquidation of the affairs of
Party B. Nothing herein (nor in the Form Master Agreement) shall prevent Party A
from participating in any such proceeding once commenced.

      (k) Section 9(b) of the Form Master Agreement is hereby amended by adding
the following at the end of such Section: ", and unless the Rating Agency
Condition is satisfied, unless such amendment clarifies any term or provision,
corrects any inconsistency, cures any ambiguity, or corrects any typographical
error."

      (l) Before any amendment and/or supplement is made to any document that
pertains to the Form Master Agreement and/or any Transaction thereunder, Party B
must first obtain the prior written consent of Party A (such consent not to be
unreasonably withheld) if such amendment and/or supplement would: (a) adversely
affect any of Party A's rights or obligations under the Form Master Agreement;
or (b) modify the obligations of, or impact the ability of, Party B to fully
perform any of Party B's obligations under the Form Master Agreement.

17.   Compliance with Regulation AB. In connection with the Pooling and
Servicing Agreement, the Sponsor has advised Party B that this Confirmation is a
derivative instrument as described in Item 1115 of Regulation AB under the
Securities Act of 1933 and the Securities Exchange Act of 1934, as amended
("Regulation AB"), and not a credit support contract described in Item 1114 of
Regulation AB.

      (a) In accordance with Regulation AB, Party A represents that: (i) the
name of the derivative counterparty is Bank of America, N.A.; (ii) the
organizational form of the derivative counterparty is a national banking
association organized under the laws of the United States; and (iii) the general
character of the business of the derivative counterparty is to be engaged in a
general consumer banking, commercial banking and trust business, offering a wide
range of commercial, corporate, international, financial market, retail and
fiduciary banking services.

      (b) Party A has been advised that Party B (and/or certain affiliates of
Party B) is required under Regulation AB to disclose certain financial
information regarding Party A depending on the applicable "significance
percentage" of this Confirmation, as calculated from time to time in accordance
with Item 1115 of Regulation AB (as discussed in the Pooling and Servicing
Agreement). Party A has been advised by the Sponsor (as defined in the Pooling
and Servicing Agreement) that the applicable "significance percentage" of this
Confirmation is less than 10%, and accordingly, no financial information
regarding Party A need be disclosed at this time in accordance with Item 1115 of
Regulation AB.

      (c) If required, Party A shall provide to Party B the applicable financial
information described under Item 1115(b)(1) or (b)(2), as applicable, of
Regulation AB (the "Reg AB Information") within five (5) Local Business Days of
receipt of a written request for such Reg AB Information by Party B (the
"Response Period"), so long as the Sponsor has advised Party B in good faith,
that such information is required under Regulation AB; provided, however, that
if Party A, in good faith, determines that it is unable to provide the Reg AB
Information within the Response Period, then, subject to the Rating Agency
Condition, Party A shall use reasonable efforts to cause a Reg AB Approved
Entity (as defined below) to replace Party A as party to this Confirmation on
terms substantially similar to this Confirmation prior to the expiration of the
Response Period.

      (d) "Reg AB Approved Entity" means any entity that (i) has the ability to
provide the Reg AB Information and (ii) meets or exceeds the Approved Rating
Thresholds (as defined below). If Party B requests (in writing) the Reg AB
Information from Party A, then Party B shall promptly (and in any event within
two (2) Local Business Days of the date of the request for the Reg AB
Information) provide Party A with a written explanation of how the significance
percentage was calculated.

      (e) "Approved Rating Thresholds" means a long-term and short-term senior
unsecured deposit rating of at least A and A-1 by S&P, A1 and P-1 by Moody's or
A and F1 by Fitch, to the extent such obligations are rated by S&P, Moody's and
Fitch.

<PAGE>

Please confirm that the foregoing correctly sets forth the terms and conditions
of our agreement by returning within three (3) Business Days via telecopier an
executed copy of this Confirmation to the attention of Global FX and Derivative
Operations (fax no.(+1) 866 255 1444). Failure to respond within such period
shall not affect the validity or enforceability of this Transaction, and shall
be deemed to be an affirmation of the terms and conditions contained herein,
absent manifest error.

Yours sincerely,

Bank of America, N.A.

By:    /s/
      ------------------------------------------
      Name:
      Title:

Confirmed as of the date above:

Banc of America Alternative Loan Trust 2006-6

By: Wells Fargo Bank, N.A. not in its individual capacity, but solely as Trustee
on behalf of Banc of America Alternative Loan Trust 2006-6

By:       /s/ Darron C. Woodus
      ------------------------------------------
      Name: Darron C. Woodus
      Title: Assistant Vice President

<PAGE>

                                   SCHEDULE A
                     Our Reference Numbers: 4664376 4664375

     Notional Amount (USD)       Start Date      End Date
         57,621,000.00           6/25/2006       7/25/2006
         55,355,260.00           7/25/2006       8/25/2006
         53,114,409.00           8/25/2006       9/25/2006
         50,898,282.00           9/25/2006       10/25/2006
         48,706,611.00           10/25/2006      11/25/2006
         46,539,135.00           11/25/2006      12/25/2006
         44,395,595.00           12/25/2006      1/25/2007
         42,938,457.00           1/25/2007       2/25/2007
         41,504,744.00           2/25/2007       3/25/2007
         40,094,203.00           3/25/2007       4/25/2007
         38,706,588.00           4/25/2007       5/25/2007
         37,341,651.00           5/25/2007       6/25/2007
         35,999,149.00           6/25/2007       7/25/2007
         34,678,843.00           7/25/2007       8/25/2007
         33,380,492.00           8/25/2007       9/25/2007
         32,103,863.00           9/25/2007       10/25/2007
         30,848,721.00           10/25/2007      11/25/2007
         29,614,837.00           11/25/2007      12/25/2007
         28,401,982.00           12/25/2007      1/25/2008
         27,209,930.00           1/25/2008       2/25/2008
         26,038,459.00           2/25/2008       3/25/2008
         24,887,347.00           3/25/2008       4/25/2008
         23,756,376.00           4/25/2008       5/25/2008
         22,645,330.00           5/25/2008       6/25/2008
         21,553,995.00           6/25/2008       7/25/2008
         20,482,159.00           7/25/2008       8/25/2008
         19,429,613.00           8/25/2008       9/25/2008
         18,396,151.00           9/25/2008       10/25/2008
         17,381,566.00           10/25/2008      11/25/2008
         16,385,658.00           11/25/2008      12/25/2008
         15,408,224.00           12/25/2008      1/25/2009
         14,449,067.00           1/25/2009       2/25/2009
         13,507,991.00           2/25/2009       3/25/2009
         12,584,802.00           3/25/2009       4/25/2009
         11,679,307.00           4/25/2009       5/25/2009
         10,791,317.00           5/25/2009       6/25/2009
         9,920,644.00            6/25/2009       7/25/2009
         9,067,101.00            7/25/2009       8/25/2009
         8,230,506.00            8/25/2009       9/25/2009
         7,410,675.00            9/25/2009       10/25/2009
         6,607,430.00            10/25/2009      11/25/2009
         5,820,591.00            11/25/2009      12/25/2009
         5,049,984.00            12/25/2009      1/25/2010
         4,295,433.00            1/25/2010       2/25/2010
         3,556,767.00            2/25/2010       3/25/2010
         2,833,814.00            3/25/2010       4/25/2010
         2,126,406.00            4/25/2010       5/25/2010
         1,434,377.00            5/25/2010       6/25/2010
          757,560.00             6/25/2010       7/25/2010
           95,794.00             7/26/2010       8/26/2010

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00106-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00106-of-00352.parquet"}]]