Document:

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                                                                     EXHIBIT 4.8

                                 PROMISSORY NOTE

$50,000.00                                                   Date: July 10, 1999

FOR VALUE RECEIVED, CHICAGO MAP CORPORATION, an Illinois corporation
("Borrower"), promises to pay to JOHN B. MCLEAN, an individual ("Lender"), or
order, the principal amount of FIFTY THOUSAND DOLLARS ($50,000,00) with interest
on the unpaid principal balance at one percent (1%) per month (the "Loan").

This Promissory Note is the Note referred to as Exhibit A to the Interim Loan
Agreement of even date herewith entered into by Borrower and Lender. Pursuant to
the terms of the Interim Loan Agreement, Lender has made the Loan to Borrower as
follows:

1.   Payment and Term. The Loan shall bear interest on the principal balance at
     1% per month from and after the date thereof until payment in full. The
     principal and interest, is due and payable as follows:

(a)  The Note is due in full four (4) months from the date hereof, unless
     extended by Lender pursuant to written notice thereof, or such other
     agreement as may be entered into between Lender and Borrower with respect
     thereto; and

(b)  Borrower may, but is not obligated to, make periodic payments in part or
     full payment of the Loan until due.

2.   Application of Payments. Unless applicable law provides otherwise, all
     payments received by Lender shall be applied by Lender first in payment of
     interest payable and next to the principal.

3.1  Events of Default. Upon the occurrence and during the continuance of any
     one or more events hereinafter enumerated, Lender may forthwith or at any
     time thereafter during the continuance of any such event, by notice in
     writing to Borrower, declare the unpaid balance of the principal and
     interest shall become and shall be immediately due and payable without
     presentation, demand, protest, notice of protest, or other notice of
     dishonor, all of which are hereby expressly waived by Borrower, such events
     being as follows:

(a)  Default in the payment of the principal and interest of the Note or any
     portion thereof when the same shall become due and payable, whether at
     maturity as therein expressed, by acceleration, or otherwise, unless cured
     within 10 days after notice thereof by the holder of such Note to Borrower;

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(b)  The creditors under any priority secured indebtedness of Borrower shall
     declare the amounts due thereunder to be due and payable following default;

(c)  Default in the due observance or performance of any other covenant or
     obligation contained in the Interim Loan Agreement, this Note or the
     Acquisition Agreement unless observed or performed within 10 days after
     notice thereof to Borrower by lender; provided, if compliance is not
     possible within 10 days, default shall occur upon failure within 10 days to
     take steps that will produce compliance as soon as is reasonably
     practicable;

(d)  Any representation or warranty herein or in the Acquisition Agreement made
     by Borrower proves to have been untrue in any material respects as of the
     date as of which the facts therein set forth were stated or certified, and
     corrective measures, satisfactory to Lender with respect as of the date as
     of which the facts therein set forth were stated or certified, and
     corrective measures, satisfactory to Lender with respect thereto shall not
     have been taken within 10 days after notice thereof to Lender; provided, if
     compliance is not possible within 10 days, default shall occur upon failure
     within 10 days to take steps that will produce compliance as is reasonably
     practicable;

(e)  Borrower shall file a voluntary petition in bankruptcy or a voluntary
     position seeking reorganization, or shall file an answer admitting the
     jurisdiction of the court and any material allegations of an involuntary
     petition filed pursuant to any act of Congress relating to bankruptcy or to
     any act purporting to be amendatory thereof, or shall be adjudicated
     bankrupt, or shall make an assignment for the benefit of creditors, or
     shall apply for or consent to the appointment of ANY receiver or trustee
     for Borrower, or of all or any substantial portion of its property, or
     Borrower shall make an assignment to an agent authorized to liquidate any
     substantial part of its assets;

(f)  An order shall be entered pursuant to any act of Congress relating to
     bankruptcy or to any act purporting to be amendatory thereof approving an
     involuntary petition seeking reorganization of Borrower, or an order of any
     court shall be entered appointing any receiver or trustee of or for
     Borrower, or any receive or trustee of all or any substantial portion of
     the property of Borrower, or a writ or warrant of attachment or any similar
     process shall be issued by any court against all or any substantial portion
     of the property of Borrower, and such order approving a petition seeking
     reorganization or appointing a receiver or trustee is not vacated or
     stayed, or such writ, warrant of attachment, or similar process is not
     released or bonded within 60 days after its entry or levy; or

(g)  The rendering against the Borrower of final judgment for the payment of
     money in excess of $25,000 and failure of the Borrower to appeal therefrom
     (or from the order, decree, or process pursuant to which such judgment was
     granted, passed, entered, or affirmed) and obtain a stay of execution
     thereof within the period prescribed by law for appeal, or to have such
     judgment discharged and satisfied within 60 days after the expiration of
     such period or of the period of any such stay, whichever shall later occur.

3.2  Procedure on Default. Upon the occurrence of an event of default, and at
     any time thereafter, Lender may elect to declare the entire Note
     immediately due and payable.

(a)  In the event of default in the payment of said Note when due or declared
     due, Lender shall have all the rights and remedies of a secured party and
     shall be entitled to avail itself of all such other rights and remedies
     that may now or hereafter exist at law or in equity for the
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     security interest created hereby and resort to any remedy provided
     hereunder or provided by the Illinois Uniform Commercial Code, or by any
     other law of the state of Illinois, shall not prevent the concurrent or
     subsequent employment of any other appropriate remedy or remedies; and

(b)  The requirement of reasonable notice to Borrower of the time and place of
     any public sale of the security or of the time after which any private
     sale, or any other intended disposition thereof is to be made, shall be met
     if such notice is mailed, postage prepaid, to Borrower at the address of
     such party designated below, at least 30 days before the date of any public
     or private sale or other disposition is to be made.

3.3  Defaults Upon Prior Indebtedness. Upon the default by Borrower of any term,
     covenant, or condition required to be performed by if on any priority
     secured indebtedness or the receipt by Borrower from any such priority
     secured creditor of notice of any default under such indebtedness, whether
     or not repayment of the indebtedness is accelerated, Borrower shall
     promptly advise Lender in writing of the nature and amount of default and
     of the action, if any, threatened by such priority secured creditor.
     Notwithstanding the Borrower's obligation to cure any and all such
     defaults, Lender may, but shall not be obligated to do so, in the name,
     place, and stead of Borrower and, in the case of such curative efforts by
     Lender, succeed to all of the rights, remedies, and security of such
     priority creditor.

4.   Attorneys' Fees. If this Note is placed with an attorney for collection, or
     is suit be instituted for collection, or is any other remedy permitted by
     law is pursued by Lender, because of any default in the terms and
     conditions herein, then in such event, the undersigned agrees to pay
     reasonable attorneys' fees, costs, and other expenses incurred by Lender in
     so doing.

5.   Governing Law. This Master Note shall be governed by and construed and
     enforced in accordance with the laws of the state of Illinois.

6.   Security Interest. Borrower shall execute a Security Agreement and an
     Escrow Agreement wherein Borrower shall grant to Lender a security interest
     in the Collateral as defined in the Interim Loan agreement, sufficient to
     secure the obligation created hereunder, which agreements shall be made a
     part of the Interim Loan Agreement and this Note and incorporated herein by
     this reference.

                                         BORROWER:

                                         CHICAGO MAP CORPORATION
                                         an Illinois corporation

                                         By:   /s/   John B. McLean
                                            -------------------------------
                                         Its Duly Authorized Representative<PAGE>   1
                                                                     EXHIBIT 4.9

                         FORM OF STOCK OPTION AGREEMENT

      This Stock Option Agreement ("Agreement") is made as of the 21st day of
July, 1999 between LEXON Technologies, Inc., a Delaware corporation ("Company),
and _______________________, ("Optionee").

       In consideration of $1.00 in hand paid to Company, it is agreed:

      1. OPTION. Company hereby grants Optionee an option to purchase ________
shares of the $.001 par value common stock of Company ("Shares"), on the terms
hereinafter set forth.

      2. PURCHASE PRICE.  The purchase price payable for the Shares upon
exercise of such option shall be $2.80, representing 100% of the fair market
value per Share as of July 21, 1999.

      3. METHOD OF EXERCISING OPTION. The option may be exercised at any time
during the period beginning on July 21, 1999 and continuing to the tenth
anniversary of this Agreement ("Option Period"). The option may be exercised in
whole or in part by giving to the Company notice in writing to that effect
Within thirty (30) days after the receipt by it of notice of exercise of such
option, the Company shall cause certificates for the number of Shares with
respect to which such option is exercised to be issued in the name of Optionee
or his executors, administrators, or other legal representatives, heirs,
legatees, next of kin, or distributees, or to be properly endorsed or
accompanied by separate stock powers duly executed, and to be delivered to
Optionee or his executors, administrators, or other legal representatives,
heirs, legatees, next of kin, or distributees, or to be properly endorsed or
accompanied by separate stock powers duly executed, and to be delivered to
Optionee or his executors, administrators, or other legal representatives,
heirs, legatees, next of kin, or distributees. Payment of the purchase price for
the Shares with respect to which such option is exercised shall be made to the
Company upon the delivery of such Shares. The Company shall give the person or
persons entitled to the same at least five (5) days notice of the time and place
for delivery and for the payment of suet purchase price.

      4. CONDITIONS OF OPTION. The option is subject to the following additional
conditions:

         a.  The option herein granted to Optionee shall not be transferable by
             Optionee other than by will or the laws of descent and
             distribution, and shall be exercisable, during his lifetime, only
             by him.

         b.  In the event of Optionee's death, the option may be exercised by
             his executors, administrators, or other legal representatives,
             heirs, legatees, next of kin, or distributees during the Option
             Period.

         c.  The provisions of the option shall become null and void and
             inoperative immediately upon any attempted sale, assignment,
             transfer, or other disposition by Optionee of such option or any of
             his right, title, and interest therein; provided, however, that
             nothing herein shall be construed as prohibiting Optionee upon his
             death (at any time while he has the right to exercise such option)
             from providing for the disposition of such option or his right,
             title, and interest in it by will or as prohibiting the transfer of
             such option or his right, title, and interest in it by will or as
             prohibiting the transfer of such option by the laws of descent and
             distribution.
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         d.  Each Share issued to the Optionee upon any exercise of the option
             granted hereunder shall be subject to repurchase by the Company at
             a price equal to the price paid for each such Share, upon the
             termination of Optionee's service with the Company for any reason
             or upon the death of Optionee, if such termination of service or
             death occurs on or before December 31, 2001, provided that the
             Company's right to repurchase shall terminate as to the following
             number of such Shares on each of the following dates: as to 75,300
             Shares as of December 31, 1999; as to 131,773 Shares, as of
             December 31, 2000; and as to 169,423 Shares as of December 31,
             2001.

         e.  Notwithstanding anything in this Agreement to the contrary, the
             option herein granted to Optionee shall in the event be exercisable
             after ten (10) years.

         5. RESTRICTION ON THE TRANSFER OF SHARES. Optionee hereby agrees,
without the consent of the Company, he will not, directly or indirectly, sell,
assign, transfer, pledge or otherwise dispose of (collectively "Transfer more
than 25% of the Shares within any ninety (90) day period. Notwithstanding the
foregoing, Optionee may Transfer the Shares to (i) the spouse or children of
such Optionee, whether directly or in trust (including pursuant to the uniform
gift to minors provisions) for their sole benefit, provided that the transferee
agrees in writing to be bound by the terms of this Agreement, and provided
further that Optionee may not disclaim beneficial ownership of such Shares for
the purposes of any filing pursuant to any securities law, or (ii) a trust in
which Optionee owns all of the beneficial interest therein, provided further
that Optionee may not disclaim beneficial ownership of such Shares for the
purposes of any filing pursuant to any securities law and (iii) a third party
making a cash tender or exchange offer in compliance with Regulations 14D and
14E under the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
following the filing with the Securities and Exchange Commission ('SEC') by the
Company, in compliance with the Exchange Act, a Recommendation Statement on
Schedule 14D-9 pursuant to which the Company affirmatively recommends to the
Company stockholders the acceptance of such cash tender or exchange offer.

         6. STOCK ADJUSTMENT. If the Company shall issue any additional shares
of stock by way of a stock dividend on, or split-up, subdivision, or
reclassification of outstanding common shares, then the option shall be deemed
to cover such additional shares to the extent that the same would have been
issued to Optionee had such option been exercised in its entirety at the time of
such issuance of additional shares, and there shall be a corresponding
proportionate adjustment of the option price per share set forth above so that
in the aggregate the option price for all Shares then covered shall be the same
as the aggregate option price for the Shares remaining subject to such option
immediately prior to the issuance of such additional shares.

         7. CORPORATE REORGANIZATION. If there shall be any capital
reorganization, or consolidation, or merger of the Company with any other
corporation or corporations, or any sale of all or substantially all of the
Company's property and assets to any other corporation or corporations, the
Company shall take appropriate action to enable Optionee to receive upon any
subsequent exercise of such option, in whole or in part, in lieu of any Shares
of the Company the share or shares, securities, or other assets as were issuable
or payable upon such reorganization, consolidation, merger, or sale in respect
of or in exchange for such Shares.

         8. OPTIONEE'S REPRESENTATIONS. Optionee represents and/or acknowledges
the following:

         a. That the Shares are being purchased for investment and not for
            distribution or resale to others. Optionee agrees that he will not
            sell or otherwise transfer the Shares unless they are registered
            under the Securities Act of 1933 or unless an exemption from such
            registration is available.

         b. The Shares have not been registered under the Securities Act of 1933
            or the Illinois Securities Act of 1953 as amended, or any other
            applicable state securities laws; the economic risk of the

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            investment must be borne indefinitely by Optionee, and the Shares
            cannot be sold unless subsequently registered under the Securities
            Act of 1933 and such state laws or an exemption from such
            registration is available. The Company has agreed to register the
            shares of Common Stock issuable on exercise of this Option at such
            time as the Company is eligible to utilize the form of registration
            on S-3 or S-8 under the Securities Act.

         c. Optionee is and will be a resident of the State set forth below his
            signature as of the date of his execution of this Agreement, and
            that the personal information provided on the Signature page is true
            and accurate as of the date hereof.

         d. Optionee confirms that he is aware of the present operational and
            financial condition of the Company, and has previously been advised
            that all documents, records and books pertaining to Company finances
            and operations were at all times available for inspection at the
            offices of Company, and that all documents, records and books
            pertaining to Company and Shares requested by Optionee have been
            made available to him.

         e. Optionee has had an opportunity to ask questions of, and receive
            answers from Company, its officers, directors, employees and agents
            concerning the terms and conditions of this Agreement, the
            transactions contemplated thereby, the operations of Company and
            related matters.

         f. Optionee, understands that no assurance is given that the actual
            result of operations will correspond with the past results as set
            forth in any tax or financial statements or other documents provided
            to Optionee and no reliance should be placed upon results of such
            past operations in determining whether an investment in Shares is
            advisable.

         9. COMPANY'S REPRESENTATIONS. The Company represents the following:

            a. It has the Tight to issue the Shares to Optionee.

            b. Optionee shall receive good and marketable title to the Shares,
               free of all encumbrances.

         10. BINDING EFFECT. This Agreement shall be binding upon the parties,
their heirs, legal representatives, successors, and assigns.

         11. ENTIRE AGREEMENT. This Agreement supersedes all agreements
previously made between the parties relating to its subject matter. There are no
other understandings or agreements between them.

         12. NON-WAIVER. No delay or failure by either party to exercise any
right under this Agreement, and no partial or single exercise of that right,
shall constitute a waiver of that or any other right, unless otherwise expressly
provided herein.

         13. GOVERNING LAW. This Agreement shall be governed by the laws of the
State of Illinois as to all matters including, but not limited to, matters of
validity, construction, effect, performance and remedies, and as partial
consideration for the other party's execution and performance hereunder, each
party hereby consents to the jurisdiction of any state or federal court located
within Cook County, Illinois and waives personal service of any and all process
upon it, to the extent permitted by law, and consents that all such service of
process be made upon such party at the address and in the manner set forth in
this Agreement, and service so made shall be deemed to be completed upon the
earlier of actual receipt or three (3) days after the same shall have been
posted to such party's address. Each party hereby waives trial by jury, and
waives any objection which it may have based on improper venue or forum non
conveniens, to the conduct of any proceeding instituted hereunder, and consents
to the granting of such legal or equitable relief as is deemed appropriate by
the court.

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       IN WITNESS WHEREOF, the parties have signed this Agreement.

                                                   LEXON Technologies, Inc.

                                                   By:
                                                      --------------------------
                                                      John B. McLean,
                                                      Assistant Secretary

                                                   ----------------------------
                                                            Optionee

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           SCHEDULE TO EXHIBIT 4.9 - FORM OF STOCK OPTION AGREEMENT

         On July 21, 1999, the Company entered into Stock Option Agreements with
certain employees of the Company. The Stock Option Agreements, which are
substantially similar, provide for immediate exercisability of the options
subject to certain forfeiture restrictions relating to the shares, which
forfeiture restrictions expire on the terms set forth below.

                         Number of  Shares
                         Issuable Upon Exercise   Shares Subject to Forfeiture/
Optionee                 of the Option            Date Forfeiture Expires
--------                 ----------------------   -----------------------------

Steven J. Peskaitis          376,496                75,300/ December 31, 1999
                                                   131,773/ December 31, 2000
                                                   169,423/ December 31, 2001

Kenneth Eaken                627,500               125,500/ December 31, 1999
                                                   219,625/ December 31, 2000
                                                   282,375/ December 31, 2001

Paris Karahalios             627,500               125,500/ December 31, 1999
                                                   219,625/ December 31, 2000
                                                   282,375/ December 31, 2001

John McLean                  627,500               125,500/ December 31, 1999
                                                   219,625/ December 31, 2000
                                                   282,375/ December 31, 2001

Stanley Peskaitis            275,000               100,000/ December 31, 1999
                                                   100,000/ December 31, 2000
                                                    75,000/ December 31, 2001

Dave Schulz                  285,000                95,000/ December 31, 1999
                                                    95,000/ December 31, 2000
                                                    95,000/ December 31, 2001

Dave Leonard                  12,500                12,500/ December 31, 1999

Jim Rooney                    12,550                12,550/ December 31, 1999

Thomas Riek                   12,550                12,550/ December 31, 1999

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