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                                                                  EXHIBIT 4.08

                        UNCONDITIONAL GUARANTY AGREEMENT

     THIS UNCONDITIONAL GUARANTY AGREEMENT (this "Guaranty") is executed as of
April 1, 1999, by TIDEL TECHNOLOGIES, INC., a Delaware corporation,
("Guarantor"), for the benefit of CHASE BANK OF TEXAS, N.A. ("Bank").

                                    RECITALS

     1. Pursuant to that certain Credit Agreement (as the same may be amended,
modified, increased, supplemented and/or restated from time to time, the "Loan
Agreement"), dated as of the date hereof and executed by and among Tidel
Engineering, L.P. ("Borrower") Bank and Guarantor, the Bank has agreed to make
certain loans to Borrower in the principal amount set forth therein;

     2. The Bank is willing to make certain loans under the Loan Agreement but
only on the condition, among others, that Guarantor shall have executed and
delivered to Bank, for its benefit, this Guaranty; and

     3. Guarantor will derive substantial direct and indirect benefit from the
making of the loans under the Loan Agreement.

     NOW, THEREFORE, as an inducement to Bank to make certain loans to Borrower,
and to extend such additional credit as Bank may from time to time agree to
extend, and for other good and valuable consideration, the receipt and legal
sufficiency of which are hereby acknowledged, Guarantor, jointly and severally,
hereby agrees as follows:

                                   AGREEMENTS

                                    ARTICLE I

                          NATURE AND SCOPE OF GUARANTY

     Section 1.01. Guaranty of Obligations. Guarantor hereby irrevocably and
unconditionally guarantees to Bank and its successors and assigns the due and
punctual payment of the Obligations (hereinafter defined). Guarantor hereby
irrevocably and unconditionally covenants and agrees that it is liable for the
Obligations as primary obligor.

     Section 1.02. Definition of Obligations. As used herein, the term
"Obligations" means:

             (a) All indebtedness, liabilities, obligations and duties evidenced
by the Revolving Note (as such term is defined in the Loan Agreement), whether
or not Borrower has any recourse liability therefor to Bank and whether or not
the Revolving Note is enforceable against Borrower or any other party liable
thereon;

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             (b) Any and all other indebtedness, liabilities, obligations and
duties of every kind and character of Borrower to Bank arising pursuant to or
related to the Loan Agreement, the Revolving Note, or any loan agreement,
security agreement, collateral document or other document, instrument or
contract executed in connection with the Loan Agreement whether now or hereafter
existing or arising, (but expressly excluding the Term Note (as defined in the
Loan Agreement)) regardless of whether such present or future indebtedness,
liabilities, obligations or duties be direct or indirect, primary or secondary,
joint, several, or joint and several, fixed or contingent, and regardless of
whether such present or future indebtedness, liabilities, obligations or duties
may, prior to their acquisition by Bank, be or have been payable to, or be or
have been in favor of, some other person or have been acquired by Bank in any
transaction with one other than Borrower including further, without limitation,
the "Obligations" as defined in the Loan Agreement (but expressly excluding the
Term Note);

             (c) Any and all renewals, extensions, modifications and increases
of such indebtedness, liabilities, obligations and duties, or any part thereof,
described in items (a) and (b) of this SECTION 1.02; and

             (d) All costs, expenses and fees, including but not limited to
court costs and attorneys' fees, arising in connection with the collection of
any or all amounts, indebtedness, obligations and liabilities of Borrower to
Bank described in items (a) through (c) of this SECTION 1.02 including costs,
expenses and fees arising in connection with the enforcement of this Guaranty.

     Section 1.03. Obligations Not Reduced by Offset. The Obligations, and the
liabilities and obligations of Guarantor to Bank hereunder, shall not be
reduced, discharged or released because or by reason of any existing or future
offset, claim or defense of Borrower, or any other party, against Bank or
against payment of the Obligations, whether such offset, claim or defense arises
in connection with the Obligations (or the transactions creating the
Obligations) or otherwise. Without limiting the foregoing or the Guarantor's
liability hereunder, to the extent that Bank advances funds or extends credit to
Borrower, and does not receive payments or benefits thereon in the amounts and
at the times required or provided by applicable agreements or laws, Guarantor is
absolutely liable to make such payments to (and confer such benefits on) Bank,
on a timely basis.

     Section 1.04. "Borrower" to Include Successors. The term "Borrower" as used
herein shall include any new or successor entity formed as a result of any
merger or reorganization of Borrower, and all other successors and assigns of
Borrower.

     Section 1.05. Payment by Guarantor. The Guarantor shall have the same
rights as Borrower under the Loan Agreement to cure any Event of Default (as
defined in the Loan Agreement) within the time periods, and otherwise in
accordance with the terms, provided in the Loan Agreement. If all or any part of
the Obligations shall not be punctually paid when due, whether at maturity or
earlier by acceleration or otherwise, Guarantor shall, immediately upon demand
by Bank, and without presentment, protest, notice of protest, notice of
non-payment, notice of intention to accelerate or acceleration or any other
notice whatsoever, pay in lawful

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money of the United States of America, the amount due on the Obligations to Bank
at Bank's principal office in Dallas, Texas. Such demand(s) may be made at any
time coincident with or after the time for payment of all or part of the
Obligations, and may be made from time to time with respect to the same or
different items of Obligations. Such demand shall be deemed made, given and
received in accordance with SECTION 5.02 hereof.

     Section 1.06. No Duty to Pursue Others. It shall not be necessary for Bank
(and Guarantor hereby waives any rights which Guarantor may have to require
Bank), in order to enforce such payment by Guarantor, first to (a) institute
suit or exhaust its remedies against Borrower or others liable on the
Obligations or any other person, (b) enforce Bank's rights against any security
which shall ever have been given to secure the Obligations, (c) enforce Bank's
rights against any other guarantors of the Obligations, (d) join Borrower or any
others liable on the Obligations in any action seeking to enforce this Guaranty,
(e) exhaust any remedies available to Bank against any security which shall ever
have been given to secure the Obligations, or (f) resort to any other means of
obtaining payment of the Obligations. Guarantor hereby waives any other rights
of Guarantor provided by Tex. Bus. Comm. Code Ann. Art. 34. Bank shall not be
required to mitigate damages or take any other action to reduce, collect or
enforce the Obligations.

     Section 1.07. Waiver of Notices, etc. Guarantor hereby waives notice of (a)
any loans or advances made by Bank to Borrower, (b) acceptance of this Guaranty,
(c) any amendment or extension of the Loan Agreement, the Revolving Note or of
any other instrument or document pertaining to all or any part of the
Obligations, (d) the execution and delivery by Borrower and Bank of the Loan
Agreement or of Borrower's execution and delivery of any promissory notes or
other documents in connection therewith, (e) Bank's transfer or disposition of
the Obligations, or any part thereof, (f) protest, proof of non-payment or
default by Borrower, or (g) any other action at any time taken or omitted by
Bank, and, generally, all demands and notices of every kind in connection with
this Guaranty, or any documents or agreements evidencing, securing or relating
to any of the Obligations, except as otherwise specifically provided herein.

     Section 1.08. Nature of Guaranty. This Guaranty is an irrevocable,
absolute, continuing guaranty of payment and performance and not a guaranty of
collection. This Guaranty shall continue to be effective with respect to any
Obligations existing or which arise out of commitments made by Bank prior to any
attempted revocation by Guarantor, and as to all renewals and extensions
thereof, in whole or in part, whenever made. The fact that at any time or from
time to time the Obligations may be increased or reduced shall not release,
discharge or reduce the obligation of Guarantor with respect to indebtedness or
obligations of Borrower to Bank thereafter incurred (or other Obligations
thereafter arising). This Guaranty may be enforced by Bank and any subsequent
holder of the Obligations and shall not be discharged by the assignment or
negotiation of all or part of the Obligations.

     Section 1.09. Payment of Expenses. In the event that Guarantor should
breach or fail to timely perform any provisions of this Guaranty, Guarantor
shall, immediately upon demand by Bank, pay Bank all costs and expenses
(including court costs and reasonable attorneys' fees) incurred by Bank in the
enforcement hereof or the preservation of Bank's rights hereunder. The covenant
contained in this SECTION 1.09 shall survive the payment of the Obligations.

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     Section 1.10. Effect of Bankruptcy. In the event that, pursuant to any
insolvency, bankruptcy, reorganization, receivership or other debtor relief law,
or any judgment, order or decision thereunder, Bank must rescind or restore any
payment, or any part thereof, received by Bank in satisfaction of the
Obligations, any prior release or discharge from the terms of this Guaranty
given to Guarantor by Bank shall be without effect, and this Guaranty shall
remain in full force and effect. It is the intention of Guarantor that
Guarantor's obligations hereunder shall not be discharged except by Guarantor's
performance of such obligations and then only to the extent of such performance.

                                   ARTICLE II

              EVENTS AND CIRCUMSTANCES NOT REDUCING OR DISCHARGING
                             GUARANTOR'S OBLIGATIONS

     Guarantor hereby consents and agrees to each of the following, and agrees
that Guarantor's obligations under this Guaranty shall not be released,
diminished, impaired, reduced or adversely affected by any of the following, and
waives any common law, equitable, statutory or other rights and defenses
(including without limitation rights to notice) which Guarantor might otherwise
have as a result of or in connection with any of the following:

     Section 2.01. Modifications, etc. Any renewal, extension, increase,
modification, alteration or rearrangement of all or any part of the Obligations,
or the Loan Agreement, the Revolving Note or any loan agreement, security
agreement, collateral document or other document, instrument, contract or
understanding between Borrower and Bank, or any other parties, pertaining to the
Obligations;

     Section 2.02. Adjustment, etc. Any adjustment, indulgence, forbearance or
compromise that might be granted or given by Bank to Borrower;

     Section 2.03. Condition of Borrower. The insolvency, bankruptcy,
arrangement, adjustment, composition, liquidation, disability, dissolution or
lack of power of Borrower or any other party at any time liable for the payment
of all or part of the Obligations; or any dissolution of Borrower, or any sale,
lease or transfer of any or all of the assets of Borrower, or any changes in the
shareholders of Borrower; or any reorganization of Borrower;

     Section 2.04. Invalidity of Obligations. The invalidity, illegality or
unenforceability of all or any part of the Obligations, the Revolving Note or
any document or agreement executed in connection with the Obligations, for any
reason whatsoever, including without limitation the fact that (a) the
Obligations, or any part thereof, exceeds the amount permitted by law, (b) the
act of creating the Obligations or any part thereof is ultra vires, (c) the
officers or representatives executing the documents creating the Obligations
acted in excess of their authority, (d) the Obligations violate applicable usury
laws, (e) Borrower has valid defenses, claims or offsets (whether at law, in
equity or by agreement) which render the Obligations wholly or partially
uncollectible from Borrower, (f) the creation, performance or repayment of the
Obligations (or

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the execution, delivery and performance of any document or instrument
representing part of the Obligations or executed in connection with the
Obligations, or given to secure the repayment of the Obligations) is illegal,
uncollectible or unenforceable, or (g) the documents or instruments pertaining
to the Obligations have been forged or otherwise are irregular or not genuine or
authentic;

     Section 2.05. Release of Obligors. Any full or partial release of the
liability of Borrower on the Obligations or any part thereof, or of any
co-guarantors, or any other person or entity now or hereafter liable, whether
directly or indirectly, jointly, severally, or jointly and severally, to pay,
perform, guarantee or assure the payment of the Obligations or any part thereof,
it being recognized, acknowledged and agreed by Guarantor that Guarantor may be
required to pay the Obligations in full, without assistance or support of any
other party, and Guarantor has not been induced to enter into this Guaranty on
the basis of a contemplation, belief, understanding or agreement that other
parties will be liable to perform the Obligations, or that Bank will look to
other parties to perform the Obligations;

     Section 2.06. Other Security. The taking or accepting of any other
security, collateral or guaranty, or other assurance of payment, for all or any
part of the Obligations;

     Section 2.07. Release of Collateral, etc. Any release, surrender, exchange,
subordination, deterioration, waste, loss or impairment of any collateral,
property or security, at any time existing in connection with, or assuring or
securing payment of, all or any part of the Obligations;

     Section 2.08. Care and Diligence. The failure of Bank or any other party to
exercise diligence or reasonable care in the preservation, protection,
enforcement, sale or other handling or treatment of all or any part of such
collateral, property or security;

     Section 2.09. Status of Liens. The fact that any collateral, security,
security interest or lien contemplated or intended to be given, created or
granted as security for the repayment of the Obligations shall not be properly
perfected or created, or shall prove to be unenforceable or subordinate to any
other security interest or lien, it being recognized and agreed by Guarantor
that Guarantor is not entering into this Guaranty in reliance on, or in
contemplation of the benefits of, the validity, enforceability, collectibility
or value of any collateral for the Obligations;

     Section 2.10. Offset. The Obligations, and the liabilities and obligations
of Guarantor to Bank hereunder, shall not be reduced, discharged or released
because of or by reason of any existing or future right of offset, claim or
defense of Borrower against Bank, or any other party, or against payment of the
Obligations, whether such right of offset, claim or defense arises in connection
with the Obligations (or the transactions creating the Obligations) or
otherwise;

     Section 2.11. Merger. The reorganization, merger or consolidation of
Borrower into or with any other entity;

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     Section 2.12. Preference. Any payment by Borrower to Bank is held to
constitute a preference under bankruptcy laws, or for any reason Bank is
required to refund such payment or pay such amount to Borrower or someone else;
or

     Section 2.13. Other Actions Taken or Omitted. Any other action taken or
omitted to be taken with respect to the Obligations, or security and collateral
therefor, if any, whether or not such action or omission prejudices Guarantor or
increases the likelihood that Guarantor will be required to pay the Obligations
pursuant to the terms hereof; IT IS THE UNAMBIGUOUS AND UNEQUIVOCAL INTENTION OF
GUARANTOR THAT GUARANTOR SHALL BE OBLIGATED TO PAY THE OBLIGATIONS WHEN DUE,
NOTWITHSTANDING ANY OCCURRENCE, CIRCUMSTANCE, EVENT, ACTION, OR OMISSION
WHATSOEVER, (INCLUDING, WITHOUT LIMITATION, THE UNENFORCEABILITY OF THE NOTE
AGAINST THE BORROWER WHETHER CONTEMPLATED OR UNCONTEMPLATED, AND WHETHER OR NOT
OTHERWISE OR PARTICULARLY DESCRIBED HEREIN, EXCEPT FOR THE FULL AND FINAL
PAYMENT AND SATISFACTION OF THE OBLIGATIONS.

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         To induce Bank to extend credit to Borrower, Guarantor represents and
warrants to Bank that:

         Section 3.01. Familiarity and Reliance. Guarantor is familiar with, and
has independently reviewed books and records regarding the financial condition
of Borrower and the terms of the Revolving Note, Loan Agreement and other Loan
Documents (as defined in the Loan Agreement);

         Section 3.02. No Representation by Bank. Neither Bank nor any other
party has made any representation, warranty or statement to Guarantor in order
to induce Guarantor to execute this Guaranty;

         Section 3.03. Guarantor's Financial Condition. As of the date hereof,
and after giving effect to this Guaranty and the contingent obligation evidenced
hereby, Guarantor is, and will be, solvent, and has and will have assets which,
fairly valued, exceed its obligations, liabilities and debts, and has property
and assets sufficient to satisfy and repay its obligations and liabilities as
they mature;

         Section 3.04. Benefit. Guarantor has received, or will receive, direct
or indirect benefit from the making of this Guaranty and the indebtedness
evidenced by the Revolving Note;

         Section 3.05. Directors' Determination of Benefit. Guarantor's board of
directors, acting pursuant to a duly called and constituted meeting, after
proper notice, or pursuant to a valid unanimous consent, has determined that
this Guaranty directly or indirectly benefits Guarantor and is in its best
interests;

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         Section 3.06. Legality. The execution, delivery and performance by
Guarantor of this Guaranty and the consummation of the transactions contemplated
hereunder (a) have been duly authorized by all necessary corporate and
stockholder action of Guarantor, and (b) do not, and will not, contravene or
conflict with any law, statute or regulation whatsoever to which Guarantor is
subject or constitute a default (or an event which with notice or lapse of time
or both would constitute a default) under, or result in the breach of, any
indenture, mortgage, deed of trust, charge, lien, or any contract, agreement or
other instrument to which Guarantor is a party or which may be applicable to
Guarantor or any of its assets, or violate any provisions of its Articles (or
Certificate) of Incorporation, Bylaws or any other organizational document of
Guarantor; this Guaranty is a legal, valid and binding obligation of Guarantor
and is enforceable in accordance with its terms, except as limited by
bankruptcy, insolvency or other laws of general application relating to the
enforcement of creditors' rights;

         Section 3.07. Organization and Good Standing. Guarantor (a) is, and
will continue to be, a corporation duly organized, validly existing, and in good
standing under the laws of the state in which it is incorporated, and (b)
possesses all requisite power and authority to execute and deliver and comply
with the terms of this Guaranty; and

         Section 3.08. Survival. All representations and warranties made by
Guarantor herein shall survive the execution hereof.

                                   ARTICLE IV

                     SUBORDINATION OF CERTAIN INDEBTEDNESS;
                              WAIVER OF SUBROGATION

         Section 4.01. Subordination of All Guarantor Claims. As used herein,
the term "Guarantor Claims" shall mean all debts and liabilities of Borrower to
Guarantor, whether such debts and liabilities now exist or are hereafter
incurred or arise, or whether the obligations of Borrower thereon be direct,
contingent, primary, secondary, several, joint and several, or otherwise, and
irrespective of whether such debts or liabilities be evidenced by note,
contract, open account, or otherwise, and irrespective of the person or persons
in whose favor such debts or liabilities may, at their inception, have been, or
may hereafter be created, or the manner in which they have been or may hereafter
be acquired by Guarantor. Except as otherwise allowed under the Loan Agreement,
until the Obligations shall be paid and satisfied in full, and in cash as to
monetary Obligations, and Guarantor shall have performed all of its obligations
hereunder, Guarantor shall not receive or collect, directly or indirectly, from
Borrower or any other party any amount upon the Guarantor Claims.

         Section 4.02. Waiver of Subrogation. Unless and until the Obligations
have been paid in full and subject to SECTION 4.07, Guarantor hereby waives and
releases, to the fullest extent permitted by law:

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                 (a) Any and all rights that would result in Guarantor being
         deemed a "creditor", under the United States Bankruptcy Code, of
         Borrower or any other person, on account of payments made or
         obligations performed by Guarantor relating to this Guaranty; and

                 (b) Any claim, right or remedy which Guarantor may now have or
         hereafter acquire against Borrower that arises hereunder and/or from
         the performance by any Guarantor hereunder including, without
         limitation, any claim, remedy or right of subrogation, reimbursement,
         exoneration, contribution, indemnification, or participation in any
         claim, right or remedy of Bank against Borrower or any security which
         now has or hereafter acquires, whether or not such claim, right or
         remedy arises in equity under contract, by statute, under common law or
         otherwise.

         Section 4.03. Claims in Bankruptcy. In the event of receivership,
bankruptcy, reorganization, arrangement, debtor's relief, or other insolvency
proceedings involving Borrower as debtor, Bank shall have the right to prove
their claims in any such proceeding so as to establish their rights hereunder
and receive directly from the receiver, trustee or other court custodian
dividends and payments which would otherwise be payable upon Guarantor Claims.
Guarantor hereby assigns such dividends and payments to Bank.

         Section 4.04. Payments Held in Trust. In the event that,
notwithstanding SECTIONS 4.01, 4.02 and 4.03 above, Guarantor should receive any
funds, payment, claim or distribution which is prohibited by such Sections,
Guarantor agrees to hold in trust for Bank an amount equal to the amount of all
funds, payments, claims or distributions so received, and agrees that it shall
have absolutely no dominion over the amount of such funds, payments, claims or
distributions, except to pay them promptly to Bank, and Guarantor covenants
promptly to pay the same to Bank.

         Section 4.05. Liens Subordinate. Guarantor agrees that any liens,
security interests, judgment liens, charges or other encumbrances upon
Borrower's assets securing payment of the Guarantor Claims shall be and remain
inferior and subordinate to any liens, security interests, judgment liens,
charges or other encumbrances upon Borrower's assets securing payment of the
Obligations, regardless of whether such encumbrances in favor of Guarantor or
Bank presently exist or are hereafter created or attached. Without the prior
written consent of Bank, Guarantor shall not (a) exercise or enforce any
creditor's right it may have against Borrower, or (b) foreclose, repossess,
sequester or otherwise take steps or institute any action or proceedings
(judicial or otherwise, including without limitation the commencement of, or
joinder in, any liquidation, bankruptcy, rearrangement, debtor's relief or
insolvency proceeding) to enforce any liens, mortgages, deeds of trust, security
interest, collateral rights, judgments or other encumbrances on assets of
Borrower held by Guarantor.

         Section 4.06. Notation of Records. All promissory notes, accounts
receivable ledgers or other evidences of the Guarantor Claims accepted by or
held by Guarantor shall contain a specific written notice thereon that the
indebtedness evidenced thereby is subordinated under the terms of this Guaranty.

         Section 4.07. Disgorged Payments. If after receipt of any payment of
all or any part of the Obligations, Bank is for any reason compelled to
surrender such payment to any person or

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entity because such payment is determined to be void or voidable as a
preference, impermissible setoff, or a diversion of trust funds, or for any
reason, this Guaranty shall continue in full force notwithstanding any contrary
action which may have been taken by Bank in reliance upon such payment, and any
such contrary action so taken shall be without prejudice to Bank's rights under
this Guaranty and shall be deemed to have been conditioned upon such payment
having become final and irrevocable.

                                    ARTICLE V

                                  MISCELLANEOUS

         Section 5.01. Waiver. No failure to exercise, and no delay in
exercising, on the part of Bank, any right hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or the exercise of any other right. The rights of Bank
hereunder shall be in addition to all other rights provided by law. No
modification or waiver of any provision of this Guaranty, nor consent to
departure therefrom, shall be effective unless in writing and signed by Bank and
no such consent or waiver shall extend beyond the particular case and purpose
involved. No notice or demand given in any case shall constitute a waiver of the
right to take other action in the same, similar or other instances without such
notice or demand.

         Section 5.02. Notices. Any notices or other communications required or
permitted to be given by this Guaranty must be given in writing and in the
manner and at the addresses set forth in the Loan Agreement, or at such other
address as Guarantor or the Bank shall so designate in writing.

         Section 5.03. Usury Compliance. It is the intention of Borrower,
Guarantor and Bank to conform strictly to applicable usury laws. Accordingly, no
agreements, conditions, provisions or stipulations contained in this Guaranty or
any other instrument, document or agreement between Guarantor or Borrower and
Bank or default of Guarantor or Borrower, or the exercise by Bank of the right
to accelerate the payment of the maturity of principal and interest, or to
exercise any option whatsoever contained in this Guaranty or any other agreement
between Guarantor or Borrower and Bank, or the arising of any contingency
whatsoever, shall entitle Bank to collect, in any event, interest exceeding the
maximum rate of interest permitted by applicable state or federal law in effect
from time to time hereafter (the "Maximum Legal Rate") and in no event shall
Guarantor be obligated to pay interest exceeding such Maximum Legal Rate and all
agreements, conditions or stipulations, if any, which may in any event or
contingency whatsoever operate to bind, obligate or compel Guarantor to pay a
rate of interest exceeding the Maximum Legal Rate, shall be without binding
force or effect, at law or in equity, to the extent only of the excess of
interest over such Maximum Legal Rate. In the event any interest is charged in
excess of the Maximum Legal Rate ("Excess"), Guarantor acknowledges and
stipulates that any such charge shall be the result of an accident and bona fide
error, and such Excess shall be, first, applied to reduce the principal then
unpaid hereunder; second, applied to reduce the Obligations; and third, returned
to Guarantor, it being the intention of the parties hereto not to enter at any
time into a usurious or otherwise illegal relationship. Guarantor

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recognizes that, with fluctuations in the applicable rate on the Obligations and
the Maximum Legal Rate, such an unintentional result could inadvertently occur.
By the execution of this Guaranty, Guarantor covenants that the credit or return
of any Excess shall constitute the acceptance by Guarantor of such Excess.

         Section 5.04. Choice of Law; Forum Selection. This Agreement and the
other Loan Documents are being executed and delivered, and are intended to be
performed in the State of Texas. Except to the extent that the laws of the
United States may apply to the terms of this Agreement or any other Loan
Document, the substantive laws of the State of Texas shall govern the validity,
construction, enforcement and interpretation of this Guaranty. In the event of a
dispute involving this Guaranty, Guarantor irrevocably agrees that venue for
such dispute shall lie in any court of competent jurisdiction in Dallas County,
Texas.

         Section 5.05. Invalid Provisions. In the case any one or more of the
provisions contained in this Guaranty should be invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained therein shall not in any way be affected thereby,
unless such continued effectiveness of this Guaranty, as modified, would be
contrary to the basic understandings and intentions of the parties as expressed
herein.

         Section 5.06. Parties Bound. This Guaranty shall be binding upon and
inure to the benefit of the parties hereto and their respective successors,
assigns and legal representatives; provided, however, that Guarantor may not,
without the prior written consent of Bank, assign any of its rights, powers,
duties or obligations hereunder.

         Section 5.07. Headings. Section headings are for convenience of
reference only and shall in no way affect the interpretation of this Guaranty.

         Section 5.08. Multiple Counterparts. This Guaranty may be executed in
multiple counterparts, all of which taken together shall constitute one and the
same agreement, and any of the parties hereto may execute this Guaranty by
signing any counterpart.

         Section 5.09. Rights and Remedies. If Guarantor becomes liable for any
indebtedness owing by Borrower to Bank, by endorsement or otherwise, other than
under this Guaranty, such liability shall not be in any manner impaired or
affected hereby and the rights of Bank hereunder shall be cumulative of any and
all other rights that Bank may ever have against Guarantor. The exercise by Bank
of any right or remedy hereunder or under any other instrument, or at law or in
equity, shall not preclude the concurrent or subsequent exercise of any other
right or remedy.

         SECTION 5.10. INDEMNITY. GUARANTOR HEREBY AGREES TO INDEMNIFY, HOLD
HARMLESS, AND DEFEND BANK AND ITS DIRECTORS, OFFICERS, AGENTS, COUNSEL AND
EMPLOYEES ("INDEMNIFIED PERSONS") FROM AND AGAINST ANY AND ALL LOSSES,
LIABILITIES, DAMAGES, COSTS, EXPENSES, SUITS, ACTIONS AND PROCEEDINGS ("LOSSES")
EVER SUFFERED OR INCURRED BY ANY INDEMNIFIED PERSON ARISING OUT OF OR RELATING
TO THIS GUARANTY, ANY OTHER LOAN DOCUMENT OR ANY OTHER TRANSACTION CONTEMPLATED
HEREBY AND THEREBY, INCLUDING,

UNCONDITIONAL GUARANTY AGREEMENT - Page 10
(Tidel Technologies, Inc.)
<PAGE>   11

WITHOUT LIMITATION, ANY LOSSES CAUSED BY THE NEGLIGENCE OF SUCH INDEMNIFIED
PERSON, BUT NOT INCLUDING ANY LOSSES CAUSED BY THE GROSS NEGLIGENCE OR WILLFUL
MISCONDUCT OF SUCH INDEMNIFIED PERSON OR THE DEFAULT BY SUCH INDEMNIFIED PERSON
OF SUCH INDEMNIFIED PERSON'S OBLIGATIONS UNDER ANY LOAN DOCUMENT, AND GUARANTOR
SHALL REIMBURSE BANK AND EACH OTHER INDEMNIFIED PERSON FOR ANY EXPENSES
(INCLUDING IN CONNECTION WITH THE INVESTIGATION OF, PREPARATION FOR OR DEFENSE
OF ANY ACTUAL OR THREATENED CLAIM, ACTION OR PROCEEDING ARISING HEREFROM AND
THEREFROM, INCLUDING ANY SUCH COSTS OF RESPONDING TO DISCOVERY REQUESTS OR
SUBPOENAS, REGARDLESS OF WHETHER BANK OR SUCH OTHER INDEMNIFIED PERSON IS A
PARTY THERETO). WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, THIS INDEMNITY
SHALL EXTEND TO ANY CLAIMS ASSERTED AGAINST BANK OR ANY OTHER INDEMNIFIED PERSON
BY ANY PERSON OR ENTITY UNDER ANY ENVIRONMENTAL LAWS OR SIMILAR LAWS BY REASON
OF THE BORROWER'S, GUARANTOR'S OR ANY OTHER PERSON'S OR ENTITY'S FAILURE TO
COMPLY WITH LAWS APPLICABLE TO SOLID OR HAZARDOUS WASTE MATERIALS OR OTHER TOXIC
SUBSTANCES. EACH INDEMNIFIED PERSON MAY SELECT ITS OWN COUNSEL WITH RESPECT TO
ANY LOSSES, IN ADDITION TO THE GUARANTOR'S COUNSEL, AND SHALL BE INDEMNIFIED
THEREFOR HEREUNDER. NOTWITHSTANDING ANY CONTRARY PROVISION OF THIS GUARANTY, THE
OBLIGATIONS OF THE GUARANTOR UNDER THIS SECTION 5.10 SHALL SURVIVE THE PAYMENT
IN FULL OF THE BORROWER'S OBLIGATIONS UNDER THE LOAN AGREEMENT AND THE
TERMINATION OF THE LOAN AGREEMENT AND THIS GUARANTY.

         Section 5.11. Replacement of Prior Guaranty. This Guaranty is given in
renewal, amendment, replacement, and restatement in its entirety (but not in
novation, extinguishment or satisfaction) of that certain Unconditional Guaranty
Agreement dated June 12, 1997, executed by Guarantor, formerly known as American
Medical Technologies, Inc. d/b/a AMT Industries, Inc., for the benefit of Bank,
successor-in-interest to Texas Commerce Bank National Association (the "Prior
Guaranty"). To the extent of any conflict between the terms of this Guaranty and
the terms of the Prior Guaranty, the terms of this Guaranty shall control.

         SECTION 5.12. NOTICE OF FINAL AGREEMENT. THIS GUARANTY CONSTITUTES A
WRITTEN AGREEMENT WHICH REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES. SUCH
WRITTEN AGREEMENT MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS,
OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES RELATING TO THIS GUARANTY.

UNCONDITIONAL GUARANTY AGREEMENT - Page 11
(Tidel Technologies, Inc.)

<PAGE>   12

         EXECUTED as of the day and year first above written.

                                                  GUARANTOR:

                                                  TIDEL TECHNOLOGIES, INC.

                                                  By:-------------------------
                                                        Mark K. Levenick,
                                                        Chief Operating Officer

UNCONDITIONAL GUARANTY AGREEMENT - Page 12
(Tidel Technologies, Inc.)<PAGE>   1
                                                                    EXHIBIT 4.09

                        UNCONDITIONAL GUARANTY AGREEMENT

         THIS UNCONDITIONAL GUARANTY AGREEMENT (this "Guaranty") is executed as
of April 1, 1999, by TIDEL SERVICES, INC., a Delaware corporation,
("Guarantor"), for the benefit of CHASE BANK OF TEXAS, N.A. ("Bank").

                                    RECITALS

         1. Pursuant to that certain Credit Agreement (as the same may be
amended, modified, increased, supplemented and/or restated from time to time,
the "Loan Agreement"), dated as of the date hereof and executed by and among
Tidel Engineering, L.P. ("Borrower"), Bank and Tidel Technologies, Inc., the
Bank has agreed to make certain loans to Borrower in the principal amount set
forth therein;

         2. The Bank is willing to make certain loans under the Loan Agreement
but only on the condition, among others, that Guarantor shall have executed and
delivered to Bank, for its benefit, this Guaranty; and

         3. Guarantor will derive substantial direct and indirect benefit from
the making of the loans under the Loan Agreement.

         NOW, THEREFORE, as an inducement to Bank to make certain loans to
Borrower, and to extend such additional credit as Bank may from time to time
agree to extend, and for other good and valuable consideration, the receipt and
legal sufficiency of which are hereby acknowledged, Guarantor, jointly and
severally, hereby agrees as follows:

                                   AGREEMENTS

                                    ARTICLE I

                          NATURE AND SCOPE OF GUARANTY

         Section 1.01. Guaranty of Obligations. Guarantor hereby irrevocably and
unconditionally guarantees to Bank and its successors and assigns the due and
punctual payment of the Obligations (hereinafter defined). Guarantor hereby
irrevocably and unconditionally covenants and agrees that it is liable for the
Obligations as primary obligor.

         Section 1.02. Definition of Obligations. As used herein, the term
"Obligations" means:

                  (a) All indebtedness, liabilities, obligations and duties
evidenced by the Notes (as such term is defined in the Loan Agreement), whether
or not Borrower has any recourse liability therefor to Bank and whether or not
the Notes are enforceable against Borrower or any other party liable thereon;

UNCONDITIONAL GUARANTY AGREEMENT - Page 1
(TIDEL SERVICES, INC.)

<PAGE>   2

                  (b) Any and all other indebtedness, liabilities, obligations
and duties of every kind and character of Borrower to Bank arising pursuant to
or related to the Loan Agreement, the Notes, or any loan agreement, security
agreement, collateral document or other document, instrument or contract
executed in connection with the Loan Agreement whether now or hereafter existing
or arising, regardless of whether such present or future indebtedness,
liabilities, obligations or duties be direct or indirect, primary or secondary,
joint, several, or joint and several, fixed or contingent, and regardless of
whether such present or future indebtedness, liabilities, obligations or duties
may, prior to their acquisition by Bank, be or have been payable to, or be or
have been in favor of, some other person or have been acquired by Bank in any
transaction with one other than Borrower including further, without limitation,
the "Obligations" as defined in the Loan Agreement;

                  (c) Any and all renewals, extensions, modifications and
increases of such indebtedness, liabilities, obligations and duties, or any part
thereof, described in items (a) and (b) of this SECTION 1.02; and

                  (d) All costs, expenses and fees, including but not limited to
court costs and attorneys' fees, arising in connection with the collection of
any or all amounts, indebtedness, obligations and liabilities of Borrower to
Bank described in items (a) through (c) of this SECTION 1.02 including costs,
expenses and fees arising in connection with the enforcement of this Guaranty.

         Section 1.03. Obligations Not Reduced by Offset. The Obligations, and
the liabilities and obligations of Guarantor to Bank hereunder, shall not be
reduced, discharged or released because or by reason of any existing or future
offset, claim or defense of Borrower, or any other party, against Bank or
against payment of the Obligations, whether such offset, claim or defense arises
in connection with the Obligations (or the transactions creating the
Obligations) or otherwise. Without limiting the foregoing or the Guarantor's
liability hereunder, to the extent that Bank advances funds or extends credit to
Borrower, and does not receive payments or benefits thereon in the amounts and
at the times required or provided by applicable agreements or laws, Guarantor is
absolutely liable to make such payments to (and confer such benefits on) Bank,
on a timely basis.

         Section 1.04. "Borrower" to Include Successors. The term "Borrower" as
used herein shall include any new or successor entity formed as a result of any
merger or reorganization of Borrower, and all other successors and assigns of
Borrower.

         Section 1.05. Payment by Guarantor. The Guarantor shall have the same
rights as Borrower under the Loan Agreement to cure any Event of Default (as
defined in the Loan Agreement) within the time periods, and otherwise in
accordance with the terms, provided in the Loan Agreement. If all or any part of
the Obligations shall not be punctually paid when due, whether at maturity or
earlier by acceleration or otherwise, Guarantor shall, immediately upon demand
by Bank, and without presentment, protest, notice of protest, notice of
non-payment, notice of intention to accelerate or acceleration or any other
notice whatsoever, pay in lawful money of the United States of America, the
amount due on the Obligations to Bank at Bank's

UNCONDITIONAL GUARANTY AGREEMENT - Page 2
(TIDEL SERVICES, INC.)

<PAGE>   3

principal office in Dallas, Texas. Such demand(s) may be made at any time
coincident with or after the time for payment of all or part of the Obligations,
and may be made from time to time with respect to the same or different items of
Obligations. Such demand shall be deemed made, given and received in accordance
with SECTION 5.02 hereof.

         Section 1.06. No Duty to Pursue Others. It shall not be necessary for
Bank (and Guarantor hereby waives any rights which Guarantor may have to require
Bank), in order to enforce such payment by Guarantor, first to (a) institute
suit or exhaust its remedies against Borrower or others liable on the
Obligations or any other person, (b) enforce Bank's rights against any security
which shall ever have been given to secure the Obligations, (c) enforce Bank's
rights against any other guarantors of the Obligations, (d) join Borrower or any
others liable on the Obligations in any action seeking to enforce this Guaranty,
(e) exhaust any remedies available to Bank against any security which shall ever
have been given to secure the Obligations, or (f) resort to any other means of
obtaining payment of the Obligations. Guarantor hereby waives any other rights
of Guarantor provided by Tex. Bus. Comm. Code Ann. Art. 34. Bank shall not be
required to mitigate damages or take any other action to reduce, collect or
enforce the Obligations.

         Section 1.07. Waiver of Notices, etc. Guarantor hereby waives notice of
(a) any loans or advances made by Bank to Borrower, (b) acceptance of this
Guaranty, (c) any amendment or extension of the Loan Agreement, the Notes or of
any other instrument or document pertaining to all or any part of the
Obligations, (d) the execution and delivery by Borrower and Bank of the Loan
Agreement or of Borrower's execution and delivery of any promissory notes or
other documents in connection therewith, (e) Bank's transfer or disposition of
the Obligations, or any part thereof, (f) protest, proof of non-payment or
default by Borrower, or (g) any other action at any time taken or omitted by
Bank, and, generally, all demands and notices of every kind in connection with
this Guaranty, or any documents or agreements evidencing, securing or relating
to any of the Obligations, except as otherwise specifically provided herein.

         Section 1.08. Nature of Guaranty. This Guaranty is an irrevocable,
absolute, continuing guaranty of payment and performance and not a guaranty of
collection. This Guaranty shall continue to be effective with respect to any
Obligations existing or which arise out of commitments made by Bank prior to any
attempted revocation by Guarantor, and as to all renewals and extensions
thereof, in whole or in part, whenever made. The fact that at any time or from
time to time the Obligations may be increased or reduced shall not release,
discharge or reduce the obligation of Guarantor with respect to indebtedness or
obligations of Borrower to Bank thereafter incurred (or other Obligations
thereafter arising). This Guaranty may be enforced by Bank and any subsequent
holder of the Obligations and shall not be discharged by the assignment or
negotiation of all or part of the Obligations.

         Section 1.09. Payment of Expenses. In the event that Guarantor should
breach or fail to timely perform any provisions of this Guaranty, Guarantor
shall, immediately upon demand by Bank, pay Bank all costs and expenses
(including court costs and reasonable attorneys' fees) incurred by Bank in the
enforcement hereof or the preservation of Bank's rights hereunder. The covenant
contained in this SECTION 1.09 shall survive the payment of the Obligations.

UNCONDITIONAL GUARANTY AGREEMENT - Page 3
(TIDEL SERVICES, INC.)

<PAGE>   4

         Section 1.10. Effect of Bankruptcy. In the event that, pursuant to any
insolvency, bankruptcy, reorganization, receivership or other debtor relief law,
or any judgment, order or decision thereunder, Bank must rescind or restore any
payment, or any part thereof, received by Bank in satisfaction of the
Obligations, any prior release or discharge from the terms of this Guaranty
given to Guarantor by Bank shall be without effect, and this Guaranty shall
remain in full force and effect. It is the intention of Guarantor that
Guarantor's obligations hereunder shall not be discharged except by Guarantor's
performance of such obligations and then only to the extent of such performance.

                                   ARTICLE II

              EVENTS AND CIRCUMSTANCES NOT REDUCING OR DISCHARGING
                             GUARANTOR'S OBLIGATIONS

         Guarantor hereby consents and agrees to each of the following, and
agrees that Guarantor's obligations under this Guaranty shall not be released,
diminished, impaired, reduced or adversely affected by any of the following, and
waives any common law, equitable, statutory or other rights and defenses
(including without limitation rights to notice) which Guarantor might otherwise
have as a result of or in connection with any of the following:

         Section 2.01. Modifications, etc. Any renewal, extension, increase,
modification, alteration or rearrangement of all or any part of the Obligations,
or the Loan Agreement, the Notes or any loan agreement, security agreement,
collateral document or other document, instrument, contract or understanding
between Borrower and Bank, or any other parties, pertaining to the Obligations;

         Section 2.02. Adjustment, etc. Any adjustment, indulgence, forbearance
or compromise that might be granted or given by Bank to Borrower;

         Section 2.03. Condition of Borrower. The insolvency, bankruptcy,
arrangement, adjustment, composition, liquidation, disability, dissolution or
lack of power of Borrower or any other party at any time liable for the payment
of all or part of the Obligations; or any dissolution of Borrower, or any sale,
lease or transfer of any or all of the assets of Borrower, or any changes in the
shareholders of Borrower; or any reorganization of Borrower;

         Section 2.04. Invalidity of Obligations. The invalidity, illegality or
unenforceability of all or any part of the Obligations, the Notes or any
document or agreement executed in connection with the Obligations, for any
reason whatsoever, including without limitation the fact that (a) the
Obligations, or any part thereof, exceeds the amount permitted by law, (b) the
act of creating the Obligations or any part thereof is ultra vires, (c) the
officers or representatives executing the documents creating the Obligations
acted in excess of their authority, (d) the Obligations violate applicable usury
laws, (e) Borrower has valid defenses, claims or offsets (whether at law, in
equity or by agreement) which render the Obligations wholly or partially
uncollectible from Borrower, (f) the creation, performance or repayment of the
Obligations (or the execution, delivery and performance of any document or
instrument representing part of the

UNCONDITIONAL GUARANTY AGREEMENT - Page 4
(TIDEL SERVICES, INC.)

<PAGE>   5

Obligations or executed in connection with the Obligations, or given to secure
the repayment of the Obligations) is illegal, uncollectible or unenforceable, or
(g) the documents or instruments pertaining to the Obligations have been forged
or otherwise are irregular or not genuine or authentic;

         Section 2.05. Release of Obligors. Any full or partial release of the
liability of Borrower on the Obligations or any part thereof, or of any
co-guarantors, or any other person or entity now or hereafter liable, whether
directly or indirectly, jointly, severally, or jointly and severally, to pay,
perform, guarantee or assure the payment of the Obligations or any part thereof,
it being recognized, acknowledged and agreed by Guarantor that Guarantor may be
required to pay the Obligations in full, without assistance or support of any
other party, and Guarantor has not been induced to enter into this Guaranty on
the basis of a contemplation, belief, understanding or agreement that other
parties will be liable to perform the Obligations, or that Bank will look to
other parties to perform the Obligations;

         Section 2.06. Other Security. The taking or accepting of any other
security, collateral or guaranty, or other assurance of payment, for all or any
part of the Obligations;

         Section 2.07. Release of Collateral, etc. Any release, surrender,
exchange, subordination, deterioration, waste, loss or impairment of any
collateral, property or security, at any time existing in connection with, or
assuring or securing payment of, all or any part of the Obligations;

         Section 2.08. Care and Diligence. The failure of Bank or any other
party to exercise diligence or reasonable care in the preservation, protection,
enforcement, sale or other handling or treatment of all or any part of such
collateral, property or security;

         Section 2.09. Status of Liens. The fact that any collateral, security,
security interest or lien contemplated or intended to be given, created or
granted as security for the repayment of the Obligations shall not be properly
perfected or created, or shall prove to be unenforceable or subordinate to any
other security interest or lien, it being recognized and agreed by Guarantor
that Guarantor is not entering into this Guaranty in reliance on, or in
contemplation of the benefits of, the validity, enforceability, collectibility
or value of any collateral for the Obligations;

         Section 2.10. Offset. The Obligations, and the liabilities and
obligations of Guarantor to Bank hereunder, shall not be reduced, discharged or
released because of or by reason of any existing or future right of offset,
claim or defense of Borrower against Bank, or any other party, or against
payment of the Obligations, whether such right of offset, claim or defense
arises in connection with the Obligations (or the transactions creating the
Obligations) or otherwise;

         Section 2.11. Merger. The reorganization, merger or consolidation of
Borrower into or with any other entity;

UNCONDITIONAL GUARANTY AGREEMENT - Page 5
(TIDEL SERVICES, INC.)

<PAGE>   6

         Section 2.12. Preference. Any payment by Borrower to Bank is held to
constitute a preference under bankruptcy laws, or for any reason Bank is
required to refund such payment or pay such amount to Borrower or someone else;
or

         Section 2.13. Other Actions Taken or Omitted. Any other action taken or
omitted to be taken with respect to the Obligations, or security and collateral
therefor, if any, whether or not such action or omission prejudices Guarantor or
increases the likelihood that Guarantor will be required to pay the Obligations
pursuant to the terms hereof; IT IS THE UNAMBIGUOUS AND UNEQUIVOCAL INTENTION OF
GUARANTOR THAT GUARANTOR SHALL BE OBLIGATED TO PAY THE OBLIGATIONS WHEN DUE,
NOTWITHSTANDING ANY OCCURRENCE, CIRCUMSTANCE, EVENT, ACTION, OR OMISSION
WHATSOEVER, (INCLUDING, WITHOUT LIMITATION, THE UNENFORCEABILITY OF THE NOTE
AGAINST THE BORROWER WHETHER CONTEMPLATED OR UNCONTEMPLATED, AND WHETHER OR NOT
OTHERWISE OR PARTICULARLY DESCRIBED HEREIN, EXCEPT FOR THE FULL AND FINAL
PAYMENT AND SATISFACTION OF THE OBLIGATIONS.

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         To induce Bank to extend credit to Borrower, Guarantor represents and
warrants to Bank that:

         Section 3.01. Familiarity and Reliance. Guarantor is familiar with, and
has independently reviewed books and records regarding the financial condition
of Borrower and the terms of the Notes, Loan Agreement and other Loan Documents
(as defined in the Loan Agreement);

         Section 3.02. No Representation by Bank. Neither Bank nor any other
party has made any representation, warranty or statement to Guarantor in order
to induce Guarantor to execute this Guaranty;

         Section 3.03. Guarantor's Financial Condition. As of the date hereof,
and after giving effect to this Guaranty and the contingent obligation evidenced
hereby, Guarantor is, and will be, solvent, and has and will have assets which,
fairly valued, exceed its obligations, liabilities and debts, and has property
and assets sufficient to satisfy and repay its obligations and liabilities as
they mature;

         Section 3.04. Benefit. Guarantor has received, or will receive, direct
or indirect benefit from the making of this Guaranty and the indebtedness
evidenced by the Notes;

         Section 3.05. Directors' Determination of Benefit. Guarantor's board of
directors, acting pursuant to a duly called and constituted meeting, after
proper notice, or pursuant to a valid unanimous consent, has determined that
this Guaranty directly or indirectly benefits Guarantor and is in its best
interests;

UNCONDITIONAL GUARANTY AGREEMENT - Page 6
(TIDEL SERVICES, INC.)

<PAGE>   7

         Section 3.06. Legality. The execution, delivery and performance by
Guarantor of this Guaranty and the consummation of the transactions contemplated
hereunder (a) have been duly authorized by all necessary corporate and
stockholder action of Guarantor, and (b) do not, and will not, contravene or
conflict with any law, statute or regulation whatsoever to which Guarantor is
subject or constitute a default (or an event which with notice or lapse of time
or both would constitute a default) under, or result in the breach of, any
indenture, mortgage, deed of trust, charge, lien, or any contract, agreement or
other instrument to which Guarantor is a party or which may be applicable to
Guarantor or any of its assets, or violate any provisions of its Articles (or
Certificate) of Incorporation, Bylaws or any other organizational document of
Guarantor; this Guaranty is a legal, valid and binding obligation of Guarantor
and is enforceable in accordance with its terms, except as limited by
bankruptcy, insolvency or other laws of general application relating to the
enforcement of creditors' rights;

         Section 3.07. Organization and Good Standing. Guarantor (a) is, and
will continue to be, a corporation duly organized, validly existing, and in good
standing under the laws of the state in which it is incorporated, and (b)
possesses all requisite power and authority to execute and deliver and comply
with the terms of this Guaranty; and

         Section 3.08. Survival. All representations and warranties made by
Guarantor herein shall survive the execution hereof.

                                   ARTICLE IV

                     SUBORDINATION OF CERTAIN INDEBTEDNESS;
                              WAIVER OF SUBROGATION

         Section 4.01. Subordination of All Guarantor Claims. As used herein,
the term "Guarantor Claims" shall mean all debts and liabilities of Borrower to
Guarantor, whether such debts and liabilities now exist or are hereafter
incurred or arise, or whether the obligations of Borrower thereon be direct,
contingent, primary, secondary, several, joint and several, or otherwise, and
irrespective of whether such debts or liabilities be evidenced by note,
contract, open account, or otherwise, and irrespective of the person or persons
in whose favor such debts or liabilities may, at their inception, have been, or
may hereafter be created, or the manner in which they have been or may hereafter
be acquired by Guarantor. Except as otherwise allowed under the Loan Agreement,
until the Obligations shall be paid and satisfied in full, and in cash as to
monetary Obligations, and Guarantor shall have performed all of its obligations
hereunder, Guarantor shall not receive or collect, directly or indirectly, from
Borrower or any other party any amount upon the Guarantor Claims.

         Section 4.02. Waiver of Subrogation. Unless and until the Obligations
have been paid in full and subject to SECTION 4.07, Guarantor hereby waives and
releases, to the fullest extent permitted by law:

UNCONDITIONAL GUARANTY AGREEMENT - Page 7
(TIDEL SERVICES, INC.)

<PAGE>   8

                  (a) Any and all rights that would result in Guarantor being
         deemed a "creditor", under the United States Bankruptcy Code, of
         Borrower or any other person, on account of payments made or
         obligations performed by Guarantor relating to this Guaranty; and

                  (b) Any claim, right or remedy which Guarantor may now have or
         hereafter acquire against Borrower that arises hereunder and/or from
         the performance by any Guarantor hereunder including, without
         limitation, any claim, remedy or right of subrogation, reimbursement,
         exoneration, contribution, indemnification, or participation in any
         claim, right or remedy of Bank against Borrower or any security which
         now has or hereafter acquires, whether or not such claim, right or
         remedy arises in equity under contract, by statute, under common law or
         otherwise.

         Section 4.03. Claims in Bankruptcy. In the event of receivership,
bankruptcy, reorganization, arrangement, debtor's relief, or other insolvency
proceedings involving Borrower as debtor, Bank shall have the right to prove
their claims in any such proceeding so as to establish their rights hereunder
and receive directly from the receiver, trustee or other court custodian
dividends and payments which would otherwise be payable upon Guarantor Claims.
Guarantor hereby assigns such dividends and payments to Bank.

         Section 4.04. Payments Held in Trust. In the event that,
notwithstanding SECTIONS 4.01, 4.02 and 4.03 above, Guarantor should receive any
funds, payment, claim or distribution which is prohibited by such Sections,
Guarantor agrees to hold in trust for Bank an amount equal to the amount of all
funds, payments, claims or distributions so received, and agrees that it shall
have absolutely no dominion over the amount of such funds, payments, claims or
distributions, except to pay them promptly to Bank, and Guarantor covenants
promptly to pay the same to Bank.

         Section 4.05. Liens Subordinate. Guarantor agrees that any liens,
security interests, judgment liens, charges or other encumbrances upon
Borrower's assets securing payment of the Guarantor Claims shall be and remain
inferior and subordinate to any liens, security interests, judgment liens,
charges or other encumbrances upon Borrower's assets securing payment of the
Obligations, regardless of whether such encumbrances in favor of Guarantor or
Bank presently exist or are hereafter created or attached. Without the prior
written consent of Bank, Guarantor shall not (a) exercise or enforce any
creditor's right it may have against Borrower, or (b) foreclose, repossess,
sequester or otherwise take steps or institute any action or proceedings
(judicial or otherwise, including without limitation the commencement of, or
joinder in, any liquidation, bankruptcy, rearrangement, debtor's relief or
insolvency proceeding) to enforce any liens, mortgages, deeds of trust, security
interest, collateral rights, judgments or other encumbrances on assets of
Borrower held by Guarantor.

         Section 4.06. Notation of Records. All promissory notes, accounts
receivable ledgers or other evidences of the Guarantor Claims accepted by or
held by Guarantor shall contain a specific written notice thereon that the
indebtedness evidenced thereby is subordinated under the terms of this Guaranty.

         Section 4.07. Disgorged Payments. If after receipt of any payment of
all or any part of the Obligations, Bank is for any reason compelled to
surrender such payment to any person or

UNCONDITIONAL GUARANTY AGREEMENT - Page 8
(TIDEL SERVICES, INC.)

<PAGE>   9

entity because such payment is determined to be void or voidable as a
preference, impermissible setoff, or a diversion of trust funds, or for any
reason, this Guaranty shall continue in full force notwithstanding any contrary
action which may have been taken by Bank in reliance upon such payment, and any
such contrary action so taken shall be without prejudice to Bank's rights under
this Guaranty and shall be deemed to have been conditioned upon such payment
having become final and irrevocable.

                                    ARTICLE V

                                  MISCELLANEOUS

         Section 5.01. Waiver. No failure to exercise, and no delay in
exercising, on the part of Bank, any right hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or the exercise of any other right. The rights of Bank
hereunder shall be in addition to all other rights provided by law. No
modification or waiver of any provision of this Guaranty, nor consent to
departure therefrom, shall be effective unless in writing and signed by Bank and
no such consent or waiver shall extend beyond the particular case and purpose
involved. No notice or demand given in any case shall constitute a waiver of the
right to take other action in the same, similar or other instances without such
notice or demand.

         Section 5.02. Notices. Any notices or other communications required or
permitted to be given by this Guaranty must be given in writing and in the
manner set forth in the Loan Agreement. Any such notices or other communications
must be given to the Bank at the address set forth in the Loan Agreement and to
the Guarantor at the address set forth on the signature page hereto, or at such
other address as Guarantor or the Bank shall so designate in writing.

         Section 5.03. Usury Compliance. It is the intention of Borrower,
Guarantor and Bank to conform strictly to applicable usury laws. Accordingly, no
agreements, conditions, provisions or stipulations contained in this Guaranty or
any other instrument, document or agreement between Guarantor or Borrower and
Bank or default of Guarantor or Borrower, or the exercise by Bank of the right
to accelerate the payment of the maturity of principal and interest, or to
exercise any option whatsoever contained in this Guaranty or any other agreement
between Guarantor or Borrower and Bank, or the arising of any contingency
whatsoever, shall entitle Bank to collect, in any event, interest exceeding the
maximum rate of interest permitted by applicable state or federal law in effect
from time to time hereafter (the "Maximum Legal Rate") and in no event shall
Guarantor be obligated to pay interest exceeding such Maximum Legal Rate and all
agreements, conditions or stipulations, if any, which may in any event or
contingency whatsoever operate to bind, obligate or compel Guarantor to pay a
rate of interest exceeding the Maximum Legal Rate, shall be without binding
force or effect, at law or in equity, to the extent only of the excess of
interest over such Maximum Legal Rate. In the event any interest is charged in
excess of the Maximum Legal Rate ("Excess"), Guarantor acknowledges and
stipulates that any such charge shall be the result of an accident and bona fide
error, and such Excess shall be, first, applied to reduce the principal then
unpaid hereunder; second, applied to reduce the Obligations; and third, returned
to Guarantor, it being the intention of the parties

UNCONDITIONAL GUARANTY AGREEMENT - Page 9
(TIDEL SERVICES, INC.)

<PAGE>   10

hereto not to enter at any time into a usurious or otherwise illegal
relationship. Guarantor recognizes that, with fluctuations in the applicable
rate on the Obligations and the Maximum Legal Rate, such an unintentional result
could inadvertently occur. By the execution of this Guaranty, Guarantor
covenants that the credit or return of any Excess shall constitute the
acceptance by Guarantor of such Excess.

         Section 5.04. Choice of Law; Forum Selection. This Agreement and the
other Loan Documents are being executed and delivered, and are intended to be
performed in the State of Texas. Except to the extent that the laws of the
United States may apply to the terms of this Agreement or any other Loan
Document, the substantive laws of the State of Texas shall govern the validity,
construction, enforcement and interpretation of this Guaranty. In the event of a
dispute involving this Guaranty, Guarantor irrevocably agrees that venue for
such dispute shall lie in any court of competent jurisdiction in Dallas County,
Texas.

         Section 5.05. Invalid Provisions. In the case any one or more of the
provisions contained in this Guaranty should be invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained therein shall not in any way be affected thereby,
unless such continued effectiveness of this Guaranty, as modified, would be
contrary to the basic understandings and intentions of the parties as expressed
herein.

         Section 5.06. Parties Bound. This Guaranty shall be binding upon and
inure to the benefit of the parties hereto and their respective successors,
assigns and legal representatives; provided, however, that Guarantor may not,
without the prior written consent of Bank, assign any of its rights, powers,
duties or obligations hereunder.

         Section 5.07. Headings. Section headings are for convenience of
reference only and shall in no way affect the interpretation of this Guaranty.

         Section 5.08. Multiple Counterparts. This Guaranty may be executed in
multiple counterparts, all of which taken together shall constitute one and the
same agreement, and any of the parties hereto may execute this Guaranty by
signing any counterpart.

         Section 5.09. Rights and Remedies. If Guarantor becomes liable for any
indebtedness owing by Borrower to Bank, by endorsement or otherwise, other than
under this Guaranty, such liability shall not be in any manner impaired or
affected hereby and the rights of Bank hereunder shall be cumulative of any and
all other rights that Bank may ever have against Guarantor. The exercise by Bank
of any right or remedy hereunder or under any other instrument, or at law or in
equity, shall not preclude the concurrent or subsequent exercise of any other
right or remedy.

         SECTION 5.10. INDEMNITY. GUARANTOR HEREBY AGREES TO INDEMNIFY, HOLD
HARMLESS, AND DEFEND BANK AND ITS DIRECTORS, OFFICERS, AGENTS, COUNSEL AND
EMPLOYEES ("INDEMNIFIED PERSONS") FROM AND AGAINST ANY AND ALL LOSSES,
LIABILITIES, DAMAGES, COSTS, EXPENSES, SUITS, ACTIONS AND PROCEEDINGS ("LOSSES")
EVER SUFFERED OR INCURRED BY ANY INDEMNIFIED PERSON ARISING OUT OF OR RELATING
TO THIS GUARANTY, ANY OTHER LOAN DOCUMENT OR ANY OTHER

UNCONDITIONAL GUARANTY AGREEMENT - Page 10
(TIDEL SERVICES, INC.)

<PAGE>   11

TRANSACTION CONTEMPLATED HEREBY AND THEREBY, INCLUDING, WITHOUT LIMITATION, ANY
LOSSES CAUSED BY THE NEGLIGENCE OF SUCH INDEMNIFIED PERSON, BUT NOT INCLUDING
ANY LOSSES CAUSED BY THE GROSS NEGLIGENCE OR WILLFUL MISCONDUCT OF SUCH
INDEMNIFIED PERSON OR THE DEFAULT BY SUCH INDEMNIFIED PERSON OF SUCH INDEMNIFIED
PERSON'S OBLIGATIONS UNDER ANY LOAN DOCUMENT, AND GUARANTOR SHALL REIMBURSE BANK
AND EACH OTHER INDEMNIFIED PERSON FOR ANY EXPENSES (INCLUDING IN CONNECTION WITH
THE INVESTIGATION OF, PREPARATION FOR OR DEFENSE OF ANY ACTUAL OR THREATENED
CLAIM, ACTION OR PROCEEDING ARISING HEREFROM AND THEREFROM, INCLUDING ANY SUCH
COSTS OF RESPONDING TO DISCOVERY REQUESTS OR SUBPOENAS, REGARDLESS OF WHETHER
BANK OR SUCH OTHER INDEMNIFIED PERSON IS A PARTY THERETO). WITHOUT LIMITING THE
GENERALITY OF THE FOREGOING, THIS INDEMNITY SHALL EXTEND TO ANY CLAIMS ASSERTED
AGAINST BANK OR ANY OTHER INDEMNIFIED PERSON BY ANY PERSON OR ENTITY UNDER ANY
ENVIRONMENTAL LAWS OR SIMILAR LAWS BY REASON OF THE BORROWER'S, GUARANTOR'S OR
ANY OTHER PERSON'S OR ENTITY'S FAILURE TO COMPLY WITH LAWS APPLICABLE TO SOLID
OR HAZARDOUS WASTE MATERIALS OR OTHER TOXIC SUBSTANCES. EACH INDEMNIFIED PERSON
MAY SELECT ITS OWN COUNSEL WITH RESPECT TO ANY LOSSES, IN ADDITION TO THE
GUARANTOR'S COUNSEL, AND SHALL BE INDEMNIFIED THEREFOR HEREUNDER.
NOTWITHSTANDING ANY CONTRARY PROVISION OF THIS GUARANTY, THE OBLIGATIONS OF THE
GUARANTOR UNDER THIS SECTION 5.10 SHALL SURVIVE THE PAYMENT IN FULL OF THE
BORROWER'S OBLIGATIONS UNDER THE LOAN AGREEMENT AND THE TERMINATION OF THE LOAN
AGREEMENT AND THIS GUARANTY.

         SECTION 5.11. NOTICE OF FINAL AGREEMENT. THIS GUARANTY CONSTITUTES A
WRITTEN AGREEMENT WHICH REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES. SUCH
WRITTEN AGREEMENT MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS,
OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES RELATING TO THIS GUARANTY.

         EXECUTED as of the day and year first above written.

                                GUARANTOR:

                                TIDEL SERVICES, INC.

                                By:
                                   ---------------------------------------
                                   Andrew Panaccione, Vice President

UNCONDITIONAL GUARANTY AGREEMENT - Page 11
(TIDEL SERVICES, INC.)

<PAGE>   12

                                          Address for Notices:

                                          300 Delaware Avenue, Suite 1704
                                          Wilmington, Delaware 19899

UNCONDITIONAL GUARANTY AGREEMENT - Page 12
(TIDEL SERVICES, INC.)

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