- -------------------------------------------------------------------------------

                                          
                                          
                                          
                                          
                                   UNITED STATES
                         SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, DC 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:   FEBRUARY 28, 1998

                                         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 ITS CHARTER)


           DELAWARE                                               22-2286646
(STATE OR OTHER JURISDICTION OF                                 (IRS 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: (281) 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 February 28, 1998 there were 44,451,293 shares of common stock, par value 
$0.01 per share, outstanding.

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                         INPUT/OUTPUT, INC. AND SUBSIDIARIES
                                          
                                 INDEX TO FORM 10-Q
                      FOR THE QUARTER ENDED FEBRUARY 28, 1998




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

  Consolidated Balance Sheets
    February 28, 1998 and May 31, 1997........................  2

  Consolidated Statements of Operations
     Three and nine months ended February 28, 1998 and 1997...  3

  Consolidated Statements of Cash Flows
     Nine months ended February 28, 1998 and 1997.............  4

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

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

Item 3.  Quantitative and Qualitative Disclosures about 
         Market Risk.......................................... 15

PART II.  Other Information.

Item 1.  Legal Proceedings.................................... 15

Item 2.  Changes in Securities................................ 16

Item 6.  Exhibits and Reports on Form 8-K..................... 16


                                       1



                      INPUT/OUTPUT, INC. AND SUBSIDIARIES
                          CONSOLIDATED BALANCE SHEETS    
                       (IN THOUSANDS, EXCEPT SHARE DATA) 
                                  (UNAUDITED)            

                                    ASSETS
                                                   FEBRUARY 28,    MAY 31,
                                                       1998         1997  
                                                   ------------    -------
Current assets:
   Cash and cash equivalents . . . . . . . . . . .  $ 50,347      $  2,573
   Trade accounts receivable, net. . . . . . . . .    64,015        61,788
   Trade notes receivable, net . . . . . . . . . .    38,065        27,800
   Income taxes receivable . . . . . . . . . . . .        --         2,403
   Inventories . . . . . . . . . . . . . . . . . .   114,790       106,337
   Prepaid expenses. . . . . . . . . . . . . . . .     1,172         1,939
                                                    --------      --------
     Total current assets. . . . . . . . . . . . .   268,389       202,840
Long-term trade notes receivable . . . . . . . . .    35,558        27,003
Deferred income tax asset. . . . . . . . . . . . .     2,232         3,097
Property, plant and equipment, net . . . . . . . .    71,752        78,376
Goodwill, net. . . . . . . . . . . . . . . . . . .    58,478        61,024
Other assets . . . . . . . . . . . . . . . . . . .    26,306        12,318
                                                    --------      --------
                                                    $462,715      $384,658
                                                    --------      --------
                                                    --------      --------

     LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable, principally trade . . . . . .  $ 31,467      $ 13,143
   Accrued expenses. . . . . . . . . . . . . . . .    19,073        18,358
   Current installments of debt. . . . . . . . . .       967           912
   Income taxes payable. . . . . . . . . . . . . .     2,502            --
                                                    --------      --------
     Total current liabilities . . . . . . . . . .    54,009        32,413
Long-term debt . . . . . . . . . . . . . . . . . .    10,270        11,000
Other liabilities. . . . . . . . . . . . . . . . .     1,063         2,631
Stockholders' equity:
   Preferred stock, $.01 par 
     value; authorized 5,000,000 
      shares, none issued. . . . . . . . . . . . .        --            --
   Common stock, $.01 par value; 
     authorized 100,000,000 shares; 
     issued 44,451,293 shares at 
     February 28, 1998 and 43,280,851
     shares at May 31, 1997. . . . . . . . . . . .       445           433
   Additional paid-in capital. . . . . . . . . . .   238,058       218,973
   Retained earnings . . . . . . . . . . . . . . .   162,619       121,116
   Cumulative translation adjustment . . . . . . .    (2,268)       (1,673)
   Unamortized restricted stock compensation . . .    (1,481)         (235)
                                                    --------      --------
     Total stockholders' equity. . . . . . . . . .   397,373       338,614
                                                    --------      --------
                                                    $462,715      $384,658
                                                    --------      --------
                                                    --------      --------

         See accompanying notes to consolidated financial statements.

                                       2



                          INPUT/OUTPUT, INC. AND SUBSIDIARIES

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


                                              FOR THE THREE MONTHS ENDED    FOR THE NINE MONTHS ENDED
                                                     FEBRUARY 28,                 FEBRUARY 28,
                                              --------------------------    ------------------------- 
                                                  1998          1997           1998          1997      
                                                  ----          ----           ----          ----      
                                                                              
Net sales and other revenues . . . . . . . .  $    95,266    $    64,773    $   281,919   $   204,821  
Cost of sales. . . . . . . . . . . . . . . .       54,455         40,887        166,003       130,089
                                              -----------    -----------    -----------   ----------- 
      Gross profit . . . . . . . . . . . . .       40,811         23,886        115,916        74,732
                                              -----------    -----------    -----------   ----------- 
Operating expenses:
  Research and development . . . . . . . . .        8,122          5,641         23,738        17,514
  Marketing and sales. . . . . . . . . . . .        4,160          3,456         10,751        10,322
  General and administrative . . . . . . . .        6,572          4,984         21,082        16,161
  Amortization of intangibles. . . . . . . .        1,628          1,118          4,044         3,340
                                              -----------    -----------    -----------   ----------- 
      Total operating expenses . . . . . . .       20,482         15,199         59,615        47,337
                                              -----------    -----------    -----------   ----------- 
Earnings from operations . . . . . . . . . .       20,329          8,687         56,301        27,395
Interest expense . . . . . . . . . . . . . .         (262)          (296)          (842)         (468)
Other income . . . . . . . . . . . . . . . .        2,204            685          5,576         3,412
                                              -----------    -----------    -----------   ----------- 
Earnings before income taxes . . . . . . . .       22,271          9,076         61,035        30,339
Income taxes . . . . . . . . . . . . . . . .        7,127          2,904         19,532         9,709
                                              -----------    -----------    -----------   ----------- 
Net earnings . . . . . . . . . . . . . . . .  $    15,144    $     6,172    $    41,503   $    20,630
                                              -----------    -----------    -----------   ----------- 
                                              -----------    -----------    -----------   ----------- 
Basic earnings per common share. . . . . . .  $      0.34    $      0.14    $      0.95   $      0.48
                                              -----------    -----------    -----------   ----------- 
                                              -----------    -----------    -----------   ----------- 
Weighted average number of common 
shares outstanding . . . . . . . . . . . . .   44,157,319     43,248,318     43,758,807    43,148,387
                                              -----------    -----------    -----------   ----------- 
                                              -----------    -----------    -----------   ----------- 
Diluted earnings per common share. . . . . .  $      0.34    $      0.14    $      0.94   $      0.47      
                                              -----------    -----------    -----------   ----------- 
                                              -----------    -----------    -----------   ----------- 
Weighted average number of common and
common equivalent shares outstanding . . . .   44,564,745     43,742,770     44,257,576    43,873,227  
                                              -----------    -----------    -----------   ----------- 
                                              -----------    -----------    -----------   ----------- 


               See accompanying notes to consolidated financial statements.

                                       3



                        INPUT/OUTPUT, INC. AND SUBSIDIARIES

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


                                                                   NINE MONTHS ENDED
                                                                      FEBRUARY 28,
                                                                 -------------------- 
                                                                    1998       1997
                                                                    ----       -----
                                                                       
Cash flows from operating activities:
  Net earnings . . . . . . . . . . . . . . . . . . . . . . . . . $ 41,503    $ 20,630
  Adjustments to reconcile net earnings to net cash 
    provided by (used in) operating activities:
     Depreciation and amortization . . . . . . . . . . . . . . .   12,096       8,976
     Amortization of restricted stock compensation . . . . . . .      154         500
     Deferred income taxes . . . . . . . . . . . . . . . . . . .      865         429
     Pension costs . . . . . . . . . . . . . . . . . . . . . . .      277         323
                                                                 --------    -------- 
                                                                   54,895      30,858
     Changes in assets and liabilities:
       Receivables . . . . . . . . . . . . . . . . . . . . . . .  (20,058)    (20,865)
       Inventories . . . . . . . . . . . . . . . . . . . . . . .   (7,944)    (25,122)
       Leased equipment. . . . . . . . . . . . . . . . . . . . .    3,355      (2,362)
       Accounts payable and accrued expenses . . . . . . . . . .   18,016      (4,969)
       Income taxes. . . . . . . . . . . . . . . . . . . . . . .    5,059      (2,726)
       Other . . . . . . . . . . . . . . . . . . . . . . . . . .     (569)       (230)
                                                                 --------    -------- 
       Net cash provided by (used in) operating activities . . .   52,754     (25,416)

Cash flows from investing activities:
  Purchases of property, plant and equipment . . . . . . . . . .   (4,363)    (24,793)
  Acquistion of net assets and business, net of cash acquired. .  (10,803)         --  
  Investment in other assets . . . . . . . . . . . . . . . . . .     (324)     (1,445)
                                                                 --------    -------- 
          Net cash used in investing activities. . . . . . . . .  (15,490)    (26,238)

Cash flows from financing activities:
  Borrowing from bank. . . . . . . . . . . . . . . . . . . . . .       --      20,750
  Payments on debt . . . . . . . . . . . . . . . . . . . . . . .     (675)     (5,921)
  Proceeds from exercise of stock options
    and related tax benefit. . . . . . . . . . . . . . . . . . .   10,857       4,627
  Employee Stock Purchase Plan . . . . . . . . . . . . . . . . .      465          --
                                                                 --------    -------- 
          Net cash provided by financing activities. . . . . . .   10,647      19,456

Effect of foreign currency exchange rates. . . . . . . . . . . .     (137)       (511)
                                                                 --------    -------- 
Net increase (decrease) in cash and cash equivalents . . . . . .   47,774     (32,709)
Cash and cash equivalents at beginning of year . . . . . . . . .    2,573      34,252
                                                                 --------    -------- 
Cash and cash equivalents at end of period . . . . . . . . . . . $ 50,347    $  1,543
                                                                 --------    -------- 
                                                                 --------    -------- 

          See accompanying notes to consolidated financial statements.

                                       4



                     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 for the year ended May 31, 1997, as filed with the Securities 
and Exchange Commission.

(2)  INVENTORIES    

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


                               FEBRUARY 28     May 31,
                                  1998          1997
                               ----------     --------
                                        
Raw materials                   $ 65,982      $ 56,573
Work-in-process                   25,129        23,878
Finished goods                    23,679        25,886
                                --------      --------
                                $114,790      $106,337
                                --------      --------
                                --------      --------


(3)  EARNINGS PER SHARE

     The Company adopted the Financial Accounting Statements Board Statement 
of Financial Accounting Standards No. 128, "Earnings per Share" (SFAS 128) 
during the third quarter of 1998.  In accordance with this new pronouncement, 
basic earnings per share is computed by dividing net earnings available to 
common share holders by the weighted average number of common shares 
outstanding during the period.  Diluted earnings per share is determined on 
the assumption that outstanding dilutive stock options have been exercised 
and the aggregate proceeds as defined were used to reacquire Company common 
stock using the average price of such common stock for the period. Prior 
period earnings per share amounts have been restated in accordance with the 
requirements of the pronouncement.

                                       5


                     INPUT/OUTPUT, INC. AND SUBSIDIARIES
                                       
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS     
                                 (CONTINUED)
                                 (UNAUDITED)

     The following table summarizes the calculation of net earnings and 
weighted average common shares and common equivalent shares outstanding for 
purposes of the computation of earnings per share.


                                                    FOR THE THREE MONTHS ENDED  FOR THE NINE MONTHS ENDED
                                                           FEBRUARY 28,               FEBRUARY 28,
                                                    --------------------------- -------------------------
                                                        1998          1997           1998         1997
                                                     ----------    ----------     ---------     --------
                                                                                  
Net earnings available to common stockholders
(in thousands)                                          $15,144        $6,172       $41,503      $20,630

Weighted average number of common 
shares outstanding                                   44,157,319    43,248,318    43,758,807   43,148,387

Common stock equivalent of stock options                407,426       494,452       498,769      724,840
                                                     ----------    ----------    ----------   ----------

Weighted average number of common shares and
common shares equivalent outstanding                 44,564,745    43,742,770    44,257,576   43,873,227
                                                     ----------    ----------    ----------   ----------
                                                     ----------    ----------    ----------   ----------

Basic earnings per common share                         $  0.34       $  0.14       $  0.95      $  0.48
                                                        -------       -------       -------      -------
                                                        -------       -------       -------      -------

Diluted earnings per common share                       $  0.34       $  0.14       $  0.94      $  0.47
                                                        -------       -------       -------      -------
                                                        -------       -------       -------      -------


(4) 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. Similar 
investments with original maturities beyond three months are considered 
short-term investments available for sale and are carried at fair value. The 
Company does not use or intend to use derivatives. 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 nine months ended
February 28, 1998 and 1997 follow (in thousands):


                                                      1998      1997
                                                     ------    ------
                                                         
Cash paid during the periods for:       

     Interest (net of amount capitalized)            $  892    $  416
     Income taxes                                    $7,947    $9,418


                                       6


                     INPUT/OUTPUT, INC. AND SUBSIDIARIES      

                                          
                 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                 (CONTINUED)
                                 (UNAUDITED)


                                                                 1998     1997
                                                               -------   -----
                                                                   
Non-cash investing and financing activities:
  Restricted stock issued:
     Increase in common stock                                  $     1   $  --
     Increase in paid in capital                                 1,572      --
     Increase in unamortized restricted stock compensation      (1,573)     --
                                                               -------   -----
                                                               $    --   $  --
                                                               -------   -----
                                                               -------   -----

Issuance of common stock in
  connection with business acquisition (320,555 shares):
     Increase in common stock                                  $     3   $  --
     Increase in paid in capital                                 6,372      --
                                                               -------   -----
                                                               $ 6,375   $  --
                                                               -------   -----
                                                               -------   -----


(5)  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 
electronics manufacturing facility.  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.

(6)  RECENT ACCOUNTING PRONOUNCEMENTS

          In June 1997, the Financial Accounting Standards Board issued 
Statement of Financial Accounting Standards No. 130, "Reporting Comprehensive 
Income" (SFAS 130). SFAS 130 establishes standards for reporting and display 
of comprehensive income and its components in a full set of general purpose 
financial statements. The requirements of this statement will be effective 
for both interim and annual periods beginning with the Company's fiscal year 
ending May 31, 1999. Management does not believe that the implementation of 
SFAS 130 will have a material effect on the financial statements.

                                       7


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 third quarter net sales and 
other revenues increased $30.5 million, or 47.1%, to $95.3 million as 
compared to the prior year's third quarter net sales and other revenues of 
$64.8 million. The increase in sales revenues was primarily due to continued 
demand for the Company's land systems and components for expansion of 
existing systems. During the third quarter, six I/O SYSTEM TWO-Registered 
Trademark- land systems and two MSX marine systems were sold, along with 
other seismic data acquisition recording equipment and components for 
expanding existing systems (for a total channel capacity of 25,356 land and 
7,712 marine), compared to the prior year's third quarter sales of eight I/O 
SYSTEM TWO land systems and five MSX marine systems and other recording 
equipment and components (for a total channel capacity of 10,172 land and 
4,288 marine).

     Net sales and other revenues for the first nine months of the current 
year were $281.9 million, up 37.6% from $204.8 million for last year's first 
nine month period, reflecting continued demand for the Company's systems, 
recording equipment and components for expansion of existing systems. Sales 
of 37 I/O SYSTEM TWO land systems and four MSX marine systems (for a total 
channel capacity of 82,872 land and 13,074 marine) were recorded during the 
first nine months of fiscal 1998 compared to 30 I/O SYSTEM TWO land systems 
and eight MSX marine systems (for a total channel capacity of 49,728 land and 
7,232 marine) for the prior year's first nine months.

          GROSS PROFIT MARGIN.  The Company's gross profit margin increased 
for the third quarter and year-to-date compared to the prior year's 
comparable periods, from 36.9% to 42.8%, and 36.5% to 41.1% respectively. 
Continued demand for seismic equipment and instrumentation and the resulting 
sales of land systems and land system expansion components, which typically 
feature higher margins than the Company's marine systems and other equipment, 
were major contributing factors to the improved gross profit margins. The 
Company's gross profit margin for any particular reporting period is 
dependent on the product mix sold and the pricing scheme for the products 
sold for that period and may vary from period to period.

     OPERATING EXPENSES.  Operating expenses increased $5.3 million, or 
34.8%, for the third quarter over the prior year's third quarter operating 
expenses. Research and development expenses increased $2.5 million, or 44.0%, 
compared to the prior year's third quarter, primarily resulting from 
increased development and enhancement efforts, recent acquisitions and 
increased usage of outside engineering services. Marketing and sales expenses 
increased $704,000, or 20.4%, compared to the prior year's third quarter 
primarily due to outside commissions on increased third party sales. General 
and administrative expenses increased $1.6 million, or 31.9%, primarily due 
to an increase in allowance for doubtful accounts resulting from increased 
sales, increased outside services and increased depreciation. Amortization of 
intangibles increased $510,000, or 45.6%, primarily due to increased goodwill 
expense resulting from acquisitions.

     Operating expenses for the first nine months of the current year were 
$12.3 million, or 25.9%, above operating expenses for the first nine months 
of the prior year. Research and development expense increased $6.2 million, 
or 35.5%, compared to the prior year's first nine months, primarily resulting 
from increased development and enhancement efforts, recent acquisitions and 
increased usage of outside engineering services. Marketing and sales expense 
increased $429,000, or 4.2%, compared to the prior year's first nine months. 
General and administrative expenses increased $4.9 million, or 30.4%, 
primarily due to increased compensation expense (mainly attributable to the 
first six months of fiscal 1998) and 

                                       8


increased allowance for doubtful accounts resulting from increased sales. 
Amortization of intangibles increased $704,000, or 21.1%, primarily due to 
increased goodwill expense resulting from acquisitions.

     INTEREST EXPENSE.  As a result of the ten-year term facilities financing 
completed in August 1996, interest expense for the third quarter and the 
first nine months of the current year was $262,000 and $842,000 respectively. 
See "Note (5) - Long-Term Debt" of the Notes to Consolidated Financial 
Statements. Interest expense for  last year's third quarter and first nine 
months was $296,000,and $468,000 respectively, representing interest on this 
facility.

     INCOME TAX EXPENSE.  The Company's effective income tax rate was 
approximately 32%, both for the third quarter and the first nine months of 
1998 and 1997.

LIQUIDITY AND CAPITAL RESOURCES

     GENERAL.  The Company has traditionally financed its operations from 
internally generated cash flow, funds from equity financings and its credit 
facilities. Operating funds flows (which does not consider changes in 
operating assets and liabilities) were $54.9 million for the nine months 
ended February 28, 1998. Cash flows from operating activities were $52.8 
million for the nine months ended February 28, 1998, primarily due to higher 
net earnings and increases in accounts payable and accrued expenses (which 
represented a source of cash) as a result of the increased levels of sales 
and related increases in inventory during fiscal 1998. As of February 28, 
1998 the Company had no borrowings outstanding under its revolving line of 
credit. On February 27, 1998 the Company entered into a new revolving working 
capital facility; see "Credit Agreement" below.

     For the first nine months of 1998, the Company has experienced higher 
levels of cash and cash equivalents (approximately $50.3 million as of 
February 28, 1998) as a result of increased sales during 1998 to date 
compared to the first nine months of 1997 sales. Trade notes receivable 
increased 34.3% compared to May 31, 1997, proportionately with the increased 
level of sales. 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, 1997. Accounts payable 
and accrued expenses at February 28, 1998 were 60.4% higher than at May 31, 
1997, primarily reflecting the increased levels of sales and increase in 
inventory during the first nine months of fiscal 1998. The Company's various 
working capital accounts can vary in amount substantially from period to 
period depending upon the Company's levels of sales, product mix sold, demand 
for its products, percentages of cash versus credit sales, collection rates, 
inventory levels, and general economic and industry factors.

     In August 1996, a subsidiary of the Company borrowed $12.6 million in 
long-term financing secured by the land, buildings and improvements housing 
the Company's executive offices, research and development headquarters and 
electronics 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 
(5) - Long-Term Debt" of the Notes to Consolidated Financial Statements.

     The Company anticipates current year expenditures for exploration and 
development of oil and gas properties to be approximately $2.5 million and 
expects to fund these expenditures from its cash flows from operations. 
However, the Company currently expects that its future level of participation 
in oil and gas drilling activities will be funded primarily by cash flows 
from its productive properties. The Company has drilled one well to date in 
1998, which was a dry hole. The Company expects to participate in up to three 
wells in 1998.

                                       9


     Capital expenditures totaled $15.2 million for the first nine months of 
1998, representing $10.8 million for acquisition of net assets and 
businesses, and $4.4 million for purchases of property, plant and equipment. 
Total capital expenditures are currently expected to aggregate $17.0 million 
for 1998. The Company believes that the combination of its existing working 
capital, unused credit available under its revolving 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.

     CREDIT AGREEMENT.  On February 27, 1998, the Company entered into a 
Credit Agreement with certain lenders, including Bank One, Texas, N.A., as 
administrative agent for the lenders. The credit facility under the Credit 
Agreement replaces the Company's existing revolving working capital line of 
credit. The maximum amount available for borrowings under the Credit 
Agreement is $50 million. In addition, up to $15 million of credit available 
under the Credit Agreement may be used, as needed, by the Company for letters 
of credit. Indebtedness under the Credit Agreement will mature on February 
27, 2001. Borrowings under the Credit Agreement may be made to finance the 
Company's working capital, capital expenditures, acquisitions permitted under 
the Credit Agreement and for general corporate purposes. Outstanding 
indebtedness under the Credit Agreement will bear interest, at the Company's 
option, at fluctuating interest rates based upon a prime rate or a eurodollar 
rate plus a credit margin that fluctuates depending upon the Company's ratio 
of funded debt to capitalization. In addition, the Company must pay a 
commitment fee for unused amounts available under the credit facility, in an 
amount also based upon the Company's ratio of funded debt to capitalization.

     The obligations of the Company under the Credit Agreement are unsecured, 
except for a first lien pledge of the capital stock of certain wholly-owned 
subsidiaries of the Company that the lenders consider to be "material 
subsidiaries". Additionally, certain of these wholly-owned subsidiaries have 
guaranteed the Company's obligations under the Credit Agreement.

     The Credit Agreement contains certain covenants, representations and 
warranties by the Company, including (i) restrictions on liens on the assets 
of the Company and its subsidiaries, (ii) limitations on acquisitions of 
unaffiliated businesses, (iii) limitations on mergers, consolidations and the 
sale of substantially all of the assets of the Company or its subsidiaries, 
and (iv) limitations on indebtedness permitted to be incurred or assumed by 
the Company and its subsidiaries, and certain investments (including 
investments in partnerships and joint ventures) that may be made by the 
Company and its subsidiaries, if such indebtedness or investments would 
result in the failure by the Company to be in compliance with its financial 
ratios and other covenants.

     The Credit Agreement also contains provisions restricting the amount of 
capital expenditures (excluding capital expenditures in connection with 
permitted acquisitions) that the Company and its subsidiaries may make in any 
fiscal year ($30 million for any fiscal year). Further, the Credit Agreement 
requires the Company to maintain and comply with certain financial covenants 
and ratios, including a current ratio, a maximum funded debt to 
capitalization ratio, a fixed charge coverage ratio and a covenant requiring 
that the Company maintain a certain minimum tangible net worth.

     YEAR 2000.  Historically, most computer systems have utilized software 
that processes transactions using two digits to represent the year of the 
transaction (i.e., 97 represents the year 1997). This software needs to be 
modified to properly process dates beyond December 31, 1999 and to avoid 
miscalculation or system failures (the "Year 2000 issue"). The Company is 
currently working to resolve the potential impact of the Year 2000 issue on 
the computerized information systems it utilizes internally and its products 
and customers.

                                      10


     The Company has completed a preliminary assessment of the Year 2000 
issue with respect to the systems and software internally utilized in its 
business enterprise. The Company is in the process of bringing its 
externally-generated information system software into compliance and 
estimates that such software will be fully Year 2000 compliant by mid-1999.

     While the Company has not yet completed its assessment of the Year 2000 
issue with respect to its products and customers, it has formed a focus team 
responsible for this area.  The focus team is in the process of reviewing 
these issues and contacting the Company's suppliers and certain of the 
Company's customers, to assist them in identifying and resolving Year 2000 
issues.  Because its assessment is not yet completed, the Company has not 
yet determined whether it, its customers or its suppliers have any material 
Year 2000 issues, and if so, the potential effects on the Company's 
operations, results of operations or financial condition.

CAUTIONARY STATEMENT FOR PURPOSES OF FORWARD-LOOKING STATEMENTS

     Certain information contained in this Quarterly Report on Form 10-Q 
(including statements contained in this Part I., Item 2. "Management's 
Discussion and Analysis of Results of Operation and Financial Condition" and 
in Part II, Item 1. "Legal Proceedings"), as well as other written and oral 
statements made or incorporated by reference from time to time by the Company 
and its representatives in other reports, filings with the Securities and 
Exchange Commission, press releases, conferences, or otherwise, may be deemed 
to be forward-looking statements within the meaning of Section 21E of the 
Securities Exchange Act of 1934 and are subject to the "Safe Harbor" 
provisions of that section. This information includes, without limitation, 
statements concerning future revenues, future earnings, future costs, future 
margins and future expenses; anticipated product releases and technological 
advances; the future mix of business and future asset recoveries; contingent 
liabilities; Year 2000 issues; the inherent unpredictability of adversarial 
proceedings; and future demand, future industry conditions and trends, future 
capital expenditures, and future financial condition. These statements are 
based on current expectations and involve a number of risks and 
uncertainties, including those set forth below and elsewhere in this 
Quarterly Report. Although the Company believes that the expectations 
reflected in such forward-looking statements are reasonable, it can give no 
assurance that such expectations will prove to be correct.

     When used in this report, the words "anticipate," "estimate," "expect," 
"may," "project" and similar expressions are intended to be among the 
statements that identify forward-looking statements. Important factors which 
could affect the Company's actual results and cause actual results to differ 
materially from those results which might be projected, forecast, estimated 
or budgeted by the Company in such forward-looking statements include, but 
are not limited to, the following: 

                                      11


     RISKS RELATED TO PRODUCTS AND TECHNOLOGICAL CHANGE. The markets for 
the Company's product lines are characterized by rapidly changing technology 
and frequent product introductions.  Whether the Company can develop and 
produce successfully, on a timely basis, new and enhanced products that 
embody new technology, meet evolving industry standards and practice, and 
achieve levels of capability and price that are acceptable to its customers, 
will be significant factors in the Company's ability to compete in the 
future. There can be no assurance that the Company will not encounter 
resource constraints or technical or other difficulties that could delay 
introduction of new products in the future. If the Company is unable, for 
technological or other reasons, to develop competitive products in a timely 
manner in response to changes in the seismic data acquisition industry or 
other technological changes, its business and operating results will be 
materially and adversely affected. In addition, the Company's continuing 
development of new products inherently carries the risk of inventory 
obsolescence with respect to its older products.

     While the Company is currently assessing the potential impact of the 
Year 2000 issue, it has not yet completed its review. The problems actually 
encountered by the Company in addressing its Year 2000 issues may be more 
pervasive than anticipated by management, and if so, could have adverse 
effects on the Company's operations, results of operations or financial 
condition. See "--Liquidity and Capital Resources--Year 2000."

     RISKS RELATED TO TIMING OF PRODUCT SHIPMENTS. Due to the relatively high 
sales price of the Company's products and relatively low unit sales volume, 
the timing in the shipment of systems and the mix of products sold can 
produce fluctuations in quarter-to-quarter financial performance. One of the 
factors which may affect the Company's operating results from time to time is 
that a substantial portion of its net sales and other revenues in any period 
may result from shipments during the latter part of a period. Because the 
Company establishes its sales and operating expense levels based on its 
operational goals, if shipments in any period do not meet goals, revenues and 
net profits may be adversely affected. The Company believes that factors 
which could affect such timing in shipments include, among others, 
seasonality of end-user markets, availability of purchaser financing, 
manufacturing lead times, customer purchases of leased equipment and 
shortages of system components. In addition, because the Company typically 
operates, and expects to continue to operate, without a significant backlog 
of orders for its products, the Company's manufacturing plans and expenditure 
levels are based principally on sales forecasts, which sometimes results in 
inventory excesses and imbalances from time to time.

     RISKS RELATED TO GROSS MARGIN.  The Company's gross margin percentage is 
a function of the product mix sold in any period. Other factors, such as unit 
volumes, inventory obsolescence, heightened price competition, changes in 
sales and distribution channels, shortages in components due to timely 
supplies or ability to obtain items at reasonable prices, and availability of 
skilled labor, may also continue to affect the cost of sales and the 
fluctuation of gross margin percentages in future periods.
     
     UNCERTAINTY OF ENERGY INDUSTRY CONDITIONS.  Demand for the Company's 
products is dependent upon the level of worldwide oil and gas exploration and 
development activity. Such activity in turn is primarily dependent upon oil 
and gas prices, which have been subject to wide fluctuation in recent years 
in response to relatively minor changes in the supply and demand for oil and 
natural gas, market uncertainty and a variety of additional factors that are 
beyond the control of the Company. It is impossible to predict future oil and 
natural gas price movements with any certainty. No assurances can be given as 
to the future level of activity in the oil and gas exploration and 
development industry and its relationship to the future demand for the 
Company's products.

     CREDIT RISK FROM SALES ARRANGEMENTS.  The Company sells to many 
customers on extended-term arrangements. Moreover, in connection with certain 
sales of its systems and equipment, the Company has guaranteed certain loans 
from unaffiliated parties to purchasers of such systems and equipment. In 
addition, the Company has sold contracts and leases to third-party financing 
sources, the terms of which often obligate the Company to repurchase the 
contracts and leases in the event of a customer default or upon certain other 
occurrences. Performance of the Company's obligations under these 
arrangements could have a material adverse effect on the Company's financial 
condition. A number of significant payment defaults 

                                      12


by customers could have a material adverse effect on the Company's financial 
position and results of operations.

     DISRUPTION IN VENDOR SUPPLIES.  The Company's manufacturing process 
requires a high volume of quality components. Certain components used by the 
Company are currently provided by only one vendor. In the future, the Company 
may, from time to time, experience supply or quality control problems with 
its suppliers, and such problems could significantly affect its ability to 
meet production and sales commitments. The Company's reliance on certain 
vendors, as well as industry supply conditions generally, involve several 
risks, including the possibility of a shortage or a lack of availability of 
key components, increases in component costs and reduced control over 
delivery schedules, any of which could adversely affect the Company's future 
financial results.

     RELIANCE ON SIGNIFICANT CUSTOMERS.  A relatively small number of 
customers has accounted for most of the Company's net sales, although the 
degree of sales concentration with any one customer has varied from fiscal 
year to year.  During fiscal 1995, 1996 and 1997 the two largest customers in 
each of those years accounted for 26%, 42% and 45%, respectively, of the 
Company's net sales and other revenues. The loss of any of these customers 
could have a material adverse effect on the Company's sales revenues.
     
     COMPETITION.  The design, manufacture and marketing of seismic data 
acquisition systems is highly competitive and is characterized by continual 
and rapid changes in technology. The Company's principal competitor for land 
seismic equipment is Societe d'Etudes Recherches et Construction 
Electroniques, an affiliate of Compagnie General de Geophysique which, unlike 
the Company, possesses the advantage of being able to sell to an affiliated 
seismic contractor.
     
     Competition in the industry is expected to intensify and could adversely 
affect the Company's future results. Several of the Company's competitors 
have greater name recognition, more extensive engineering, manufacturing and 
marketing capabilities, and greater financial, technological and personnel 
resources than those available to the Company. In addition, certain companies 
in the industry have expanded their product lines or technologies in recent 
years as a result of acquisitions and recent mergers in the oil field 
services industry. There can be no assurance that the Company will be able to 
compete successfully in the future with existing or new competitors. 
Pressures from competitors offering lower-priced products could result in 
future price reductions for the Company's products.

     A continuing trend toward consolidation in the oil field services 
industry may have the effect of adversely affecting the prices and demand for 
the Company's products and services.

     RISK FROM SIGNIFICANT AMOUNT OF FOREIGN SALES.  Sales outside the United 
States have historically accounted for a significant part of the Company's 
net sales and other revenues. Foreign sales are subject to special risks 
inherent in doing business outside of the United States, including the risk 
of war, civil disturbances, embargo and government activities, which may 
disrupt markets and affect operating results. Foreign sales are also 
generally subject to the risks of compliance with additional laws, including 
tariff regulations and import/export restrictions. The Company is, from time 
to time, required to obtain export licenses and there can be no assurance 
that it will not experience difficulty in obtaining such licenses as may be 
required in connection with export sales. 

     Demand for the Company's products from customers in developing countries 
is difficult to predict and can fluctuate significantly from year to year. 
The Company believes that these changes in demand result primarily from the 
instability of economies and governments in certain developing countries, 
changes in internal laws and policies affecting trade and investment, and 
because those markets are only beginning to 

                                      13


adopt new technologies and establish purchasing practices. These risks may 
adversely affect the Company's future operating results and financial 
position. In addition, sales to customers in developing countries on extended 
terms can present heightened credit risks for the Company, for the reasons 
discussed above.

     PROTECTION OF INTELLECTUAL PROPERTY. The Company believes that 
technology is the primary basis of competition in the industry. Although the 
Company currently holds certain intellectual property rights relating to its 
product lines, there can be no assurance that these rights will not be 
challenged by third parties or that the Company will obtain additional 
patents or other intellectual property rights in the future. Additionally, 
there can be no assurance that the Company's efforts to protect its trade 
secrets will be successful or that others will not independently develop 
products similar to the Company's or design around any of the intellectual 
property rights owned by the Company.
     
     DEPENDENCE ON PERSONNEL.  The Company's success depends upon the 
continued contributions of its personnel, many of whom would be difficult to 
replace. The success of the Company will depend on the ability of the Company 
to attract and retain skilled employees. Changes in personnel, therefore, 
could adversely affect operating results.

     RISKS RELATED TO GOVERNMENT REGULATIONS AND PRODUCT CERTIFICATION. The 
Company's operations are also subject to laws, regulations, government 
policies, and product certification requirements worldwide. Changes in such 
laws, regulations, policies, or requirements could affect the demand for the 
Company's products or result in the need to modify products, which may 
involve substantial costs or delays in sales and could have an adverse effect 
on the Company's future operating results.
     
     RISKS OF STOCK VOLATILITY AND ABSENCE OF DIVIDENDS. In recent years, the 
stock market in general and the market for energy and technology stocks in 
particular, including the Company's common stock, have experienced extreme 
price fluctuations. There is a risk that stock price fluctuation could impact 
the Company's operations. Changes in the price of the Company's common stock 
could affect the Company's ability to successfully attract and retain 
qualified personnel or complete desirable business combinations or other 
transactions in the future. The Company has historically not paid cash 
dividends on its capital stock, and there can be no assurances that the 
Company will do so.

     RISKS RELATED TO ACQUISITIONS.  To implement its business plans, the 
Company has relied in part upon acquisitions and may make further 
acquisitions in the future. Acquisitions require significant financial and 
management resources both at the time of the transaction and during the 
process of integrating the newly acquired business into the Company's 
operations. The Company's operating results could be adversely affected if it 
is unable to successfully integrate such new companies into its operations. 
Certain acquisitions or strategic transactions may be subject to approval by 
the other party's board or shareholders, domestic or foreign governmental 
agencies, or other third parties. Accordingly, there is a risk that important 
acquisitions or transactions could fail to be concluded as planned. Future 
acquisitions by the Company could also result in issuances of equity 
securities or the rights associated with the equity securities, which could 
potentially dilute earnings per share. In addition, future acquisitions could 
result in the incurrence of additional debt, taxes, or contingent 
liabilities, and amortization expenses related to goodwill and other 
intangible assets. These factors could adversely affect the Company's future 
operating results and financial position.

     OIL AND GAS OPERATIONS. The Company's oil and gas operations are subject 
to the economic risks typically associated with exploration, development, and 
production activities, including the necessity of significant expenditures to 
drill exploratory wells. In conducting exploration and development 
activities, the 

                                      14


Company may drill unsuccessful wells and experience losses and charges to 
earnings and, if oil or natural gas is discovered, there can be no assurance 
that such oil or natural gas can be economically produced or satisfactorily 
marketed. Historically, the markets for oil and natural gas have been 
volatile and are likely to continue to be volatile in the future. The nature 
of the oil and gas business involves certain operating hazards such as well 
blowouts, cratering, explosions, uncontrollable flows of oil, natural gas or 
well fluids, fires, formations with abnormal pressures, pollution, releases 
of toxic gas and other environmental hazards and risks, any of which could 
result in losses to the Company. While the Company's current practice is not 
to act as operator of any drilling prospect, and while the Company does 
maintain insurance in accordance with customary industry practices under the 
circumstances against some, but not all, of such risks and losses, the 
occurrence of such an event not fully covered by insurance could have a 
material adverse affect on the Company's financial position and results of 
operation.

     The foregoing review of factors pursuant to the Private Securities 
Litigation Reform Act of 1995 should not be construed as exhaustive.  In 
addition to the foregoing, the Company wishes to refer readers to the 
Company's other filings and reports with the Securities and Exchange 
Commission, including its recent reports on Forms 10-K and 10-Q, for a 
further discussion of risks and uncertainties which could cause actual 
results to differ materially from those contained in forward-looking 
statements. The Company undertakes no obligation to publicly release the 
result of any revisions to any such forward-looking statements which may be 
made to reflect the events or circumstances after the date hereof or to 
reflect the occurrence of unanticipated events.

     ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     The Company is not yet required to provide the disclosures required by 
Regulations S-K Item 305 pursuant to General Instruction 1. to Paragraphs 
305(a), 305(b), 305(c), 305(d), and 305(e) of Item 305.

PART II - OTHER INFORMATION.

     ITEM 1.   LEGAL PROCEEDINGS

     On September 24, 1997, a purported class action lawsuit was filed 
against the Company and the former president and chief executive officer, 
and the executive vice president, chief financial officer and secretary 
of the Company, in the U.S. District Court for the Southern District of 
Texas, Houston Division. The action, styled NORMAN TOCK V. INPUT/OUTPUT, 
INC., GARY D. OWENS AND ROBERT P. BRINDLEY, alleges violations of Sections 
10(b) and 20(a) of the Securities Exchange Act of 1934, and state statutory 
and common law fraud provisions. The action was filed on behalf of purchasers 
of common stock of the Company that purchased shares during the period from 
September 17, 1996 through March 18, 1997. The complaint seeks damages in an 
unspecified amount plus costs and attorney's fees. The complaint alleges 
misrepresentations and omissions in public filings and announcements 
concerning the Company's business, sales and products, and disputes certain 
accounting methodologies employed by the Company. On October 21, 1997, a 
stipulation and order was entered by the court, extending the time for 
responses to the complaint by the defendants pending entry of an order 
appointing lead plaintiff and lead counsel. On March 2, 1998 the Court 
entered an order extending the time in which plaintiff may file an amended 
complaint through April 17, 1998. Responses to the amended complaint are due 
on June 8, 1998. The Company believes that the plaintiff's allegations are 
without merit and that there are meritorious defenses to the allegations, and 
intends to defend the action vigorously.

                                      15


     ITEM 2.   CHANGES IN SECURITIES

     During the fiscal quarter ended February 28, 1998, the Company made no 
sales of its equity securities that were not registered under the Securities 
Act of 1993, as amended, except that on February 2, 1998, the Company issued 
in a privately-negotiated transaction, 320,555 shares of its Common Stock in 
connection with the Company's acquisition of CompuSeis, Inc. ("CompuSeis"). 
The Common Stock was issued as partial consideration for such acquisition to 
the former shareholders of CompuSeis in a statutory merger of CompuSeis with 
and into a wholly-owned subsidiary of the Company. The issuance of the Common 
Stock was effected in a transaction exempt from registration pursuant to the 
provisions of Section 4(2) (Rule 506 under Regulation D) of the Securities 
Act of 1933.

     ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K
          
           (a) List of documents filed as Exhibits.
             
               10.1 - Employment Agreement, effective as of January 1, 1998
                      between the Company and W.J. "Zeke" Zeringue.

               10.2 - Credit Agreement dated as of February 27, 1998 among the
                      Company, certain lenders and Banc One, Texas, N.A. as 
                      agent for the lenders.

               27.1 - Financial Data Schedule (included in EDGAR copy only)
               
           (b) Reports on Form 8-K
          
               No reports on form 8-K were filed by the Company during the
               quarter ended February 28, 1998.   

                                      16


                                  SIGNATURE


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: 
                                       -------------------------------------
                                       Ronald A. Harris
                                       Vice President and Controller
                                       (duly authorized officer and
                                       Chief Accounting Officer)

Dated: March 26, 1998

                                      17