INPUT OUTPUT INC
10-Q, 1996-10-02
MEASURING & CONTROLLING DEVICES, NEC
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============================================================================ 


                               UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                          WASHINGTON, D.C. 20549


                                FORM 10-Q


    [X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934       

         FOR THE QUARTERLY PERIOD ENDED: AUGUST 31, 1996

                                    OR 

    [ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
         SECURITIES EXCHANGE ACT OF 1934
         FOR THE TRANSITION PERIOD FROM _____________ TO ____________

         COMMISSION FILE NUMBER:  1-13402

                            INPUT/OUTPUT, INC.
           (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)


             DELAWARE                                   22-2286646     
   (STATE OR OTHER JURISDICTION OF                   (I.R.S. EMPLOYER  
    INCORPORATION OR ORGANIZATION)                  IDENTIFICATION NO.)


   11104 WEST AIRPORT BLVD., STAFFORD, TEXAS               77477       
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)              (ZIP CODE)    

   Registrant's telephone number, including area code: (713) 933-3339


Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 
1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports), and (2) has been subject to 
such filing requirements for the past 90 days. 
                                              Yes  [X]     No  [ ]     

At August 31, 1996 there were 43,049,801 shares of common stock, par value 
$0.01 per share, outstanding.


============================================================================ 
<PAGE>
                                      
                    INPUT/OUTPUT, INC. AND SUBSIDIARIES

                              INDEX TO FORM 10-Q
                   FOR THE QUARTER ENDED AUGUST 31, 1996


PART I.  Financial Information.                                     PAGE 
                                                                    ---- 
Item 1.  Financial Statements.

  Consolidated Balance Sheets
    August 31, 1996 and May 31, 1996...............................   2 

  Consolidated Statements of Operations
     Three months ended August 31, 1996 and 1995...................   3 

  Consolidated Statements of Cash Flows
     Three months ended August 31, 1996 and 1995...................   4 

  Notes to Consolidated Financial Statements.......................   5 

Item 2.  Management's Discussion and Analysis of Results of 
          Operations and Financial Condition.......................   8 

PART II.  Other Information.

Item 6.  Exhibits and Reports on Form 8-K..........................  10 









                                      1 
<PAGE>
                                      
                     INPUT/OUTPUT, INC. AND SUBSIDIARIES

                         CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE DATA)
                                 (UNAUDITED)

                                                  AUGUST 31,    MAY 31, 
                        ASSETS                      1996         1996   
                                                  ----------   -------- 
Current assets:
  Cash and cash equivalents.....................  $ 14,000    $ 34,252 
  Trade account receivables, net................    45,900      42,989 
  Trade notes receivable, net...................    46,193      28,424 
  Inventories...................................   100,601      92,787 
  Prepaid expenses..............................     2,210       2,004 
                                                  --------    -------- 
    Total current assets........................   208,904     200,456 
Long-term trade notes receivable................    21,718      16,678 
Deferred income tax asset.......................       327       1,062 
Property, plant and equipment, net..............    60,101      56,035 
Identified intangibles, net.....................    63,417      64,200 
Other assets....................................    19,460      17,034 
                                                  --------    -------- 
                                                  $373,927    $355,465 
                                                  --------    -------- 
                                                  --------    -------- 

   LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Current installments of long-term debt........  $    860    $     -- 
  Accounts payable, principally trade...........    15,733      19,518 
  Accrued expenses..............................    10,958      13,751 
  Income taxes payable..........................     3,136       1,962 
                                                  --------    -------- 
    Total current liabilities...................    30,687      35,231 
Long-term debt, excluding current installments..    11,690          -- 
Other liabilities...............................     3,110       3,030 
Stockholders' equity:
  Preferred stock, $.01 par value; authorized 
   5,000,000 shares, none issued................        --          -- 
  Common stock, $.01 par value; authorized 
   50,000,000 shares; issued 43,049,801 shares
   at August 31, 1996 and 42,969,676 shares at
   May 31, 1996.................................       430         430 
  Additional paid-in capital....................   215,570     214,259 
  Retained earnings.............................   113,806     104,145 
  Cumulative translation adjustment.............      (665)       (762)
  Unamortized restricted stock compensation.....      (701)       (868)
                                                  --------    -------- 
    Total stockholders' equity..................   328,440     317,204 
                                                  --------    -------- 
                                                  $373,927    $355,465 
                                                  --------    -------- 
                                                  --------    -------- 

        See accompanying notes to consolidated financial statements.



                                       2 
<PAGE>
                       INPUT/OUTPUT, INC. AND SUBSIDIARIES         

                      CONSOLIDATED STATEMENTS OF OPERATIONS        
                 (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)   
                                  (UNAUDITED)

                                                     FOR THE THREE MONTHS  
                                                       ENDED AUGUST 31,    
                                                   ----------------------- 
                                                      1996         1995    
                                                   ----------   ---------- 
Net sales and other revenues...................    $   73,004   $   54,758 
Cost of sales..................................        44,370       32,853 
                                                   ----------   ---------- 
  Gross profit.................................        28,634       21,905 
                                                   ----------   ---------- 
Operating expenses:
  Research and development.....................         5,890        4,567 
  Marketing and sales..........................         3,307        3,102 
  General and administrative...................         5,844        4,138 
  Amortization of identified intangibles.......         1,108          694 
                                                   ----------   ---------- 
    Total operating expenses...................        16,149       12,501 
                                                   ----------   ---------- 
Earnings from operations.......................        12,485        9,404 
Interest expense...............................            --         (868)
Other income...................................         1,723          880 
                                                   ----------   ---------- 
Earnings before income taxes...................        14,208        9,416 
Income taxes...................................         4,547        3,013 
                                                   ----------   ---------- 
Net earnings...................................    $    9,661   $    6,403 
                                                   ----------   ---------- 
                                                   ----------   ---------- 
Earnings per common share......................    $     0.22   $     0.17 
                                                   ----------   ---------- 
                                                   ----------   ---------- 
Weighted average number of common shares 
 outstanding...................................    43,941,921   37,837,228 
                                                   ----------   ---------- 
                                                   ----------   ---------- 


     See accompanying notes to consolidated financial statements.


                                       3 
<PAGE>
                                      
                    INPUT/OUTPUT, INC. AND SUBSIDIARIES

                   CONSOLIDATED STATEMENTS OF CASH FLOWS
                               (IN THOUSANDS)
                                (UNAUDITED)

                                                          THREE MONTHS ENDED  
                                                              AUGUST 31,      
                                                         -------------------- 
                                                           1996       1995    
                                                         --------   --------- 
Cash flows from operating activities:
  Net earnings.......................................    $  9,661   $   6,403 
  Adjustments to reconcile net earnings to net 
   cash used in operating activities:
    Depreciation and amortization....................       2,925       2,132 
    Amortization of restricted stock compensation....         167         446 
    Deferred income taxes............................         735      (1,533)
    Pension costs....................................         107          75 
    Changes in assets and liabilities:
      Receivables....................................     (25,798)    (23,127)
      Inventories....................................      (7,814)     (6,481)
      Leased equipment...............................         557         428 
      Accounts payable and accrued expenses..........      (6,578)     14,313 
      Income taxes payable...........................       1,174       2,416 
      Other..........................................      (1,106)     (1,276)
                                                         --------   --------- 
      Net cash used in operating activities..........     (25,970)     (6,204)
Cash flows from investing activities:
  Purchases of property, plant, and equipment........      (6,397)     (2,255)
  Acquisition of net assets and business.............          --    (121,296)
  Investment in other assets.........................      (2,008)       (248)
                                                         --------   --------- 
  Net cash used in investing activities..............      (8,405)   (123,799)
Cash flows from financing activities:
  Borrowing from bank................................      12,550      70,000 
  Exercise of stock options..........................       1,311       2,818 
                                                         --------   --------- 
      Net cash provided by financing activities......      13,861      72,818 
Effect of foreign currency fluctuations..............         262          -- 
                                                         --------   --------- 

Net decrease in cash and cash equivalents............     (20,252)    (57,185)

Cash and cash equivalents at beginning of quarter....      34,252      57,392 
                                                         --------   --------- 
Cash and cash equivalents at end of quarter..........    $ 14,000   $     207 
                                                         --------   --------- 
                                                         --------   --------- 


        See accompanying notes to consolidated financial statements.




                                      4 
<PAGE>

                    INPUT/OUTPUT, INC. AND SUBSIDIARIES

                NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                 (UNAUDITED)


(1)  GENERAL

     The consolidated financial statements included herein have been prepared 
by the Company, without audit, pursuant to the rules and regulations of the 
Securities and Exchange Commission. The financial statements reflect all 
adjustments (consisting of normal recurring accruals) which are, in the 
opinion of management, necessary to fairly present such information. Although 
the Company believes that the disclosures are adequate to make the 
information presented not misleading, certain information and footnote 
disclosures, including significant accounting policies, normally included in 
financial statements prepared in accordance with generally accepted 
accounting principles have been omitted pursuant to such rules and 
regulations. It is suggested that these financial statements be read in 
conjunction with the consolidated financial statements and the notes thereto, 
as well as Item 7. - "Management's Discussion and Analysis of Results of 
Operations and Financial Condition," included in the Company's annual report 
on Form 10-K filed for the year ended May 31, 1996.

(2)  INVENTORIES

     Inventories are stated at the lower of cost (primarily first-in, first-out)
or market. A summary of inventories follows (in thousands):

                                            AUGUST 31,   MAY 31, 
                                              1996        1996   
                                            ----------   ------- 
Raw materials...........................    $ 66,406     $47,280 
Work-in-process.........................      32,035      29,016 
Finished goods..........................       2,160      16,491 
                                            --------     ------- 
                                            $100,601     $92,787 
                                            --------     ------- 
                                            --------     ------- 

(3)  STATEMENTS OF CASH FLOWS

     The Company considers all highly liquid investments purchased with an 
original maturity of three months or less to be cash equivalents.  The 
Company does not invest or intend to invest in derivative securities.  
Similar investments with original maturities beyond three months are 
considered short-term investments available for sale or carried at market. 
Exchange rate fluctuations have not had a material effect on the Company's 
Statements of Cash Flows.

     Supplemental disclosures of cash flow information for the three months 
ended August 31, 1996 and 1995 follow (in thousands): 

                                                   1996    1995  
                                                  ------   ----- 
Cash paid during the periods for:

  Interest (net of amount capitalized).........   $   --   $  -- 
                                                  ------   ----- 
  Income taxes.................................   $2,218   $ 399 
                                                  ------   ----- 
                                                  ------   ----- 

                                      5 
<PAGE>

                    INPUT/OUTPUT, INC. AND SUBSIDIARIES

                NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                 (CONTINUED)
                                 (UNAUDITED)

(4)  LONG TERM DEBT

     In August 1996, the Company, through one of its wholly-owned 
subsidiaries, obtained a $12.6 million, ten-year term loan secured by certain 
of its land and buildings located in Stafford, Texas which includes the 
Company's executive offices, research and development headquarters, and 
newly-constructed electronics manufacturing building.  The term loan, which 
the Company has guaranteed under a Limited Guaranty, bears interest at a 
fixed rate of 7.875% per annum.  The Company leases all of the property from 
its subsidiary under a master lease, which lease has been collaterally 
assigned to the lender as security for the term loan.  The term loan provides 
for penalties for prepayment prior to maturity.

(5)  INCOME TAXES

     Components of income tax expense for the three months ended August 31, 
1996 and 1995 follow (in thousands):

                                              1996     1995   
                                             ------   ------- 
Current:
  Federal.................................   $2,968   $ 3,408 
  Foreign.................................      568       956 
  State and local.........................      276       182 
Deferred - federal........................      735    (1,533)
                                             ------   ------- 
                                             $4,547   $ 3,013 
                                             ------   ------- 
                                             ------   ------- 







                                      6 
<PAGE>

                    INPUT/OUTPUT, INC. AND SUBSIDIARIES

                NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                 (CONTINUED)
                                 (UNAUDITED)


A reconciliation of the expected income tax expense on earnings using the 
statutory Federal income tax rate of 35% to the income tax reported herein 
for the three months ended August 31, 1996 and 1995 follows (in thousands):

                                                         1996      1995  
                                                        ------    ------ 
Expected income tax expenses.........................   $4,973    $3,296 
Tax benefit from use of foreign sales corporation....     (600)     (432)
Foreign tax credit...................................       31        58 
Foreign taxes........................................     (151)       42 
State and local taxes................................      179       118 
Research and development credit......................     (168)       -- 
Other................................................      283       (69)
                                                        ------    ------ 
                                                        $4,547    $3,013 
                                                        ------    ------ 
                                                        ------    ------ 

     The tax effects of the cumulative temporary differences resulting in the 
net deferred income tax asset follow (in thousands):

                                                      AUGUST 31,    MAY 31, 
                                                         1996        1996   
                                                      ----------    ------- 
     Accrued expenses..............................    $(1,545)     $(1,351)
     Allowance accounts............................       (859)      (1,053)
     Unamortized restricted stock compensation.....       (955)      (1,711)
     Uniform capitalization........................       (536)        (409)
        Total deferred income tax assets...........     (3,895)      (4,524)

        Valuation allowance........................         --           -- 

        Total deferred income tax asset, net.......     (3,895)      (4,524)

     Basis in identified intangibles...............      2,157        2,075 
     Basis in property, plant and equipment........        328          150 
     Other.........................................      1,083        1,237 
        Total deferred income tax liabilities......      3,568        3,462 
                                                      --------      ------- 
     Total deferred income tax (asset), net........   $   (327)     $(1,062)
                                                      --------      ------- 
                                                      --------      ------- 


                                      7 
<PAGE>

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS 
          AND FINANCIAL CONDITION

RESULTS OF OPERATIONS

     NET SALES AND OTHER REVENUES.  The Company's first quarter net sales and 
other revenues increased by $18.2 million, or 33.3%, to $73.0 million 
compared to the prior year's first quarter. The increase in sales revenue was 
primarily due to the sale of six I/O SYSTEM TWO MRX and three RSR systems to 
geophysical contractors in Canada, Russia, Ukraine, Venezuela and the United 
States. In addition, there were sales of over 400 marine I/O SYSTEM TWO MSX 
streamers and energy sources during the first quarter. The prior year's first 
quarter net sales and other revenues principally consisted of six system 
sales to geophysical contractors in Russia and the first I/O SYSTEM TWO RSR 
system, as well as the contribution of $20.1 million in sales of products 
from the Western Exploration Products Group (WGEP) product lines acquired by 
the Company in June 1995 from Western Atlas, Inc. (the "WGEP Acquisition"). 
The Company's results for the three-month period ended August 31, 1996 
reflect a full quarter's operations giving effect to the WGEP Acquisition, 
while the results for the quarter ended August 31, 1995 reflect only two 
months of such combined operations.

     GROSS PROFIT MARGIN.  The Company's first quarter gross profit margins 
were adversely affected by changes in the sales mix and sales of lower margin 
products from product lines acquired in the WGEP Acquisition. First quarter 
profit margins declined from 40.0% for the prior fiscal year's first quarter 
to 39.2%.

     OPERATING EXPENSES.  Operating expenses increased $3.6 million or 29.2%, 
for the first quarter over the prior year's first quarter operating expenses. 
Research and development expenses increased $1.3 million, or 29.0%, primarily 
due to increased personnel and related costs resulting from the WGEP 
Acquisition. Marketing and sales expenses increased $205,000, or 6.6% 
primarily due to increased personnel and related costs resulting from the 
WGEP Acquisition, and increased advertising expenses offset by decreased 
third party commissions. General and administrative expenses increased $1.7 
million, or 41.2%, primarily due to increased non-recurring professional 
fees, increases in state and local taxes derived from increased levels of 
property and assets resulting from the WGEP Acquisition, increased data 
processing expenses, and increased depreciation expense. Amortization of 
identified intangibles increased $414,000 or 59.7%, primarily due to goodwill 
resulting from the WGEP Acquisition.

     INTEREST EXPENSE.  Interest expense for the first quarter of fiscal 1997 
was nil and $868,000 for the first quarter of fiscal 1996 primarily due to 
interest on the $70 million term indebtedness incurred in June 1995 in 
connection with the WGEP Acquisition.  These borrowings were repaid in 
November 1995.

     INCOME TAX EXPENSE.  The Company's effective income tax rate was 
approximately 32%, both for the first quarter of fiscal 1997 and the first 
quarter of fiscal 1996.










                                      8 
<PAGE>

LIQUIDITY AND CAPITAL RESOURCES

     The Company has financed its operations from internally generated cash 
flow, its credit facilities, and funds from equity financings. Cash flows 
from operating activities before changes in working capital items were a 
positive $13.6 million for the three months ended August 31, 1996. However, 
cash flows from operating activities after changes in working capital items 
were a negative $26.0 million for the three months ended August 31, 1996 
primarily due to increases in trade accounts, notes receivable and inventory 
required to support increased sales levels, along with a decrease in accounts 
payable. The Company believes that it has sufficient credit facilities in 
place to finance these increases in its working capital requirements.  As of 
August 31, 1996 the Company has no borrowings outstanding under its revolving 
line of credit.

     As of August 31, 1996, total trade notes receivable had increased $22.8 
million over the corresponding amount outstanding at May 31, 1996, reflecting 
the increased levels of Company-financed sales during the first three months 
of fiscal 1997. The Company expects that these increased levels of 
Company-financed sales will continue for the foreseeable future.  For 
information concerning the Company's sales finance activities, see "Item 1. - 
Business-Markets and Customers" of the Company's Annual Report on Form 10-K 
for the year ended May 31, 1996.

     In August 1996, a subsidiary of the Company borrowed $12,550,000 in 
long-term financing secured by the land, buildings and improvements housing 
the Company's executive offices, research and development headquarters and 
new manufacturing facility in Stafford, Texas.  The loan bears interest at 
the rate of 7.875% per annum and is repayable in equal monthly installments 
of principal and interest of $151,439.  The promissory note, which matures on 
September 1, 2006, contains prepayment penalties.  See Note (4) - Long-Term 
Debt of the Notes to Consolidated Financial Statements.

     The Company anticipates expenditures for the current fiscal year for 
exploration and development of oil and gas properties to be approximately $6 
million and expects to fund this level of expenditures through cash flows 
from operations. Actual levels of exploration and development expenditures 
may vary significantly due to many factors, including oil and gas prices, 
industry conditions, and the success of the Company's exploration and 
development projects. The Company's exploration and development projects are 
operated by third parties which control the timing and amount of expenditures 
required to exploit the participant's interests in these prospects. The 
Company expects to participate in the drilling and completion of six wells in 
fiscal 1997. The Company's participation in oil and gas activities is 
accounted for on a full cost basis.

     Capital expenditures for property, plant, and equipment totaled $10.2 
million for fiscal 1996 and $6.4 million for the first three months of fiscal 
1997, and are expected to aggregate $26.5 million for fiscal 1997. As noted 
above, the Company concluded in August 1996 a long-term credit facility of 
$12.6 million to assist in financing the costs of land and improvements in 
Stafford, Texas. The Company believes that the combination of its existing 
working capital, unused credit available under its working capital credit 
facility, internally generated cash flow and access to other financing 
sources will be adequate to meet its anticipated capital and liquidity 
requirements for the foreseeable future.




                                      9 
<PAGE>

PART II - OTHER INFORMATION.

     ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

              (a)  List of documents filed as Exhibits

                     10.1   - Promissory Note dated August 29, 1996 executed by
                              IPOP Management, Inc. to the order of The Variable
                              Annuity Life Insurance Company.

                     10.2   - Master Commerical Lease Agreement dated August 29,
                              1996, by and between IPOP Management, Inc. and The
                              Variable Annuity Life Insurance Company.

                     10.3   - Limited Guaranty dated August 29, 1996, executed 
                              by Input/Output, Inc.

                     27     - Financial Data Schedule.

              (b)  Reports on Form 8-K

                     No reports on Form 8-K were filed by Input/Output, Inc. 
                     during the quarter ended August 31, 1996.


















                                      10 
<PAGE>

                                  SIGNATURES

PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THE 
REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON ITS BEHALF BY THE 
UNDERSIGNED THEREUNTO DULY AUTHORIZED.

                                       INPUT/OUTPUT, INC.


                                       By:      /s/  Robert P. Brindley      
                                          ---------------------------------- 
                                          Robert P. Brindley
                                          Senior Vice President, Chief 
                                          Financial Officer and Secretary
                                          (Principal Financial and 
                                          Accounting Officer)

Dated: September 27, 1996


















                                      11 

<PAGE>

                                   PROMISSORY NOTE

$12,550,000.00                      Houston, Texas               August 29, 1996

     1.   FOR VALUE RECEIVED, the undersigned IPOP MANAGEMENT, INC., a Delaware
corporation (hereinafter called "MAKER"), with offices at 11104 West Airport
Boulevard, Suite 200, Stafford, Texas 77477, hereby agrees and promises to pay
to the order of THE VARIABLE ANNUITY LIFE INSURANCE COMPANY, a Texas
corporation, (which along with subsequent holders of this Note, and their
successors or assigns, is hereinafter called "PAYEE"), at 2929 Allen Parkway,
34th Floor, Houston, Harris County, Texas 77019, Attention: Director - Mortgage
Loans, or at such other place as Payee may from time to time designate in
writing, the principal sum of TWELVE MILLION FIVE HUNDRED FIFTY THOUSAND AND
NO/100 DOLLARS ($12,550,000.00) in lawful money of the United States of America,
with interest on the principal balance from time to time remaining unpaid from
the date of advancement until maturity at the rate of seven and seven-eights
percent (7.875%) per annum, said principal and interest being payable in the
manner and form as follows:

     a.   An installment of interest on the unpaid principal balance hereof from
          the       date of funding through August 31, 1996, shall be due and
          payable at the funding of this Note.

     b.   Thereafter, this Note shall be payable in one hundred nineteen (119)
          consecutive monthly installments of principal and interest in the
          amount of $151,439.00 each (calculated on the basis of a 360-day year
          and an amortization period of ten (10) years); the first installment
          shall be due and payable on October 1, 1996, and a like installment
          shall be due and payable on the first day of each of the next one
          hundred eighteen (118) calendar months.

     c.   A FINAL INSTALLMENT IN THE AMOUNT OF THE ENTIRE UNPAID PRINCIPAL
          BALANCE HEREOF TOGETHER WITH ACCRUED AND UNPAID INTEREST THEREON SHALL
          BE DUE AND PAYABLE ON SEPTEMBER 1, 2006 (THE "MATURITY DATE").

     2.   Each payment shall be credited first to prepayment fees or other
charges hereunder (other than interest), then to accrued interest and the
remainder to the unpaid principal on this Note, and interest shall thereupon
cease upon the principal so credited.

     3.   Should default be made in payment of any of the indebtedness evidenced
hereby, after the entire principal amount hereof shall have become due and
payable, whether by acceleration, at maturity or otherwise, the entire unpaid
principal balance and accrued, but unpaid,  interest on this Note shall bear
interest at the lesser of (i) the Maximum Lawful Rate (as hereinafter defined)
or (ii) the rate of eighteen percent (18%) per annum.

     4.   In the event that any payment required hereunder or under the
"SECURITY INSTRUMENTS" (as hereinafter defined) shall not be made within ten
(10) days after the date due, a late charge equal to the lesser of (i) an amount
which, when added to all other amounts constituting "interest" under applicable
state or federal law, does not exceed the Maximum Lawful Rate or (ii) four
percent (4%) of the amount of any such delinquent payment so overdue, may be
charged by Payee for the purpose of defraying the expense incident to handling
such delinquent payment.  Such late charge represents the reasonable estimate of
Payee and Maker of a fair average compensation for the loss that may be
sustained by Payee due to the failure of Maker to make timely payments.  Such
late charge shall be paid without prejudice to the right of Payee to collect any
other amounts provided to be paid or to declare a default hereunder or under the
Security Instruments.



                                  Page 1 of 5


<PAGE>

     5.   Prepayment of this Note shall be permitted only in accordance with the
following terms and conditions:

          (1)  Maker shall have the right to prepay the entire outstanding
principal balance (but not any lesser amount) of this Note on any regular
monthly installment date for the payment of principal and interest hereunder,
provided that (i) Payee shall have received at least sixty (60) days' prior
written notice (the "NOTICE") of such full prepayment, (ii) at the time
specified in the Notice for any prepayment there shall be no default under this
Note or under any of the other Security Instruments, and (iii) such prepayment
is accompanied by a prepayment fee in an amount equal to the lesser of (x) an
amount which, when added to all other sums received, charged, or contracted for
by Payee which are interest or are deemed to be interest by applicable laws,
does not exceed the maximum non-usurious rate that may be received, charged, or
contracted for by Payee under applicable laws from time to time in effect (the
"MAXIMUM LAWFUL RATE") or (y) the greater of an amount calculated as set forth
in Paragraphs (a) or (b) (as applicable), below:

               (a)  at the time of receipt by Payee of the Notice, the
difference between (i) the then present value of all unpaid installments of
principal and interest due and payable under this Note, calculated from the date
of the proposed prepayment to the Maturity Date, discounted at the "Reinvestment
Rate" (as hereinafter defined), and (ii) the outstanding principal balance under
this Note on the date of the proposed prepayment; or

               (b)  one percent (1%) of the then outstanding principal balance
of this Note.

As used in this Note, "REINVESTMENT RATE" shall be the yield to maturity on a
United States treasury bond or note (the choice of which security to be used for
such purposes being in the sole discretion of Payee) having maturity date of
September 1, 2006 (or the maturity date closest thereto if no such bond or note
has a maturity date of September 1, 2006).

          (2)  If Payee shall at any time come into possession of proceeds
resulting from an acceleration of the maturity of this Note, tender prior to
foreclosure, foreclosure, or any other reason, (other than application of
insurance or condemnation proceeds) such possession shall be deemed to be and
shall be treated as a voluntary prepayment hereunder and consequently there
shall be added to the outstanding unpaid principal sum of this Note as
additional indebtedness immediately due and payable hereunder and secured by the
Security Instruments, a prepayment fee calculated pursuant to Paragraph 5.(1)
above.  There shall be no prepayment penalty or premium in connection with the
application of insurance proceeds or condemnation awards.

          (3)  Upon receipt by Payee of the Notice, Payee shall, within thirty
(30) days thereafter, give notice to Maker of the Reinvestment Rate and, if
applicable, the amount of the prepayment fee payable under Paragraph 5.(1)
above.  Determination of the Reinvestment Rate and the amount of any such
prepayment fee by Payee shall be binding on Maker absent manifest mathematical
error.

          (4)  If Maker gives Payee the Notice as herein provided and thereafter
fails to prepay this Note (with payment of the applicable prepayment fee) at the
time specified in the Notice, such failure shall constitute  a default hereunder
and, without further notice by Payee, entitle Payee, at its option, to
accelerate the maturity of this Note and exercise any and all remedies available
to Payee under the Security Instruments.

          (5)  Notwithstanding any provisions to the contrary contained herein,
there shall be no prepayment premium or fee payable hereunder with respect to
prepayments made in accordance with the 



                                  Page 2 of 5


<PAGE>

terms hereof during the last ninety (90) days prior to the Maturity Date 
provided that Payee shall have timely received the Notice.

     6.   This Note is secured by all security interests, rights, titles, liens,
assignments, claims and equities, whether expressed or implied (the "SECURITY
INSTRUMENTS") executed by Maker (or any other party) in favor of Payee
pertaining to and securing this Note, including those executed simultaneously
herewith, those executed heretofore and those executed hereafter, and including
specifically, and without limitation, that certain Deed of Trust and Security
Agreement of even date herewith (the "DEED OF TRUST") executed by Maker covering
approximately 15.26 acres of land in Stafford, Fort Bend County, Texas, together
with all buildings and improvements now or hereafter erected thereon
(hereinafter called the "MORTGAGED PROPERTY"), all as more fully set forth and
described in such instrument.  This Note is additionally secured by that certain
Limited Guaranty of even date herewith executed by Input/Output, Inc. (the
"Guarantor").

     7.   It is expressly agreed that time is of the essence of this agreement,
and this Note shall become immediately due and payable at the option of Payee,
without presentment or demand or any notice (including, without limitation,
notice of intent to accelerate or notice of acceleration) to Maker, (i) on
Maker's failure to pay any installment hereon on the date such installment is
due, (ii) upon an event of default under the terms of any Security Instrument,
or (iii) if any event occurs or condition exists which authorizes the
acceleration of maturity hereof under any agreement made by Maker in connection
with the Security Instruments.  Upon the occurrence of any such event, Payee
shall also have the right to exercise any and all other rights, remedies and
recourses now or hereafter existing under any Security Instrument, in equity or
at law, by virtue of statute or otherwise, including, but not limited to, the
right to foreclose any and all liens securing this Note.  Failure to exercise
any such option, rights or remedies shall not constitute a waiver on the part of
Payee of the right to exercise said option, right or remedy at any other time.

     8.   If (i) Payee retains an attorney to collect, enforce or defend this
Note or any of the other Security Instruments or (ii) Payee shall become a
party, either as plaintiff or as defendant, in any suit or legal proceeding in
relation to the Mortgaged Property or any of the other collateral securing
payment of this Note (the "OTHER COLLATERAL"), or (iii) Maker or any subsequent
owner of an interest in the Mortgaged Property or the Other Collateral is the
subject of any bankruptcy, probate or receivership proceeding, or (iv) Maker or
anyone claiming by, through, or under Maker (including without limitation any
subsequent owner of an interest in the Mortgaged Property or the Other
Collateral) sues Payee in connection with this Note or any of the Security
Instruments and does not prevail against Payee, then in any such event Maker
agrees to pay to Payee, in addition to principal and interest, all reasonable
costs and expenses incurred by Payee in connection with such collection,
enforcement, defense, suit or proceeding, including without limitation
reasonable attorneys' fees, regardless of whether incurred in connection with
any bankruptcy, probate, receivership or other court proceedings (whether at the
trial or the appellate level).

     9.    It is the intention of the parties hereto to comply with the usury
laws of the State of Texas and of the United States of America; accordingly, it
is agreed that notwithstanding any provision to the contrary in this Note or in
any Security Instrument, no such provision shall require the payment of or
permit the collection of interest in excess of the Maximum Lawful Rate. If any
excess of interest in such respect is provided for, or shall be adjudicated to
be so provided for, in this Note or in any Security Instrument, whether as a
result of prepayment, acceleration of maturity or otherwise, then in such event
(a) the provisions of this paragraph shall govern and control, (b) neither the
Maker nor its successors or assigns or any other party liable for the payment
hereof shall be obligated to pay the amount of such interest to the extent that
it is in excess of the Maximum Lawful Rate, and the same shall be construed as a
mutual mistake of the parties and, (c) any such excess which may have been
collected shall be, at the option of Payee, either applied as a credit against
the then unpaid principal amount hereof or refunded to Maker.  Maker hereby
agrees to pay an 



                                  Page 3 of 5


<PAGE>

effective rate of interest that is the sum of the interest rate provided for 
herein, together with any additional rate of interest resulting from any 
other charges of interest or in the nature of interest paid or to be paid in 
connection with the loan evidenced hereby, including without limitation any 
commitment fee and any other fees to be paid by Maker pursuant to the 
provisions of the Security Instruments and any commitment relating to the 
loan evidenced hereby.  All sums paid or agreed to be paid the Payee or 
holder of this Note for the use, forbearance or detention of the indebtedness 
evidenced hereby shall, to the extent permitted by the usury laws applicable 
to this loan transaction, be amortized, prorated, allocated and spread 
throughout the full term of this Note.

     10.  Maker and all sureties, endorsers, and guarantors of this Note jointly
and severally (i) waive demand, presentment for payment, notice of non-payment,
protest, notice of protest, notice of intent to accelerate, notices of
acceleration and all other notice, filing of suit and diligence in collecting
this Note or enforcing any of the security herefor, (ii) agree to any
substitution, exchange or release of any party primarily or secondarily liable
hereon, (iii) agree that Payee shall not be required first to institute suit or
exhaust its remedies hereon against Maker or others liable or to become liable
hereon or to enforce its rights against any security hereof in order to enforce
payment of this Note by them, and (iv) consent to any extension or postponement
of time of payment of this Note and to any other indulgence with respect hereto
without notice thereof to any of them.

     11.  [Intentionally Deleted.]

     12.  By its execution of this Note, Maker warrants and represents to Payee
that the loan proceeds will be utilized exclusively for commercial, investment,
or business purposes, and no loan proceeds will be used for personal, family, or
household purposes.

     13.  THIS NOTE IS EXECUTED IN THE STATE OF TEXAS AND SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS, EXCEPT AS
PREEMPTED OR CONTROLLED BY THE LAWS OF THE UNITED STATES OF AMERICA.

     14.  Maker acknowledges that the Deed of Trust securing this Note contains
certain provisions restricting the conveyance, transfer or further conveyance or
further encumbrance of the Mortgaged Property.

     15.  This Note is intended to be performed in accordance with and only to
the extent permitted by all applicable law. If any portion of this Note or the
application thereof to any person or circumstance shall, for any reason and to
any extent be invalid or unenforceable, neither the remainder of this instrument
nor the application of such provisions to other persons or circumstances shall
be affected thereby, but rather shall be enforced to the greatest extent
permitted by law.

     16.  The liability of Maker for failure to perform Maker's obligations
hereunder or under the Deed of Trust and the other Security Instruments is
expressly limited to the security for payment of this Note, the same being all
properties, rights, and estates subject to the Security Instruments, and Payee
agrees not to seek any damages or money judgment against Maker for any default
on the part of Maker under this Note or any of the Security Instruments. 
Notwithstanding anything to the contrary contained in this Note or in any of the
Security Instruments, and notwithstanding any delay on the part of Payee in
exercising any right, power or remedy in connection with any default under this
Note, the Deed of Trust or any of the other Security Instruments, Payee shall
have full recourse against Maker, and Maker shall be personally liable for and
shall promptly account (by delivery of funds) to Payee for (a) all condemnation
awards and proceeds and insurance proceeds received by Maker or Guarantor (to
the extent same have not theretofore been applied toward 



                                  Page 4 of 5


<PAGE>

payment of the sums due under this Note or used for repair of the Mortgaged 
Property and, with respect to such insurance proceeds which represent 
proceeds paid under any rent insurance, business interruption insurance or 
other similar types of insurance, to the additional extent such rent, 
business interruption or other similar insurance proceeds have not 
theretofore been applied toward the payment of taxes and insurance premiums); 
(b) all amounts necessary to repair any damage to the Mortgaged Property, 
excluding normal wear and tear,  caused by acts or omissions of Maker, its 
agents, employees, or contractors (c) all security deposits; (d) failure to 
pay, in accordance with the Deed of Trust, taxes, assessments or other 
charges which can create liens on any portion of the Mortgaged Property or 
the Other Collateral and are payable hereunder or under the Security 
Instruments (to the full extent of any such taxes, assessments or other 
charges); (e) failure to pay charges for labor or materials or other charges 
which can create liens on any portion of the Mortgaged Property or the Other 
Collateral (to the full extent of the amount rightfully claimed by any such 
claimant); (f) prepaid rent and rental or other income derived from the 
Mortgaged Property or the Other Collateral from and after the occurrence of a 
default under this Note or the Security Instruments (whether any of such 
condemnation awards, insurance proceeds, income or other funds derived from 
the Mortgaged Property are held by Payee or received by Maker); (g) any loss 
incurred by Payee as a result of Maker's forfeiture of the Mortgaged Property 
resulting from criminal activity by any person whether or not such criminal 
activity is conducted on or in any manner relates to the Mortgaged Property 
or the Other Collateral; and (h) all sums due Payee, excluding payments of 
principal and accrued interest due pursuant to this Note,  following exercise 
by Payee of its right to perform Maker's obligations under the Security 
Instruments to preserve, protect or defend the Mortgaged Property as collateral
for this Note after notice and opportunity to cure, if any, as provided in 
the Security Instruments. Additionally, Payee shall have the right to off-set 
against any funds held by Payee (including, without limitation, escrows for 
taxes and insurance) pursuant to this Note and any of the Security Instruments.
Nothing herein contained shall be construed to prevent Payee from exercising 
and enforcing any other remedy allowed at law or in equity or by any statute 
or by the terms of this Note or the Security Instruments nor shall anything 
herein contained be deemed to be a release or impairment of the Deed of Trust,
any of the other Security Instruments or the indebtedness evidenced by this 
Note or secured thereby or shall be deemed to prejudice the right of Payee as 
against Maker or any other entity now or hereafter liable under any guaranty, 
bond, or lease covering the Mortgaged Property, the Other Collateral or any 
portion thereof, policy of insurance or other agreement which Maker may have 
delivered to Payee in compliance with any of the terms, covenants, and 
conditions of this Note or any of the Security Instruments, or preclude the 
Payee from exercising its right to foreclose under the Deed of Trust or any 
of the other Security Instruments (either by judicial means or non-judicial 
means) in the event of a default under this Note or any of the Security 
Instruments, or except as may be limited by the foregoing provisions of this 
paragraph, from enforcing any of the Payee's rights under this Note or under 
any of the Security Instruments including, without limitation, the right to the
appointment of a receiver for the Mortgaged Property or the Other Collateral, or
limit the rights or remedies which Payee would otherwise be entitled to at law 
or in equity absent the limitation of liability provisions set forth in this 
paragraph against Maker for fraud perpetrated by Maker against Payee.  In 
addition, notwithstanding any other provisions of this Note or the Security 
Instruments, the Maker shall be personally liable for any loss, damage or 
injury sustained by Payee arising from the breach of any warranty or 
representation contained in any affidavit made by or on behalf of Maker or in 
any of the Security Instruments regarding hazardous wastes or other hazardous or
toxic substances, including, but not limited to, any breach of the warranties, 
representations, covenants or indemnities contained in Article 11 of the Deed of
Trust relating to "Hazardous Materials" (as therein defined).


                                       IPOP MANAGEMENT, INC.,
                                       a Delaware corporation

                                       By: /s/ Robert P. Brindley
                                           -----------------------------------
                                           President/Secretary




                                  Page 5 of 5


<PAGE>
                        MASTER COMMERCIAL LEASE AGREEMENT


     THIS MASTER COMMERCIAL LEASE AGREEMENT (the "Lease"), made and entered into
as of the 29th day of August, 1996, by and between IPOP MANAGEMENT, INC., a
Delaware corporation ("Landlord") and INPUT/OUTPUT, INC., a Delaware corporation
("Tenant").


                              W I T N E S S E T H:


     Subject to the terms, provisions, and conditions of this Lease, and each in
consideration of the duties, covenants, and obligations of the other hereunder,
Landlord hereby leases, demises, and lets the Premises (as hereinafter defined)
to Tenant and Tenant hereby leases the Premises from Landlord.  

                                    ARTICLE I

                                   DEFINITIONS

     1.1  DEFINITIONS.  For purposes of this Lease, the following terms shall
have the meanings respectively indicated:  

          "BANKRUPTCY EVENT" means the occurrence of one or more of the
following: (i)  Tenant shall seek, consent to or not contest the appointment of
a receiver, trustee, or liquidator for itself or for all or any substantial part
of its property, (ii) Tenant shall voluntarily file a petition seeking relief
under the bankruptcy or other debtor relief laws of the United States in any
state or competent jurisdiction, (iii) Tenant shall make a general assignment
for the benefit of its creditors, (iv) an involuntary petition is filed against
Tenant seeking relief under the bankruptcy or other debtor relief laws of the
United States in any state or competent jurisdiction, or a court of competent
jurisdiction enters an order, judgment or decree appointing, without the consent
of Tenant, a receiver, trustee or liquidator for Tenant, or for all or any
substantial part of its property, and in either event, such petition, order,
judgment or decree shall not be and remain dismissed within a sixty (60) day
period after its filing or entry.

          "BUILDINGS" means collectively the Office Buildings and the New
Building, together containing approximately 281,439 square feet of gross outside
area of office, manufacturing, warehouse and/or commercial space and the
associated parking lots and infrastructure serving same, located upon the Site. 

          "COMMENCEMENT DATE"  means August 29, 1996.

          "EXISTING LEASES" shall mean those certain existing Lease Agreements
between Landlord and the Existing Tenants with respect to space in the Office
Buildings, as more fully described on EXHIBIT B attached hereto and incorporated
herein for all purposes.

          "EXISTING TENANTS" shall mean the tenants described in the Existing
Leases.


<PAGE>

          "FAIR MARKET VALUE OF THE MORTGAGED PROPERTY" has the meaning given to
such term in SECTION 19.4C.

          "FIRST MORTGAGE" means that certain Deed of Trust and Security
Agreement dated August 29, 1996, executed by Landlord for the benefit of
Mortgagee, and covering the premises.

          "MORTGAGEE" means The Variable Annuity Life Insurance Company, and its
successors and assigns, as the mortgagee under the First Mortgage.

          "NEW BUILDING" means that certain 110,000 square foot manufacturing
office and warehouse facility being constructed and to be occupied by Tenant,
situated on Tract I described in EXHIBIT A attached hereto.

          "PRE-FORECLOSURE DEBT" means the Indebtedness (as defined in the First
Mortgage) due and owing to Mortgagee immediately prior to any foreclosure of the
lien of the First Mortgage, including, but not limited to, the aggregate of the
outstanding principal balance of the Note (as defined in the First Mortgage),
the accrued interest and any other accrued but unpaid portion of the
Indebtedness and any and all costs, fees, expenses, attorney's fees and other
amounts due and owing and constituting part of the Indebtedness. 

          "PREMISES" means the Building and the Site.

          OFFICE BUILDINGS" means these two (2) office buildings currently
occupied by Tenant and the Existing Tenants, under the Existing Leases, situated
on Tracts II and III described as EXHIBIT A attached hereto.

          "SITE" means that certain real property situated in Fort Bend County,
Texas, more particularly described in EXHIBIT "A" attached hereto and
incorporated herein for all purposes, and all right, title, and interest of the
Landlord, if any, in and to any land lying in the bed of any street, road or
avenue, open or proposed, in front of or adjoining said land and in and to the
easements, franchises, rights, appendages and appurtenances.  

          "TERMINATION EVENT" occurs when Mortgagee forecloses the lien of the
First Mortgage and no Bankruptcy Event has occurred and is continuing.

          "TERMINATION FEE" means the Termination Fee determined in accordance
with SECTION 19.4A OR B, as appropriate.

                                   ARTICLE II

                                      TERM

     2.1  TERM.  This Lease shall continue in force for a term (the "Term") of
120 months commencing  on the 29th day of August, 1996, and ending on the 1st
day of September, 2006, unless sooner terminated or extended as herein provided.



                                    -2-


<PAGE>

                                   ARTICLE III

                                      RENT

     3.1  RENT.  The rental (the "Rent") payable by Tenant during the Term shall
be TWO MILLION TWO HUNDRED THREE THOUSAND SIX HUNDRED SIXTY SEVEN AND 37/100
DOLLARS ($2,203,667.37) per year.  The Rent shall be payable in advance in
monthly installments of ONE HUNDRED EIGHTY-THREE THOUSAND SIX HUNDRED THIRTY-
EIGHT AND 95/100 DOLLARS ($183,638.95) due on or before on the 20th day of each
calendar month during the Term, beginning on the Commencement Date.  Rent shall
be payable at Landlord's address set forth in SECTION 23.1.

     3.2  LATE CHARGE; DEFAULT RATE.  In the event that Tenant shall fail to pay
any installment of Rent or Additional Rent (hereinafter defined) within ten (10)
days after the date on which such installment is due, Tenant shall pay to
Landlord a late charge equal to Five Hundred and no/100 Dollars ($500.00), in
order to compensate Landlord for the extra administrative expenses incurred. 
Rent or Additional Rent that is more than five (5) days past due shall bear
interest at the lesser of the highest lawful rate or the prime rate in effect
from time to time announced by Texas Commerce Bank, National Association,
Houston, Texas, plus five percent (5%) per annum ("Default Rate"), until paid.  

     3.3  ADDITIONAL RENT.  All sums, liabilities, obligations, and other
amounts which Tenant is required to pay or discharge pursuant to this Lease in
addition to the Rent, together with any interest, penalty, or other sum which
may be added for late payment thereof, shall constitute additional rent
hereunder ("Additional Rent").  In the event of any failure on the part of
Tenant to pay or discharge any of the foregoing, Landlord shall have all rights,
powers, and remedies provided for herein or by law or equity or otherwise in the
case of nonpayment of rent.  

                                   ARTICLE IV

                              CONDITION OF PREMISES

     4.1  CONDITION OF THE PREMISES.  THE PREMISES ARE DELIVERED TO TENANT AND
ARE BEING LEASED "AS IS" AND "WITH ALL FAULTS" AND TENANT ACKNOWLEDGES AND
AGREES THAT IT HAS BEEN GIVEN FULL OPPORTUNITY TO INSPECT THE CONDITION OF THE
PREMISES.  TO THE MAXIMUM EXTENT PERMITTED BY LAW, LANDLORD HEREBY DISCLAIMS,
AND TENANT WAIVES THE BENEFIT OF, ANY AND ALL IMPLIED WARRANTIES, INCLUDING
IMPLIED WARRANTIES OF FITNESS OR SUITABILITY FOR PURPOSE, OR THAT THE PREMISES
HAVE BEEN CONSTRUCTED OR MAINTAINED IN A GOOD AND WORKMANLIKE MANNER.  BY
OCCUPYING THE PREMISES AND TAKING POSSESSION THEREOF, TENANT ACCEPTS THE
PREMISES AS SUITABLE FOR THE PURPOSES FOR WHICH THEY ARE LEASED AND ACCEPTS THE
PREMISES AND EACH AND EVERY APPURTENANCE THEREOF, AND WAIVES ANY AND ALL DEFECTS
THEREIN.  NOTWITHSTANDING THE ABOVE, TENANT ACKNOWLEDGES AND AGREES THAT THE
PORTION OF THE PREMISES CONSTITUTING THE NEW 



                                    -3-


<PAGE>

BUILDING IS STILL UNDER CONSTRUCTION AND TENANT WILL BE GIVEN THE OPPORTUNITY 
TO INSPECT AND ACCEPT THE NEW BUILDING, BUT LANDLORD SHALL HAVE NO LIABILITY 
TO TENANT WITH RESPECT TO THE CONDITION OF THE NEW BUILDING OTHER THAN AND TO 
THE EXTENT OF ITEMS COVERED BY THE CONSTRUCTION CONTRACT AND ANY SUBCONTRACTS 
FOR THE CONSTRUCTION OF THE NEW BUILDING.

                                    ARTICLE V

                                       USE

     5.1  PRESCRIBED USE.  Tenant shall use the Premises solely as office,
warehouse and manufacturing facilities.

     5.2  LEGAL USE - VIOLATIONS OF INSURANCE COVERAGE.  Tenant shall not occupy
or use, nor permit any portion of the Premises to be occupied or used, for any
business or purpose that is unlawful or deemed to be disreputable in any manner,
or extra hazardous on account of fire, nor permit anything to be done that will
increase the rate of fire insurance on the Premises, or its contents.

     5.3  UPKEEP OF PREMISES AND ADJACENT AREAS.  Tenant shall take good care of
the Premises and keep them in good repair and free from waste.  Tenant shall
keep the Premises neat, clean and free from dirt, rubbish or other obstructions
at all times.  Tenant shall store all trash and garbage within the appropriate
waste disposal areas and arrange for its regular pick-up or other regular
disposal at Tenant's expense.  

                                   ARTICLE VI

                                    NET LEASE

     6.1  NON-TERMINABILITY.

          A.   This Lease is an absolutely net lease and the Rent, Additional
Rent and all other sums payable hereunder by Tenant shall be paid without notice
(except as expressly provided herein), demand, set-off, counterclaim, abatement,
suspension, deduction or defense.

          B.   This Lease shall not terminate, nor shall Tenant have any right
to terminate this Lease (except as otherwise expressly provided herein), nor
shall Tenant be entitled to any abatement or reduction of Rent hereunder (except
as otherwise expressly provided herein), nor shall the obligations of Tenant
under this Lease be affected, by reason of (i) any damage to or destruction of
all or any part of the Premises from whatever cause, (ii) the taking of the
Premises or any portion thereof by condemnation, requisition or otherwise, (iii)
the prohibition, limitation or restriction of Tenant's use of all or any part of
the Premises, or any interference with such use, (iv) any eviction by superior
title or otherwise, (v) Tenant's acquisition or ownership of all or any part of
the Premises otherwise than as expressly provided herein, (vi) any default on
the part of Landlord under this Lease, 



                                    -4-


<PAGE>

or under any other agreement to which Landlord and Tenant may be parties, 
(vii) the failure of Landlord to deliver possession of the Premises on the 
commencement of the term hereof, or (viii) any other cause whether similar or 
dissimilar to the foregoing, any present or future law to the contrary 
notwithstanding.  It is the intention of the parties hereto that the 
obligations of Tenant hereunder shall be separate and independent covenants 
and agreements, that the Rent, the Additional Rent and all other sums payable 
by Tenant hereunder shall continue to be payable in all events and that the 
obligations of Tenant hereunder shall continue unaffected unless the 
requirement to pay or perform the same shall have been terminated pursuant to 
any express provision of this Lease.

          C.   Except as expressly provided herein, Tenant agrees that it will
remain obligated under this Lease in accordance with its terms, and that it will
not take any action to terminate, rescind, or avoid this Lease, notwithstanding
(1) the bankruptcy, insolvency, reorganization, composition, readjustment,
liquidation, dissolution or winding-up or other like proceeding affecting
Landlord or its successor in interest, or (2) any action with respect to this
Lease which may be taken by any trustee or receiver of Landlord or its successor
in interest or by any court in any such proceeding.

          D.   Tenant waives all rights which may now or hereafter be conferred
by law (i) to quit, terminate or surrender this Lease or the Premises or any
part thereof, or (ii) to any abatement, suspension, deferment or reduction of
the Rent, Additional Rent or any other sums payable under this Lease, except as
otherwise expressly provided herein.

                                   ARTICLE VII

                          TAXES, UTILITIES, MAINTENANCE

     7.1  TAXES.  Tenant shall pay, or at Landlord's option, reimburse Landlord
for the payment by Landlord of, all taxes, assessments, and other governmental
charges, whether federal, state, county or municipal, and whether they be by
taxing districts or authorities presently taxing the Premises or by others,
subsequently created or otherwise, and any other taxes and assessments levied or
assessed against the Premises (together, "Taxes").  If Tenant pays the Taxes
directly, Tenant shall pay all Taxes before the date they become delinquent and
shall provide to Landlord written tax receipts evidencing payment of the Taxes
at least ten (10) days prior to the date such Taxes become delinquent.  If
Landlord elects to pay the Taxes and have Tenant reimburse Landlord for those
Taxes, Tenant shall pay to Landlord on the same day as installments of Rent are
due, as Additional Rent under this Lease, one-twelfth (1/12th) of the amount of
Taxes estimated by Landlord to become due with respect to the Premises for that
year.  On or before January 31 of each year, Landlord shall either (a) submit an
statement to Tenant for the actual amount of Taxes due for the previous year,
LESS amounts already paid by Tenant, and Tenant shall pay such amount within
fifteen (15) days after receipt of such statement thereof, or (b) refund to
Tenant the difference, if any, of the Taxes paid by Tenant and the amount of
actual Taxes for that year.

     7.2  UTILITIES.  Tenant shall be responsible for and promptly pay all
charges incurred for all utility services to the Premises, including, but not
limited to, telephone 



                                    -5-


<PAGE>

service, sanitary sewer, water, natural gas, and electricity arising out of 
Tenant's use, occupancy, and possession of the Premises.  Tenant shall also 
provide all replacement light bulbs and tubes and pay for all maintenance 
upon utilities.  In no event shall Landlord be liable for any interruption or 
failure of utility service to the Premises.  

     7.3  MAINTENANCE, REPAIRS.

          A.   Subject to the provisions of ARTICLE XX below, relating to
destruction of or damage to the Premises, Tenant agrees that, at its own
expense, it will keep and maintain the Premises, including, without limitation,
the roof, exterior, foundation, structural, and operational parts, paving, and
landscaping, in a condition and repair similar to its condition and repair on
the Commencement Date hereof, reasonable wear and tear excepted.  Tenant shall
be responsible for disposal of its trash from the Premises.  Replacement and
repair parts, materials, and equipment shall be of quality equivalent to those
initially installed within the Premises and repair and maintenance work shall be
done in accordance with the then existing federal, state, and local laws,
regulations, and ordinances pertaining thereto.  Upon any termination of this
Lease, Tenant shall surrender the Premises in a condition and repair similar to
its condition and repair on the commencement date hereof, reasonable wear and
tear excepted, and shall surrender all keys for the Premises to Landlord at the
place then fixed for the payment of rent.  

          B.   Tenant covenants that in case of damage to or destruction of any
or all of the improvements upon the Premises by fire or any other cause, insured
or uninsured, Tenant will promptly, at its sole cost and expense, restore,
repair, replace or rebuild the improvements so damaged or destroyed as nearly as
practicable to the condition, quality and class thereof immediately prior to
such damage or destruction, or with such changes or alterations as Tenant shall
elect to make in conformity with ARTICLE XX of this Lease.  In performing its
obligations under this paragraph, Tenant shall be entitled to insurance proceeds
under the terms and conditions set forth in ARTICLE XX hereof.  Landlord shall
have the right to approve the plans and specifications for the work or repair,
replacement or rebuilding, such approval not to be unreasonably withheld or
delayed.  Tenant shall diligently obtain all necessary permits for such work or
repair and shall maintain builder risk insurance in amounts reasonably
satisfactory to Landlord until completion of such work.  Such restoration,
repairs, replacement or rebuilding shall be commenced promptly and prosecuted
with diligence, subject to unavoidable delays and force majeure.

     7.4  TAXES ON TENANT'S PROPERTY.  Tenant shall be liable for all taxes
levied or assessed against personal property, furniture, fixtures or other
improvements placed by Tenant in the Premises.  If any such taxes for which
Tenant is liable are levied or assessed against Landlord or Landlord's property
and if Landlord elects to pay the same or if the assessed value of Landlord's
property is increased by inclusion of personal property, furniture, fixtures, or
other improvements placed by Tenant in the Premises, and Landlord elects to pay
the taxes based on such increase, then Tenant shall pay to Landlord on demand
that part of such taxes for which Tenant is liable under this Lease.

     7.5  GOVERNMENTAL ORDERS; COVENANTS; LANDLORD CURE; PERMITTED CONTEST:



                                    -6-


<PAGE>

          A.   Tenant shall, at its own cost and expense, promptly comply with
all applicable laws and with all applicable requirements of any legally
constituted public authority having jurisdiction over the Premises, with any
covenants or restrictions binding on the Premises and any contract, agreement or
other instrument applicable to the Premises and in effect on the date of
delivery hereof or to which Tenant is a party or has given its consent.

          B.   If Tenant fails to perform Tenant's obligations under any
paragraph of this Lease, Landlord may at its option after twenty (20) days
written notice (unless in Landlord's judgment its interest in the Premises may
be prejudiced by delay in which case notice shall be given to Tenant,
contemporaneously with the commencement of Landlord's performance), and unless
Tenant has bonded the obligations and is proceeding, diligently to perform the
same, perform such obligations on Tenant's behalf and the cost thereof, together
with interest thereon at the Default Rate shall become due and payable as
Additional Rent to Landlord on the next date scheduled for the payment of Rent.

          C.   Provided that Tenant first posts a bond, cash reserve or other
security reasonably acceptable to Landlord in an amount equal to the amount in
controversy, Tenant shall have the right to contest, by appropriate proceedings,
any tax, charge, levy, assessment, lien or other encumbrance, and/or any law,
rule, order, ordinance, regulation or other governmental requirement affecting
the Premises, and to postpone payment of or compliance with the same during the
pendency of such contest provided that in the event of such postponement or
payment or noncompliance: (i) Tenant shall not postpone the payment of any such
tax, charge, levy, assessment, lien or other encumbrance for such length of time
as shall permit the Premises, or any lien thereon created by such item being
contested, to be sold by federal, state, country or municipal authority for the
non-payment thereof; (ii) Tenant shall not postpone compliance with any such
law, rule, order, ordinance, regulation or other governmental requirements if
Landlord will thereby be subject to civil liability or criminal prosecution, or
if any municipal or other governmental authority shall commence a process
according to applicable law to carry out any work to comply with the same or to
foreclose or sell any lien affecting all or part of the Premises which shall
have arisen by reason of such postponement or failure of compliance; and (iii)
Tenant shall pay, in a timely fashion, all Rent and Additional Rent (other than
any item of Additional Rent that Tenant is permitted to contest pursuant to this
Lease, so long as Tenant satisfies all of the requirements of this Lease
relating to such contest) which shall become due and payable under this Lease. 

                                  ARTICLE VIII

                                 INDEMNIFICATION

     8.1  RELEASE OF CLAIMS.  Tenant waives all claims against Landlord and its
agents and employees for injury to persons, damage to property or to any other
interest of Tenant sustained by Tenant or any person claiming through Tenant
resulting from any occurrence in or upon the Premises including, but not limited
to, such claims for damages resulting from: (a) any equipment or appurtenances
becoming out of repair; (b) the Premises being out of repair; (c) injury or
damage done or occasioned by wind, water, flooding, 



                                    -7-


<PAGE>

freezing, fire, explosion, earthquake, excessive heat or cold, vandalism, 
riot or disorder or other casualty; (d) any defect in or failure of plumbing, 
heating or air conditioning equipment, electric wiring or installation 
thereof, gas, water, steam pipes, stairs, railings or walls; (e) broken 
glass; (f) the backing up of any sewer pipe or downspout; (g) the bursting, 
leaking or running of any tank, tub, washstand, water closet, water pipe, 
drain, cooling coil or any other pipe or tank in, upon or about the Premises; 
(h) the escape of steam or hot water; (i) water, snow or ice being upon or 
coming through the roof, skylight, trapdoor, stairs, walks or any other place 
upon or near the Premises or otherwise; (j) the falling of any fixture, 
plaster or stucco; and (k) any act, omission, or negligence of occupants of 
adjoining or contiguous buildings or of owners of adjacent or contiguous 
property.  Except as waived pursuant to SECTION 9.1 of this Lease, Tenant has 
not and does not waive any claims, actions, losses, damages, or expenses 
suffered by Tenant which are caused by the willful misconduct of Landlord, 
its agents, employees, contractors, or invitees; provided, however, that the 
provisions of SECTION 9.1 of this Lease shall, to the extent contrary to the 
provisions of this sentence, control and supersede.  

     8.2  INDEMNIFICATION OF LANDLORD.  Tenant hereby agrees to indemnify and
save Landlord harmless from and against any and all claims, actions, damages,
liabilities, and expenses in connection with the loss of life, personal injury,
and/or damage to property arising from or out of (a) any occurrence in, upon, or
at the Premises, however caused, including occurrences caused by the sole or
contributory negligence of Tenant, its agents, customers, invitees,
concessionaires, contractors, servants, vendors, materialmen, or suppliers;
(b) the occupancy, use, or misuse by Tenant, or Tenant's employees, of the
Premises, service areas, parking areas, pedestrian areas, pedestrian walks, or
driveways; (c) any occurrence on the Premises occasioned wholly or in part by
any act or omission of Tenant, its agents, customers, invitees, concessionaires,
contractors, servants, vendors, materialmen, or suppliers; or (d) any occurrence
occasioned by the violation of any law, regulation or ordinance by Tenant or its
agents, customers, invitees, concessionaires, contractors, servants, vendors,
materialmen, or suppliers; provided, however, that the provisions of this
indemnity shall not be applicable when such claims, actions, losses, damages, or
expenses are determined to have been caused by the willful misconduct of
Landlord, its agents, employees, contractors, or invitees.  If Landlord is made
a party to any litigation commenced by or against Tenant for any of the above
reasons for which Tenant is obligated to indemnify Landlord, then Tenant shall
protect and hold Landlord harmless and pay all costs, penalties, charges,
damages, expenses, and reasonable attorneys' fees incurred or paid by Landlord. 
The foregoing indemnity shall be in addition to Tenant's obligation to supply
the insurance as required by ARTICLE IX of this Lease and not in discharge of or
substitution for same.  

                                   ARTICLE IX

                                    INSURANCE

     9.1  WAIVER OF SUBROGATION.  Tenant hereby waives and releases any and all
rights, claims, demands, and causes of action it may have against Landlord on
account of any loss or damage occasioned to Tenant, its properties, real and
personal, the Premises, or their contents, arising from any risk or peril
generally covered or coverable by standard 



                                    -8-


<PAGE>

fire and extended coverage insurance or covered or coverable by any insurance 
policy carried by or available to Tenant; and Tenant, on behalf of the 
insurance companies insuring the property of Tenant against any such loss, 
waives and releases any rights of subrogation that such companies insuring 
the property of Tenant against any such loss, may have against Landlord.  

     9.2  PUBLIC LIABILITY AND PROPERTY DAMAGE.

          A.   Tenant, at it's own cost and expense, shall maintain during the
Term general liability insurance relative to the Premises with limits as may be
required by a mortgagee of the Premises and until specifically required in a
lesser amount, in an amount of at least Twelve Million Five Hundred Fifty
Thousand and no/100 Dollars ($12,550,000.00) per occurrence, or such other
amount as may be required of Landlord under the Mortgage.  Landlord and any
assignee or mortgagee of Landlord identified in writing to the insurer shall be
named as additional insureds and such policy shall provide that the same may not
be invalidated against Landlord or any assignee or mortgagee of Landlord,
including Mortgagee, by reason of any violation of a condition or a breach of
warranty of the policy or in the application thereof by Tenant, that the policy
may be canceled or materially altered or reduced in coverage by the insurer only
after thirty (30) days prior written notice to Landlord and any assignee or
mortgagee of Landlord, including Mortgagee, identified in writing to the
insurer, and that the insurer will give written notice to Landlord or any
assignee or mortgagee of Landlord identified in writing to the insurer in the
event of non-payment of any premium by Tenant when due.  Said insurance may be
part of a bulk or general blanket insurance policy carried by Tenant and Tenant
shall not be required to obtain a separate policy relative to the Premises. 
Tenant shall provide Landlord with a certificate of such insurance on an annual
basis.

          B.   Tenant, at its own cost and expense, shall maintain during the
Term an all risk hazard insurance policy with limits as may be required by a
mortgagee of the Premises, subject to standard exclusions but with vandalism and
malicious mischief endorsements, on all improvements to the Premises, including,
without limitation, the Buildings, improvements, alterations and additions which
are, or may become, a part thereof.  Said insurance may be part of a bulk or
general blanket insurance policy covered by Tenant and Tenant shall not be
required to obtain a separate policy for such insurance.  Landlord and any
assignee or mortgagee of Landlord, including Mortgagee, identified in writing to
the insurer shall be named as an additional insured.  The payment of loss
relative to the Premises shall be payable as provided for in Paragraph 20.1. 
Such policy shall provide that the policy may not be invalidated against
Landlord or any assignee or mortgagee of Landlord, including Mortgagee,
identified to the insurer by reason of any violation of a condition or a breach
of warranty of the policy or in the application therefore by Tenant, the use of
the Premises for more hazardous purposes or change of ownership of the Premises
and that the policy may be canceled or materially altered or reduced in coverage
by the insurer only after thirty (30) days prior written notice to Landlord and
any assignee or mortgagee of Landlord, including Mortgagee, identified in
writing to the insurer, and that the insurer will give written notice to
Landlord or assignee or mortgagee of Landlord, including Mortgagee, identified
in writing to the insurer in the event of the non-payment of any premium by
Tenant when due.  Said insurance shall be in the amount of 



                                    -9-


<PAGE>

the full replacement cost of the improvements on the Premises as determined by
the insurance company in accordance with its normal and customary internal 
procedures.  Landlord shall be provided with a certificate of such insurance 
on an annual basis.

All such bodily injury liability insurance and property damage liability
insurance shall specifically make reference to the indemnity agreement contained
in ARTICLE VIII hereof and shall name Landlord as additional insured.  

     9.3  WORKER'S COMPENSATION COVERAGE.  Worker's compensation coverage
insurance shall be procured by Tenant in whatever amounts are necessary to
comply with the requirements of the State of Texas or, to the extent permitted
by state law, Tenant shall self-insure for Tenant's employees.  

     9.4  POLICY FORM.  Insurance required hereunder shall be in companies
reasonably satisfactory to Landlord licensed to operate in the State of Texas
holding a rating as may be required by any lender having a lien on the Premises
as set forth in the most current issue of "Best's Insurance Guide" but in any
event a rating of at least A:X, it being understood that if the insurer has a
rating of A:X or better, a lender may not require an insurance company with a
higher rating and in any case where a change of insurers is required as a result
of decline in an insurer's Best's rating, such change need not be effected until
the end of the current policy year. Tenant shall deliver to Landlord
certificates evidencing the existence and amounts of such insurance with loss
payable clauses as required by this Paragraph.  No such policy shall be
cancelable or subject to reduction of coverage or other modification except
after thirty (30) days prior written notice to Landlord of the expiration of
such policies.  Tenant shall furnish Landlord with renewals or "binders"
thereof.  Tenant may effect the insurance coverage required by this Lease
through primary and excess lines of insurance.  Tenant may have a maximum
deductible not in excess of Twenty Thousand and no/100 Dollars ($20,000.00),
adjusted annually for increases in the Consumer Price Index.  For each Lease
Year, Tenant's Maximum Deductible shall be determined by multiplying Tenant's
current maximum deductible (inclusive of previous annual increases) by a
fraction, the numerator of which is the Consumer Price Index for the month
immediately preceding the first day of the Lease Year for which the Maximum
Deductible is to be determined and the denominator of which is the Consumer
Price Index for the month immediately preceding the Commencement Date.  The
requirements of SECTION 9.2 shall not preclude Tenant from carrying additional
bodily injury liability insurance and/or property damage liability insurance in
its name and at its cost.
 
     9.5  TENANT'S FAILURE TO MAINTAIN INSURANCE.  If Tenant fails to comply
with the foregoing insurance requirements, then Landlord may obtain such
insurance and Tenant shall pay to Landlord on demand the premium cost thereof
plus interest at the Default Rate, from the date of payment by Landlord until
payment by Tenant.



                                   -10-

<PAGE>

                                    ARTICLE X

                            ALTERATIONS AND FIXTURES

     10.1 ALTERATIONS AND ADDITIONS.

          A.   At any time during the Term of this Lease, Tenant shall have the
right to make additions and alterations in and to the Premises, provided such
additions and alterations do not (1) materially change the general character of
the Buildings located on the Premises, (2) materially reduce the value of the
Premises, (3) cause the Premises to violate any terms of this Lease, or (4) have
a cost that is estimated to exceed Two Hundred and Fifty Thousand and no/100
Dollars ($250,000.00) in the aggregate, in any calendar year.  Tenant agrees to
provide written notice of such proposed additions or alterations to Landlord and
Mortgagee for them to review, together with copies of plans for such alterations
or additions, but Landlord and Mortgagee shall not have the right to approve or
disapprove such proposal unless it falls within one of the exceptions set forth
above.

          B.   Prior to making any structural additions or alterations to the
Premises, where the cost of such additions or alterations is estimated to exceed
Two Hundred Fifty Thousand Dollars and No/100 Dollars ($250,000.00) in the
aggregate, in any calendar year. Tenant shall submit to Landlord and Mortgagee a
plan showing the nature and extent of such additions and alterations.  Landlord
shall have a period of thirty (30) days, time being of the essence, to review
and provide Tenant with written notice that Landlord and Mortgagee:

               1.   approves the proposed structural alteration or addition;

               2.   approves, with modifications, the proposed
          structural alterations or additions; in this event, Landlord
          shall set out its proposed modifications in detail; or

               3.   disapproves the proposed structural alterations
          stating the basis for such disapproval, provided that
          Landlord's approval shall not be unreasonably withheld.  In
          the event that Landlord does not respond to Tenant within
          thirty (30) days of the submission of the proposed
          structural alterations or additions to Landlord, such
          alterations or additions shall be deemed approved by
          Landlord.

If Landlord and Mortgagee approve, or approve with modifications, such matters
Tenant shall have the right to have such work performed as approved.  If
Landlord and Mortgagee disapprove the proposed structural alterations or
additions, Tenant shall not perform the work, but may resubmit plans designed to
meet the objections raised by Landlord and Mortgagee.  Landlord's and
Mortgagee's approval may not be unreasonably withheld, provided however, the
failure of Mortgagee to approve any additions or alterations will be deemed to
be a reasonable basis for Landlord's disapproval. Prior to commencing work,
Tenant shall obtain, at its expense, all necessary permits and builder's risk
insurance in an amount equal to construction costs.  Upon completion of any
structural additions or 

                                     -11-

<PAGE>

alterations, Tenant shall deliver to Landlord updated plans and 
specifications reflecting such structural additions or alterations and a 
final certificate of occupancy issued subsequent to the completion of the 
additions or alterations.  Landlord shall have title to and ownership of all 
structural alterations and additions, and all structural alterations and 
additions shall be subject to the provisions of this Lease.  All such 
alterations or additions shall be at Tenant's expense.  All such structural 
alterations or additions referred to in this Paragraph shall be expeditiously 
completed in a good and workmanlike manner and in compliance with all 
applicable laws, rules, regulations, ordinances and restrictions then in 
effect.

     10.2 TRADE FIXTURES.  Notwithstanding any provision in this ARTICLE X to
the contrary, all normal trade fixtures, equipment, shelves, racks, machinery,
office equipment, furniture and other personal property installed or placed in
the Premises by Tenant or any of Tenant's subsidiaries, other than replacements
for fixtures, equipment, shelves, machinery, and furniture constituting fixtures
that are in the Premises on the Commencement Date ("Tenant's Trade Fixtures")
may be removed by Tenant on or before the termination date of this Lease;
provided (a) the removal shall be done in a workmanlike manner so as not to
damage the structural integrity of the Building; and (b) Tenant, at Tenant's
sole expense, shall repair all damage to the Premises resulting from the removal
of Tenant's Trade Fixtures.  

                                   ARTICLE XI

                       MECHANICS' AND MATERIALMEN'S LIENS

     11.1 Tenant shall not create or permit to be created or to remain, and will
discharge by payment or bond, any lien (including, but not limited to, the liens
of mechanics, laborers, artisans, or materialmen for work or materials alleged
to be done or furnished in connection with the Premises), encumbrance, or other
charge upon the Premises or any part thereof, upon Landlord's interest therein,
or upon Tenant's leasehold interest; provided, that Tenant shall not be required
to discharge any such liens, encumbrances, or charges as may be placed upon the
Premises by the act of Landlord.  

                                   ARTICLE XII

                                      SIGNS

     12.1 Landlord shall have the right to approve or disapprove the number and
location of, and changes in, any and all exterior signs which are installed,
erected, attached, and/or maintained on the exterior of the Premises.  

                                  ARTICLE XIII

                                   SUBLETTING

     13.1  SUBLETTING.  Tenant shall have the right at all times and from time
to time during the Term to sublease all or any portion of the Premises without
Landlord's consent, 

                                     -12-

<PAGE>

subject, however, to the same limitations for subleasing by Landlord set 
forth in Section 5.6 of the First Mortgage.  Tenant shall not have the right, 
however, to enter into any sublease agreement concerning the use or occupancy 
of the Premises that would extend beyond the Term of this Lease without 
Landlord's prior written consent.  Tenant shall remain liable for all 
obligations under this Lease notwithstanding any sublease hereunder by Tenant 
that does not extend beyond the term of this Lease.

     13.2  TRANSFER OF LANDLORD'S INTEREST.  In the event of the transfer by
Landlord of its interest in this Lease or the Premises, Landlord shall be
released from any further obligations under this Lease, and Tenant agrees to
look solely to Landlord's successor in interest for performance of the
obligations of "Landlord" under this Lease.

                                   ARTICLE XIV

                                 QUIET ENJOYMENT

     14.1 Tenant, upon its payment of all rents and sums herein provided and
upon its compliance with the performance of all those provisions, terms, and
conditions applicable to and performable by Tenant, shall peaceably and quietly
hold occupy, and enjoy the Premises for the Term without hindrance, ejection, or
interruption by Landlord, or persons lawfully or equitably claiming under or
through Landlord; provided that this covenant shall be binding upon Landlord and
its successors and assigns only with respect to breaches occurring during its or
their respective ownership of Landlord's interest hereunder.  

                                   ARTICLE XV

                                 RIGHT OF ACCESS

     15.1 Landlord shall have the right, but not the obligation, to enter the
Premises upon twenty-four (24) hours advance notice to Tenant and during
reasonable business hours (except in an emergency) to examine the same and, if
Tenant has not made such repairs within thirty (30) days after written notice
thereof (or a shorter period if there is a danger to life or property), to make
such repairs, alterations, improvements, or additions as Tenant has failed to
make in accordance with the terms of this Lease, and Landlord shall be allowed
to take all materials into and upon the Premises that may be required therefor
without the same constituting an eviction of Tenant, actual or constructive, and
the Rent shall in no way abate while such repairs, alterations, improvements, or
additions are being made, by reason of loss or interruption of business of
Tenant; provided, however, that Landlord shall not unreasonably interfere with
the normal business operations of Tenant. 

                                   ARTICLE XVI

                                  HOLDING OVER

     16.1 Should Tenant remain in possession of the Premises, or any part
thereof, after termination of this Lease (whether by the expiration of the Term
or otherwise) without the execution of a new lease by Landlord and Tenant,
Tenant, at the option of Landlord, shall 

                                     -13-

<PAGE>

become a tenant from month-to-month of the Premises, or any part thereof, at 
one hundred and ten percent (110%) of the monthly Rent pro rated and 
effective in the last month of the Term, and under all other terms, 
conditions, provisions, and obligations of this Lease insofar as the same are 
applicable to a tenancy from month-to-month.  

                                  ARTICLE XVII

                     EVENTS OF DEFAULT, LANDLORD'S REMEDIES

     17.1  EVENTS OF DEFAULT.  The occurrence of any of the following events
shall constitute an Event of Default (herein so called) by Tenant under this
Lease:

          A.   Failure of Tenant to pay when due an installment of Rent,
Additional Rent or any other amount payable to Landlord hereunder following the
expiration of five (5) days after notice from Landlord.

          B.   Failure of Tenant to comply with any term, condition or covenant
of this Lease following the expiration of thirty (30) days after notice from
Landlord, provided, however, if the failure to comply cannot reasonably be cured
within such thirty (30) day period, and Tenant commences efforts to cure within
the thirty (30) day period, Tenant shall have a reasonable time to cure such
default.

          C.   Insolvency of, or the making of a transfer in fraud of creditors
or a general assignment for the benefit of creditors by Tenant.

          D.   The occurrence of a Bankruptcy Event.   

          E.   Assignment of Tenant's interest in this Lease by operation of
law.

     17.2  LANDLORD'S REMEDIES.  Upon the occurrence of any Event of Default,
and the expiration of any applicable grace period, Landlord may, in addition to,
and not in derogation of any remedies for any preceding breach or covenant, with
or without notice of demand (except as otherwise expressly provided in this
Lease) and without limiting Landlord in the exercise of any right or remedy
which Landlord may have by reason of such default or breach:

          A.   Immediately or any time thereafter while such Event of Default
continues, mail a notice of termination addressed to Tenant and proceed pursuant
to and with due process of law, to repossess the same as Landlord's former
estate without prejudice to any remedies which might otherwise be used for
arrears of rent or prior to breach of covenant, and upon such notice as
aforesaid this Lease shall terminate, but Tenant shall remain liable for its
default hereunder as hereinafter provided.  Tenant shall have the right to cure
any default until the expiration of the applicable grace period, if any,
following notice by Landlord, as specified above.  Where Landlord has given
notice as provided for above, no further notice shall be required to effectuate
a termination of this Lease, which termination shall occur automatically unless
the default is cured within the time periods provided in this Lease.

                                     -14-

<PAGE>

          B.   Terminate Tenant's right to possession of the Premises by court
order or any lawful means, in which case Tenant's right to possession under this
Lease shall terminate, and Tenant shall immediately surrender possession of the
Premises to Landlord.  In such event, Landlord shall be entitled to recover from
Tenant all damages incurred by Landlord by reason of Tenant's default,
including, but not limited to, the cost of recovering possession of the
Premises; reasonable expense of reletting, including necessary renovation and
alteration of the Premises; reasonable attorney's fees and any reasonable real
estate commissions actually paid; the worth at the time of award by the court
having jurisdiction thereof of the amount by which the unpaid rent for the
balance of the term after the time of such award exceeds the amount of such
rental loss for the same period that Tenant proves could be reasonably avoided;
and that portion of any reasonable leasing commissions paid by Landlord
applicable to the unexpired Term of this Lease.

          C.   Landlord can continue this lease in full force and effect, and
this Lease will continue in effect as long as Landlord does not terminate
Tenant's right to possession, and Landlord shall have the right to collect Rent
when due.  After the occurrence of an Event of Default, Landlord can enter the
Premises and relet them, or any part of them, to third parties for Tenant's
account.  Tenant shall be liable immediately to Landlord for all reasonable
costs Landlord incurs in reletting the Premises.  Reletting can be for a period
shorter or longer than the remaining Term of this Lease.  Tenant shall pay to
Landlord the Rent on the dates the Rent is due, less the rent Landlord receives
from any reletting.  No act by Landlord allowed by this Paragraph shall
terminate this Lease unless Landlord notifies Tenant that Landlord elects to
terminate this Lease.  After Tenant's default and for as long as Landlord does
not terminate Tenant's right to possession of the Premises, if Tenant obtains
Landlord's consent, Tenant shall have the right, subject to the limitations set
forth in SECTION 5.6 of the First Mortgage, to assign or sublet its interest in
this Lease, but Tenant shall not be released from liability.  Landlord's consent
to such a proposed assignment or subletting shall not be unreasonably withheld.

          If Landlord elects to relet the Premises as provided in this
paragraph, rent that Landlord receives from reletting shall be applied to the
payment of:

          FIRST, any indebtedness from Tenant to Landlord other than Rent
     due from Tenant;

          SECOND, all reasonable costs incurred by Landlord in reletting;

          THIRD, Rent due and unpaid under this Lease.  After deducting the
     payments referred to in this subparagraph, any sum remaining from the
     rent Landlord receives from reletting shall be held by Landlord and
     applied in payment of future Rent as Rent becomes due under this
     Lease.  If, on the date Rent is due under this Lease, the rent
     received from the reletting is less than the Rent due on that date,
     Tenant shall pay to Landlord, in addition to the remaining Rent due,
     all reasonable costs Landlord incurred in reletting that remain after
     applying the rent received from the reletting as provided in this
     subparagraph.

                                     -15-

<PAGE>

          D.   Pursue any other remedy now or hereafter available to Landlord
under the laws or judicial decisions of the State of Texas.

          E.   Pursuit of any of the foregoing remedies does not constitute an
irrevocable election of remedies nor preclude pursuit of any other remedy
provided elsewhere in this Lease or by applicable law, and none is exclusive of
another unless so provided in this Lease or by applicable law.  Likewise,
forbearance by Landlord to enforce one or more of the remedies available to it
on an Event of Default does not constitute a waiver of that default or of the
right to exercise that remedy later or of any rent, damages or other amounts due
to Landlord hereunder. 

          17.3 ATTORNEYS' FEES.  In the event that Tenant defaults in the
performance of any of the terms, covenants, agreements, or conditions contained
in this Lease and Landlord places the enforcement of this Lease, or any part
thereof, or the collection of any rent or charge due, or to become due, or the
recovery of the possession of the Premises, in the hands of attorneys, or files
suit upon the same, Tenant agrees to pay Landlord's reasonable attorneys' fees.

                                  ARTICLE XVIII

                            WAIVER OF LANDLORD'S LIEN

     18.1  Landlord hereby waives all of Landlord's rights to any contractual,
statutory, constitutional or other lien or security interest on any of Tenant's
property or the property of any assignee or subtenant that may now or at any
time hereafter be situated on the Premises.

                                   ARTICLE XIX

                    SUBORDINATION AND ATTORNMENT, TERMINATION

     19.1 SUBORDINATION.  Landlord shall have the right to transfer, assign,
mortgage and convey in whole or in part the Premises or the Site and any and all
of its rights under this Lease, and nothing herein shall be construed as a
restriction upon Landlord's doing so.  Tenant hereby subordinates this Lease and
all rights of Tenant hereunder to any mortgage or deed of trust, and all
renewals, substitutions and extensions thereof, that is now or may hereafter be
placed on the Premises covered by this Lease.  Tenant agrees to execute any
certificate or instrument, including without limitation the Tenant estoppel
letter described in SECTION 19.3 below, that may be deemed, in Landlord's sole
discretion, necessary to further effect the subordination of this Lease to such
mortgage or to confirm any election to continue the Lease in effect in the event
of foreclosure, as provided above.  Tenant hereby constitutes and appoints
Landlord as Tenant's attorney-in-fact to execute any such certificate or
instrument, including the Tenant estoppel letter described in SECTION 19.3
below, for and on behalf of Tenant. 

     19.2  ATTORNMENT ON FORECLOSURE.   Landlord and Tenant agree that, if any
person or entity acquires the Premises as a purchaser at any foreclosure sale or
by deed in 

                                     -16-

<PAGE>

lieu of foreclosure (any such mortgagee or other lienholder or purchaser by 
deed in lieu of foreclosure or at a foreclosure sale being each hereinafter 
referred to as the "Purchaser at Foreclosure"), Tenant, at Tenant's sole 
discretion, shall, on the written request of the Purchaser at Foreclosure, 
attorn to the Purchaser at Foreclosure and thereafter remain bound as if a 
new and identical Lease between the Purchaser at Foreclosure, as landlord, 
and Tenant, as tenant, had been entered into as of the date of foreclosure 
for the remainder of the Term, except that the Purchaser at Foreclosure shall 
not be liable for any act or omission of any prior landlord, subject to any 
offsets, claims, or defenses that Tenant might have against any prior 
landlord, or bound by any rent that Tenant might have paid more than one (1) 
month in advance or any amendment to this Lease made without its prior 
written consent.

     19.3 ESTOPPEL LETTERS.  Within ten (10) days after Landlord's request, from
time to time, Tenant shall execute and deliver to Landlord or to a mortgagee or
prospective purchaser, as directed by Landlord, a statement in writing, in the
form attached hereto as EXHIBIT C.
     
     19.4 TERMINATION.   Notwithstanding any provision hereof or any provision
of that certain Subordination, Attornment and Non-Disturbance Agreement
("SANDA") dated the same date as this Lease executed by Landlord and Tenant to
the contrary, upon satisfaction of the following conditions and (i) if a
Termination Event occurs under SECTION 19.4A below, the Lease will automatically
terminate in accordance with such provision, or (ii) if a Termination Event
occurs under SECTION 19.4B below, Tenant shall have the right to terminate this
Lease in accordance with such provision, and in either event, Tenant shall have
no further liability or obligation to Landlord, other than the payment of Rent,
Additional Rent and other  amounts due under this Lease through and including
the date of termination.

          A.   If a Termination Event occurs and the purchaser of the Mortgaged
Property (as defined in the First Mortgage) at such foreclosure sale is a person
or entity other than Mortgagee or any of Mortgagee's affiliates, then this Lease
shall terminate effective upon the date which is fifteen (15) days after the
foreclosure sale.  Upon such a Termination Event, Tenant shall be
unconditionally obligated to pay to Mortgagee a Termination Fee in the amount of
the difference (if positive) between (1) the amount of the Pre-Foreclosure Debt
on the date of the foreclosure sale, and (2) the amount of the successful final
bid at such foreclosure sale for the purchase of the Mortgaged Property.  The
Termination Fee shall be due and payable by Tenant to Mortgagee on or before the
date that is ninety (90) days after the date of the foreclosure sale, and if
Tenant fails or refuses to pay the Termination Fee, Mortgagee shall have all
rights and remedies available to it to collect such debt under all applicable
laws.  Notwithstanding any default under the Lease on the date of the
foreclosure sale, Tenant shall have the right to continue to occupy the Premises
for a period of up to fifteen (15) days after the foreclosure sale for the sole
purpose of removing any of its property that is not part of the Mortgaged
Property from the Premises in accordance with the terms of this Lease regarding
removal of Tenant's property at the termination or expiration of this Lease, and
this provision shall be binding on any purchaser at any foreclosure sale.

                                     -17-

<PAGE>

          B.   If a Termination Event occurs and the purchaser of the Mortgaged
Property at such foreclosure sale is Mortgagee or any of Mortgagee's affiliates,
then Tenant shall have the option, exercisable by delivering written notice to
Mortgagee on or before the date that is thirty (30) days after the date of the
foreclosure sale, to either (i) agree that Tenant shall continue to be bound by
the terms of this Lease for the remainder of the Term and that Tenant shall have
no further right to terminate this Lease, or (ii) terminate this Lease effective
upon the date that is one hundred (100) days after the date of the foreclosure
sale.  If Tenant chooses to terminate the Lease pursuant to (ii) above, Tenant
shall be unconditionally obligated to pay to Mortgagee a Termination Fee in the
amount of the greater of (a) ONE MILLION EIGHT HUNDRED TWENTY-FIVE THOUSAND AND
NO/100 DOLLARS ($1,825,000.00) or (b) the difference (if positive) between (1)
the amount of the Pre-Foreclosure Debt on the date of the foreclosure sale, and
(2) the Fair Market Value (as defined in C. below) of the Mortgaged Property. 
The Termination Fee shall be due and payable by Tenant to Mortgagee on or before
the later of (x) the date that is sixty (60) days after the date of the
termination of the Lease or (y) ten (10) days following the determination of the
Fair Market Value of the Mortgaged Property in accordance with SECTION 19.4C
below, and if Tenant fails or refuses to pay the Termination Fee, Mortgagee
shall have all rights and remedies available to it to collect such debt under
all applicable laws.  Notwithstanding the termination of the Lease as set forth
above, Tenant shall have the right to continue to occupy the Premises for a
period of up to fifteen (15) days after the termination of the Lease for the
sole purpose of removing any of its property that is not part of the Mortgaged
Property from the Premises in accordance with the terms of this Lease regarding
removal of Tenant's property at the termination or expiration of this Lease.

          C.   For purposes of this SECTION 19.4, the term "FAIR MARKET VALUE OF
THE MORTGAGED PROPERTY" shall be calculated in accordance with this SECTION
19.4C.  Following a termination of the Lease in accordance with SECTION 19.4B,
Mortgagee and Tenant shall use reasonable efforts to agree upon value for the
Fair Market Value of the Mortgaged Property, and if the parties cannot agree
upon the Fair Market Value of the Mortgaged Property within ten (10) days after
the termination of the Lease, then each of Mortgagee and Tenant, within ten (10)
days thereafter, shall choose and engage (it being agreed that Tenant shall
reimburse Mortgagee or pay for the cost and expense of all appraisals) an
independent MAI-certified real estate appraiser experienced in determining the
fair market value of office, manufacturing and warehouse properties which are
similar to the Mortgaged Property in the general area of the Mortgaged Property
in order to determine the Fair Market Value of the Mortgaged Property
("QUALIFIED APPRAISER") in accordance with the assumptions and parameters set
forth in this Paragraph C. If either party fails to select a Qualified Appraiser
within such 10-day period, then the other party shall choose a second Qualified
Appraiser.  Each Qualified Appraiser shall be required to use their best efforts
to complete their initial appraisal report and submit it to the party requesting
same within twenty (20) days after the date of their engagement for such party's
review and comment, and Mortgagee and Tenant shall each deliver to the other the
final appraisal report determining the Fair Market Value of the Mortgaged
Property (each a "FIRST ROUND APPRAISAL") within thirty (30) days after the
engagement of the Qualified Appraisers.

               1.   If the difference in the values determined in each First
     Round Appraisal is less than or equal to ten percent (10%) of the value
     determined by the 

                                     -18-

<PAGE>

     lower of the two First Round Appraisals, then the Fair Market Value of 
     the Mortgaged Property shall be the average between the values determined 
     in each First Round Appraisal.

               2.   If the difference in the values determined in each First
     Round Appraisal is more than ten percent (10%) of the value determined by
     the lower of the two First Round Appraisals, then the two Qualified
     Appraisers selected by Mortgagee and Tenant shall choose a third Qualified
     Appraiser (the cost of which shall be borne by Tenant) to determine the
     Fair Market Value of the Mortgaged Property, who shall use his best efforts
     to complete his appraisal report (the "THIRD  APPRAISAL" and submit it to
     Mortgagee and Tenant within twenty (20) days after the date of his
     engagement.  Mortgagee and Tenant agree that the Fair Market Value of the
     Mortgaged Property shall be the average between the values determined in
     (a) the Third Appraisal and (b) the First Round Appraisal which determined
     a value that was closer to the value determined by the Third Appraisal than
     the value determined by the other First Round Appraisal.

Mortgagee and Tenant agree that, for purposes of this SECTION 19.4 and of
determining the Fair Market Value of the Mortgaged Property, all Qualified
Appraisers selected by the parties may not consider and should disregard the
Master Lease as a component to the Fair Market Value of the Mortgaged Property,
and that the Fair Market Value of the Mortgaged Property  should reflect the
fair market value of only the fee interest in the Mortgaged Property and any and
all easement, privileges and appurtenances thereto, assuming the Mortgaged
Property is vacant. 

          D.   Any Termination Fee payable by Tenant to Mortgagee under this
SECTION 19.4 shall be in the form of cash or immediately available funds or by
the execution and delivery of a promissory note with a maturity date of no later
than 180 days thereafter. 

                                   ARTICLE XX

                            CASUALTY AND CONDEMNATION

     20.1  FIRE AND CASUALTY DAMAGE.

          A.   In the event of a casualty, Tenant shall (i) have no right to
terminate this Lease and (ii) be required to restore the improvements and will
be entitled to the insurance proceeds to the extent required to restore the
Premises.  In the event the net proceeds on any claim are not in excess of One
Hundred Thousand and No/100 Dollars ($100,000.00), such proceeds shall be
payable to Tenant.  In the event the net proceeds are in excess of One Hundred
Thousand and No/100 Dollars ($100,000.00), such sum shall be paid to and
deposited with either a bank or trust company having an office in the State of
Texas and designated by Tenant, subject to the reasonable approval of Landlord. 
Such bank or trust company (the "Proceeds Trustee") shall hold such funds in the
name of the Proceeds Trustee as trustee for Landlord and Tenant and the funds
shall be disbursed in the manner hereinafter provided.  Notwithstanding the
above, Mortgagee may, at its option, be appointed Proceeds Trustee for so long
as the First Mortgage remains outstanding.  The 

                                     -19-

<PAGE>

Proceeds Trustee shall deposit insurance proceeds in an interest bearing 
account (if available), and interest shall be distributed to Tenant upon 
completion of said installation, repair, replacement or rebuilding, provided 
no default has occurred and is continuing hereunder.  All checks drawn on 
said account shall be co-signed by the Proceeds Trustee and Tenant.  
Insurance proceeds shall be disbursed to Tenant by the Proceeds Trustee upon 
receipt by Landlord and Proceeds Trustee of the following:

          1.   A certificate signed by a licensed architect or engineer
     selected by Tenant, subject to the approval of Landlord (such approval
     not to be unreasonably withheld or delayed) and also signed by Tenant,
     dated not more than thirty (30) days prior to the application for such
     disbursement, setting forth in substance the following:

               a.   that the sum then requested to be disbursed either
          has been paid by Tenant or is justly due to contractors,
          subcontractors, materialmen, engineers, architects or other
          persons (whose names and addresses shall be stated) who have
          rendered and furnished certain labor and materials for the
          work; giving a brief description of such services and
          materials and the principal subdivisions or categories
          thereof and the amounts so paid or due to said persons in
          respect thereof, and stating the progress of the work up to
          the date of said certificate;

               b.   that the sum then requested to be disbursed, plus
          all sums previously disbursed, does not exceed the cost of
          the work as actually accomplished up to the date of such
          certificate (less than ten percent (10%) of such cost which
          shall be retained by the Proceeds Trustee to be disbursed
          following completion of the work to be done by the named
          contractor);

               c.   that except for the amounts, if any, stated in
          said certificate pursuant to the foregoing clause a. of this
          Paragraph to be due for services or materials, there is no
          outstanding indebtedness known to the person signing the
          certificate, after due inquiry, which is then due and
          payable for work, labor, services and materials in
          connection with the work, which, if unpaid, might become the
          basis of a vendor's, mechanic's, laborer's, or materialman's
          statutory or similar lien upon Tenant's leasehold estate or
          Tenant's or Landlord's interest in the Premises or any part
          thereof; and

               d.   that the amount remaining in the possession of the
          Proceeds Trustee after disbursement of the sum then
          requested at least equals the estimate unpaid costs to
          complete the work (and if insufficient funds remain, Tenant
          shall deposit additional funds with the Proceeds Trustee
          sufficient to enable the architect or engineer to make the
          foregoing certification).

                                     -20-


<PAGE>

          2.   A certificate signed by Tenant, dated not more than thirty
     (30) days prior to the application for such disbursement, setting
     forth in substance that, to the best knowledge of Tenant, after due
     inquiry:

               a.   all materials and all property described in the
          certificate are free and clear of all liens and
          encumbrances, except such as may secure indebtedness due to
          persons (whose names and addresses and the several amounts
          due them shall be stated) specified in said certificate,
          which liens and encumbrances will be discharged upon payment
          of such indebtedness and encumbrances to which this Lease is
          subject; and

               b.   that no Event of Default has occurred which has
          not been remedied.

          3.   Evidence reasonably satisfactory to the Proceeds Trustee and
     Landlord showing that there has not been filed with respect to
     Tenant's leasehold estate or Tenant's or Landlord's interest in the
     Premises or any part thereof any vendor's, mechanic's, laborer's or
     materialman's statutory or similar lien which has not been discharged
     of record, except such as will be discharged upon payment of the
     amount then requested to be disbursed.

          4.   Lien waivers from each person entitled to a mechanic's or
     materialman's lien against the Premises by reason of such work.

          5.   Upon compliance with the foregoing provisions, the Proceeds
     Trustee shall, out of the deposited sums, disburse to the persons
     named in the certificate the respective amounts stated in said
     certificate to be due to them and/or shall disburse to Tenant the
     amount stated in said certificate to have been paid by Tenant.

          6.   At any time after the completion in full of the work, the
     whole balance of the deposited sums not theretofore disbursed pursuant
     to the foregoing provisions of this subparagraph shall be disbursed to
     or upon the order of Tenant, upon receipt by the Proceeds Trustee of
     any of the following:

               a.   a certificate signed by Tenant, dated not more
          than twenty (20) days prior to the application for such
          disbursement, setting forth in substance the following to
          the best knowledge of Tenant, after due inquiry;

                    (1)  that the work has been completed in
               full;

                    (2)  that all amounts which Tenant is or may
               be entitled to have disbursed under the foregoing
               provisions of this subparagraph on account of
               services rendered or materials furnished in
               connection with the work have been disbursed 


                                     -21-

<PAGE>

               under said provisions;

                    (3)  that all amounts for whose payment
               Tenant is or may become liable in respect of the
               work have been paid in full except to the extent,
               if any, of any retainage and which retainage shall
               be applied to the final payments of the amounts
               due; and

                    (4)  that no Event of Default has occurred
               which has not been remedied;

               b.   a copy of the final plans and specifications of
          the improvements in the Premises, which plans and
          specifications shall be delivered to Landlord;

               c.   an official search or a certificate of a title
          company reasonably satisfactory to the Proceeds Trustee
          showing that there has not been filed with respect to
          Tenant's leasehold estate or Tenant's or Landlord's interest
          in the Premises, or any part thereof, any vendor's
          mechanic's, laborer's or materialman's statutory or similar
          lien which has not been discharged of record;

               d.   a certificate of completion signed by the
          supervising architect or engineer referred to in
          subparagraph (1) above; and

               e.   a certificate of occupancy or equivalent
          governmental approval.

          Any insurance proceeds remaining after completion of the
reconstruction as specified in subparagraph 6. above shall be paid to Tenant. 
If the conditions for the release of money to Tenant are not met after a period
of one hundred eighty (180) days after the date of completion of reconstruction
(such 180 day period to be extended by the length of any delay caused by reasons
beyond the control of Tenant), any funds held by the Proceeds Trustee shall be
disbursed to Landlord or its assignee.  If the Premises shall be damaged by fire
or other casualty resulting from the fault or negligence of Tenant or any of
Tenant's agents, employees, or invitees, then (a) Rent shall not be diminished
during the repair of such damage, and Tenant shall be liable to Landlord for the
cost and expense of the repair and restoration of the Premises caused thereby to
the extent that such cost and expense is not covered by insurance proceeds.

     20.2  CONDEMNATION.

          A.   TOTAL OR SUBSTANTIAL CONDEMNATION. If all or substantially all of
the Premises shall be taken for public or quasi-public purposes, or if Tenant,
after any taking, would be unable to restore the Buildings to substantially
their condition prior to such event because it is legally impermissible or not
physically or financially feasible to do so with the proceeds of the
condemnation award or the portion remaining can (in Landlord's reasonable


                                     -22-

<PAGE>

judgment), with rebuilding, restoration or repair, be profitably operated for
the purpose it was being used immediately prior to the taking or diminution (a
"Substantial Taking") Tenant shall, not later than ninety (90) days after the
date of service of an order for possession on Landlord or Tenant by the
condemning agency or condemning authority, deliver to Landlord (i) notice of its
intention to terminate this Lease on a date (the "Termination Date") occurring
not more than one hundred eighty (180) days nor less than ninety (90) days after
the date of service of such order for possession on Landlord or Tenant provided,
that the determination of the Termination Date shall be subject to the authority
of the condemning agency, condemning authority, or any stay or vacation of such
order issued pursuant to applicable law, (ii) a certificate by Tenant describing
the event giving rise to such termination and stating that such event has
rendered the Premises unavailable for use or unsuitable for restoration for
continued use of occupancy in Tenant's business, and (iii) an irrevocable offer
to purchase the Premises, together with any condemnation award or rights
thereto, on the next Rent payment date occurring more than thirty (30) days
after the receipt of, by Landlord, such offer.  The purchase price pursuant to
any such offer to purchase the Premises shall be the sum necessary to satisfy
any and all amounts due and owing, including all unpaid principal, all accrued
and unpaid interest, (but not any prepayment premium on First Mortgage)
(hereinafter the "Purchase Price").  Landlord shall have thirty (30) days after
receipt of notice within which to reject such offer.  If Landlord rejects the
offer, this Lease shall terminate on the Termination Date, except with respect
to obligations and liabilities of Tenant hereunder, actual or contingent, which
have arisen on or prior to such date, upon payment by Tenant of all unpaid Rent,
Additional Rent and other sums then due and payable hereunder to and including
such date.  If Landlord rejects the offer, any condemnation proceeds shall
belong to Landlord or to Landlord's mortgagee, provided, however, that nothing
herein contained shall prevent Tenant from pursuing its own remedies with
respect to business interruption, moving expenses, fixtures and other costs to
Tenant provided that such remedies do not result in a decrease in any award to
Landlord.  If Landlord does not reject Tenant's offer within the thirty (30) day
period, the offer shall be deemed accepted and on the next Rent payment date
occurring more than thirty (30) days after the receipt by Landlord of such
offer, Landlord shall convey the Premises and any condemnation award and the
right thereto to Tenant upon payment of the Purchase Price and all Rent and
other sums due and payable hereunder to and including such date.  Title to the
Premises shall be subject only to encumbrances existing on the Commencement
Date, this Lease, encumbrances arising after the Commencement Date not consented
to or created by Landlord, and other encumbrances consented to at any time by
Tenant.  Tenant shall accept a special or limited warranty deed conveying such
title and shall accept the Premises in their "as is" condition.  Upon completion
of such purchase, but not prior thereto, this Lease shall terminate, except with
respect to obligations and liabilities hereunder, actual or contingent, which
arose on or prior to the date of purchase.  Tenant shall bear all costs
associated with such conveyance.  A "taking" under this Paragraph shall be
deemed to have occurred at such time as the relevant governmental authority
effecting the "taking" shall have taken possession of the Premises pursuant to a
court order or judgment by a court of captioned jurisdiction in accordance with
applicable law.

          B.   PARTIAL CONDEMNATION.  If less than the whole or substantially
the whole of the Premises is taken for any public or quasi-public use under any
governmental 


                                     -23-

<PAGE>

law, ordinance, or regulation, or by right of eminent domain, or should be 
sold to a condemning authority in lieu of condemnation, and such taking is 
not a Substantial Taking, and no Event of Default under the First Mortgage 
has occurred or is continuing, then Tenant shall (1) deliver to Landlord 
plans and specifications for such rebuilding, restoration or repair 
acceptable to Landlord, and (2) thereafter commence the rebuilding, 
restoration or repair of the Premises in accordance with the approved plans 
and specifications within three (3) months after the date of the taking or 
diminution in value; provided, however, that Tenant's restoration and 
rebuilding obligations shall not exceed the scope of the work done by Tenant 
in originally constructing the Premises.

          C.   DISPOSITION OF AWARDS.  Except as herein otherwise provided, all
awards arising from a total or partial taking of the Premises, or a taking for
temporary use, shall belong to and be the property of Landlord or during the
period there is a first mortgage covering the Premises of Landlord's mortgagee,
without any participation by Tenant.  Tenant shall not be entitled to, and
expressly waives all claim to, any such compensation; provided, however, that
Tenant shall be entitled to receive the proceeds of any award specifically
designated by the condemning authority in Tenant's favor, for Tenant's
improvements on Premises and/or relating solely to Tenant's statutory right of
compensation for the loss of its leasehold.  Notwithstanding the above, if
Tenant has complied with the provisions of Paragraph B above, all of the
condemnation award granted by the condemning authority for the taking or
diminution in value of the Premises shall be paid over to Tenant by Landlord,
after deducting therefrom the reasonable actual costs and expenses incurred by
Landlord, including reasonable attorney's fees, in connection with such
condemnation and collection of the award.

          D.   SUBJECT TO FIRST MORTGAGE.  Notwithstanding any provision in this
SECTION 20, this SECTION 20 shall be subject in all respects to the provisions
of the First Mortgage regarding condemnation and eminent domain.

                                   ARTICLE XXI

                                 EXISTING LEASES

          Landlord and Tenant hereby acknowledge and agree that the Existing
Leases are still in full force and effect and that Tenant's right to possess,
use and occupy those portions of the Premises described in the Existing Leases
shall be subject to the Existing Leases and shall not commence unless and until
the Existing Leases expire or are terminated.  Notwithstanding the foregoing,
however, Tenant's obligation to pay or cause to be paid the Rent shall commence
on the Commencement Date, and Landlord, pursuant to that certain Assignment of
Rents to Tenant, has assigned to Tenant the right to receive all rents and other
amounts from the Existing Leases .  Tenant shall have the right to direct
Landlord regarding negotiations with Existing Tenants concerning the Existing
Leases and to direct Landlord to terminate the Existing Leases on terms and
conditions acceptable to Tenant without Landlord's consent.  So long as an Event
of Default has not occurred under this Lease, Landlord shall immediately deliver
to Tenant any and all amounts that Landlord may hereafter receive from Existing
Tenants with respect to the Existing Leases.  Landlord shall have no right to
modify, amend or terminate the Existing 


                                     -24-

<PAGE>

Leases without the prior written consent of Tenant.  Prior to the expiration 
or termination of the Existing Leases, Landlord will perform all of the 
duties and obligations of the Landlord under the Existing Leases; provided, 
however, that Tenant shall have no right to modify or amend the Existing 
Leases so as to increase the maintenance, repair or other duties and 
obligations of the Landlord under the Existing Leases without the prior 
written consent of Landlord.  Tenant shall indemnify Landlord for any damages 
and liabilities that Landlord may suffer or incur as a result of Landlord 
being made a party to any litigation that may hereafter arise between Tenant 
and Existing Tenants concerning the Existing Leases except to the extent that 
such litigation concerns the failure of Landlord to perform any of the duties 
and obligations of the landlord under the Existing Leases or the negligence 
or misconduct of Landlord.

     After the termination of the Existing Leases, Tenant, at Tenant's option,
shall have the right to, among other things, occupy all or any portion of the
Premises for Tenant's own use or sublease all or any portion of the Premises to
a third party (subject to limitations therein set forth in this Lease or in the
First Mortgage); provided, however, that Tenant shall remain liable for payment
of the Rent during the Term of this Lease.

                                  ARTICLE XXII

                              ENVIRONMENTAL MATTERS

          A.   Tenant (i) shall comply, and cause the Premises to comply, with
all Environmental Laws (as hereinafter defined) applicable to the Premises, (ii)
shall prohibit the use of the Premises for the generation, manufacture,
refinement, production, or processing of any Hazardous Material (as hereinafter
defined) or for the storage, handling, transfer or transportation of any
Hazardous Materials (other than in connection with the operation, business and
maintenance of the Premises and in commercially reasonable quantities as a
consumer thereof and supplier of consumer products and in compliance with
Environmental Laws), (iii) shall not permit to remain, install or permit the
installation on the Premises of any surface impoundments, or asbestos-containing
materials and (iv) shall cause any alterations of the Premises to be done in a
way so as to not expose in an unsafe manner the persons working in or visiting
the Premises to Hazardous Materials and in connection with any such alterations
shall remove any Hazardous Materials present upon the Premises, excepting any
Hazardous Material or Substance situated on or under the Premises at the time of
Tenant's taking possession under this Lease, which are not in compliance with
Environmental Laws or which present danger to persons working on or visiting the
Premises.

          B.   "Environmental Laws" means the Resource Conservation and Recovery
Act of 1976, as amended, 42 U.S.C. section 6901, et seq. (RCRA); the
Comprehensive Environmental Response, Compensation and Liability Act of 1980, as
amended by the Superfund Amendments and Reauthorization Act of 1986, 42 U.S.C.
section 9601 et seq. (CERCLA); the Toxic Substance Control Act, as amended, 15
U.S.C. section 26012 et seq.; Texas Water Code; and all applicable federal,
state and local environmental laws, ordinances, rules and regulations, as any of
the foregoing may have been or may be from time to time amended, supplemented or
supplanted, and any other federal, state, or local 


                                     -25-

<PAGE>

laws, ordinances, rules and regulations, now or hereafter existing relating 
to regulations or control of Hazardous Material or materials.  The term 
"Hazardous Materials" as used in this Lease shall mean substances defined as 
"hazardous substances," "hazardous materials," "hazardous waste," or "toxic 
substances" in any applicable federal, state or local statute, rule, 
regulation or determinations, including but not limited to the Comprehensive 
Environmental Response, Compensation and Liability Act of 1980, as amended, 
42 USC, Section 9601, et seq.; the Hazardous Materials Transpiration Act, 49 
USA, Section 1801, et seq.; the Resource, Conservation and Recovery Act, 42 
USC, Section 6901, et seq.; and, asbestos, PCBs, radioactive substances, 
methane, volatile hydrocarbons, petroleum or petroleum-derived substances or 
wastes, radon, industrial solvents or any other material as may be specified 
in applicable law or regulations.

          C.   Except for liability resulting from or arising out of the willful
misconduct of Landlord or its mortgagee or their agents on or about the Premises
or their successors and assigns, and except as otherwise specifically excluded
from any indemnities of Landlord contained in the First Mortgage, Tenant agrees
to protect, defend, indemnify and hold harmless Landlord, its directors,
officers, employees and agents, and any successors to Landlord's interest in the
chain of title to the Premises, their direct or indirect partners, directors,
officers, employees, and agents, from and against any and all liability,
including all foreseeable and all unforeseeable damages including but not
limited to attorney's and consultant's fees, fines, penalties and civil or
criminal damages, directly or indirectly arising out of the use, generation,
storage, treatment, release, threatened release, presence or disposal of
Hazardous Materials from, on, at, to or under the Premises during the Term of
this Lease, and including, without limitation, the cost of any required or
necessary repair, response action, remediation, investigation, cleanup or
detoxification and the preparation of any closure or other required plans,
whether such action is required or necessary prior to or following transfer of
title to the Premises.  This agreement to indemnify and hold harmless shall be
in addition to any other obligations or liabilities Tenant may have to Landlord
at common law under all statutes and ordinances or otherwise, and shall survive
following the date of expiration or earlier termination of this Lease.  Tenant
expressly agrees that the representations, warranties and covenants made and the
indemnities stated in this Lease are not personal to Landlord, and the benefits
under this Lease may be assigned to subsequent parties in interest in the chain
of title to the Premises, which subsequent parties in interest may proceed
directly against Tenant to recover pursuant to this Lease.  Tenant, at its
expense, may institute appropriate legal proceedings with respect to
environmental matters of the type specified in this subparagraph C or lien for
such environmental matters, not involving Landlord or its mortgagee as a
defendant (unless Landlord or its mortgagee is the alleged cause of the damage),
conducted in good faith and with due diligence, provided that such proceedings
shall not in any way impair the interests of Landlord or its mortgagee under
this Lease or contravene the provisions of any first mortgage.  Counsel to
Tenant in such proceedings shall be reasonably approved by Landlord if Landlord
is a defendant in the same proceeding.  Landlord shall have the right to appoint
co-counsel, which co-counsel will cooperate with Tenant's counsel in such
proceedings.  The fees and expenses of such co-counsel shall be paid by
Landlord, unless such co-counsel are appointed because the interests of Landlord
and Tenant in such proceedings, in Landlord's reasonable judgment, 


                                     -26-

<PAGE>

are or have become adverse, or Tenant or Tenant's counsel is not conducting 
such proceedings in good faith or with due diligence.

          D.   Tenant, promptly upon the written request of Landlord or
Mortgagee, from time to time, but not more than once in any calendar year unless
required by a governmental order or unless an Event of Default has occurred and
is continuing, shall permit such persons as Landlord or Mortgagee may designate
subject to approval by Tenant (the "Site Reviewers"), which approval shall not
be unreasonably withheld or delayed, to visit the Premises from time to time and
perform environmental site investigations and assessments ("Site Assessments")
on the Premises.  Tenant's approval of the Site Reviewers shall not be required
if an Event of Default has occurred and is continuing.  The purpose of the Site
Assessment swill be to determine whether there exists on the Premises any
environmental condition which may result in any liability, cost or expense to
Landlord or any other owner or occupier of the Premises relating to Hazardous
Materials.  During the course of any Site Assessment, the Site Reviewers shall
not unreasonably interfere with the operations or business of Tenant on the
Premises.  The Site Assessments may include both above and below ground testing
and inspection as is reasonable and necessary in the opinion of the Site
Reviewers to identify environmental damage or the presence of Hazardous Material
on the Premises.  Tenant shall supply to the Site Reviewers such historical and
operational information regarding the Premises as may be reasonably requested by
the Site Reviewers to facilitate the Site Assessments and shall make available
for meetings with Site Reviewers appropriate personnel having knowledge of such
matters.  Tenant shall not be required to make information available to the Site
Reviewers where such information was previously provided to Landlord by Tenant.
The cost of performing and reporting all Site Assessments shall be paid by
Tenant on the same basis as Landlord is required to pay under the First
Mortgage, and such costs will be paid by Tenant within thirty (30) days after
demand by Landlord, with interest to accrue after the expiration of such thirty
(30) day period, on the cost due, at the Default Rate.  Landlord, promptly after
written request by Tenant and payment by Tenant as aforesaid, shall deliver to
Tenant copies of reports, summaries or other compilations of the results of such
Site Assessments.  Tenant's sole remedy for Landlord's breach of the preceding
sentence shall be a mandatory injunction, and not a termination of this Lease or
a withholding or reduction or rent.

          E.   Tenant shall notify Landlord and Landlord shall notify Tenant in
writing, promptly upon Tenant's or Landlord's learning of any:

               1.   notice or claim to the effect that Tenant or Landlord
     is or may be liable to any person as a result of the release or
     threatened release of any Hazardous Material on the Premises;

               2.   notice that Tenant is subject to investigation by any
     governmental authority evaluating whether any remedial action is
     needed to respond to the release or threatened release of any
     Hazardous Material on the Premises.

               3.   notice of the presence of any Hazardous Materials on the
     Premises


                                     -27-

<PAGE>

                                  ARTICLE XXIII

                            MISCELLANEOUS PROVISIONS

     23.1 NOTICE.  Any notice or request (hereinafter severally and collectively
called "notice") in this Lease provided for or permitted to be given, made or
accepted by either party to the other must be in writing, and may, unless
otherwise in this Lease expressly provided, be given or be served by depositing
the same in the United States mail, postpaid and certified and addressed to the
party to be notified, with return receipt requested, or by delivering the same
in person to such party (or, in the case of a corporate or partnership party, to
an officer or general partner of such party, as the case may be), or by prepaid
telegram, when appropriate, addressed to the party to be notified.  Notice
deposited in the mail in the manner hereinabove described shall be effective,
unless otherwise stated in this Lease, from and after the date it is so
deposited.  Notice given in any other manner shall be effective only if and when
received by the party to be notified.  For purposes of notice, the addresses of
the parties shall, until changed as herein provided, be as follows:  

          For Landlord:            IPOP Management, Inc.
                                   11104 Airport Boulevard
                                   Suite 200
                                   Stafford, Texas 77477
                                   Attention:   President

          For Tenant:              Input/Output, Inc.
                                   11104 Airport Boulevard
                                   Suite 200
                                   Stafford, Texas 77477
                                   Attention: Chief Financial Officer

     Landlord and Tenant may, from time to time and at any time, change their
respective addresses by at least fifteen (15) days' written notice to the other
party, delivered in compliance with SECTION 22.1.

     23.2  BROKER'S COMMISSION.  Tenant and Landlord hereby indemnify each
other, and shall hold each other harmless from and against, all liabilities
arising from any claim for a "broker's or leasing agent's" commission.

     23.3  FORCE MAJEURE.  If the performance by Landlord of any provision of
this Lease is delayed or prevented by any act of God, strike, lockout, shortage
of material or labor, restriction by any governmental authority, civil riot,
flood, and any other cause not within the control of Landlord, then the period
for Landlord's performance of the provision shall be automatically extended for
the same amount of time that Landlord is so delayed or hindered.

     23.4  USE OF LANGUAGE.  Words of any gender used in this Lease include any
other gender, and words in the singular include the plural, unless the context
otherwise requires.


                                     -28-

<PAGE>

     23.5  CAPTIONS.  The captions or headings of paragraphs in this Lease are
inserted for convenience only, and shall not be considered in construing the
provisions hereof if any question of intent arises.

     23.6  SUCCESSORS.  The terms, conditions and covenants contained in this
Lease inure to the benefit of, and are binding on, the parties hereto and their
respective successors in interest, assigns and legal representatives, except as
otherwise herein expressly provided.  All rights, powers, privileges, immunities
and duties of Landlord under this Lease, including without limitation, notices
required or permitted to be delivered by Landlord to Tenant hereunder, may, at
Landlord's option, be exercised or performed by Landlord's agent or attorney.

     23.7  SEVERABILITY.  If any provision of this Lease is finally held by a
court of competent jurisdiction to be invalid or unenforceable, then the invalid
or unenforceable provision shall be deemed severed from this Lease and the
validity and enforceability of the remaining provisions of this Lease shall be
unaffected.

     23.8  PERSONAL LIABILITY.  Landlord's liability to Tenant for any default
by Landlord under this Lease is limited to Landlord's interest in the Premises,
and Tenant agrees to look solely to Landlord's interest therein for the recovery
of any judgment against Landlord, it being intended that neither Landlord nor
any of its partners, shareholders, agents, affiliates, officers or directors
shall be personally liable for any judgment or deficiency.

     23.9  DAMAGE FROM CERTAIN CAUSES.  Landlord is not liable or responsible to
Tenant for any loss or damage to any property or person occasioned by theft,
fire, act of God, public enemy, injunction, riot, strike, insurrection, war,
court order, requisition, or order of governmental body or authority, or for any
damage or inconvenience that may arise through repair or alteration of any part
of the Premises, or a failure to make any such repairs.

     23.10  GOVERNING LAW.  This Lease and the rights and obligations of the
parties hereto shall be interpreted, construed, and enforced in accordance with
the laws of Texas.

     23.11  NO PARTNERSHIP.  Notwithstanding anything else to the contrary, 
Landlord is not and under no circumstances shall it be considered to be a 
partner of Tenant or engaged in a joint venture with Tenant.

     23.12  NO ORAL CHANGES.  This Lease may not be changed or terminated
orally, but only in writing executed by Landlord, Tenant and Mortgagee.

     23.13  ENTIRETY; NO REPRESENTATIONS AND WARRANTIES.  THIS LEASE EMBODIES
THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND SUPERSEDES ALL PRIOR AGREEMENTS AND
UNDERSTANDINGS, INCLUDING ANY LETTERS OF INTENT, IF ANY, RELATING TO THE SUBJECT
MATTER HEREOF.  LANDLORD HAS NOT MADE, AND TENANT MAY NOT RELY ON, ANY
REPRESENTATIONS OR WARRANTIES WITH REGARD TO THE PREMISES, 


                                     -29-

<PAGE>

EXPRESSED OR IMPLIED, EXCEPT AS STATED IN THIS LEASE.  IN PARTICULAR, 
LANDLORD HAS NOT AUTHORIZED ANY AGENT OR BROKER TO MAKE A REPRESENTATION OR 
WARRANTY IN ADDITION TO OR INCONSISTENT WITH THE TERMS OF THIS LEASE AND 
TENANT MAY NOT RELY ON ANY SUCH ADDITIONAL OR INCONSISTENT REPRESENTATION OR 
WARRANTY.

   23.14  MULTIPLE COUNTERPARTS.  This Lease may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
agreement, and any of the parties to this Lease may execute this Lease by
signing any of the counterparts.




                      [THIS SPACE INTENTIONALLY LEFT BLANK]












                                     -30-

<PAGE>


                                 SIGNATURE PAGE


     EXECUTED as of the 29th day of August, 1996.


                                   LANDLORD:

                                   IPOP MANAGEMENT, INC.

                                   By: /s/ Robert P. Brindley, President


                                   TENANT:

                                   INPUT/OUTPUT, INC.

                                   By: /s/ Robert P. Brindley, Senior Vice
                                   President, Chief Financial Officer
                                   and Secretary 


                                   CONSENTED AND AGREED TO BY MORTGAGEE:

                                   THE VARIABLE ANNUITY LIFE INSURANCE COMPANY


                                   By:/s/ Rembert R. Owen, Jr.













                                     -31-

<PAGE>


                                   LIMITED GUARANTY


    1.   For and in consideration of the sum of TEN DOLLARS ($10.00) and other
good and valuable considerations in hand paid to INPUT/OUTPUT, INC.,
(hereinafter called "GUARANTOR", whether one or more), a Delaware corporation,
the receipt and sufficiency of which considerations are hereby acknowledged, and
for the purpose of enabling IPOP MANAGEMENT, INC., a Delaware corporation
(hereinafter called "DEBTOR"), to borrow certain funds from THE VARIABLE ANNUITY
LIFE INSURANCE COMPANY, (hereinafter called "HOLDER") a Texas corporation, and
to induce Holder to advance to Debtor the proceeds of that certain Promissory
Note of even date executed by Debtor in the original principal amount of
$12,550,000.00 (the "NOTE") payment of which is secured by that certain Deed of
Trust and Security Agreement (the "DEED OF TRUST") covering the property therein
described (the "MORTGAGED PROPERTY"), any of the other collateral securing
payment of the Note (the "OTHER COLLATERAL") and all other instruments securing
the payment of the Note (which together with the Deed of Trust are herein
collectively referred to as the "SECURITY INSTRUMENTS"), and recognizing that
but for this Guaranty (i) the loan evidenced by the Note would not be made by
the Holder to the Debtor, and (ii) the funds would not be advanced thereunder,
Guarantor hereby unconditionally and jointly and severally guarantees to Holder
the prompt payment (or accounting to Holder by delivery of funds) for the
following (hereinafter called the "OBLIGATIONS"): (a) all condemnation awards
and proceeds and insurance proceeds received by Debtor or Guarantor (to the
extent same have not theretofore been applied toward payment of the sums due
under the Note or used for repair, restoration or replacement of the Mortgaged
Property and, with respect to such insurance proceeds which represent proceeds
paid under any rent insurance, business interruption insurance or other similar
types of insurance, to the additional extent such rent, business interruption
insurance or other similar insurance proceeds have not theretofore been applied
toward the payment of taxes and insurance premiums); (b) all amounts necessary
to repair any damage to the Mortgaged Property, excluding normal wear and tear,
caused by acts or omissions of Debtor, its agents, employees, or contractors;
(c) all security deposits; (d) failure of Debtor to pay, in accordance with the
Deed of Trust, taxes, assessments or other charges which can create liens on any
portion of the Mortgaged Property or the Other Collateral and are payable under
the Security Instruments (to the full extent of any such taxes, assessments or
other charges); (e) failure of Debtor to pay charges for labor or materials or
other charges which can create liens on any portion of the Mortgaged Property or
the Other Collateral (to the full extent of the amount rightfully claimed by any
such claimant); (f) prepaid rent and rental or other income derived from the
Mortgaged Property or the Other Collateral from and after the occurrence of a
default under the Note or the Security Instruments (whether any of such
condemnation awards, insurance proceeds, income or other funds derived from the
Mortgaged Property are held by Holder or received by Debtor or Guarantor); (g)
any loss incurred by Holder as a result of Debtor's forfeiture of the Mortgaged
Property resulting from criminal activity by any person whether or not such
criminal activity is conducted on or in any manner relates to the Mortgaged
Property or the Other Collateral; (h) all sums due Holder, excluding payments of
principal and accrued interest due pursuant to the Note, following exercise by
Holder of its right to perform Debtor's obligations under the Security
Instruments to preserve, protect or defend the Mortgaged Property as Collateral
for the Note after notice and opportunity to cure, if any, as provided in the
Security Instruments; (i) any loss, damage or injury sustained by Holder arising
from the breach of any warranty or representation of Debtor contained in any
affidavit made by or on behalf of Debtor or in any of the Security Instruments
regarding hazardous wastes or other hazardous or toxic substances; (j) any loss,
damage, or injury sustained by Holder arising from the breach of the warranties,
representations, covenants and/or indemnities given by Debtor and contained in
Article 11 of the Mortgage relating to "HAZARDOUS MATERIALS" (as therein
defined); and (k) all reasonable costs, attorneys' fees and expenses incurred or
expended by Holder in collecting any of the foregoing or due to any default in
the performance of the foregoing or in enforcing any right granted hereunder.

<PAGE>

    2.   Notwithstanding the provisions contained in the Note relating to the
limitation on the liability of Debtor for failure to perform thereunder, the
Guarantor is and shall remain liable to Holder in accordance with the terms and
provisions of this Guaranty.

    3.   All amounts becoming payable by Guarantor to Holder under this
Guaranty shall be payable at Holder's offices in Houston, Harris County, Texas,
or such other place as Holder may from time to time designate.

    4.   In each event whenever any of the Obligations shall become due and
remain unpaid (howsoever the maturity thereof may have occurred), Guarantor,
will, on demand, pay the amount due thereon to Holder, without further notice of
dishonor and without any notice having been given to Guarantor previous to such
demand of the acceptance by Holder of this Guaranty or of the creating or
incurring of such indebtedness Guarantor specifically agrees that it shall not
be necessary or required in order to enforce Guarantor's obligations under this
Guaranty that Holder have made demand for payment upon Debtor or any other
person liable thereon or have made protest thereof or have given notice to
Debtor or any other party liable thereon of maturity or nonpayment of said
Obligations, or have realized upon or sought the benefits of any security for
the Obligations.

    5.   Guarantor specifically waives any notice of acceptance of this
Guaranty by Holder and of the creation, advancement, existence, extension,
renewal or rearrangement of the Note or the Security Instruments, or increase or
reduction of the rate of interest thereon, or any indulgence with respect
thereto, or any part thereof, and of nonpayment thereof or default thereon, and
waives grace, demand, protest, presentment and notice of demand, notice of
intention to accelerate maturity, notice of acceleration, protest, and
presentment with respect to the Note, and waives notice of the amount of the
Obligations outstanding at any time, and agrees that the maturity of the
Obligations, or any part thereof, may be accelerated, extended, modified,
amended or renewed or any other indulgence may be granted with respect thereto
by Holder at its will or as may be agreed by Debtor without notice to or further
consent by Guarantor, at any time or times Guarantor acknowledges that Holder
shall have the right to off-set against any funds of Debtor held by Holder
(including, without limitation, escrows for taxes and insurance) pursuant to the
Note and any of the Security Instruments.  Guarantor also waives defenses and
claims based on principles of suretyship and/or guaranty.  

    6.   Guarantor agrees that no renewal, extension or rearrangement of or any
other indulgence with respect to the Note or the Security Instruments, or any
part thereof, or increase or reduction of the rate of interest thereon, no
release of or substitution for any security or other guaranty now or hereafter
held by Holder for payment of the Note or the Obligations, or of any part
thereof, no release of Debtor, or of any other person primarily or secondarily
liable on the Note or the Obligations, or any part thereof, and no delay or
omission or lack of diligence or care in exercising any right or power with
respect to the Note or the Obligations or any security therefor or guaranty
thereof or under this Guaranty shall in any manner impair or affect the rights
of Holder or the obligations and liability of Guarantor hereunder.  Guarantor
specifically agrees that it shall not be necessary or required, and that
Guarantor shall not be entitled to require, that Holder file suit or proceed to
obtain or assert a claim for personal judgment against Debtor for the
Obligations or make any effort at collection of the Obligations from Debtor or
foreclose against or seek to realize upon any security now or hereafter existing
for the Note or the Obligations or file suit or proceed to obtain or assert a
claim for personal judgment against any other party (maker, guarantor, endorser
or surety) liable for the Obligations or make any effort at collection of the
Obligations from any such other party or exercise or assert any other right or
remedy to which Holder is or may be entitled in connection with the Note or the
Obligations or any security or other guaranty therefor or assert or file any
claim against the assets or estate of Debtor or any other guarantor or other
person liable for the Obligations, or any part thereof, before or as 


                                     -2-

<PAGE>

a condition of enforcing the liability of Guarantor under this Guaranty or 
requiring payment of the Obligations by Guarantor hereunder, or at any time 
thereafter.  Guarantor expressly waives any right to the benefit of or to 
require or control application of any security or the proceeds of any 
security now existing or hereafter obtained by Holder as security for the 
Obligations, or any part thereof, and agrees that Holder shall have no duty 
insofar as Guarantor is concerned to apply upon any of the Obligations any 
monies, payments or other property at any time received by or paid to or in 
the possession of Holder, except as Holder shall determine in its sole 
discretion.  Guarantor specifically agrees that Guarantor shall not have any 
recourse or action against Holder by reason of any action Holder may take or 
omit to take in connection with the Note, the Security Instruments or the 
Obligations, the collection of any sums or amounts herein mentioned, or in 
connection with any security or any other guaranty at any time existing 
therefor.

    7.   Guarantor agrees to the terms, provisions and conditions of the Note
and of any renewal, extension, modification or rearrangement note or notes or
other agreements which may have been or may hereafter be executed by Debtor
evidencing or in connection with the Note or the Obligations or any part
thereof, and agrees that Guarantor's liability hereunder shall in no manner be
affected, impaired or released by reason of any term, provision or condition of
any such note or other agreement or by failure, refusal or omission of Holder to
enforce or observe any of same or any action taken or omitted to be taken by
Holder pursuant thereto or in connection therewith.

    8.   Guarantor absolutely and unconditionally covenants and agrees that in
the event that Debtor does not or is unable so to pay or perform the Obligations
for any reason, including, without limitation, liquidation, dissolution,
receivership, insolvency, bankruptcy, assignment for the benefit of creditors,
reorganization, arrangement, composition or readjustment of or other similar
proceedings affecting the status, composition, identity, existence, assets or
obligations of Debtor, or the disaffirmance or termination of any of the
Obligations in or as a result of any such proceeding, Guarantor shall pay and
perform the Obligations and that no such occurrence shall in any way affect
Guarantor's obligations hereunder.

    9.   If the status of Debtor changes, including, but not limited to, a
merger, dissolution, consolidation or reorganization, this Guaranty shall
continue and also cover the indebtedness and Obligations of Debtor under the new
status according to the terms hereof.

    10.  In the event any payment of Debtor to Holder is held to constitute a
preference under the bankruptcy laws, or if for any other reason Holder is
required to refund such payment or pay the amount thereof to any other party,
such payment by Debtor to Holder shall not constitute a release of Guarantor
from any liability hereunder, but Guarantor agrees to pay such amount to Holder
upon demand and this Guaranty shall continue to be effective or shall be
reinstated, as the case may be, to the extent of any such payment or payments.

    11.  All payments made upon the Obligations at any time shall be deemed to
have been paid by Debtor unless express notice in writing is given to the Holder
at the time of payment by Guarantor that Holder has been paid by him.  The
payment by Guarantor of any amount pursuant to this Guaranty shall not in
anywise entitle Guarantor to any right, title or interest (whether by way of
subrogation or otherwise) in and to any of the Obligations or any proceeds
thereof, or any security therefor, unless and until the full amount owing to
Holder on the Obligations has been fully paid, but when the same has been fully
paid Guarantor shall be subrogated as to any payments made by it to the rights
of Holder as against Debtor and/or any endorsers, sureties or other guarantors.

    12.  If any or all of the Obligations are now or hereafter secured in whole
or in part, Guarantor agrees that Holder may, from time to time, at its
discretion, and with or without valuable consideration, allow 


                                     -3-

<PAGE>

substitution or withdrawal of collateral or release all or any part of such 
security, without notice or consent by Guarantor, and without in anywise 
impairing, diminishing or releasing the liability of Guarantor hereunder.

    13.  Guarantor agrees to pay to Holder all reasonable costs and expenses
(including court costs and attorneys' fees) incurred by the Holder in the
enforcement of this Guaranty.

    14.  No provision contained herein or in the Note or any Security
Instruments executed by the Debtor or Guarantor shall require the payment or
permit the collection of interest in excess of the maximum permitted by
applicable usury laws.  If any excess of interest in such respect is provided
for herein or in the Note or any Security Instruments, the provisions of this
paragraph shall govern and neither the Debtor nor Guarantor shall be obligated
to pay the sum of such interest to the extent that it is in excess of the amount
permitted by law; the intention of the parties being to conform strictly to
usury laws now or hereafter in effect and applicable to the Obligations, and
shall be held subject to reduction to the amount allowed under applicable usury
laws as now or hereafter construed by the courts having jurisdiction thereof.

    15.  Guarantor agrees, to the full extent it may legally do so, that suit
may be brought against Guarantor with or without making Debtor a party to such
suit (as Holder may elect).

    16.  Guarantor waives all defenses given to sureties or guarantors at law
or in equity other than actual payment of the Obligations. The failure by Holder
to file or enforce a claim against the estate (either in administration,
bankruptcy or other proceeding) of Debtor or of any other or others shall not
affect the liability of Guarantor hereunder.

    17.  This Guaranty is intended for and shall inure to the benefit of 
Holder and each and every other person who shall from time to time be or 
become the owner or holder of the Note, and each and every reference herein 
to "HOLDER" shall also include and refer to each and every successor or 
assignee of Holder at any time holding or owning any part of or interest in 
any part of the Note. This contract of guaranty shall be transferable, it 
being understood and stipulated that upon the assignment or transfer by 
Holder of any of the Note (or any part thereof or interest therein thus 
transferred or assigned by Holder) shall also, unless provided otherwise by 
Holder in its assignment, have and may exercise all the rights granted to 
Holder under this Guaranty to the extent of the part of or interest in the 
Note thus assigned or transferred to said person.

    18.  If any of the following events occur or be continuing:

         (a)  An event of default occurs under the terms of the Note or any of
              the Security Instruments and continues beyond the time provided
              therein, if any, for the curing of such default; or

         (b)  If Guarantor defaults in the performance or observance of any
              agreement, covenant, term or condition contained herein; or

         (c)  If Guarantor makes an assignment for the benefit of creditors; or

         (d)  If Guarantor petitions or applies to any tribunal for the
              appointment of a trustee or receiver of the business, estate or
              assets or of any substantial part of the business, estate or
              assets of Guarantor or commences any proceedings relating to
              Guarantor under any bankruptcy, reorganization, arrangement,
              insolvency, readjustment of 


                                     -4-

<PAGE>

              debt, dissolution or liquidation law of any jurisdiction, 
              whether now or hereafter in effect; or

         (e)  If any such petition or application is filed or any such
              proceedings are commenced against Guarantor and Guarantor by any
              act indicates its approval thereof, consent thereto, or
              acquiescence therein, or an order is entered appointing any such
              trustee or receiver, or adjudicating Guarantor bankrupt or
              insolvent or approving the petition in any such proceedings, and
              such order remains in effect for more than sixty (60) days.

then an event of default under this Guaranty shall have occurred and the Holder
may, at its option, declare the Obligations to be, and the Obligations shall
thereupon be and become forthwith due and payable together with interest accrued
thereon under the terms of and with the effect provided in the Obligations, and
this Guaranty.

    19.  Any notice or demand to Guarantor hereunder or in connection herewith
may be given and shall conclusively be deemed and considered to have been given
and received upon the deposit thereof, in writing, in the U.S. Mail, duly
stamped and addressed to Guarantor at the address of Guarantor shown below; but
actual notice, however given or received, shall always be effective.  The last
preceding sentence shall not be construed in anywise to affect or impair any
waiver of notice or demand herein provided or to require giving of notice or
demand to or upon Guarantor in any situation or for any reason.

    20.  Unless the context clearly indicates otherwise, "GUARANTOR" shall mean
the guarantors hereunder or any of them.  The obligations of the guarantor
hereunder shall be joint and several.  Suit may be brought against said
guarantors, and against any one or more of them, less than all, without
impairing the rights of Holder against the others of said guarantors; and Holder
may compromise with any one of the guarantors for such sums or sum as it may see
fit and release such of said guarantors from all further liability to Holder for
such indebtedness without impairing the right of Holder to demand and collect
the balance of such indebtedness from others of said guarantors not so released;
but it is agreed among said guarantors themselves, however, that such
compromising and release shall in nowise impair the rights of said guarantors as
among themselves.

    21.  The rights of Holder are cumulative and shall not be exhausted by its
exercise of any of its rights hereunder or otherwise against Guarantor or by any
number of successive actions until and unless all Obligations have been paid or
performed.

    22.  Guarantor hereby subordinates any and all indebtedness of Debtor now
or hereafter owing to any Guarantor to all indebtedness of Debtor to Holder, and
agrees with the Holder that Guarantor shall not demand or accept any payment of
principal or interest from the Debtor if at such time Debtor is in default under
the Note or the Security Instruments and shall not claim any offset or other
reduction of Guarantor's liability hereunder because of any such indebtedness
and shall not take any action to obtain any of the security described in and
encumbered by any security in favor of Holder.


    23.  The rights of Holder are cumulative and shall not be exhausted by its
exercise of any of its rights hereunder or otherwise against Guarantor or by any
number of successive actions until and unless all indebtedness has been paid,
all Obligations have been performed and each of the Obligations of Guarantor
hereunder has been performed.


                                     -5-

<PAGE>

    24.  This Guaranty shall be deemed to have been made under and shall be
governed by the laws of the State of Texas in all respects and shall not be
waived, altered, modified or mended as to any of its terms or provisions except
in writing duly signed by Holder and Guarantor.

    25.  This Guaranty shall bind the successors and assigns of Guarantor and
shall inure to the benefit of all transferees, credit participants, assignees,
and/or endorsees of Holder.  The use of any gender herein shall include the
other genders.  A determination that any provision of this Guaranty is
unenforceable or invalid shall not affect the enforceability or validity of any
other provision.

    26.  The board of directors of each guarantor that is a corporation and
each general partner of each guarantor that is a partnership, has determined
that this Limited Guaranty may reasonably be expected to benefit such guarantor,
directly or indirectly.

    27.  Notwithstanding anything herein contained to the contrary, it is
understood and agreed that this is a limited guaranty, and that, with the
exception of the Obligations, Guarantor is not liable for payment of the Note.

    IN WITNESS WHEREOF, the undersigned has caused this Limited Guaranty to 
be executed under seal as of the 29 day of August, 1996.

                                  INPUT/OUTPUT, INC.,
                                   A DELAWARE CORPORATION


                                  BY: /s/ ROBERT P. BRINDLEY
                                  SENIOR VICE PRESIDENT, CHIEF FINANCIAL
                                  OFFICER & SECRETARY

                                  ADDRESS:  11104 WEST AIRPORT BOULEVARD
                                            SUITE 200
                                            STAFFORD, TEXAS  77477






                                     -6-

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S UNAUDITED FINANCIAL STATEMENTS FOR THE FIRST QUARTER ENDED 8/31/96
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAY-31-1997
<PERIOD-START>                             JUN-01-1996
<PERIOD-END>                               AUG-31-1996
<CASH>                                          14,000
<SECURITIES>                                         0
<RECEIVABLES>                                   92,093
<ALLOWANCES>                                         0
<INVENTORY>                                    100,601
<CURRENT-ASSETS>                               208,904
<PP&E>                                          60,101
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                 373,927
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