Document:

<PAGE>

                                EXHIBIT 10.23(a)
                            FIRST AMENDMENT TO LEASE

This First Amendment to Lease ("First Amendment") is made and shall be effective
for all purposes as of the 10th day of July, 1999 by and between 2200 West Park
Realty Trust ("Landlord") and Osicom Technologies, Inc. ("Tenant").

                                   WITNESSETH

WHEREAS, Tenant and Landlord entered into an Office Building Lease ("Original
Lease") dated July 1, 1999 for 3,728 square feet of Rentable Square Feet (RSF)
of Premises located on the third floor of 2200 West Park Drive, Westborough,
Massachusetts, and

WHEREAS, Landlord and Tenant desire to amend the Lease to extend the Rent
Commencement Date as more fully described hereafter.

NOW, THEREFORE, in consideration of the mutual promise herein contained and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree that the Lease shall be amended as
follows:

1.    Landlord and Tenant hereby incorporate all terms and provisions of the
      Lease herein contained as is specifically set forth, except as said terms
      are modified herein. Capitalized terms not specifically defined in this
      amendment shall have the same meaning given to the terms in the Lease.

2.    Article 1, Section 1.01

a)    Delete:
      "RENT COMMENCEMENT DATE: 9/01/1991,

      Insert:
      "RENT COMMENCEMENT DATE: 9/10/1991,

b)    Delete:
      "BASIC RENT: SEE SCHEDULE BELOW:

-------------------------------------------------------------------------------
        PERIOD      RATE PER SQ.FT     ANNUAL RENT     MONTHLY RENT
-------------------------------------------------------------------------------
Year 1            23.50             87,600          7,300.67
-------------------------------------------------------------------------------
Year 2            23.50             87,600          7,300.67
-------------------------------------------------------------------------------
Year 3            23.50             87,600          7,300.67
-------------------------------------------------------------------------------
Year 4            24-50             91,33           7,611.33
-------------------------------------------------------------------------------
Year 5            24.50             91,336          7,611.33
-------------------------------------------------------------------------------

Insert:
<PAGE>

"BASIC RENT: SEE SCHEDULE BELOW:"

-------------------------------------------------------------------------------
        PERIOD       RATE PER SQ.FT.    ANNUAL RENT       MONTHLY RENT
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
9/10/99-9/30/99    23.50              N/A               5,110.47
--------------------------------------------------------------------------------
2nd - 12th month   23.50              80,307.33         7,300.67
--------------------------------------------------------------------------------
Year 2             23.50              87,608            7,300.67
--------------------------------------------------------------------------------
Year 3             23.50              87,608            7,300.67
--------------------------------------------------------------------------------
Year 4             24.50              91,336            7,611.33
--------------------------------------------------------------------------------
Year 5             24.50              91,336            7,611.33
--------------------------------------------------------------------------------

In all other respects, the Original Lease of July 1, 1999 is hereby ratified,
confirmed, and approved.

IN WITNESS WHEREOF, the parties hereto have executed the Second Amendment to
Lease of the date set forth above.

LANDLORD                         TENANT:
2200 West Park Realty Trust      Osicom Technologies, Inc.

/s/ Leslie S. Carey              /s/ Gilbert G. Goldbeck

Leslie S. Carey, Trustee         Gilbert G. Goldbeck, Vice President - Finance
Date: July 10, 1999                      Date: July 10, 1999<PAGE>

                                  EXHIBIT 10.24
                               SUPPLY AGREEMENT(s)

         This Agreement is dated as of May 1, 1998, by and between NETsilicon,
Inc., having an address at 411 Waverley Oaks Road, Waltham, MA ("NSI"), and
Osicom Technologies, Inc., having an address at 2800 28th Street, Santa Monica,
CA ("Osicom").

         1. Term: The term of this Agreement shall be five (5) years from the
date set forth above, and may be terminated only upon the mutual consent of both
parties hereto.

         2. Agreement to Supply: For as long as this Agreement or any renewal or
extension thereof is in effect, Osicom shall purchase from NSI, and NSI shall
sell to Osicom, the products identified on Schedule A attached hereto and as
revised by mutual agreement from time to time ("NSI Products"), for resale to
present and future customers of Osicom. For as long as this Agreement or any
renewal or extension thereof is in effect, Osicom (or any subsidiary of Osicom)
shall manufacture NSI Products on behalf of NSI as long as they as price
competitive.

         3. Prices:

                    A. Osicom shall pay to NSI for all NSI Products delivered
hereunder an amount equal to the price as identified on Schedule A attached
hereto. The price for the NSI Product shall increase or decrease in proportion
to any increase or decrease, as the case may be, in NSI's Landed Costs, as
hereinafter defined, such that NSI shall maintain the same gross margin
percentage for each unit, provided, however, that NSI shall not offer to sell or
sell any NSI Product at a lower price or upon more favorable terms than the
price and terms offered to Osicom. "Landed Costs" shall be equal to costs to NSI
from their supplier.

                    B. NSI shall pay Osicom for all NSI Products manufactured by
Osicom for NSI at Osicom's best price, which will be determined by the parties
from time to time.

         4. Invoicing and Payment: Each party shall invoice the other for their
respective products, indicating in each case a shipping date and billing date.
Payment shall be due on a net cash basis thirty (30) days from the billing date.

         5. Delivery of Products: Each party will provide products in accordance
with their usual and customary methods. Orders will be received in accordance
with each party's usual and customary procedures for accepting orders, which
procedures have been communicated to by NSI to Osicom and by Osicom to NSI and
may change from time to time in either party's reasonable discretion. In the
event that either party orders any products in quantities substantially greater
or less than the quantities normally ordered, such order must be placed in time
as will reasonably permit the supplying party to fulfill that order (if greater)
or to dispose of any excess quantity of product (if lesser) which the supplying
party may have obtained.

         6. Force Majeure: Each party shall not be liable for any failure to
deliver products if such failure has been occasioned by the occurrence of any
act of war, fire, accident, casualty, embargo, strike, civil commotion,
government prohibitions or pre-emptions, failure of any supplier to supply
necessary products or ingredients, labor difficulties, equipment malfunction,
shortages of ingredients, fuel or energy, or any other circumstance beyond such
party's control.

<PAGE>

         7. Miscellaneous:

         7.1 Notices given under this Agreement shall be in writing, and shall
be deemed given when delivered by a recognized overnight service, or three (3)
days after deposit by certified mail, return receipt requested, addressed to a
party at the address given above, or to another address specified by a party.

         7.2 Each party (the "Indemnifying Party") agrees to protect, indemnify,
and hold the other, its successors and assigns, harmless from and against any
and all losses, liabilities, claims damages and expenses, including attorney's
fees, which Indemnifying Party may hereinafter incur, suffer or be required to
pay, and which arise out of Indemnifying Party's negligence or willful
misconduct.

         7.3 This Agreement shall be governed by Massachusetts law. The parties
consent to exclusive jurisdiction of courts sitting in Massachusetts for all
disputes arising under this Agreement. Service of process is effective if served
in the manner a notice may be given under this Agreement.

         7.4 Neither NSI nor Osicom shall not assign this Agreement to any other
person or entity, without the prior written consent of the other party, which
consent shall not be unreasonably withheld, provided, however, that Osicom may
assign all or any part of this Agreement to any of its subsidiaries without the
prior consent of NSI.

         7.5 This Agreement contains the entire understanding of the parties and
may be changed or waived only in writing. Waiver of a breach of this Agreement
shall not operate as a waiver of any other breach. This Agreement is binding
upon and inures to the benefit of the parties hereto and their successors and
assigns. Invalidity of any provision of this Agreement shall not affect other
provisions.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
day and year first set forth above.

Attest:                                NET SILICON, INC.

                                       By: /s/ Cornelius Peterson
                                           -----------------------------
                                           Cornelius Peterson, President

                                       OSICOM TECHNOLOGIES, INC.

                                       By: /s/ Christopher E. Sue
                                           -----------------------------
                                           Christopher E. Sue,
                                           Vice-President of Finance
<PAGE>

                                   Schedule A
                                    Products

         PRODUCTS                                                 PRICE
         --------------------------------------------------------------

Osicom Purchases from NETsilicon

         NET+ARM chips                                          $19.00

         Novell runtime licenses                                 $3.50

                                      -3-
<PAGE>

                             INTERCOMPANY AGREEMENT

         THIS AGREEMENT (the "Agreement") is made and entered into as of the 1st
day of May, 1998, by and between NETsilicon, Inc., having an address at 411
Waverley Oaks Road, Waltham, MA ("NSI") and Osicom Technologies, Inc., having an
address at 2800 28th Street, Santa Monica, CA ("Osicom").

                              W I T N E S S E T H:

         WHEREAS, NSI is currently a wholly owned subsidiary of Osicom;

         WHEREAS, NSI and Osicom are in the process of registering NSI's common
shares with the U.S. Securities and Exchange Commission for the purposes of
selling rights to purchase NSI's common shares to the public (the "Rights
Offering");

         WHEREAS, after the Offering, Osicom will continue to be a substantial
stockholder of NSI;

         WHEREAS, the parties deem it advisable at this time to provide for the
terms and conditions of the business relationship between the parties after the
Rights Offering;

         NOW, THEREFORE, in consideration of the premises and mutual
undertakings herein, and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged by each of the parties hereto,
the undersigned parties hereby agree as follows:

1.       NSI hereby assigns, and Osicom hereby accepts the assignment of, the
         right to manufacture and market those products, commonly referred to by
         the parties as commercial products, listed on Schedule A attached
         hereto (the "Assigned Products").

2.       NSI hereby assigns all of its right, title and interest in the
         following assets to Osicom:

         a.    The names, addresses, phone numbers, principal contacts and sales
               history for the period through the close of the month immediately
               preceding the Closing Date with respect to all of NSI's
               commercial customers and all of NSI's sales leads and prospect
               lists together with copies of all relevant documents such as
               customer contracts, sales records, agreements, and the like;

         b.    All accounts receivable with respect to the Assigned Products
               accruing after July 31, 1998;

         c.    NSI's inventory of Assigned Products. Osicom shall have the
               option to purchase from NSI all of NSI inventory of Assigned
               Products existing on July 31, 1998 at a price equal to NSI's cost
               of manufacturing, developing and shipping such Assigned Products.
               NSI shall ship such Assigned Products inventory to Osicom at such
               a location as Osicom shall designate in such quantities and at
               such time as shall be requested by Osicom. Osicom will pay NSI on
               terms available to its most favored customers within thirty (30)
               days after the end of each calendar month for those Assigned
               Products which have been shipped to Osicom by NSI during such
               previous calendar month. No later than nine (9) months after the
               effective date of this Agreement, both parties will reconcile any
               remaining monies owed to NSI by Osicom, and Osicom will pay NSI
               any balance due.

         d.    Furniture, fixtures, equipment and computer software as set forth
               on the attached Schedule B.

3.       Osicom hereby assigns, and NSI hereby assumes, all of Osicom's right,
         title and interest in and to the trademark "NET+ARM", including, but
         not limited to those rights arising from a Trademark License Agreement
<PAGE>

         dated July 14, 1998 by and between Osicom and ARM Limited. Osicom shall
         use its best efforts to obtain ARM Limited's consent to assignment of
         the Trademark Licensing Agreement prior to the commencement of the
         Rights Offering.

4.       The parties acknowledge that Osicom is owed by NSI the approximate sum
         of $4,100,000 arising from the parties prior parent/subsidiary
         relationship. NSI agrees to pay all indebtedness in full to Osicom upon
         completion of the Rights Offering .

5.       During the term of this Agreement, NSI shall provide to Osicom
         manufacturing and engineering support with respect to the Assigned
         Products on an "as needed" basis. Osicom will pay NSI for such support
         at a rate of one hundred and ten percent (110%) of the actual labor
         costs to NSI. The costs of any materials provided to Osicom by NSI with
         respect to manufacturing support provided by NSI shall be reimbursed by
         Osicom at a rate of one-hundred and ten (110%) of the actual cost of
         material incurred by NSI. NSI will invoice Osicom quarterly for NSI
         support and materials. Payment shall be due from Osicom to NSI on a net
         cash basis thirty (30) days from the billing date.

6.       The parties acknowledge that in connection with the assignment of the
         Assigned Products, certain mutually agreeable employees will cease
         performing services for NSI and shall thereafter perform services for
         Osicom (the "Transferred Employees"). Transferred Employees shall be
         transferred to Osicom's payroll as of July 31, 1998. However,
         Transferred Employees shall remain on NSI's health insurance plan. NSI
         will forward an invoice each month to Osicom which shall indicate the
         amount of premium payment made by NSI with respect to such Transferred
         Employees as well as documentation of their continued coverage under
         NSI's health plan. Payment shall be due from Osicom to NSI on a net
         cash basis thirty (30) days from the billing date. Notwithstanding
         anything to the contrary in this Agreement, the terms of this Section 5
         shall survive the termination of this Agreement.

7.       Osicom shall provide to NSI certain MIS computer services at NSI place
         of business at Waltham, Massachusetts, including, without limitation,
         the maintenance of data lines. In consideration for such services, NSI
         shall pay to Osicom the sum of one thousand dollars ($1,000) per month,
         payable on the first day of each calendar month as long as NSI requires
         such services.

8.       Osicom and NSI agree that Osicom shall have co-ownership of the
         intellectual property listed on Schedule C attached hereto (the
         "Intellectual Property"), completed as of the commencement of the
         Rights Offering, for Osicom's product development needs, provided,
         however, that the Intellectual Property shall become a part of a
         value-added Osicom product provided, further that Osicom shall not
         resell, license, transfer or assign to any third party all or any part
         of the Intellectual Property or any derivative thereof.

9.       The term of this Agreement shall be for a period of twelve (12) months
         from the date set forth above. This Agreement may be sooner terminated
         only upon the written agreement of both parties hereto.
<PAGE>

10.      The invalidity or unenforceability of any provision of this Agreement
         shall not affect the validity or enforceability of any other provisions
         of this Agreement, which shall remain in full force and effect.

11.      Notices given under this Agreement shall be in writing, and shall be
         deemed given when delivered by a recognized overnight service, or three
         (3) days after deposit by certified mail, return receipt requested,
         addressed to a party at the address given above, or to another address
         specified by a party.

12.      This Agreement shall be governed by Massachusetts law. The parties
         consent to exclusive jurisdiction of courts sitting in Massachusetts
         for all disputes arising under this Agreement. Service of process is
         effective if served in the manner a notice may be given under this
         Agreement.

13.      Neither NSI nor Osicom shall assign this Agreement to any other person
         or entity, without the prior written consent of the other party,
         provided, however, that Osicom may assign all or part of this Agreement
         to any of its subsidiaries without the prior consent of NSI.

14.      This Agreement contains the entire understanding of the parties and may
         be changed or waived only in writing. Waiver of a breach of this
         Agreement shall not operate as a waiver of any other breach. This
         Agreement is binding upon and inures to the benefit of the parties
         hereto and their successors and assigns. Invalidity of any provision of
         this Agreement shall not affect other provisions.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
day and year first set forth above

Attest:                                     NET SILICON, INC.

                                            By: /s/ Cornelius Peterson
--------------------------                     ---------------------------------
                                                Cornelius Peterson, President

                                            OSICOM TECHNOLOGIES, INC.

                                            By: /s/ Christopher E. Sue
--------------------------                     -----------------------------
                                                Christopher E. Sue,
                                                Vice-President of Finance
<PAGE>

                                   Schedule A
                     Commercial Products assigned to Osicom

ALL MODELS OF THE FOLLOWING

NETPrint
JETXPrint
Netcommuter
<PAGE>

                                   Schedule B
      Furniture, fixtures and equipment assigned to Osicom-leased or owned.

All such equipment whether owned by NSI or leased located in Suite 241 now
occupied by Osicom commercial sales at 411 Waverley Oaks Park.

All software currently in use in Suite 241 as NSI has title therein.
<PAGE>

                                   Schedule C
               NSI Intellectual Property available for Osicom use

All designs of products of NSI as of the date of commencement of the Rights
Offering.

         The deliverables for hardware products of NSI are verilog design
         models, CAD drawings for artwork, schematics for logic design, and
         bills of materials.

         The deliverables for software products are source code relating to
         software and firmware.

         All other hardware, software, firmware, documentation, bills of
         material, test plans necessary for Osicom to either design, modify or
         manufacture the components produced or to be produced by NSI.
<PAGE>

                            OSICOM TECHNOLOGIES, INC.
                                2800 28TH Street
                                    Suite 100
                         Santa Monica, California 90405

                                                                  March 10, 1999

Mr. Cornelius Peterson VIII
President and CEO
NETsilicon, Inc.
411 Waverly Oaks Road
Suite 227
Waltham, Mass. 02154

Dear Pete:

     This letter confirms our agreement to amend the Intercompany Agreement (the
"Agreement") dated as of May 1, 1998 between NETsilicon, Inc. ("NSI") and Osicom
Technologies, Inc. ("Osicom") as set forth below. Osicom and NETsilicon hereby
agree that these amendments shall be effective as of May 1, 1998.

     1.   The term of paragraph 5 of the Agreement, as to engineering support
          only, shall expire on June 30, 1999, subject, however, to the right of
          Osicom to terminate such extension at any time on five (5) business
          days prior written notice to NSI. The term of paragraph 5 of the
          Agreement, as to manufacturing services, shall expire on April 30,
          1999.

     2.   Paragraph 8 of the Agreement is hereby deleted and replaced in its
          entirety by the following: NSI and Osicom shall jointly own the
          intellectual property set forth on the attached Schedule C (the
          "Intellectual Property") subject to the following limitations: (a)
          Osicom's rights to the Intellectual Property shall be limited to its
          use solely for the purpose of developing, manufacturing and selling
          the commercial products listed on Schedule A to the Agreement; (b)
          Osicom shall not use the Intellectual Property in any products that
          directly compete with any NETsilicon products; and (c) Osicom shall
          have no right to sell, license, transfer or assign to any third party
          all or any part of its rights in the Intellectual Property or any
          derivative thereof. Furthermore, Osicom acknowledges that, except as
          provided herein, NETsilicon's rights to the Intellectual Property are
          owned by NETsilicon without limitation.

     3.   Schedule C of the Agreement is hereby deleted and replaced it its
          entirety by Schedule C attached to this letter and made a part hereof.
<PAGE>

     4.   Except as amended by this letter, the Agreement remains in full force
          and effect according to its terms.

     If the foregoing correctly sets our agreement, please sign and return this
letter to me.

                                        Very truly yours,

                                        OSICOM TECHNOLOGIES, INC.

                                        By: /s/ Par Chadha
                                            ------------------------------------
                                            Par Chadha, Chief Executive Officer

Agreed to and accepted
this 10th day of March, 1999

NETsilicon, Inc.

/s/ Cornelius Peterson VIII
---------------------------
Cornelius Peterson, VIII
President and CEO

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