EXHIBIT 10.27
 
                                                        Master Lease Number_____
                                 ADDENDUM NO. 4
                                    PHASE 1
                                OPERATING LEASE

This Addendum No. 4 to that certain Agreement for Phase 1 Information Technology
Services ("Phase 1 ITS Agreement") is a Phase 1 Operating Lease ("Phase l
Operating Lease") between Electronic Data Systems Corporation, a Texas
corporation ("EDS"), and Spectradyne, Inc., a Delaware corporation
("Spectradyne"), dated as of July 28, 1993 (and including subsequent addendums),
is made and entered into by and between EDS and Spectradyne as of January l,
1995.

                                    RECITALS

WHEREAS, EDS and Spectradyne intend to confirm, by this Phase l Operating Lease,
the status of EDS's ownership of, and Spectradyne's rights and obligations with
respect to, the equipment listed on Schedule 1.l, which equipment is being
leased pursuant to this Phase 1 Operating Lease, subject to the right (as set
out herein) of Spectradyne to purchase all of such equipment at the greater of
the residual value or the fair market value at the end of the Base Term or any
Renewal Term (as defined herein); and

NOW, THEREFORE, in consideration of these premises and agreements set forth
herein, and for other good and valuable consideration, the sufficiency and
receipt of which are hereby acknowledged, EDS and Spectradyne hereby agree to
undertake all rights and obligations under the terms and conditions of this
Phase 1 Operating Lease.

                                   ARTICLE I
                                     LEASE

1.1  Lease.  Subject to the terms and conditions herein, EDS hereby agrees to
     lease to Spectradyne, and Spectradyne agrees to lease from EDS, the
     equipment listed in Schedule 1.1 that is part of the compressed digital
     video network installed, operated and managed by EDS for Spectradyne
     (collectively, the "Equipment").

                                                          Lessee's initials_____

                                       1

 
                                                        Master Lease Number_____

                                 ARTICLE II
                                      TERM

2.1  Original Term.  The Term of this Phase 1 Operating Lease shall commence on
     January l, 1995 and, subject to the terms hereof, this Phase 1 Operating
     Lease shall continue for a base term through December 31, 1997 ("Base
     Term").

2.2  Renewal Term.  Unless and until EDS receives Spectradyne's Notice to
     Terminate (as defined herein), the term shall renew for successive one-year
     renewal terms (each, a "Renewal Term"), each such respective Renewal Term
     to continue until and through the last day of such additional one year
     period.

2.3  Termination.  Upon giving written notice to EDS at least 90 days prior to
     the expiration of the Base Term or any Renewal Term ("Spectradyne's Notice
     to Terminate"), as the case may be, Spectradyne may terminate this Phase l
     Operating Lease as of the expiration of such Base Term or such Renewal
     Term, as the case may be.

                                  ARTICLE III
                                      RENT

3.1  Rent.  Spectradyne agrees to pay EDS in cash (by check or wire transfer)
     the rental payments (individually, a "Rent Payment" and collectively, "Rent
     Payments")  with respect to the Equipment in the amounts set out on
     Schedule 3.1.  Except for the Rent Payments for January, February and March
     of 1995, Rent Payments shall be paid in full in arrears on or before the
     last day of each calendar month in the amounts set out in such Schedule
     3.1, and such Rent Payments shall become "past due" if not paid on or
     before the last day of the respective month (or on the next business day if
     such last day is not a business day) and shall be paid by Spectradyne on
     such last day (or next business day if such day is not a business day).
     The Rent Payments for January, February and March of 1995 are (i) subject
     to the Minimum Payments provided for in that certain Special Provisions
     Agreement ("Special Provisions Agreement") among EDS, EDS Technical
     Products Corporation,  Spectradyne and SpectraVision, Inc. (formerly, SPI
     Holding, Inc.)  ("SpectraVision"), dated as of January l, 1995; (ii) shall
     accrue interest at the annual  rate  of  11 1/2% commencing on the first
     day of the month immediately following the calendar month covered by such
     Rental Payment and ending on the earlier of August 31, 1995 and the date
     paid; (iii) shall be paid by

                                                          Lessee's initials_____

                                       2

 
                                                        Master Lease Number_____

     Spectradyne, with interest if applicable, in accordance with the
     aforementioned Minimum Payments but in no event later than August 31, 1995;
     and (iv) shall become "past due" if not paid on or before August 31, 1995.

3.2  Past Due Rent.  Spectradyne agrees to pay EDS interest at the annual rate
     of 11-1/2% on each Rent Payment starting from the date such Rent Payment
     becomes past due and continuing through the date of the full payment of
     said Rent Payment.  Acceptance of overdue Rent Payments or interest thereon
     shall in no event constitute a waiver of Spectradyne's default or prevent
     EDS from exercising any other of its rights herein or otherwise.

3.3  Non-Cancelable Rent and Lease Obligations.  This is a net lease.
     SPECTRADYNE'S OBLIGATION TO PAY ALL AMOUNTS DUE UNDER THIS LEASE SHALL BE
     ABSOLUTE, UNCONDITIONAL, AND  SHALL NOT BE SUBJECT TO ANY SET-OFF, COUNTER
     CLAIM, ABATEMENT, REDUCTION, RECOUPMENT, INTERRUPTION, DEFENSE FOR ANY
     REASON WHATSOEVER AGAINST EDS OR ITS ASSIGNEE, INCLUDING WITHOUT LIMITATION
     DEFECTS OR FAILURE IN, LOSS OF USE OR POSSESSION OF, OR DISCONTINUANCE OF
     THE EQUIPMENT.  THIS LEASE CANNOT BE PREPAID OR TERMINATED BY SPECTRADYNE
     UNLESS AGREED TO IN WRITING BY EDS.

3.4  Location of Payment.  The payments pursuant to this Article III shall be
     made to EDS at such location as directed by EDS from time to time by
     invoice or other writing from EDS.

                                   ARTICLE IV
                              EQUIPMENT OWNERSHIP
                        USE, MAINTENANCE, AND PROTECTION

4.1  Ownership and Use.  Subject to Section 9.5 hereof, the Equipment shall at
     all times during this Phase l Operating Lease be owned by EDS.  Spectradyne
     will not assert any right of ownership in and to the Equipment.
     Spectradyne shall use, operate, maintain and store the Equipment in a
     careful and proper manner, and shall comply with all laws, ordinances,
     rules, regulations, requirements and recommendations relating directly or
     indirectly  to  the Equipment issued by any governmental unit, insurer, or
     the Equipment's manufacturer.  Spectradyne, upon EDS's request, will affix
     to, keep and maintain on, in a plain and conspicuous manner, any item of
     Equipment plates

                                                          Lessee's initials_____

                                       3

 
                                                        Master Lease Number_____

     or markings indicating EDS's ownership of the Equipment.  EDS may upon
     reasonable prior notice to Spectradyne and during regular business hours
     inspect the Equipment.

4.2  EDS's Entitlement To Tax Benefits.  Spectradyne acknowledges that EDS will
     claim all tax benefits of ownership.  Spectradyne will, if requested by
     EDS, furnish EDS with records and information necessary for tax purposes.
     Spectradyne will not take, refrain or omit to take, and will not permit any
     permitted sublessee or assignee to do the same, any action that may result
     in the disqualification of the Equipment for, or any recapture of, all or
     any portion of the tax benefits afforded the Equipment under the Internal
     Revenue Code of 1986, as amended.

4.3  Improvements.  Any accessory, feature, device, improvement, modification,
     addition, accession, or upgrades to the Equipment shall be the property of
     EDS and subject to the lease hereunder.

4.4  Maintenance.  Maintenance of the Equipment will be as provided in Section
     4.5 and 6.6 of the Phase 1 ITS Agreement.

4.5  Residual Value.  EDS and Spectradyne agree that the "residual value" of the
     Equipment may be difficult to ascertain.  EDS and Spectradyne have
     stipulated on Schedule 3.1 as to the "residual value" of the Equipment (the
     "Residual Value").

                                   ARTICLE V
                   RISK OF LOSS AND CLAIMS PAYMENT PROCEDURES

5.1  Risk of Loss.  Risk of loss with respect to the Equipment will be allocated
     as provided in Section 14.3 of the Phase 1 ITS Agreement.

5.2  Notice of Loss or Damage.  Spectradyne shall advise EDS in writing within
     10 days of any such loss or damage.

5.3  General Indemnity.  Spectradyne shall indemnify, hold harmless, and, if so
     requested by EDS, defend EDS and its predecessors, successors, assigns,
     officers, directors, agents and employees against all claims ("Claims")
     directly or indirectly arising out of or connected with the Equipment
     except to the extent such Claims result from negligent or willful damage or
     destruction by

                                                          Lessee's initials_____

                                       4

 
                                                        Master Lease Number_____

     EDS, its employees, agents or contractors.  Claims refers to all losses,
     liabilities, damages, penalties, expenses (including reasonable legal fees
     and costs), claims, actions and suits, whether in contract or in tort and
     whether based on a theory of strict liability or otherwise, and includes,
     without limitation to, matters regarding:  (a) the selection, manufacture,
     purchase, acceptance, rejection, ownership, delivery, lease, possession,
     maintenance, use, condition, return or operation of the Equipment; (b) any
     latent defects or other defects in any Equipment, whether or not
     discoverable by EDS or by Spectradyne; (c) any patent, trademark, or
     copyright infringement; and (d) the condition of any Equipment arising or
     existing during Spectradyne's use.

                                   ARTICLE VI
                         SPECTRADYNE'S REPRESENTATIONS,
                            WARRANTIES AND COVENANTS

6.1  Representations and Warranties.  Spectradyne represents, warrants and
     covenants to EDS that as of the time of entering into this Phase 1
     Operating Lease:  (i) Spectradyne's execution, delivery and performance of
     this Phase l Operating Lease have been duly authorized by all necessary
     action on the part of Spectradyne and this Phase 1 Operating Lease
     constitutes the legal, valid and binding obligation of Spectradyne and (ii)
     the execution and delivery by Spectradyne of this Phase l Operating Lease
     does not conflict with or result in a breach of any of the provisions of
     Spectradyne's organizational documents, applicable law, judgment, order,
     writ, injunction, decree, rule or regulation propounded by any organization
     having authority over Spectradyne, or of any agreement or other instrument
     to which Spectradyne is a party or by which it is bound, or constitutes a
     default under any thereof.

6.2  Providing Financial Information.  Spectradyne will promptly furnish EDS
     SpectraVision's public or private financial statements as they become
     generally available to others.

6.3  Assignment or Transfer.  EXCEPT AS OTHERWISE PROVIDED IN SECTION 15.8 OF
     THE PHASE I ITS AGREEMENT, SPECTRADYNE SHALL NOT, WITHOUT THE PRIOR WRITTEN
     CONSENT OF EDS, TRANSFER, SUBLEASE, ASSIGN, PLEDGE OR HYPOTHECATE THIS
     PHASE l OPERATING LEASE, THE EQUIPMENT OR ANY PART THEREOF OR ANY INTEREST
     THEREIN.  EXCEPT AS OTHERWISE PROVIDED IN SECTION 15.8 OF THE PHASE I ITS
     AGREEMENT, SPECTRADYNE

                                                          Lessee's initials_____

                                       5

 
                                                        Master Lease Number_____

     FURTHER COVENANTS THAT DURING THE TERM HEREOF SPECTRADYNE WILL GIVE EDS
     PRIOR WRITTEN NOTICE OF ITS CONSOLIDATION, MERGER OR OTHER TYPE
     COMBINATION, WITH ANY OTHER CORPORATION OR ENTITY, OR THE SALE, LEASE OR
     OTHER DISPOSAL OF ALL OR SUBSTANTIALLY ALL OF SPECTRADYNE'S PROPERTIES.
     EDS MAY TRANSFER, ASSIGN OR OTHERWISE CONVEY THIS PHASE l OPERATING LEASE,
     THE EQUIPMENT OR ANY PART THEREOF OR ANY INTEREST THEREIN TO AN AFFILIATE
     OF EDS.

6.4  No Creation Of Liens.  Spectradyne will not directly or indirectly create,
     incur, assume or suffer to exist any mortgage, pledge, charge, encumbrance,
     security, right, or claim of any kind ("Lien") on or with respect to any of
     the Equipment.  Spectradyne will promptly notify EDS in writing of the
     existence of any Lien and will promptly, at Spectradyne's expense, cause
     any such Lien to be duly discharged, dismissed and removed or fully bonded
     as soon as possible, but in any event within thirty (30) days after the
     existence of the same shall have first become known to Spectradyne or
     sooner, if necessary, to prevent the loss of possession of any Item of
     Equipment.

6.5  Payment Of Applicable Taxes.  If required by law or directed to do so by
     EDS, Spectradyne shall prepare and file all necessary forms for the
     assessments of taxes of any type and nature, and immediately send to EDS a
     copy of such filing.  Spectradyne will reimburse (or pay directly, but only
     if notified to do so by EDS), indemnify and hold EDS harmless from, all
     licenses, registration fees, sales, use, personal property, stamp or other
     taxes, levies, imports, duties, charges, assessments or withholdings of any
     nature whatsoever (other than those measured by EDS's net income) together
     with any penalties, fines or interest thereon imposed against EDS,
     Spectradyne or the Equipment (but only if EDS's acts or omissions did not
     cause the same).

6.6  Further Assurances and Payment of EDS's Expenses.  Spectradyne will
     promptly execute and deliver or cause to be executed and delivered, to EDS
     such further documents and take such further action as EDS may from time to
     time request in order to more effectively carry out the intent and purpose
     of this Phase l Operating Lease and to protect the rights of EDS confirmed
     and remedies of EDS created or intended to be created hereunder.
     Spectradyne shall pay all reasonable costs and expenses incurred by EDS; in
     collecting or attempting to collect any sums owed under this Phase l
     Operating Lease or in enforcing any of EDS's rights or remedies pursuant to
     this Phase l Operating

                                                          Lessee's initials_____

                                       6

 
                                                        Master Lease Number_____

     Lease.  Spectradyne also covenants to obtain no later than February 15,
     1995 ratification by its Board of Directors of the execution, delivery and
     performance of this Phase 1 Operating Lease.

                                  ARTICLE VII
                                   EDS RIGHTS

7.1  Assignment.  Except as otherwise provided herein, the rights of EDS and
     Spectradyne with respect to assignment are as provided in Section 15.8 of
     the Phase l ITS Agreement.

7.2  EDS's Performance of Spectradyne's Obligations.  EDS shall have the right,
     but not the obligation, without releasing Spectradyne from any obligation
     hereunder, should Spectradyne fail to make any payment hereunder or do any
     act as herein provided, to make or do the same and to pay, purchase,
     contest or compromise any Lien not permitted hereunder which in EDS's
     judgment appears to affect the Equipment or EDS's rights with respect
     thereto, and in exercising any such rights, incur any liability and expend
     whatever amounts in its discretion it may deem necessary therefor.  All
     sums so incurred or expended by EDS shall be immediately due and payable by
     Spectradyne and shall bear interest at the annual interest rate at 11-1/2%,
     from the date so incurred or expended by EDS to the date EDS is reimbursed
     therefor by Spectradyne.

7.3  File Appropriate Financing Statements.  EDS may at its option complete and
     file, with such authorities and at such locations as it may deem
     appropriate, Uniform Commercial Code financing statements signed by EDS
     only, relating to any of the Equipment.  If EDS and Spectradyne agree the
     Item(s) of Equipment are movable as defined by Chapter 9.103(c) of the
     Texas Business and Consumers Code, they shall note their agreement in
     writing and EDS may file appropriate financing statements in the political
     subdivision of Spectradyne's home office.  Spectradyne will promptly notify
     EDS in writing of a change of its home offices.  The expense associated
     with the filing of Uniform Commercial Code financing statements, whether
     signed by EDS or Spectradyne, shall be borne by Spectradyne.

                                                          Lessee's initials_____

                                       7

 
                                                        Master Lease Number_____

                                 ARTICLE VIII
                              DEFAULT AND REMEDIES

8.1  Events of Default.  An "Event of Default" shall occur hereunder if
     Spectradyne (a) fails to pay any installment of Rent or other payment
     required hereunder no later than 10 days after the day when due; or (b)
     fails to make any payment described in Section 1.1 of the Special
     Provisions Agreement no later than 10 days after the date when due; or (c)
     without EDS's consent, attempts to remove, sell, transfer, encumber, part
     with possession of, or sublet any item of Equipment; or (d) becomes
     insolvent or makes an assignment for the benefit of creditors, or a trustee
     or receiver shall be appointed for Spectradyne or for a substantial part of
     its property, or institutes or has instituted against it bankruptcy,
     reorganization or insolvency proceedings (and in the case of the
     appointment of a trustee or receiver upon an action instituted by a party
     other than Spectradyne or SpectraVision or in the case of proceedings
     instituted by a party other than Spectradyne or SpectraVision, such
     appointment or proceedings are not dissolved within sixty (60) days); or
     (e) makes or fails to make any statement, representation or warranty in
     this Phase l Operating Lease or any application, certificate, financial
     report or other document that if made or omitted is false or misleading in
     any material respect; or (f) creates or permits to be created any lien
     against any of the Equipment that is not discharged within thirty (30) days
     of its creation; or (g) merges, combines with, or in any way changes its
     present legal structure in such a manner which would in the opinion of EDS
     have a material adverse effect upon the Spectradyne's abilities to perform
     its obligation under this Phase 1 Operating Lease; or (h) fails to obtain
     by February 15, 1995 ratification by its Board of Directors of the
     execution, delivery and performance of this Phase 1 Operating Lease no
     later than February 15, 1995.

8.2  Remedies.  If an Event of Default occurs, EDS may, in its sole discretion,
     exercise one or more of the following remedies:  (a) terminate this Phase l
     Operating Lease; or (b) take possession of, or render unusable, any
     Equipment wherever the Equipment may be located, without demand or notice,
     without any court order or other process of law and without liability to
     Spectradyne for any damages occasioned by such action, and such action
     shall not constitute a termination; or (c) require Spectradyne to deliver
     the Equipment at a location designated by EDS; or (d) proceed by court
     action to enforce performance by Spectradyne and/or to recover all damages
     and expenses incurred by EDS by reason of any Event of Default; or (e)
     exercise any other

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                                       8

 
                                                        Master Lease Number_____

     right or remedy available to EDS at law or in equity; or (f) exercise its
     rights pursuant to Article II of the Special Provisions Agreement.  Also,
     Spectradyne shall pay EDS all costs and expenses (including reasonable
     legal fees and costs and fees of collection agencies) incurred by EDS in
     enforcing any of the terms, conditions or provisions of this Phase l
     Operating Lease. Upon repossession or surrender of any of the Equipment,
     EDS shall lease, sell or re-lease such Equipment in a commercially
     reasonable manner, with or without notice and at public or private sale,
     and apply the net proceeds (net proceeds shall mean the rents paid and
     payable during the remaining Base Term or the then current Renewal Term, as
     the case may be, thereof after deducting all expenses incurred in
     connection therewith) to, first, the Residual Value of the Equipment and,
     then, any other amount owed to EDS hereunder; provided, however, that
     Spectradyne shall remain liable to EDS for any deficiency that remains
     after any sale, lease or release of such Equipment. Spectradyne agrees that
     with respect to any notice of a sale required by law to be given, 10 days'
     notice shall constitute reasonable notice.  These remedies are cumulative
     of every other right or remedy given hereunder or now or hereafter existing
     at law or in equity or by statute or otherwise, and may be enforced
     concurrently therewith or from time to time.

                                   ARTICLE IX
                                GENERAL MATTERS

9.1  Captions:  Counterparts:  Integration:  Entire Phase l Operating Lease.
     The captions contained in this Phase I Operating Lease are for convenience
     only and shall not affect the interpretation of this Phase l Operating
     Lease.  This Phase l Operating Lease and all attachments hereto executed by
     both EDS and Spectradyne, constitute the entire Phase l Operating Lease
     between EDS and Spectradyne relating to the leasing of the Equipment, and
     supersede all prior leases relating thereto, whether written or oral, and
     may not be amended or modified except in a writing signed by the parties
     hereto.

9.2  Filing Fees; Notices.  Upon demand, Spectradyne will promptly reimburse EDS
     for any filing or recordation fees or expenses (including lien search fees,
     legal  fees and costs incurred by EDS in consummation of this Phase l
     Operating Lease or approval of a permitted  assignment or  transfer by
     Spectradyne.  All notices under  this Phase 1 Operating Lease shall be sent
     to the respective party at its address set forth under its signature to
     this Phase l Operating Lease or at such other address as the parties may
     provide to each other in

                                                          Lessee's initials_____

                                       9

 
                                                        Master Lease Number_____

     writing from time to time. Notice shall be deemed made (i) when mailed to
     said address shall be effective when deposited in the United States mail,
     duly addressed and with first class postage prepaid; (ii) when received by
     from a recognized courier service with proof of delivery thereof; (iii)
     when delivered personally; or (iv) when received at a facsimile receiving
     station which clearly identifies the recipient.

9.3  EDS's Disclaimer of Warranties.  EXCEPT AS OTHERWISE PROVIDED IN THE PHASE
     1 ITS AGREEMENT, EDS HAS NOT MADE AND DOES NOT MAKE, BY VIRTUE OF HAVING
     LEASED THE EQUIPMENT UNDER THIS LEASE OR BY VIRTUE OF ANY NEGOTIATIONS IN
     RESPECT OF THIS LEASE, ANY REPRESENTATIONS OR WARRANTY, EXPRESS OR IMPLIED,
     AS TO TITLE, CONDITION, COMPLIANCE WITH SPECIFICATIONS OR REGULATIONS,
     QUALITY, VALUE, DURABILITY, SUITABILITY, MERCHANTABILITY OR FITNESS FOR USE
     OR FITNESS FOR A PARTICULAR PURPOSE OR ANY OTHER WARRANTY WHATSOEVER,
     EXPRESS OR IMPLIED, WITH RESPECT TO THE EQUIPMENT.  EXCEPT AS OTHERWISE
     PROVIDED IN PHASE 1 ITS AGREEMENT, THE EQUIPMENT IS LEASED HEREUNDER BY EDS
     "AS-IS."  EXCEPT AS OTHERWISE PROVIDED IN THE PHASE 1 ITS AGREEMENT,
     SPECTRADYNE ACKNOWLEDGES THAT IT HAS SELECTED THE EQUIPMENT FROM THE VENDOR
     THEREOF ON THE BASIS OF SPECTRADYNE'S JUDGMENT AND EXPRESSLY DISCLAIMS ANY
     RELIANCE UPON ANY REPRESENTATIONS OR WARRANTIES MADE BY EDS OR ITS AGENTS.
     This disclaimer does not alter EDS's obligations under Article VIII of the
     Phase l ITS Agreement, which obligations are hereby reaffirmed (but not
     extended beyond the time frames provided for in such Phase l ITS Agreement)
     with respect to the Equipment to the extent such obligations exist as of
     January l, 1995.

9.4  No Waiver:  EDS Approval.  Any failure of EDS to require strict performance
     by Spectradyne, or any written waiver by EDS of any provision hereof, shall
     not constitute consent or waiver of any other breach of the same or any
     other provision hereof.

9.5  Purchase Option.  Provided Spectradyne is not in default hereunder,
     Spectradyne shall have the option to purchase, at the expiration of the
     Base Term or any Renewal Term, all of the Equipment at the greater of (i)
     the

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                                       10

 
                                                        Master Lease Number_____

     Residual Value or (ii) the fair market value.  As used herein with respect
     to the Equipment, "fair market value" means the value of such Equipment at
     the time Spectradyne gives its written notice to EDS to exercise this
     Purchase Option with respect to the Equipment, such value to be determined
     as follows:  EDS and Spectradyne shall in good faith each determine the
     fair market value of such Equipment.  If, within 30 days of the date of
     Spectradyne's notice to exercise this Purchase Option, EDS and Spectradyne
     cannot agree on the same fair market value for such Equipment, then within
     15 days of the expiration of such 30 day period, each of EDS and
     Spectradyne shall appoint one appraiser experienced in valuing items such
     as the Equipment.  If either party fails to notify the other party of the
     appointment of its appraiser within or by the time above specified, then
     the appointment of the second appraiser shall be made in the same manner as
     hereinafter provided for the appointment of a third appraiser in a case
     where the two appraisers appointed hereunder and the parties are unable to
     agree upon such appointment.  The appraisers so chosen shall meet within 10
     days after the second appraiser is appointed and if, within 30 days after
     such first meeting, the two appraisers shall be unable to agree upon the
     fair market value of such Equipment, they shall appoint a third appraiser
     who shall also be an expert in the valuation of items such as the
     Equipment; and in the event of their being unable to agree upon such
     appointment within 15 days, then such third appraiser shall be selected by
     the parties if they can agree thereon - within a further period of 15 days.
     If the parties do not so agree, then either party may apply to a court of
     competent jurisdiction for the appointment of such third appraiser.  In the
     event of the failure, refusal or inability of any appraiser to act, his
     successor shall be appointed within 10 days by the party who originally
     appointed him or in the event such party shall fail so to appoint such
     successor, or in case of the third appraiser, his successor shall be
     appointed as hereinbefore provided.  Within 30 days after the appointment
     of such third appraiser each of the three appraisers shall submit his
     determination of the fair market value of such Equipment. Notwithstanding
     anything to the contrary contained in this Section 9.5, if the
     determinations of the first two appraisers differ by 5% or less from the
     higher of the two appraisals, there shall be no third appraiser and the
     average of the determinations of the first two appraisers shall be binding
     and conclusive on the parties.  If the determinations of the first two
     appraisers shall differ to a greater extent, then the average of the
     appraisals rendered by all three appraisers shall be binding and conclusive
     on the parties.  If, however, the lowest or the highest of the three
     appraisals, or both, varies by more than 10% from the middle appraisal, the
     appraisal or appraisals so

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                                       11

 
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     varying shall be disregarded, and if only one appraisal remains, such
     appraisal shall be determinative and shall be binding and conclusive on the
     parties.  Each party shall pay the fees and expenses of its respective
     appraiser and both shall share the fees and expenses of the third
     appraiser, if any.  Written notice to EDS to exercise this Purchase Option
     shall be made at the same time as the Notice to Terminate is given to EDS.

9.6  Governing Law and Jurisdiction.  THIS PHASE l OPERATING LEASE IS MADE UNDER
     AND GOVERNED BY THE LAWS OF THE STATE OF TEXAS.  EDS AND SPECTRADYNE
     CONSENT TO THE JURISDICTION OF ANY LOCAL, STATE OR FEDERAL COURT LOCATED
     WITHIN THE STATE OF TEXAS, AND WAIVE ANY OBJECTION RELATING TO IMPROPER
     VENUE OR FORUM NON CONVENIENS TO THE CONDUCT OF ANY PROCEEDING IN ANY SUCH
     COURT.

9.7  Time.  Time is of the essence of this Lease, the Schedule and each and all
     provisions of each Lease.

9.8  Quiet Enjoyment.  So long as an Event of Default has not occurred and if
     occurred is not continuing, EDS and its assigns shall not interfere with
     Spectradyne's right of quiet use and enjoyment of the Equipment.

9.9  Survival of Certain Terms.  All obligations of Spectradyne to make payments
     to EDS under any lease, or to indemnify EDS, pursuant to the terms hereof
     shall survive termination of such Lease.

9.10 Phase 1 ITS Agreement.  Except as modified or amended in this Phase 1
     Operating Lease, the Phase l ITS Agreement will be, and remains, in full
     force and effect in accordance with it terms.  Where there is a conflict
     between the provisions this Phase l Operating Lease and the provisions of
     the Phase l ITS Agreement, this Phase 1 Operating Lease controls.  In
     addition, the provisions of the Phase 1 ITS Agreement regarding
     confidentiality (Section 11.8 thereof), dispute resolution (Article XII
     thereof) and public disclosure (Section 15.4 thereof) are incorporated
     herein and made a part hereof as if fully set out in this Phase 1 Operating
     Lease.

9.11 Relationship of Parties.  EDS is performing pursuant to this Phase l
     Operating Lease only as an independent contractor.  EDS has the sole
     obligation to supervise, manage, contract, direct, procure, perform or
     cause to be performed

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                                       12

 
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     its obligations set forth in this Phase l Operating Lease, except as
     otherwise agreed upon in writing by the parties.  Nothing set forth in this
     Phase 1 Operating Lease will be construed to create the relationship of
     principal and agent between EDS and Spectradyne.  EDS will not act or
     attempt to act or represent itself, directly or by implication, as an agent
     of Spectradyne or Spectradyne's customer(s) or in any manner assume or
     create, or attempt to assume or create, any obligation on behalf of, or in
     the name of, Spectradyne or Spectradyne's customer(s).

9.12 Legal Counsel.  Each of the parties hereto consulted, and was represented
     by, legal counsel.

SPECTRADYNE BY THE SIGNATURE BELOW OF ITS AUTHORIZED REPRESENTATIVE,
ACKNOWLEDGES THAT IT HAS READ THIS LEASE, UNDERSTANDS IT, AND AGREES TO BE BOUND
BY ITS TERMS AND CONDITIONS.

                              LESSEE:  SPECTRADYNE, INC.


                              By:_________________________________________
                              Name:_______________________________________
                              Title:______________________________________

                              Address:  1501 North Plano Road
                                        Richardson, Texas 75081

                              LESSOR:  ELECTRONIC DATA SYSTEMS 
                                        CORPORATION

                              By:_________________________________________
                              Name:_______________________________________
                              Title:______________________________________

                              Address:  5400 Legacy Drive
                                        Plano, Texas 75024

                                                          Lessee's initials_____

                                       13