NATIONAL INSTRUMENTS CORP /DE/
10-Q, 1998-08-14
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                        SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549

                                     FORM 10-Q

(Mark One)

 X    Quarterly report pursuant to Section 13 or 15(d) of the Securities
      Exchange Act of 1934

For the fiscal quarter ended:  June 30, 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:     0-25426         

                         NATIONAL INSTRUMENTS CORPORATION
              (Exact name of registrant as specified in its charter)

               Delaware                                   74-1871327
- ----------------------------------------     -----------------------------------
    (State or other jurisdiction of                   (I.R.S. Employer
    incorporation or organization)                 Identification Number)
     11500 North MoPac Expressway
             Austin, Texas                                 78759
- ----------------------------------------     -----------------------------------
    (address of principal executive                      (zip code)
               offices)

        Registrant's telephone number, including area code:  (512) 338-9119
                            __________________________

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 __

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest practicable date.

                  Class                       Outstanding at August 12, 1998
     Common Stock - $0.01 par value                     32,841,699

                                     Page 1

<PAGE>

                        NATIONAL INSTRUMENTS CORPORATION


              INDEX

                                                                      Page No.

              PART I.  FINANCIAL INFORMATION

Item 1        Financial Statements:

                 Consolidated Balance Sheets
                 June 30, 1998 (unaudited) and December 31, 1997            3

                 Consolidated Statements of Income (unaudited)
                 Three months and six months ended June 30, 1998 and 1997   4

                 Consolidated Statements of Cash Flows (unaudited)
                 Six months ended June 30, 1998 and 1997                    5

                 Notes to Consolidated Financial Statements                 6

Item 2        Management's Discussion and Analysis of Financial
              Condition and Results of Operations                           9


              PART II.  OTHER INFORMATION

Item 2        Change in Securities                                         18

Item 4        Submission of Matters to a Vote of Security Holders          18

Item 5        Other Information                                            19

Item 6        Exhibits and Reports on Form 8-K                             19

                                     Page 2

<PAGE>

                         PART I - FINANCIAL INFORMATION

ITEM 1.     Financial Statements

                        NATIONAL INSTRUMENTS CORPORATION
                           CONSOLIDATED BALANCE SHEETS
                        (in thousands, except share data)

                                                     June 30,      December 31,
                                                       1998            1997
                                                  --------------  --------------
Assets                                              (unaudited)
Current assets:
   Cash and cash equivalents..................      $  31,678       $  31,943
   Short-term investments.....................         46,886          51,067
   Accounts receivable, net...................         41,070          37,411
   Inventories................................         16,725          15,505
   Prepaid expenses and other current assets..          7,455           5,387
   Deferred income tax, net...................          7,892           7,900
                                                  --------------  --------------
      Total current assets....................        151,706         149,213
Property and equipment, net...................         66,830          46,805
Intangibles and other assets..................          6,624           8,472
                                                  --------------  --------------
      Total assets............................      $ 225,160       $ 204,490
                                                  ==============  ==============

Liabilities and Stockholders' Equity

Current liabilities:
   Current portion of long-term debt..........      $     848       $     851
   Accounts payable...........................         16,738          16,946
   Accrued compensation.......................          8,100           8,219
   Accrued expenses and other liabilities.....          3,056           2,455
   Income taxes payable.......................          6,523           4,871
   Other taxes payable........................          3,149           3,729
                                                  --------------  --------------
      Total current liabilities...............         38,414          37,071
Long-term debt, net of current portion........          4,773           5,151
Deferred income taxes.........................            514             514
                                                  --------------  --------------
      Total liabilities.......................         43,701          42,736
                                                  --------------  --------------
Commitments and contingencies                              --              --
Stockholders' equity:
   Common Stock: par value $.01; 180,000,000
   shares authorized; 32,828,074  and 
   32,656,473 shares issued and outstanding, 
   respectively...............................            328             326
Additional paid-in capital....................         49,164          47,160
Retained earnings.............................        134,244         116,215
Accumulated other comprehensive loss..........         (2,277)         (1,947)
                                                  --------------  --------------
      Total stockholders' equity..............        181,459         161,754
                                                  --------------  --------------
      Total liabilities and stockholders' equity.   $ 225,160       $ 204,490
                                                  ==============  ==============

    The accompanying notes are an integral part of these financial statements.

                                     Page 3

<PAGE>

                        NATIONAL INSTRUMENTS CORPORATION
                        CONSOLIDATED STATEMENTS OF INCOME
                      (in thousands, except per share data)
                                   (unaudited)


                                    Three Months Ended       Six Months Ended
                                          June 30,                June 30,  
                                     1998        1997        1998        1997
                                  ----------  ----------  ----------  ----------

Net sales........................  $ 67,770    $ 60,092   $ 133,123   $ 114,663
Cost of sales....................    16,089      14,009      31,658      26,302
                                  ----------  ----------  ----------  ----------
   Gross profit..................    51,681      46,083     101,465      88,361
                                  ----------  ----------  ----------  ----------
Operating expenses:
   Sales and marketing...........    24,494      21,481      49,024      41,443
   Research and development......     8,953       7,658      16,703      14,135
   General and administrative....     5,201       4,543       9,921       8,813
                                  ----------  ----------  ----------  ----------
      Total operating expenses...    38,648      33,682      75,648      64,391
                                  ----------  ----------  ----------  ----------
      Operating income...........    13,033      12,401      25,817      23,970
Other income (expense):
   Interest income, net..........       762         705       1,432       1,403
   Net foreign exchange loss.....       (67)       (306)       (341)     (1,270)
                                  ----------  ----------  ----------  ----------
      Income before income taxes.    13,728      12,800      26,908      24,103
Provision for income taxes.......     4,530       4,219       8,879       7,954
                                  ----------  ----------  ----------  ----------
      Net income.................  $  9,198       8,581      18,029      16,149
                                  ==========  ==========  ==========  ==========

Basic earnings per share.........  $   0.28        0.26        0.55        0.50
                                  ==========  ==========  ==========  ==========

Weighted average shares          
outstanding-basic................    32,800      32,552      32,800      32,514
                                  ==========  ==========  ==========  ==========

Diluted earnings per share.......  $   0.27        0.26        0.53        0.48
                                  ==========  ==========  ==========  ==========

Weighted average shares          
outstanding-diluted..............    34,200      33,435      34,200      33,435
                                  ==========  ==========  ==========  ==========

    The accompanying notes are an integral part of these financial statements.

                                     Page 4

<PAGE>

                        NATIONAL INSTRUMENTS CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (unaudited)
                                                            Six Months Ended
                                                                June 30,
                                                      --------------------------
                                                          1998          1997
                                                      ------------  ------------
Cash flow from operating activities:
   Net income......................................    $   18,029    $   16,149
   Adjustments to reconcile net income to cash
   provided by operating activities
      Charges to income not requiring cash outlays:
        Depreciation and amortization..............         4,689         4,102
      Changes in operating assets and liabilities:
        Increase in accounts receivable............        (3,728)       (4,749)
        Increase in inventory......................        (1,361)       (1,859)
        Decrease in prepaid expense and other assets          430           187
        Increase in current liabilities............         1,343           582
                                                      ------------  ------------
      Net cash provided by operating activities....        19,402        14,412
                                                      ------------  ------------

Cash flow from investing activities:
   Capital expenditures............................       (23,803)       (5,562)
   Additions to intangibles .......................        (1,432)         (582)
   Purchases of short-term investments.............       (20,398)      (26,719)
   Sales of short-term investments.................        24,578        24,117
                                                      ------------  ------------
      Net cash used in investing activities........       (21,055)       (8,746)
                                                      ------------  ------------

Cash flow from financing activities:
   Repayments of  debt.............................          (431)       (4,187)
   Net proceeds from issuance of common stock......         1,936         1,261
                                                      ------------  ------------
      Net cash provided by (used in)  financing             
      activities...................................         1,505        (2,926)
                                                      ------------  ------------

Effect of translation rate changes on cash.........          (117)         (241)
                                                      ------------  ------------

Net (decrease) increase in cash and cash equivalents         (265)        2,499
Cash and cash equivalents at beginning of period...        31,943        30,211
                                                      ------------  ------------

Cash and cash equivalents at end of period.........    $   31,678    $   32,710
                                                      ============  ============

    The accompanying notes are an integral part of these financial statements.

                                     Page 5

<PAGE>

                        NATIONAL INSTRUMENTS CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1 - Basis of Presentation

The accompanying  unaudited  financial  statements should be read in conjunction
with the consolidated  financial statements and notes thereto for the year ended
December 31, 1997,  included in the Company's  annual report on Form 10-K, filed
with the Securities and Exchange Commission.  In the opinion of management,  the
accompanying   consolidated   financial   statements   reflect  all  adjustments
(consisting  only of normal  recurring  items)  considered  necessary to present
fairly the  financial  position  of  National  Instruments  Corporation  and its
consolidated  subsidiaries  at June 30,  1998 and  December  31,  1997,  and the
results of operations for the three-month  and six-month  periods ended June 30,
1998 and 1997, and the cash flows for the six-month  periods ended June 30, 1998
and 1997. Operating results for the three-month and six-month periods ended June
30, 1998 are not necessarily  indicative of the results that may be expected for
the year ending December 31, 1998.

NOTE 2 - Earnings Per Share

Basic  earnings  per share  (EPS) is  computed  by  dividing  net  income by the
weighted average number of common shares outstanding during each period. Diluted
EPS is computed by dividing net income by the weighted  average number of common
shares and common  share  equivalents  outstanding  (if  dilutive)  during  each
period.  Common share  equivalents  include stock options.  The number of common
share  equivalents  outstanding  relating to stock options is computed using the
treasury stock method.

The  reconciliation  of the  denominators  used to  calculate  the basic EPS and
diluted EPS for the  three-month  and six-month  periods ended June 30, 1998 and
1997 respectively are as follows (in thousands):

                                        Three Months Ended     Six Months Ended
                                             June 30,              June 30, 
                                            (unaudited)           (unaudited)
                                          1998      1997        1998      1997
                                        --------  --------    --------  --------
Weighted average shares                 
outstanding-basic...................     32,800    32,552      32,800    32,514
Plus: Common share equivalents......
   Stock options....................      1,400       883       1,400       921
                                        ========  ========    ========  ========
Weighted average shares                  
outstanding-diluted.................     34,200    33,435      34,200    33,435
                                        ========  ========    ========  ========

Stock options to acquire  907,000 and 1.1 million  shares for the quarters ended
June 30, 1998 and 1997,  respectively,  and 549,000 and 3,000 shares for the six
months  ended June 30,  1998 and 1997,  respectively,  were not  included in the
computations  of diluted  earnings per share because the effect of including the
stock options would have been anti-dilutive.

                                     Page 6

<PAGE>

NOTE 3 - Inventories

Inventories consist of the following (in thousands):
                                                    June 30,       December 31,
                                                      1998            1997     
                                                   (unaudited)
                                                  -------------  ---------------
Raw materials                                      $   8,084      $    6,985
Work-in-process                                          794           1,315
Finished goods                                         7,847           7,205
                                                  -------------  ---------------
                                                   $  16,725      $   15,505
                                                  =============  ===============

NOTE 4 - Comprehensive Income

In June 1997, the FASB issued Statement of Financial Accounting Standards (SFAS)
No. 130, "Reporting  Comprehensive Income." The new standard, which is effective
for  financial  statements  issued for periods  ending after  December 15, 1997,
established  standards for reporting,  in addition to net income,  comprehensive
income and its components  including,  as applicable,  foreign  currency  items,
minimum pension liability adjustments and unrealized gains and losses on certain
investments  in debt and equity  services.  Upon  adoption  the  Company is also
required to reclassify  financial  statements for earlier  periods  provided for
comparative purposes.  The Company adopted this standard in the first quarter of
1998. Total  comprehensive  income for the quarters ended June 30, 1998 and 1997
is $9.0 million and $8.8 million, respectively. For the first six months of 1998
and 1997, comprehensive income is $17.7 million and $15.5 million, respectively.

Reconciliation of accumulated other comprehensive loss (in thousands):

                                Cumulative       Unrealized      Accumulated
                             Foreign Currency   Gain (Loss)         Other
                               Translation           on         Comprehensive
                                Adjustment       Securities          Loss
                            ------------------  -------------  -----------------
Balance at December 31,     $    (2,052)         $     105      $   (1,947)
1997
Current-period change              (260)               (70)           (330)
                            ==================  =============  =================
Balance at June 30, 1998    $    (2,312)         $      35      $   (2,277)
                            ==================  =============  =================

NOTE 5 - Recently Adopted Accounting Requirements

In June 1997,  the FASB issued SFAS No. 131,  "Disclosures  about Segments of an
Enterprise  and Related  Information,"  which the  Company  adopted in the first
quarter of 1998. The statement  establishes  standards for reporting information
about operating  segments in annual financial  statements and requires  selected
information  about  operating  segments in interim  financial  reports issued to
shareholders.  It also  establishes  standards  for  related  disclosures  about
products and services, geographic areas and major customers. Under SFAS No. 131,
operating segments are to be determined  consistent with the way that management
organizes and evaluates  financial  information  internally for making operating
decisions  and  assessing  performance.  The  adoption  of this  new  accounting
standard is not expected to have a material impact on the  consolidated  balance
sheet or statement of income.

In June  1998,  the  FASB  issued  SFAS  No.  133,  "Accounting  for  Derivative
Instruments  and Hedging  Activities,"  which  standardizes  the  accounting for
derivative  instruments,  including certain derivative  instruments  embedded in
other contracts,  by requiring that an entity recognize those items as assets or
liabilities  in the  statement  of  financial  position and measure them at fair
value.  This  statement is effective for all quarters of fiscal years  beginning
after June 15, 1999.  As of June 30, 1998,  the Company is reviewing  the effect
this standard will have on the Company's consolidated financial statements.

                                     Page 7

<PAGE>

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

     This  Quarterly  Report on Form 10-Q  contains  forward-looking  statements
within the meaning of Section 27A of the  Securities Act of 1933 and Section 21E
of the Securities  Exchange Act of 1934.  Actual results could differ materially
from those projected in the  forward-looking  statements as a result of a number
of important  factors.  For a discussion of important  factors that could affect
the  Company's  results,  please  refer to the Issues and  Outlook  section  and
financial statement line item discussions below.  Readers are also encouraged to
refer to the Company's Annual Report on Form 10-K for further  discussion of the
Company's business and the risks and opportunities attendant thereto.

Results of Operations

     The following table sets forth, for the periods  indicated,  the percentage
of  net  sales   represented  by  certain  items   reflected  in  the  Company's
consolidated statements of income:


                                        Three Months Ended     Six Months Ended
                                             June 30,              June 30,
                                        ------------------    ------------------
                                          1998      1997        1998      1997
                                        --------  --------    --------  --------
Net sales:
   North America                          58.8%     60.4%       57.9%     58.5%
   Europe                                 30.5      27.5        29.8      27.5
   Asia Pacific                           10.7      12.1        12.3      14.0
                                        --------  --------    --------  --------
   Consolidated net sales                100.0     100.0       100.0     100.0
Cost of sales                             23.7      23.3        23.8      23.0
                                        --------  --------    --------  --------
   Gross profit                           76.3      76.7        76.2      77.0
                                        --------  --------    --------  --------
Operating expenses:
   Sales and marketing                    36.1      35.8        36.8      36.1
   Research and development               13.2      12.7        12.6      12.3
   General and administrative              7.7       7.6         7.5       7.7
                                        --------  --------    --------  --------
     Total operating expenses             57.0      56.1        56.9      56.1
                                        --------  --------    --------  --------
      Operating income                    19.3      20.6        19.3      20.9
Other income (expense): 
   Interest income, net                    1.1       1.2         1.2       1.2
   Net foreign exchange loss              (0.1)     (0.5)       (0.3)     (1.1)
                                         --------  --------    --------  -------
     Income before income taxes           20.3      21.3        20.2      21.0
Provision for income taxes                 6.7       7.0         6.7       6.9
                                        --------  --------    --------  --------
   Net income                             13.6%     14.3%       13.5%     14.1%
                                        ========  ========    ========  ========

     Net Sales.  Consolidated  net sales  increased by $7.7 million or 12.8% for
the three months ended June 30, 1998 to $67.8 million from $60.1 million for the
three months ended June 30, 1997, and increased $18.4 million or 16.1% to $133.1
million  for the six months  ended June 30,  1998 from  $114.7  million  for the
comparable  period  in the  prior  year.  The  increase  in sales  is  primarily
attributable  to the  introduction  of new and upgraded  products and  increased
sales and marketing efforts.  North American sales in the second quarter of 1998
increased by 9.8% over the second  quarter of 1997 and North  American sales for
the six months  ended June 30, 1998  increased  15.0% from the six months  ended
June 30, 1997. The Company  believes its growth rate for North  American  sales,
9.8% in the second  quarter  compared to 21.0% for the first quarter of 1998, is
attributable  to the effect of economic  difficulties  in Asia on the  Company's
North  American  customers,  particularly  in the automated  test  equipment and
semiconductor  sectors,  and the fact that the number of sales  engineers in the
field actually  decreased  during the first half of the year.  Historically  the
Company  has found a high  correlation  between  revenue and the number of sales
engineers in the field. The Company had 45 engineers in the field as of June 30,
1998 and plans to approach the desired level of 60 by the end of the year.

                                     Page 8

<PAGE>

     International  sales as a percentage of consolidated  sales for the quarter
and six months  ended June 30, 1998  increased  to 41.2% from 39.6% and to 42.1%
from 41.5%, respectively, over the comparable 1997 periods as a result of strong
European  sales.  Compared to 1997, the Company's  European  sales  increased by
25.1% to $20.6 million for the quarter ended June 30, 1998 and by 26.1% to $39.7
million for the six months ended June 30, 1998.  Sales in Asia Pacific  remained
constant at $7.3  million for the quarter  ended June 30, 1998  compared to 1997
and increased  1.8% to $16.3 million from $16.0 million for the six months ended
June 30, 1998 compared to the same period in 1997.  The low sales growth rate in
Asia Pacific was impacted by the economic difficulties  occurring in the region.
The Company  expects  sales  outside of North America to continue to represent a
significant portion of its revenue.  International sales are subject to inherent
risks, including  fluctuations in local economies,  difficulties in staffing and
managing  foreign   operations,   greater  difficulty  in  accounts   receivable
collection,  costs and  risks of  localizing  products  for  foreign  countries,
unexpected changes in regulatory requirements, tariffs and other trade barriers,
difficulties in the repatriation of earnings and the burdens of complying with a
wide variety of foreign laws.

     Sales made by the Company's direct sales offices in Europe and Asia Pacific
are denominated in local currencies,  and accordingly,  the US dollar equivalent
of these sales is affected by changes in the value of the US dollar. Between the
second quarter of 1997 and the second quarter of 1998 the weighted average value
of the US dollar  increased by 6.7%,  causing an  equivalent  decrease in the US
dollar value of the Company's foreign currency sales and expenses. This weighted
average is  calculated  as the  percentage  change in the value of the  currency
relative to the US dollar,  multiplied by the proportion of international  sales
recorded in the  particular  currency.  If the weighted  average value of the US
dollar in the  second  quarter  of 1998 had been the same as that in the  second
quarter of 1997,  the Company's  sales for the second quarter of 1998 would have
been $69.5  million,  a 16% increase.  This effect is 2.6% of  consolidated  net
sales in the aggregate. European sales for the second quarter of 1998 would have
been $21.4  million,  a 29%  increase in second  quarter  1998 sales over second
quarter 1997.  Asia Pacific sales for the second quarter of 1998 would have been
$8.3 million,  a 14% increase in second  quarter 1998 sales over second  quarter
1997 sales. If the weighted  average value of the dollar in the six months ended
June 30, 1998 had been the same as that in the six months  ended June 30,  1997,
the Company's  year-to-date sales would have been $137.1 million, a 20% increase
in year-to-date sales over 1997 sales. Since most of the Company's international
operating expenses are also incurred in local currencies, the change in exchange
rates has the corresponding effect of reducing  consolidated  operating expenses
by $1.1  million  for the six months  ended June 30, 1998 and  $488,000  for the
second  quarter  of 1998.  If the  current  trend in the  value of the US dollar
continues  throughout  1998, it will continue to have the effect of lowering the
US dollar equivalent of international sales and operating expenses.

     Gross Profit. As a percentage of net sales, gross profit decreased to 76.3%
for the second  quarter  of 1998 from  76.7% for the second  quarter of 1997 and
decreased  to  76.2%  for the  first  six  months  of 1998  from  77.0%  for the
comparable  period a year ago.  The lower margin for the second  quarter  ending
June 30,  1998  compared  to prior year  periods is  attributable  to  increased
spending for the third  production  line,  installed  March 1998,  the weaker US
dollar and lower sales growth in the Asia region which has historically provided
higher  margins.  For the six months ended June 30, 1998, the delay in the first
quarter release of the LabVIEW 5.0 and LabWindows CVI products  coupled with the
increased  production spending and lower Asia sales growth, led to lower margins
than the same time last year.  Software  margins have  historically  been higher
than hardware margins.  Therefore,  any change in sales mix resulting in a lower
proportion of software sales produces a lower consolidated gross margin.

     The  marketplace  for the  Company's  products  dictates  that  many of the
Company's  products be shipped quickly after an order is received.  As a result,
the  Company  is  required  to  maintain  significant  inventories.   Therefore,
inventory  obsolescence  is a risk for the Company  due to frequent  engineering
changes,  shifting customer demand,  the emergence of new industry standards and
rapid  technological  advances including the introduction by the Company, or its
competitors,  of products embodying new technology.  While the Company maintains
valuation  allowances for excess and obsolete inventory and management continues
to monitor the adequacy of such valuation allowances,  there can be no assurance
that such valuation allowances will be sufficient.

                                     Page 9

<PAGE>

     Sales and Marketing. Sales and marketing expenses for the second quarter of
1998 increased to $24.5  million,  a 14.0%  increase,  as compared to the second
quarter of 1997,  and increased  18.3% to $49.0 million for the first six months
of 1998 from the comparable 1997 period. As a percentage of net sales, sales and
marketing expenses were 36.1% and 35.8% for the quarters ended June 30, 1998 and
1997,  respectively,  and 36.8% and 36.1% for the six months ended June 30, 1998
and 1997,  respectively.  The  increase in these  expenses  in  absolute  dollar
amounts is primarily attributable to increased advertising, personnel, sales and
marketing  seminars,  tradeshows,  and  other  marketing  activities.  Sales and
marketing personnel increased from 460 at June 30, 1997 to 559 at June 30, 1998.
The Company  expects sales and marketing  expenses in future periods to increase
in absolute  dollars,  and to fluctuate  as a  percentage  of sales based on new
recruiting,  initial and  on-going  marketing  and  advertising  campaign  costs
associated with major new product releases, the opening of new sales offices and
the timing of domestic and international conferences and trade shows.

     Research and Development.  Research and development  expenses  increased to
$9.0 million for the quarter ended June 30, 1998, a 16.9% increase,  as compared
to $7.7 million for the three months ended June 30, 1997, and increased 18.2% to
$16.7  million for the six months ended June 30, 1998 from the  comparable  1997
period.  As a  percentage  of  net  sales,  research  and  development  expenses
represented  13.2% and 12.7% for the second  quarters  ended  June 30,  1998 and
1997,  respectively,  and 12.6% and 12.3% for the six months ended June 30, 1998
and 1997, respectively. The increase in research and development costs is mainly
due to  increases  in  personnel  costs  from  increased  hiring.  Research  and
development  personnel  increased  from 398 at June 30,  1997 to 493 at June 30,
1998. The Company believes that a significant,  on-going  investment in research
and development is required to remain competitive.

     The Company capitalizes  software  development costs in accordance with the
SFAS No. 86,  "Accounting for the Costs of Computer Software to be Sold, Leased,
or  Otherwise  Marketed."  The  Company  amortizes  such costs over the  related
product's estimated economic useful life, generally three years,  beginning when
a product becomes  available for general release.  Amortization  expense totaled
$507,000  and  $361,000  for  the  quarters   ended  June  30,  1998  and  1997,
respectively,  and $922,000  and  $737,000  during the six months ended June 30,
1998  and  1997,  respectively.  Software  development  costs  capitalized  were
$349,000  and  $88,000  for  the   quarters   ended  June  30,  1998  and  1997,
respectively, and $1.1 million and $406,000 for the first six months of 1998 and
1997, respectively.  The amounts capitalized in the second quarter and first six
months of 1998 include LabVIEW 5.0, LabWindows/CVI 5.0 and NI DAQ 6.1.

     General and  Administrative.  General and  administrative  expenses for the
second  quarter  ended June 30, 1998  increased  14.5% to $5.2 million from $4.5
million for the comparable prior year period.  For the first six months of 1998,
general and  administrative  expenses  increased 12.6% to $9.9 million from $8.8
million for the first six months of 1997. As a percentage of net sales,  general
and  administrative  expenses  increased to 7.7% for the quarter  ended June 30,
1998 from 7.6% for the second  quarter  of 1997.  During the first six months of
1998, general and administrative  expenses decreased as a percentage of sales to
7.5% from 7.7% for the comparable prior year period. The decrease in general and
administrative expenses as a percent of sales is due to operational efficiencies
achieved as a result of increased systems integration during the past two years.
The Company's general and  administrative  expense increased in absolute dollars
mainly due to  additional  personnel.  The  Company  expects  that  general  and
administrative  expense in future periods will increase in absolute  amounts and
will fluctuate as a percentage of net sales.

     Interest  Income,  Net. Net interest  income in the second  quarter of 1998
increased to $762,000 from  $705,000 in the second  quarter of 1997 and remained
constant at $1.4 million for the first six months of 1998 and 1997. Net interest
income has  represented  approximately  one percent or less of net sales and has
fluctuated  as a result of investment  balances,  bank  borrowings  and interest
terms thereon.

                                     Page 10

<PAGE>

     Net Foreign  Exchange Loss. Net foreign  exchange losses  recognized in the
second  quarter of 1998 were  $67,000  compared  to $306,000  recognized  in the
second quarter of 1997. Net foreign  exchange losses of $341,000 were recognized
for the first six  months of 1998  compared  to $1.3  million  for the first six
months of 1997.  Foreign exchange gains and losses are attributable to movements
between  the US  dollar  and the  local  currencies  in  countries  in which the
Company's sales  subsidiaries are located.  The decrease in net foreign exchange
losses  recognized  in the  first  half of 1998 is  mainly  due  lower  currency
fluctuations  in the first half of 1998 compared to the first half of 1997.  The
Company  recognizes  the  local  currency  as  the  functional  currency  of its
international subsidiaries.

     The Company utilizes foreign currency forward exchange  contracts against a
majority of its foreign currency-denominated  receivables in order to reduce its
exposure to significant  foreign currency  fluctuations.  The Company  typically
limits the  duration of its forward  contracts to 90 days and does not invest in
contracts for speculative  purposes.  The Company's hedging strategy has reduced
the foreign  exchange losses  recorded by $363,000  during the six-month  period
ended June 30, 1998.

     In December 1997, the Company expanded its foreign currency hedging program
to also  include  foreign  currency  option  contracts  in order to  reduce  its
exposure  related to forecasted net foreign  currency cash flows.  The Company's
policy  allows for the purchase of 5%  "out-of-the-money"  foreign  currency put
option  contracts  with  a  duration  of up to 12  months  for  up to 80% of the
specific  country's  forecasted  net foreign  currency  risk. In June 1998,  the
Company  expanded  its  policy  to allow for the  purchase  of  similar  foreign
currency put option contracts  extending from 12 months to 24 months. The second
quarter 1998 Japanese Yen option contract was exercised at expiration.  The gain
from the sale of this contract had a net effect on operating  income of $97,000.
The Company's  hedging  activities  only partially  address its risks in foreign
currency transactions,  and there can be no assurance that this strategy will be
successful.  If the  US  dollar  continues  to  strengthen,  the  Company  could
experience significant foreign exchange losses due to the foreign exchange risks
that are not addressed by the Company's hedging  strategy.  The Company does not
invest in contracts for speculative purposes.

     Provision  for Income Taxes.  The  provision  for income taxes  reflects an
effective  tax rate of 33% for both the three  months and six months  ended June
30, 1998 and 1997. As of June 30, 1998, eleven of the Company's subsidiaries had
available, for income tax purposes,  foreign net operating loss carryforwards of
approximately  $2.6 million,  of which $1,907,000  expire between 2000 and 2008.
The remaining $674,000 of loss carryforwards may be carried forward indefinitely
to offset future taxable income in the related tax jurisdictions.

Liquidity and Capital Resources

     The Company is currently  financing its  operations  and capital  resources
through cash flow from operations.  Historically,  the Company also financed its
capital  expenditures,  such as the manufacturing  facility constructed in 1995,
through  borrowings from financial  institutions.  At June 30, 1998, the Company
had working capital of  approximately  $113.3 million compared to $112.1 million
at December 31, 1997.

     Accounts receivable  increased to $41.1 million at June 30, 1998 from $37.4
million at December 31, 1997,  as a result of higher  sales  levels.  Days sales
outstanding  decreased  to 55 at June 30, 1998  compared  to 57 at December  31,
1997. Inventory levels increased to $16.7 million from $15.5 million at June 30,
1998 and December 31, 1997,  respectively.  Inventory  turns decreased to 3.8 at
June 30, 1998 compared to turns of 3.9 at December 31, 1997.

                                     Page 11

<PAGE>

     Cash used in the first six months of 1998 for the  purchase of property and
equipment  totaled  $23.8  million  and  for  the   capitalization  of  software
development costs totaled $1.1 million. The Company completed construction of an
office building next to its manufacturing facility in June 1998 which will serve
as the  Company's  new  headquarters.  The  Company has paid  approximately  $26
million in construction  costs as of June 30, 1998 and  approximately $6 million
will be paid during the third  quarter of 1998  resulting in a total cost of $32
million for the new building including furniture,  fixtures and equipment. These
costs will be paid out of the Company's existing working capital and future cash
flows.  The Company  anticipates  the new corporate  headquarters  building will
result  in  additional  quarterly  operating  expenses  in  future  quarters  of
approximately $1.0 million.

     The Company currently expects to fund expenditures for capital requirements
as well as  liquidity  needs  created  by  changes  in  working  capital  from a
combination  of available cash and short-term  investment  balances,  internally
generated  funds,  and  financing   arrangements   with  its  current  financial
institutions.  The Company has a $28.5 million credit agreement with NationsBank
of Texas,  N.A. which consists of (i) an $20.0 million  revolving line of credit
renegotiated  June 30,  1998,  and (ii) an $8.5 million  manufacturing  facility
loan.  As of June 30,  1998,  the  Company  had no  outstanding  balance  on the
revolving  line of credit  and a balance of $5.6  million  on the  manufacturing
facility  loan.  The revolving  line of credit  expires  December 31, 1999.  The
Company's credit agreements contain certain financial covenants and restrictions
as to various  matters.  Borrowings  under the line of credit are secured by the
Company's campus, which includes the land and buildings of the manufacturing and
corporate headquarter site.

     The Company believes that its cash flow from operations,  if any,  existing
cash balances,  short-term  investments and available credit under the Company's
existing credit facilities, will be sufficient to meet its cash requirements for
at least the next twelve months.

Issues and Outlook

     Fluctuations  in  Quarterly  Results.  The  Company's  quarterly  operating
results  have  fluctuated  in the past and may  fluctuate  significantly  in the
future due to a number of  factors,  including:  changes in the mix of  products
sold; the availability and pricing of components from third parties  (especially
sole sources);  the timing of orders;  level of pricing of international  sales;
fluctuations in foreign currency  exchange rates like the recent  devaluation in
certain Asian currencies;  the difficulty in maintaining margins,  including the
higher margins  traditionally  achieved in  international  sales; and changes in
pricing policies by the Company, its competitors or suppliers.  Specifically, if
the Asian currencies  continue to weaken against the US dollar, and if the local
sales prices cannot be raised,  the Company will experience a  deterioration  of
its Asian profit margin. In addition,  the recent economic turmoil in Asia could
continue to have an adverse effect on the Company's  performance as we have seen
in the second quarter of 1998 with zero sales growth in Asia.  Also, the Company
believes the moderate  sales growth rate in North America for the second quarter
is  partially  caused by the effect of  economic  difficulties  in Asia on North
American customers. This effect could result in an increased adverse reaction in
North America in future quarters and could potentially impact Europe as well. In
addition,  decisions  made  by OEMs  to  adjust  their  inventory  levels  could
adversely effect revenues.

     As has  occurred in the past and as may be expected to occur in the future,
new software  products of the Company or new operating  systems of third parties
on which the Company's products are based, often contain bugs or errors that can
result in reduced  sales and/or cause the  Company's  support costs to increase,
either of which could have a material adverse impact on the Company's  operating
results.  Furthermore,  the  Company  serves  a  number  of  industries  such as
automated test equipment, semiconductors, telecommunications, aerospace, defense
and automotive which are cyclical in nature. Downturns in these industries could
have a material adverse effect on the Company's operating results.

                                     Page 12

<PAGE>

     In  recent  years,  the  Company's  revenues  have  been  characterized  by
seasonality,  with revenues  typically being  relatively  constant in the first,
second and third  quarters,  growing in the fourth quarter and being  relatively
flat or declining  from the fourth  quarter of the year to the first  quarter of
the following year. The Company's  results of operations in the third quarter of
1998 may be adversely  affected by lower sales levels in Europe which  typically
occur during the summer  months.  The Company  believes the  seasonality  of its
revenue results from the international mix of its revenue and the variability of
the  budgeting  and  purchasing   cycles  of  its  customers   throughout   each
international  region.  In addition,  total operating  expenses have in the past
tended to be higher  in the  second  and third  quarters  of each  year,  due to
college recruiting and increased intern personnel expenses.  In addition,  third
quarter of 1998 will be impacted  by the new  corporate  headquarters  building,
which will result in additional  quarterly  operating  expenses of approximately
$1.0 million.

     New  Product  Introductions  and  Market  Acceptance.  The  market  for the
Company's  products is characterized  by rapid  technological  change,  evolving
industry  standards,   changes  in  customer  needs  and  frequent  new  product
introductions, and is therefore highly dependent upon timely product innovation.
The  Company's  success is  dependent  in part on its  ability  to  successfully
develop and  introduce  new and  enhanced  products on a timely basis to replace
declining  revenues  from  older  products,  and on  increasing  penetration  in
international  markets.  In the past,  the Company has  experienced  significant
delays between the announcement and the commercial availability of new products.
Any  significant  delay in releasing new products could have a material  adverse
effect on the ultimate success of a product and other related products and could
impede  continued  sales of  predecessor  products,  any of which  could  have a
material  adverse  effect on the Company's  operating  results.  There can be no
assurance  that the Company will be able to introduce new products in accordance
with announced  release dates,  that new products will achieve market acceptance
or that any such acceptance will be sustained for any significant period.  There
can be no assurance  that the  Company's  international  sales will  continue at
existing  levels or grow in accordance  with the  Company's  efforts to increase
foreign market penetration.

     Operation  in  Intensely  Competitive  Markets.  The  markets  in which the
Company  operates  are  characterized  by  intense   competition  from  numerous
competitors, and the Company expects to face further competition from new market
entrants in the future.  A key  competitor is  Hewlett-Packard  Company  ("HP"),
which has been the leading supplier of traditional instrumentation solutions for
decades.  Although HP offers its own line of proprietary instrument controllers,
HP also offers hardware and software  add-on  products for  third-party  desktop
computers and workstations that provide solutions that directly compete with the
Company's virtual instrumentation  products. HP is aggressively  advertising and
marketing products that are competitive with the Company's products.  Because of
HP's strong position in the instrumentation  business,  changes in its marketing
strategy  or  product  offerings  could have a  material  adverse  effect on the
Company operating results.

     The  Company  believes  its  ability to compete  successfully  depends on a
number of factors  both within and outside its control,  including:  new product
introductions by competitors;  product pricing; quality and performance; success
in  developing  new  products;  adequate  manufacturing  capacity  and supply of
components and materials; efficiency of manufacturing operations;  effectiveness
of sales and marketing  resources and strategies;  strategic  relationships with
other suppliers;  timing of new product introductions by the Company; protection
of the  Company's  products by  effective  use of  intellectual  property  laws;
general market and economic  conditions;  and government  actions throughout the
world.  There  can be no  assurance  that the  Company  will be able to  compete
successfully in the future.

     Management  Information  Systems.  The  Company  relies  on  three  primary
regional centers for its management information systems. It is possible that one
or more of the Company's three regional  information  systems could experience a
complete  or  partial  shutdown.  If this  shutdown  occurred  near the end of a
quarter it could impact the Company's  product shipments and revenues as product
distribution  is heavily  dependent  on the  integrated  management  information
systems in each region. Accordingly,  operating results in that quarter would be
adversely  impacted  due to the  shipments  which  would  not  occur  until  the
following period.

                                     Page 13

<PAGE>

     Impact of Year 2000. Many computer  systems  experience  problems  handling
dates beyond the year 1999. Therefore,  some computer hardware and software will
need to be modified prior to the year 2000 in order to remain functional.

     The Company is updating its recent  assessment  of Year 2000  compliance in
its current product  versions.  No assurances can be made that problems will not
arise,  such as customer problems with software  programs,  operating systems or
hardware  that  disrupt  their use of the  Company's  products.  There can be no
assurances that such disruption  would not negatively  impact costs and revenues
in future years.

     The  Company  has  been  assured  by  Oracle  Corporation  that  all of the
Company's  Oracle-based   management  information  systems,  which  include  the
manufacturing,  distribution,  finance,  and order entry systems,  are Year 2000
compliant with the exception of the management  information system in Japan. The
Company  expects to upgrade the  Japanese  system  during the fourth  quarter of
1998.  The Company is in the process of internal  Year 2000 testing of the major
management  information systems as well as assessing additional Year 2000 issues
in its  worldwide  systems.  The  Company  is aware  that its  current  customer
marketing  database and customer  support  software are not Year 2000 compliant.
However,  the Company expects to upgrade both systems prior to Year 2000 as part
of on-going system upgrades.

     The  Company  recently  initiated  formal  communications  with  all of its
significant  suppliers  and vendors to determine the extent to which the Company
is vulnerable to a third party failure to correct Year 2000 issues. There can be
no guarantee that the systems of other companies on which the Company's  systems
rely will be timely converted,  or that a failure to convert by another company,
or a conversion that is incompatible with the Company's systems would not have a
material adverse effect on the Company.

     The Company presently believes that with modifications to existing software
and conversions to new software, the Year 2000 issue can be mitigated. It is not
anticipated  that there will be a  significant  increase in costs as much of the
Year 2000 activities  will be a continuation of the on-going  process to improve
all of the  Company's  systems.  The  Company  plans to  complete  the Year 2000
project by mid 1999.  However,  if such  modifications  and  conversions are not
made,  or are not  completed  timely,  the Year 2000 issue could have a material
impact on the  operations  of the Company.  Specific  factors that might cause a
material  impact  include,  but are not  limited  to,  availability  and cost of
personnel  trained in this area,  the ability to locate and correct all relevant
computer  codes,  failure by third parties to timely convert their systems,  and
similar uncertainties.

     Dependence  on Key  Suppliers.  The Company's  manufacturing  processes use
large volumes of high-quality  components and subassemblies  supplied by outside
sources.  Several of these  components  are  available  through  sole or limited
sources.   Sole-source  components  purchased  by  the  Company  include  custom
application-specific  integrated  circuits  ("ASICs") and other components.  The
Company has in the past  experienced  delays and quality  problems in connection
with sole-source  components,  and there can be no assurance that these problems
will not recur in the future.  Accordingly,  the failure to receive  sole-source
components from suppliers could result in a material  adverse effect on revenues
and results of operations.

     Proprietary  Rights and  Intellectual  Property  Litigation.  The Company's
success depends in part on its ability to obtain and maintain  patents and other
proprietary rights relative to the technologies used in its principal  products.
Despite the Company's  efforts to protect its proprietary  rights,  unauthorized
parties  may have in the past  infringed  or violated  certain of the  Company's
intellectual  property rights.  As is typical in the industry,  the Company from
time  to  time  may  be  notified  that  it  is  infringing  certain  patent  or
intellectual  property  rights of others.  There can be no assurance that patent
litigation  will not  cause  significant  litigation  expense,  liability  and a
diversion of management's  attention which may have a material adverse affect on
results of operations.

                                     Page 14

<PAGE>

     Dependence on Key Management and Technical Personnel. The Company's success
depends to a  significant  degree upon the  continued  contributions  of its key
management,  marketing,  research and development and operational personnel. The
Company  has no  agreements  providing  for  the  employment  of any of its  key
employees for any fixed term and the  Company's  key  employees may  voluntarily
terminate  their  employment  with  the  Company  at any  time.  The loss of the
services of one or more of the  Company's key employees in the future could have
a material  adverse affect on operating  results.  The Company also believes its
future  success will depend in large part upon its ability to attract and retain
additional  highly  skilled  management,   technical,  marketing,  research  and
development,  product  development and operational  personnel with experience in
managing large and rapidly  changing  companies as well as training,  motivating
and  supervising  the employees.  In addition,  the recruiting  environment  for
engineering and other technical  professionals is very competitive.  Competition
for  qualified  software  engineers is  particularly  intense.  The Company also
recruits and employs foreign nationals to achieve its hiring goals primarily for
entry-level  engineering and software positions.  There can be no guarantee that
the Company will continue to be able to recruit foreign nationals to the current
degree if government  requirements for temporary and permanent  residence become
increasingly  restrictive.  These factors further intensify  competition for key
personnel,  and there can be no assurance that the Company will be successful in
retaining its existing key personnel or attracting and retaining  additional key
personnel.  Failure  to  attract  and retain a  sufficient  number of  technical
personnel could have a material adverse effect on the results of operations.

                                     Page 15

<PAGE>

                           PART II - OTHER INFORMATION

ITEM 2.     CHANGE IN SECURITIES

     The  stockholders  of the Company  approved an amendment  to the  Company's
     Certificate of Incorporation to increase the authorized number of shares of
     common stock by  120,000,000  shares to 180,000,000  shares.  The amendment
     became effective on June 19, 1998.

ITEM 4.     SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

      (a)    The annual meeting of stockholders was held on May 12, 1998.

      (b)    The following directors were elected at the meeting to serve a term
             of three years:

                  Dr. James J. Truchard
                  William C. Nowlin, Jr.

            The following directors are continuing to serve their terms:

                  Jeffrey L. Kodosky
                  Dr. Ben G. Streetman
                  L. Wayne Ashby
                  Dr. Donald M. Carlton

      (c)    The  matters voted upon at the  meeting  and  results of the voting
             with respect to those matters were as follows:
                                             For         Instructed  Withheld
                                             ----------  ----------  --------
            (1)   Election of directors:     30,185,179  99          111,504
                     Dr. James Truchard
                     William C. Nowlin, Jr.
<TABLE>
<CAPTION>
                                                                              Broker
                                             For         Against    Abstain   Non-Vote
                                             ----------  ---------  -------   --------
            <S>                              <C>         <C>        <C>       <C>
            (2)   Proposal to approve the    25,963,423  4,313,123  20,236    0
                  amendment to the
                  Company's Certificate of
                  Incorporation to increase
                  the authorized number of
                  shares of common stock by
                  120,000,000 shares to
                  180,000,000 shares.
                                                                              Broker
                                             For         Against    Abstain   Non-Vote
                                             ----------  -------    -------   --------
            (3)   Ratification of Price      30,223,294  66,366     7,122     0
                  Waterhouse LLP as the
                  Company's independent
                  public accountants for
                  the fiscal year ending
                  December 31, 1998.
</TABLE>

     The foregoing  matters are described in detail in the Company's  definitive
     proxy statement dated April 3, 1998, for the Annual Meeting of Stockholders
     held on May 12, 1998.

                                     Page 16

<PAGE>

ITEM 5.     OTHER INFORMATION

     Pursuant to the Company's Bylaws, stockholders who wish to bring matters or
     propose  nominees  for  director at the  Company's  1999 annual  meeting of
     stockholders must provide specified information in writing to the secretary
     of the  Company not less than the thirty (30) days nor more than sixty (60)
     days prior to the first  anniversary  of the 1998 annual  meeting  (May 11,
     1999).

     Stockholders  who wish to bring matters or propose nominees for director at
     the Company's 1999 annual meeting of  stockholders  must provide  specified
     information  in  writing  to the  secretary  of the  Company  no later than
     December 4, 1998,  in order to be included in the proxy  statement and form
     of proxy for that meeting.

ITEM 6.     EXHIBITS AND REPORTS ON FORM 8-K

      (a)    Exhibits.

            (10.1)     Credit Agreement between National Instruments Corporation
                       and NationsBank of Texas, N.A.

            (11.1)     Computation of Earnings Per Share

            (27.1)     Financial Data Schedule

      (b)    Reports on Form 8-K.

             No reports on Form 8-K were filed by the Company during the quarter
             ended June 30, 1998.

                                     Page 17

<PAGE>

                                    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.


                                          NATIONAL INSTRUMENTS CORPORATION
                                          Registrant




                                          BY:   /s/ Alex Davern
                                                Alex Davern
                                                Chief   Financial   Officer  and
                                                Treasurer  (principal  financial
                                                and accounting officer)





Dated:  August 14, 1998

                                     Page 18

<PAGE>

                         NATIONAL INSTRUMENTS CORPORATION

                                 INDEX TO EXHIBITS



      Exhibit No.                   Description                     Page

          10.1           Credit Agreement between National           22
                         Instruments Corporation and
                         NationsBank of Texas, N.A.

          11.1           Statement Regarding Computation             55
                         of Earnings per Share

          27.1           Financial Data Schedule                     56

                                     Page 19


                                LOAN AGREEMENT


     This Loan Agreement  (this  "Agreement")  dated as of June 30, 1998, by and
between NationsBank,  N.A., a national banking association ("Bank") and National
Instruments Corporation, a Delaware corporation ("Borrower").

     In  consideration of the Loans described below and the mutual covenants and
agreements  contained herein, and intending to be legally bound hereby, Bank and
Borrower agree as follows:

     1.  Definitions and Reference Terms. In addition to any other terms defined
herein,  the  following  terms  shall have the  meaning  set forth with  respect
thereto:

          A.  "Advance"  means an advance of the  proceeds of the Line of Credit
     (as defined below) or a portion of the unpaid principal balance of the Term
     Note, as applicable,  subject to the terms, conditions, and requirements of
     this Agreement and the Loans.

          B. "Applicable  Margin" means the interest margin over the LIBOR Rate,
     for  Advances,  which is based on the Senior Debt to EBITDA Ratio as of and
     for the most recent four (4) quarter period ending on or before the date of
     determination,  such Applicable  Margin being set forth opposite such ratio
     below:

                Senior Debt to EBITDA Ratio       Applicable Margin
                ---------------------------       -----------------

                Less than 0.35 to 1.0             0.5% [50 basis points]

                Greater than or equal to          0.65% [65 basis points]
                0.35 to 1.0 but less than or
                equal to 0.75 to 1.0

                Greater than 0.75 to 1.0 but      .75% [75 basis points]
                less than 1.0 to 1.0

                Greater than or equal to          0.95% [95 basis points]
                1.0 to 1.0 but less than
                or equal to 1.25 to 1.0

                Greater than 1.25 to 1            1.15% [115 basis points]

The Senior Debt to EBITDA Ratio shall be  determined  from the then most current
quarterly or annual  financial  statements  of Borrower  and related  compliance
certificate  delivered by Borrower to Bank pursuant to Section  5.B.(iv) of this
Agreement.  The adjustment,  if any, to the Applicable Margin shall be effective
commencing  on the fifth (5th)  Business  Day after  delivery of such  financial
statements (and related compliance  certificate).  If Borrower fails at any time
to furnish to Bank such financial statements and related compliance  certificate
and such failure  continues for more than thirty (30) days after written  notice
of such failure,  then the maximum Applicable Margin shall apply until such time
as such  financial  statements  (and  related  compliance  certificates)  are so
delivered.

          C. "Alternate  Rate" means the sum of a LIBOR Rate plus the Applicable
     Margin per annum.


          D.  "Business  Day"  shall  mean a day on  which  Bank is open for the
     conduct of  substantially  all of its  banking  business  at its  principal
     office in Austin,  Texas and a day on which  dealings are carried on in the
     London interbank market.

          E.   "Continue",   "Continuation",   and  "Continued"   refer  to  the
     continuation  pursuant to Section  3.C.  below of a LIBOR  Advance from one
     LIBOR Interest Period to the next LIBOR Interest Period.

          F.  "Conversion"  and  "Converted"  refer to a conversion  pursuant to
     Section  1(e) below of one type of an  Advance  to another  type of Advance
     (i.e..,  from an  Advance  bearing  interest  at the Prime  Rate to a LIBOR
     Advance, or vice versa).

                                     Page 20

<PAGE>

          G.  "Dollars"  and "$" means U.S.  Dollars,  the  lawful  money of the
     United States of America.

          H. "EBITDA"  means for any period:  (i)  Borrower's  consolidated  net
     income of such period,  determined after deduction of any minority interest
     income, plus (ii) all amounts deducted therefrom during such period, all in
     conformity with GAAP, for interest, taxes, depreciation and amortization.

          I.  "Eurodollar  Reserve  Percentage"  shall mean, for each term of an
     Advance,  the maximum reserve  requirement  including any  supplemental and
     emergency reserves (expressed as a percentage)  applicable during such term
     to member banks of the Federal  Reserve System in respect of  "Eurocurrency
     liabilities"  under  Regulation  D of the Board of Governors of the Federal
     Reserve System,  or such substituted or amended reserve  requirement as may
     be hereafter  applicable to member banks of the Federal  Reserve  System in
     respect  of  such  Eurocurrency   liabilities  or  other  foreign  currency
     liabilities of the nature contemplated by this Agreement.

          J. "Foreign  Currency Advance" shall mean an advance under the Line of
     Credit which is in a foreign currency (that is, not in Dollars).

          K. "Foreign Currency Rate" shall mean, in relation to the term of each
     Foreign Currency Advance, a fixed per annum rate for such term equal to the
     quotient  produced by dividing  (a) the sum of (i) the  percentage  rate of
     interest  determined by Bank at or about 10:00 a.m.  Austin,  Texas time on
     the second  Business Day preceding the anticipated  date of advance,  to be
     the per  annum  rate at  which  deposits  of the type of  foreign  currency
     denominated  during  such term are  offered  to Bank by prime  banks in the
     London foreign currency  deposits market,  at the time of determination and
     in accordance  with the usual practice in such market,  for delivery on the
     first day of such term and for the  number of days  comprised  therein,  in
     amounts  of such  currency  equal (as  nearly  as may be) to the  principal
     amount of the advance,  and (ii) an additional  percentage rate of interest
     not to exceed  one-half of one percent (1/2 of 1%) per annum to  compensate
     Bank  for  making  advances  having  a  Dollar   Equivalent  of  less  than
     $1,000,000.00  each,  by (b) the  remainder  produced  by  subtracting  the
     Eurodollar  Reserve  Percentage  (expressed as a decimal in one  hundredths
     [e.g., 100% = 1.0; 1.0% = .01; etc.]) from 1.0.

          L. "Hazardous Materials" means (i) any "hazardous waste" as defined by
     the Resource  Conservation and Recovery Act of 1976 (42 U.S.C. Section 6901
     et  seq.),  as  amended  from  time to time,  and  regulations  promulgated
     thereunder;  (ii) any "hazardous substance" as defined by the Comprehensive
     Environmental  Response,  Compensation and Liability Act of 1980 (42 U.S.C.
     Section  9601 et seq.)  ("CERCLA"),  as  amended  from  time to  time,  and
     regulations  promulgated  thereunder;  (iii) asbestos; (iv) polychlorinated
     biphenyls;  (v) any  substance  the presence of which on any of  Borrower's
     property is prohibited by any  governmental  authority;  and (vi) any other
     substance which by any governmental  requirement  requires special handling
     in its collection, storage, treatment or disposal.

          M.  "Indebtedness"  means the indebtedness and obligations of Borrower
     to Bank under the Note, the Term Note, this  Agreement,  and any other Loan
     Documents.

          N.  "LIBOR  Rate"  shall  mean an  interest  rate per  annum  (rounded
     upwards,  if  necessary,  to the nearest 1/100 of 1%) appearing on Telerate
     Page 3750 (or any successor page) as the London interbank  offered rate for
     deposits in Dollars at approximately  11:00 a.m. (London time) two Business
     Days prior to the first day of the applicable  LIBOR Interest  Period for a
     term  comparable to such LIBOR  Interest  Period,  as adjusted from time to
     time in Bank's sole discretion,  for the applicable  reserve  requirements,
     deposit insurance  assessment rates, and other regulatory costs. If for any
     reason such rate is not  available,  the term "LIBOR Rate" shall mean,  for
     any LIBOR  Advance for any LIBOR  Interest  Period  therefor,  the rate per
     annum (rounded upwards, if necessary, to the nearest 1/100 of 1%) appearing
     on  Reuters  Screen  LIBO Page as the  London  interbank  offered  rate for
     deposits in Dollars at approximately  11:00 a.m. (London time) two Business
     Days  prior to the  first  day of such  LIBOR  Interest  Period  for a term
     comparable to such LIBOR Interest Period,  as adjusted from time to time in
     Bank's sole discretion,  for the applicable reserve  requirements,  deposit
     insurance assessment rates, and other regulatory costs, provided,  however,
     if more  than one rate is  specified  on  Reuters  Screen  LIBO  Page,  the
     applicable rate shall be the arithmetic mean of all such rates.

                                     Page 21

<PAGE>

          O. "LIBOR  Advance"  shall mean an Advance that bears  interest at the
     Alternate Rate.

          P.  "LIBOR  Interest  Period"  shall  mean with  respect  to any LIBOR
     Advance,  a certain  period  established  by the proper  exercise of a Rate
     Option (as defined  below).  That  certain  period  shall begin on the date
     specified  in the notice that is given to exercise  that Rate  Option,  and
     shall end (a) immediately  before the numerically  corresponding day in the
     first, second, third, sixth, or twelfth calendar month after the month that
     includes such commencement day, or (b) if such first, second, third, sixth,
     or twelfth calendar month has no such numerically  corresponding  day, then
     at the end of the last day of such month.

          Q.  "Loan"  shall mean and  include  any loan  described  in Section 2
     hereof and any  subsequent  loan made by Bank to Borrower which states that
     it is subject to this Agreement,  and any one or more Loans may be referred
     to as the "Loans."
 
          R.  "Loan  Documents"  means  this  Loan  Agreement  and  any  and all
     promissory  notes  executed  by  Borrower  in favor  of Bank and all  other
     documents,  instruments,  guarantees,  certificates and agreements executed
     and/or  delivered by Borrower,  any  guarantor or third party in connection
     with any Loan.

          S. "Maturity Date" means December 31, 1999.

          T. "Maximum  Lawful Rate" means the maximum  lawful  interest rate for
     the Loan and Note, as determined  under Texas law, and shall be the "weekly
     ceiling"  (as  defined in Chapter  303 of the Texas  Finance  Code  [and/or
     Articles 1D.002 and 1D.003 of the Texas Credit Title] and formerly referred
     to as the "Indicated  (Weekly) Ceiling" in Article  1.04(a)(1) of the Texas
     Credit Code [Article 5069-1.04 of VATS]).  Further,  to the extent that any
     other lawful rate ceiling  exceeds the rate ceiling so determined  then the
     higher rate ceiling shall apply.

          U. "Senior Debt" means the Indebtedness and any other  indebtedness of
     Borrower  permitted under this Agreement  which is not  subordinated to the
     Indebtedness.

          V. "Senior Debt to EBITDA Ratio" means,  as of any date,  the ratio of
     (a) the aggregate  amount of Senior Debt of the Borrower,  as of such date,
     to (b) EBITDA of Borrower,  for the four (4) fiscal quarter  periods ending
     on the date of determination.

          W.  "Tangible Net Worth" means the amount by which total assets exceed
     total liabilities in accordance with GAAP.

          X. Accounting Terms. All accounting terms not specifically  defined or
     specified herein shall have the meanings generally attributed to such terms
     under generally accepted accounting  principles ("GAAP"), as in effect from
     time  to  time,   consistently  applied,  with  respect  to  the  financial
     statements referenced in Section 4.H. hereof.

     2. Loans.

          A.  Revolving  Line of  Credit  Loan.  Bank  hereby  agrees  to make a
     revolving  line of credit loan to Borrower in the aggregate  principal face
     amount of  $20,000,000.00  (the "Line of Credit").  The obligation to repay
     the  Line of  Credit  and  all  Advances  thereunder  is  evidenced  by the
     promissory note in the stated  principal  amount of  $20,000,000.00,  dated
     June 30, 1998, executed by Borrower, and payable to the order of Bank, (the
     promissory note or notes together with any and all renewals,  extensions or
     rearrangements  thereof  being  hereafter  collectively  referred to as the
     "Note")  having a maturity date,  repayment  terms and interest rate as set
     forth in the Note.

               i. Revolving  Credit  Feature.  The Loan provides for a revolving
          line of credit  under which  Borrower  may from time to time,  borrow,
          repay and re-borrow funds.

                                     Page 22

<PAGE>

               ii. Letter of Credit  Subfeature.  As a subfeature under the Line
          of Credit, Bank may from time to time up to and including November 30,
          1999,  issue  letters of credit for the account of Borrower  (each,  a
          "Letter of Credit" and collectively,  "Letters of Credit");  provided,
          however, that the form and substance of each Letter of Credit shall be
          subject  to  approval  by Bank in its sole  discretion;  and  provided
          further that the aggregate  undrawn amount of all outstanding  Letters
          of  Credit  shall  not at any time  exceed  the  amount  available  to
          Borrower  under the Line of  Credit.  Each  Letter of Credit  shall be
          issued for a term not to exceed one year,  as  designated by Borrower,
          provided,  however,  that no Letter of Credit shall have an expiration
          date more than ninety days after the Maturity  Date,  unless agreed to
          by Bank (in Bank's sole and absolute  discretion)  at the time of such
          Letter of Credit's issuance.  The pricing and fees for any such Letter
          of Credit  shall be at the  Bank's  standard  rates at the time of the
          issuance of any Letter of Credit. The undrawn amount of all Letters of
          Credit  plus  any and all  amounts  paid  by Bank in  connection  with
          drawings  under any  Letter of Credit  for which the Bank has not been
          reimbursed shall be reserved under the Line of Credit and shall not be
          available  for  advances  thereunder.  Each draft paid by Bank under a
          Letter of Credit  shall be deemed an advance  under the Line of Credit
          and  shall be  repaid  in  accordance  with  the  terms of the Line of
          Credit;  provided however, that if the Line of Credit is not available
          for any reason  whatsoever,  at the time any draft is paid by Bank, or
          if advances are not available  under the Line of Credit in such amount
          due to any  limitation of borrowing  set forth  herein,  then the full
          amount of such drafts shall be immediately  due and payable,  together
          with  interest  thereon,  from the date such amount is paid by Bank to
          the date such  amount is fully  repaid  by  Borrower,  at that rate of
          interest  applicable  to  advances  under the Line of Credit.  In such
          event,  Borrower agrees that Bank, at Bank's sole discretion may debit
          Borrower's deposit account with Bank for the amount of such draft.

          B. Term Loan.  The term loan evidenced by the Real Estate Lien Note in
     the  original  principal  amount of  $8,480,000.00,  dated August 25, 1994,
     executed by  Borrower,  and payable to the order of  NationsBank  of Texas,
     N.A.  (the "Term  Note") shall also be subject to and governed by the terms
     and conditions of this Agreement.  Bank is the owner and holder of the Term
     Note as successor by merger to NationsBank of Texas,  N.A. All  collateral,
     including  without   limitation  the  real  property,   which  secured  the
     indebtedness  evidenced by the Term Note has been or will be released.  The
     Term Note shall be and hereby is  modified  to permit  Borrower  to elect a
     Rate  Option in the manner  and  subject  to the  limitations  set forth in
     Section 3.A-E. hereof. Except to the extent modified by this Agreement, all
     terms of the Term Note continue in full force and effect, without change.

     3. Interest Rate Options; Repayment Provisions for Line of Credit. The Note
shall bear interest as provided in this  Agreement  and the Note.  The principal
balance of the Note from time to time  remaining  unpaid prior to maturity shall
bear interest at a rate per annum (the "Contract  Rate") that is equal to either
the "Prime Rate" or the  "Alternate  Rate",  but in any event never greater than
the "Maximum  Lawful Rate", as those terms are defined in this Agreement and the
Note,  depending on the interest rate option  selected by Borrower in accordance
with this Agreement and the Note.

                                     Page 23

<PAGE>

          A.  Interest  Rate Options The Contract  Rate for each Advance  (other
     than Foreign Currency  Advances) shall be determined in accordance with the
     provisions of this Section 3.A.,  subject to the other terms and conditions
     of this  Agreement  and the  Notes.  The  "Contract  Rate"  shall  mean the
     interest  rate per annum  applicable  to an  Advance as  determined  by the
     provisions of this Agreement.  On any day that is within the LIBOR Interest
     Period for a LIBOR Advance,  the Contract Rate for that LIBOR Advance shall
     equal the lesser of (i) the Alternate Rate for that LIBOR Interest  Period,
     or (ii) the Maximum Lawful Rate;  and, at all times,  the Contract Rate for
     all unpaid principal indebtedness that is not part of a LIBOR Advance shall
     equal the lesser of (i) the Prime Rate, or (ii) the Maximum Lawful Rate. On
     any  Business  Day  that is at  least  two (2)  Business  Days  before  the
     beginning of a LIBOR Interest Period,  Borrower may exercise an option (the
     "Rate  Option")  to  designate   either  (i)  the   outstanding   principal
     indebtedness  or Advance  which is to bear  interest at the Prime Rate,  or
     (ii) the LIBOR  Advance to which a LIBOR  Interest  Period and an Alternate
     Rate shall  apply.  Subject to the  provisions  of Sections  3.B.  and 3.D.
     below,  Borrower may exercise the Rate Option by either (i) giving  written
     notice of such exercise to Bank,  which notice shall identify the principal
     indebtedness,  or Advance,  affected by the Rate Option, the amount of such
     Advance, and, in the case of any LIBOR Advance, the first day of such LIBOR
     Interest  Period and the length of such LIBOR  Interest  Period (one month,
     two months,  three months,  six months, or one year), or (ii) giving notice
     to Bank in any other manner that is  acceptable to Bank. If the Rate Option
     is so exercised and Borrower  elects an Alternate  Rate, then for the LIBOR
     Advance  identified in such notice,  a LIBOR Interest  Period of the length
     specified in that notice shall begin on the date  specified in that notice,
     subject to the terms and conditions of the Note.

          B.  Limitations  on Rate  Options.  Each LIBOR  Advance  must be in an
     amount of $500,000.00 or a greater  integral  multiple of $100,000.00.  Any
     notice that is given to  exercise a Rate  Option  with  respect to the Note
     electing the  Alternate  Rate shall specify  either one month,  two months,
     three  months,  six  months,  or twelve  months as the  length of the LIBOR
     Interest Period established by that exercise.  For purposes of the Note and
     this  Agreement,  a LIBOR  Advance  "matures"  on the last day of the LIBOR
     Interest Period that is applicable to that LIBOR Advance.  Borrower may not
     exercise a Rate Option  electing  the  Alternate  Rate that would  create a
     LIBOR Advance that matures after the Maturity Date.

          C. Continuations; Conversions.

               i. Continuations. Borrower shall have the right to continue LIBOR
          Advances  by  giving  Bank   written   notice   specifying:   (i)  the
          Continuation  date;  (ii)  the  amount  of  the  LIBOR  Advance  to be
          Continued;  and  (iii)  the  duration  of the  LIBOR  Interest  Period
          applicable  thereto,  which  notice shall be  irrevocable  and must be
          given by Borrower  not later than 11:00 a.m.  Austin,  Texas time on a
          Business Day that is at least two (2)  Business  Days before each such
          Continuation.  If  Borrower  shall  fail to give  Bank the  notice  as
          specified above for a continuation of a LIBOR Advance prior to the end
          of the LIBOR Interest Period  applicable  thereto,  such LIBOR Advance
          shall be automatically converted to the Prime Rate.

               ii.  Conversions.  Borrower  shall  have the right to  convert an
          Advance  bearing  interest  at the  Prime  Rate at any time to a LIBOR
          Advance by giving Bank written notice  specifying:  (i) the Conversion
          Date;  (ii) the amount of the Advance to be  Converted;  and (iii) the
          duration of the LIBOR Interest Period applicable thereto, which notice
          shall be  irrevocable  and must be given by Borrower to Bank not later
          than 11:00 a.m. Austin,  Texas time on a Business Day that is at least
          two (2) Business Days before each such Conversion.

After the  occurrence  and during the  continuance  of an Event of  Default,  no
outstanding Advances may be Converted into, or Continued as, a LIBOR Advance.

                                     Page 24

<PAGE>

          D. Special Provisions Regarding the Alternate Rate.

               i. Unavailability.  If Bank determines (which determination shall
          be  presumed  correct  absent  evidence  of  error)  on any  date  for
          determining  the Alternate Rate for any LIBOR Advance,  that by reason
          of any one (1) or more  changes  arising  on or after  the date of the
          Note affecting the interbank eurodollar market,  Dollar deposits in an
          amount  substantially equal to that LIBOR Advance (and/or for a period
          substantially  equal to the relevant  LIBOR  Interest  Period) are not
          generally  available in the London interbank  market,  or adequate and
          fair means do not exist for  ascertaining  the LIBOR Rate on the basis
          provided for herein and in this  Agreement,  then the  Alternate  Rate
          will not be available for that LIBOR Advance and the Contract Rate for
          that Advance shall equal the Prime Rate until Bank  notifies  Borrower
          that such circumstances no longer exist.

               ii.  Increased  Cost. At any time, that Bank shall actually incur
          increased  costs, or reductions in the amounts  received or receivable
          hereunder, with respect to a LIBOR Advance because of any change on or
          after the date of the Note in any applicable law,  governmental  rule,
          regulation,   guideline,   or  order  (or  in  the  interpretation  or
          administration  thereof and including the  introduction of any new law
          or  governmental  rule,  regulation,  guideline or order),  including,
          without   limitation,   the   imposition,   modification,   or  deemed
          applicability  of any reserve,  deposit,  or similar  requirements  as
          related to the  computation  of the LIBOR Rate (such as, for  example,
          but not limited to, a change in official reserve requirements, but, in
          all events,  excluding  reserves  required  under  Regulation D to the
          extent included in the computation of LIBOR Rate); then Borrower shall
          pay to Bank,  on demand,  such  additional  amounts (in the form of an
          increased rate of, or a different  method of calculating,  interest or
          otherwise as Bank  determines in its reasonable  discretion) as may be
          required to compensate  Bank for such increased costs or reductions in
          amounts  receivable  hereunder  (written  notice as to the  additional
          amounts  owed to Bank,  showing  the  basis for  calculation  thereof,
          shall, absent evidence of error, be binding on all parties hereto).

               iii. Illegality.  At any time, that the initiation,  or continued
          use, of the Alternate  Rate as the Contract  Rate has become  unlawful
          under Bank's good faith interpretation of any law,  governmental rule,
          regulation, guideline, or order (or would conflict with any such rule,
          regulation,  guideline  or order not having the force of law),  or has
          become impractical as a result of a contingency  occurring on or after
          the date of this Agreement which materially and adversely  affects the
          interbank  eurodollar market,  then the Alternate Rate shall no longer
          be available  as the Contract  Rate and any exercise by Borrower of an
          option  to have  the  Contract  Rate be the  Alternate  Rate  shall be
          ineffective.

          E. Prime Rate.  The "Prime Rate" is one of the  interest  rate options
     available  to  Borrower  under the Note.  The "Prime  Rate"  means the rate
     established  and  quoted  from time to time by  NationsBank,  N.A.  (or its
     successor)  as its  prime  lending  rate.  If the  Prime  Rate is no longer
     available,  Bank,  in its sole and absolute  discretion,  will choose a new
     index which is based upon  comparable  information.  Regardless of the term
     that may be used from time to time to  describe  such  Prime  Rate (such as
     "base rate" or "prime rate"),  such interest rate does not necessarily mean
     the lowest interest rate charged to other borrowers.  Borrower acknowledges
     that the fluctuations of the Prime Rate may not necessarily correspond with
     future increases or decreases in interest rates charged by other lenders or
     market interest rates in general. Any change in the Contract Rate resulting
     from a change in the level of the Prime  Rate  shall be  effective  without
     notice to Borrower on the same date as the change in the Prime Rate.

          F. Foreign Currency  Advances.  If Borrower requests and Bank accepts,
     Advances  under  the  Line of  Credit  may be made  in a  foreign  currency
     designated  by  Borrower   ("Foreign  Currency   Advances").   The  foreign
     currencies in which it is contemplated  at this time that Foreign  Currency
     Advances may feasibly be made include the following:  Japanese Yen,  French
     Francs,  British  Pounds,  Deutsche  Marks,  Italian  Liras,  Swiss Francs,
     Norwegian Kroners, Swedish Kroners,  Australian Dollars,  Canadian Dollars,
     Dutch Guilders,  Spanish Pesetas,  Danish Kroners,  Belgium Francs, Finnish
     Marks,  Singapore Dollars,  Taiwanese Dollars,  Hong Kong Dollars,  Israeli
     Shekels, Mexican Pesos, Irish Punts, and European Union Euros.

                                     Page 25

<PAGE>

          G.  Interest  Rate on  Foreign  Currency  Advances.  Foreign  Currency
     Advances shall bear interest at a fixed per annum rate equal to the Foreign
     Currency  Rate plus two  percent  (2%) per  annum,  but never to exceed the
     Maximum Lawful Rate.

          H. Repayment. Interest on the Note is payable quarter-annually, at the
     end of each calendar quarter, and the outstanding  principal balance of the
     Note is due and payable on the Maturity Date, except as follows:

               i. LIBOR  Advances.  Interest on each LIBOR  Advance with a LIBOR
          Interest  Period  of 30 or 60 days is due on the last day of the LIBOR
          Interest Period for such LIBOR Advance, without regard to whether such
          LIBOR  Advance is Continued or Converted,  and  otherwise  accrued and
          unpaid  interest on any LIBOR Advance is due and payable  quarterly on
          the  last  day of  each  calendar  quarter,  and  accrued  and  unpaid
          interest,  and  the  principal  amount  of the  LIBOR  Advance  if not
          Continued or Converted pursuant to this Agreement,  is due and payable
          in full on the last day of any LIBOR Interest Period; and

               ii. Foreign Currency Advances.  Interest on each Foreign Currency
          Advance with a term of less than 90 days is due on the last day of the
          term of such Foreign Currency Advance,  without regard to whether such
          term is  extended;  interest on each Foreign  Currency  Advance with a
          term  greater  than 90 days shall be due and payable  quarterly on the
          last day of each  calendar  quarter  during  the term of such  Foreign
          Currency  Advance;  and accrued and unpaid  interest and the principal
          amount of each Foreign  Currency Advance is due on the last day of the
          term of such Foreign  Currency Advance unless such term is extended in
          accordance with the terms of this Agreement.

Repayment of Advances made in Dollars shall be made at Bank's offices in Austin,
Travis  County,  Texas or such other address as may be  designated by Bank,  and
repayment of Foreign  Currency  Advances  shall be made in the foreign  currency
advanced  at a  depository  designated  by Bank in the  country  in  which  such
currency is legal tender during business hours of such designated depository.

          I.  Special  Provisions  Regarding  Foreign  Currency  Advances.  Each
     Foreign  Currency  Advance  requested  by  Borrower  shall be for an amount
     having  a  Dollar  Equivalent  of at least  $50,000.00  and  shall be for a
     limited  term of not less than  thirty  (30) days and not more than one (1)
     year.

          Bank may decline to make a requested  Foreign Currency Advance for any
     reason  which Bank in good faith deems  sound,  in Bank's sole  discretion,
     including  without  limitation  a  determination  by Bank that the Currency
     requested  by  Borrower  is   excessively   volatile,   or  is  not  freely
     transferrable and convertible into Dollars, or that it is impracticable for
     Bank to fund such advance or that the advance risks  illegality or involves
     significant costs not anticipated by Bank. Bank shall not decline to make a
     requested  Foreign  Currency  Advance simply because the requested  advance
     involves  incidental or minor inconvenience or expense. If Bank declines to
     extend  a  requested  Foreign  Currency  Advance,  Borrower  may  obtain  a
     substitute advance in Dollars or, subject to Bank's acceptance, a different
     foreign currency.

          If Bank shall determine that any adverse changes affecting any foreign
     currency  deposit  market or any  applicable  law (whether as a result of a
     change thereof or otherwise) make it  impracticable or unlawful for Bank to
     make  Foreign  Currency  Advances  generally  or  to  make  advances  in  a
     particular  foreign  currency,  then  Bank  may  notify  Borrower  of  such
     determination in writing and Borrower shall not request any further Foreign
     Currency Advances or advances in the particular  foreign  currency,  as the
     case may be,  until  and  unless  Borrower  is  notified  in  writing  of a
     determination by Bank that such advances are again feasible.

          In the event Borrower fails to repay any Foreign  Currency  Advance on
     the last day of the term of such Foreign Currency Advance,  Borrower shall,
     upon  demand by Bank,  pay to Bank,  for the  account of Bank,  all amounts
     reasonably  determined by Bank to be necessary to compensate  Bank for such
     failure,  including  without  limitation  any  losses  incurred  by Bank in
     converting  funds to and/or  from the  foreign  currency  involved,  wiring
     costs, loss of interest or additional interest costs incurred. In the event
     a Foreign  Currency  Advance  is not  repaid on the last day of the term of
     such Foreign Currency Advance and Bank pursues  collection of the same from
     Borrower,  Bank  may,  at its  option,  either  pursue  collection  of such
     delinquent  amount  denomination  in the  foreign  currency  which  was the
     subject of the advance or the Dollar Equivalent of the same,  determined as
     of the date on which Borrower repays the  indebtedness  incurred by Bank in
     order to make such Foreign Currency Advance.

                                     Page 26

<PAGE>

          J.  Prepayment.  Advances  bearing  interest  at the Prime Rate may be
     repaid  in whole or in part at any time  without  penalty  or  premium.  No
     prepayment  of any LIBOR  Advance  or  Foreign  Currency  Advance  shall be
     permitted without the prior written consent of Bank, such consent not to be
     unreasonably  withheld.  Notwithstanding  such  prohibition,  if there is a
     prepayment  of any such LIBOR  Advance,  whether  by  consent  of Bank,  or
     because of acceleration or otherwise, Borrower shall, within 15 days of any
     request by Bank,  pay to Bank any loss or  expense  which Bank may incur or
     sustain as a result of such prepayment. For the purposes of calculating the
     amounts  owed  only,  it shall be  assumed  that  Bank  actually  funded or
     committed to fund the loan through the purchase of an underlying deposit in
     an amount and for a term comparable to the loan, and such  determination by
     Bank shall be conclusive, absent a manifest error in computation.

     4. Representations and Warranties.  Borrower hereby represents and warrants
to Bank as follows:

          A. Good Standing. Borrower is a corporation,  duly organized,  validly
     existing  and in good  standing  under  the  laws of  Delaware  and in good
     standing in the State of Texas and has the power and  authority  to own its
     property  and to  carry  on its  business  in each  jurisdiction  in  which
     Borrower does business.

          B. Authority and Compliance.  Borrower has full power and authority to
     execute  and  deliver  the Loan  Documents  and to incur  and  perform  the
     obligations provided for therein, all of which have been duly authorized by
     all  proper  and  necessary  action of the  appropriate  governing  body of
     Borrower.  No consent or  approval of any public  authority  or other third
     party is required as a condition to the validity of any Loan Document,  and
     Borrower is in  compliance  with all laws and  regulatory  requirements  to
     which it is subject.

          C. Binding  Agreement.  This  Agreement  and the other Loan  Documents
     executed by Borrower  constitute  valid and legally binding  obligations of
     Borrower, enforceable in accordance with their terms.

          D. Litigation.  There is no proceeding  involving Borrower pending or,
     to the knowledge of Borrower,  threatened  before any court or governmental
     authority,  agency or arbitration authority that would materially adversely
     affect  Borrower's  financial  condition,  except as  disclosed  to Bank in
     writing and acknowledged by Bank prior to the date of this Agreement.

          E. No  Conflicting  Agreements.  There  is no  charter,  bylaw,  stock
     provision,  partnership  agreement  or  other  document  pertaining  to the
     organization,  power or  authority  of  Borrower  and no  provision  of any
     existing agreement,  mortgage, indenture or contract binding on Borrower or
     affecting its property, which would conflict with or in any way prevent the
     execution,  delivery or carrying out of the terms of this Agreement and the
     other Loan Documents.

          F. Ownership of Assets. Borrower has good title to its assets, and its
     assets  are free and clear of liens,  except  those  granted to Bank and as
     disclosed to Bank in writing prior to the date of this Agreement.

          G. Taxes.  All taxes and  assessments due and payable by Borrower have
     been paid or are being  contested in good faith by appropriate  proceedings
     and the Borrower has filed all tax returns which it is required to file.

          H.  Financial   Statements.   The  financial  statements  of  Borrower
     heretofore  delivered to Bank have been  prepared in  accordance  with GAAP
     applied on a consistent  basis  throughout  the period  involved and fairly
     present Borrower's financial condition as of the date or dates thereof, and
     there has been no material adverse change in Borrower's financial condition
     or operations  since March 31, 1998. All factual  information  furnished by
     Borrower  to Bank in  connection  with this  Agreement  and the other  Loan
     Documents is and will be accurate and complete on the date as of which such
     information  is delivered to Bank and is not and will not be  incomplete by
     the omission of any material fact  necessary to make such  information  not
     misleading.

          I. Chief  Executive  Office.  Borrower's  chief  executive  office and
     principal place of business is located 11500 N. Mopac  Expressway,  Austin,
     Travis County, Texas, 78759.

                                     Page 27

<PAGE>

          J. Environmental.  Except for Hazardous  Materials,  if any, which are
     used in Borrower's business and are stored,  handled and disposed of in all
     respects in compliance with applicable legal requirements, no real property
     owned by Borrower (i) is currently being used or is intended to be used for
     the storage, transportation,  processing or disposal of Hazardous Materials
     or, to the  knowledge  of Borrower,  has ever been used for such  purposes,
     (ii) is currently being used or is intended to be used or, to the knowledge
     of Borrower, has ever been used in such a way as to create an environmental
     condition that is actionable under applicable laws or regulations, (iii) to
     the  knowledge of Borrower,  contains any Hazardous  Materials,  or (iv) is
     currently  being  operated,  occupied  or used in a manner  which  fails to
     comply  with  all  applicable  health,   safety  and  environmental   laws,
     regulations and ordinances.

          K.  Year  2000.   Borrower   reasonably  believes  that  Borrower  and
     Borrower's  subsidiaries  and affiliates  will be Year 2000 compliant (that
     is, that computer applications, imbedded microchips, and other systems will
     be able to perform date-sensitive functions prior to and after December 31,
     1999) for the  operations  of  Borrower  and  Borrower's  subsidiaries  and
     affiliates on a timely basis except to the extent that a failure to be Year
     2000 compliant  could not  reasonably be expected to have material  adverse
     effect on Borrower's financial condition. Borrower reasonably believes that
     its suppliers and vendors will be Year 2000 compliant  except to the extent
     that  their  failure  to be Year 2000  compliant  could not  reasonably  be
     expected  to  have  a  material  adverse  effect  on  Borrower's  financial
     condition.
 
          L. Continuation of Representations and Warranties. All representations
     and warranties  made under this Agreement shall be deemed to be made at and
     as of the date  hereof and at and as of the date of any  advance  under any
     Loan.

     5.  Affirmative  Covenants.  Until  full  payment  and  performance  of all
obligations of Borrower  under the Loan  Documents,  Borrower will,  unless Bank
consents otherwise in writing (and without limiting any requirement of any other
Loan Document):

          A.  Financial  Condition.  Until  payment  in full of the  Term  Note,
     maintain  Borrower's   financial   condition  as  follows,   determined  in
     accordance  with GAAP applied on a consistent  basis  throughout the period
     involved except to the extent modified by the following definitions:

               i. Maintain Tangible Net Worth of not less than $154,000,000 (the
          "TNW  Requirement")  for each  calendar  quarter;  provided,  however,
          Borrower's  Tangible  Net Worth shall be  maintained  at not less than
          $114,000,000,  provided that any such decrease in the TNW  Requirement
          shall be allowed only if the decrease in Borrower's Tangible Net Worth
          results from intangible assets acquired,  assumed, created, or arising
          from Borrower's  permitted  acquisition of another company or business
          operation or the assets thereof.

          B. Financial  Statements and Other  Information.  Maintain a system of
     accounting  satisfactory  to Bank and in accordance  with GAAP applied on a
     consistent basis throughout the period involved,  permit Bank's officers or
     authorized representatives to visit and inspect Borrower's books of account
     and other records at such reasonable times and as often as Bank may desire,
     after  reasonable  prior  notice  to  Borrower.   Borrower  shall  pay  the
     reasonable  fees and  disbursements  of any  accountants or other agents of
     Bank selected by Bank for the foregoing purposes.  Unless written notice of
     another  location is given to Bank,  Borrower's  books and records  will be
     located at Borrower's chief executive office set forth above. All financial
     statements  called  for  below  shall  be  prepared  in  form  and  content
     acceptable  to  Bank  and  by  independent   certified  public  accountants
     acceptable to Bank. In addition, Borrower will:

               i. Furnish to Bank annual  consolidated  financial  statements of
          Borrower  for each fiscal year of  Borrower,  certified by Borrower as
          true and correct,  within 45 days after Borrower's  filing of its Form
          10-K with the Securities and Exchange Commission (the "SEC").

                                     Page 28

<PAGE>

               ii. Furnish to Bank quarterly  consolidated  financial statements
          (including a balance sheet and profit and loss  statement) of Borrower
          for  each  quarter  of each  fiscal  year of  Borrower,  certified  by
          Borrower as true and correct,  within 45 days after Borrower's  filing
          of its Form 10-Q with the SEC.

               iii. Furnish to Bank a copy of each regular,  periodic or special
          report,  registration  statement, or prospectus filed by Borrower with
          any securities exchange or with the SEC or any successor agency to the
          SEC,  including  without  limitation all Forms 10-K, 10-Q, and 8-K and
          all other periodic  reports  required to be filed under the Securities
          Exchange  Act of  1934  and  the  rules  and  regulations  promulgated
          thereunder.

               iv. If at the end of any  fiscal  quarter  there is  indebtedness
          outstanding  under the Line of Credit (or if  Borrower  has  elected a
          Rate Option with respect to an Advance  under the Term Note),  furnish
          to Bank a compliance  certificate  for (and  executed by an authorized
          representative  of)  Borrower  containing  (a)  a  certification  that
          Borrower is not in default under the terms of this Agreement,  and (b)
          computations and conclusions, in such detail as Bank may request, with
          respect  to  compliance  with  this  Agreement,  and  the  other  Loan
          Documents, including computations of all quantitative covenants.

               v. Furnish to Bank promptly such additional information,  reports
          and  statements  respecting  the  business  operations  and  financial
          condition of Borrower and Borrower's affiliates and subsidiaries, from
          time to time, as Bank may reasonably request.

          C.   Insurance.   Maintain   insurance  for  Borrower  and  Borrower's
     subsidiaries   with  responsible   insurance   companies  on  such  of  its
     properties,  in such  amounts  and  against  such  risks as is  customarily
     maintained  by  similar   businesses   operating  in  the  same   vicinity,
     specifically to include fire and extended coverage  insurance  covering all
     assets, business interruption insurance, workers compensation insurance and
     liability  insurance,  all to be with such companies and in such amounts as
     are satisfactory to Bank and providing for at least 30 days prior notice to
     Bank of any cancellation  thereof.  Satisfactory evidence of such insurance
     will be  supplied  to Bank prior to funding  under the  Loan(s) and 30 days
     prior to each policy renewal.

          D. Existence and Compliance. Maintain its existence, good standing and
     qualification  to do  business,  where  required  and comply with all laws,
     regulations and governmental  requirements  including,  without limitation,
     environmental  laws, health and safety laws, and employment laws (including
     ERISA) which are applicable to Borrower or to any of its property, business
     operations and transactions.

          E. Adverse  Conditions or Events.  Promptly  advise Bank in writing of
     any  condition,  event or act which  comes to its  attention  that would or
     might  materially   adversely  affect  Borrower's  financial  condition  or
     operations or Bank's  rights under the Loan  Documents,  including  without
     limitation (i) any material  litigation filed by or against Borrower,  (ii)
     any material  event that has  occurred  that would  constitute  an event of
     default  under any Loan  Documents,  and (iii) any  uninsured  or partially
     uninsured loss through fire, theft,  liability or property damage in excess
     of an aggregate of $1,000,000.00.

          F. Taxes and Other Obligations.  Pay all of its taxes, assessments and
     other  obligations,  including,  but not  limited to taxes,  costs or other
     expenses  arising  out of this  transaction,  as the  same  become  due and
     payable, except to the extent the same are being contested in good faith by
     appropriate proceedings in a diligent manner.

          G.  Maintenance.  Maintain  all  of  its  tangible  property  in  good
     condition  and  repair and make all  necessary  replacements  thereof,  and
     preserve  and  maintain  all  licenses,  trademarks,  privileges,  permits,
     franchises,  certificates  and the like  necessary for the operation of its
     business.

                                     Page 29

<PAGE>

          H. Environmental.  Defend, indemnify and hold harmless Lender from any
     and  all  liabilities   (including  strict  liability)  actions,   demands,
     penalties,   losses,   costs  or  expenses  (including  without  limitation
     reasonable  attorneys'  fees  and  remedial  costs),  suits,  costs  of any
     settlement  or judgment and claims of any and every kind  whatsoever  which
     may now or in the  future be paid,  incurred  or  suffered  by or  asserted
     against  Lender by any person or entity or  governmental  agency for,  with
     respect  to, or as a direct or  indirect  result  of, the  placement  on or
     under, or the escape,  seepage,  leakage,  spillage,  discharge,  emission,
     release from any property of Borrower of any Hazardous Materials,  or arise
     out of or result from the environmental condition of any of such properties
     or the applicability of any governmental  requirement relating to Hazardous
     Materials (including,  without limitation, CERCLA or any so-called federal,
     state or local  "Superfund" or "Superlien" law, statute,  ordinance,  code,
     rule, regulation order or decree).

          I. Year 2000. Borrower will promptly notify Bank in the event Borrower
     determines  that  any  computer   application  which  is  material  to  the
     operations of Borrower and its subsidiaries will not be Year 2000 compliant
     on a timely  basis,  except to the extent  that non-  compliance  could not
     reasonably  be expected  to have a material  adverse  effect on  Borrower's
     financial condition.

     6.  Negative   Covenants.   Until  full  payment  and  performance  of  all
obligations  of Borrower  under the Note,  Borrower will not,  without the prior
written consent of Bank (and without  limiting any requirement of any other Loan
Documents):

          A. Transfer of Assets or Control. (i) Sell, transfer,  or lease all or
     substantially all of the assets of Borrower,  or (ii) enter into any merger
     or  consolidation  in  which  Borrower  is not the  surviving  entity  upon
     completion of such merger or consolidation.

          B. Liens.  Grant,  suffer or permit any contractual or  noncontractual
     lien on or  security  interest  in its 65.250  acre tract of land,  more or
     less,  out the James  Rogers  Headright  Survey No.  19, in Travis  County,
     Texas, including improvements thereon, except in favor of Bank.

          C.  Extensions of Credit.  Make or permit any  subsidiary to make, any
     loan or advance to any person or entity in excess of  $10,000,000.00 in the
     aggregate.

          D.  Investments.  Make  investments  except for "Permitted  Investment
     Securities."  "Permitted  Investment  Securities" shall mean investments in
     cash,  money market funds,  Government  and Government  Agency  Securities,
     including:  (1)  taxable  investments  in  (i)  U.S.  Government  and  U.S.
     Government   Obligations,   (ii)  Repurchase  Agreements,   (iii)  Domestic
     Certificates  of  Deposit,  Bankers  Acceptances  and Time  Deposits,  (iv)
     Eurodollar  Certificates  of  Deposit  and  Time  Deposits,  (v)  Corporate
     Obligations, Medium Term Notes and Deposit Notes, (vi) Commercial Paper and
     (vii) Auction Rate  Preferreds;  (2) tax-exempt  investments in the form of
     (i) Variable  Rate Demand  Notes,  (ii) Puttable  Bonds,  (iii)  Commercial
     Paper,  (iv)  General  Obligation  &  Revenue  Bonds and (v)  Auction  Rate
     Securities; and (3) foreign currency forward contracts and purchased option
     contracts  specifically  undertaken  for the  purpose  of  hedging  foreign
     currency receivable  exposure.  In order to qualify as Permitted Investment
     Securities,  Commercial Paper must be a2/P2 or better;  taxable instruments
     must be Aa/AA or better;  Municipal  Notes must be Mig2/A-2 or better;  and
     Municipal  Obligations  must be AA or better.  This Section shall in no way
     restrict Borrower's ability to make any acquisition.

          E. Borrowings.  Create,  incur,  assume or become liable in any manner
     for any indebtedness (for borrowed money, deferred payment for the purchase
     of assets, lease payments, as surety or guarantor for the debt for another,
     or otherwise) other than to Bank in excess of $20,000,000 in the aggregate,
     except for normal trade debts incurred in the ordinary course of Borrower's
     business, and except for existing indebtedness disclosed to Bank in writing
     and acknowledged by Bank prior to the date of this Agreement.

                                     Page 30

<PAGE>

          F. Character of Business.  Change the general character of business as
     conducted  at the  date  hereof,  or  engage  in any type of  business  not
     reasonably related to its business as presently conducted.

     7. Default.  Borrower  shall be in default  under this  Agreement and under
each of the other Loan Documents, and an "Event of Default" shall exist, if:

          A. Borrower shall fail to pay any amounts due and owing under the Loan
     or any other Indebtedness  within five (5) business days following the date
     on which the same is due;

          B.  Borrower  should fail to timely and  properly  observe,  keep,  or
     perform any term, covenant,  agreement,  or condition in any Loan Document,
     other than a failure to comply with the  financial  covenants  set forth in
     Section 5.A.i.;

          C. Any  representation  or warranty herein  contained or any financial
     statement,  certificate, report, or opinion submitted to Bank in connection
     with the Loans,  or pursuant  to the  requirements  of the Loan  Documents,
     shall prove to have been  incorrect or misleading  in any material  respect
     when made;

          D.  Borrower  fails to be in compliance  with the  financial  covenant
     contained  in  Section  5 A.  i.,  as of the  end of  two  (2)  consecutive
     quarter-annual accounting periods;

          E. Any  material  judgment  against  Borrower  with respect to a claim
     remains unpaid, not superseded on appeal or unstayed on appeal by agreement
     with the judgment creditor, undischarged, not bonded or not dismissed for a
     period of thirty (30) days;

          F. Borrower makes an assignment for the benefit of creditors,  becomes
     insolvent,  fails generally to pay its debts as they become due,  petitions
     or applies to any tribunal  for the  appointment  of a trustee,  custodian,
     receiver,  (or  similar  official)  of, or for,  Borrower  or of all or any
     substantial part of the assets of Borrower or commences a voluntary case or
     any  other   proceedings   relating  to  Borrower  under  any   bankruptcy,
     reorganization,  compromise arrangement,  insolvency, readjustment of debt,
     dissolution or  liquidation  or similar law (herein called the  "bankruptcy
     law") of any jurisdiction;

          G. Any petition or  application is filed,  or any such  proceeding are
     commenced against Borrower under the bankrupt law of any jurisdiction,  and
     Borrower  by  any  act or  omission  indicates  its  approval,  consent  or
     acquiescence,  or an order for  relief is entered  in an  involuntary  case
     under the federal  bankruptcy laws as now or hereafter  constituted,  or an
     order,  judgment or decree is entered  appointing  any trustee,  custodian,
     receiver,  liquidator or similar  official for Borrower or any  substantial
     part of its assets or  adjudicating  Borrower  bankrupt  or  insolvent,  or
     approving the petition in any such proceedings, and such order, judgment or
     decree remains in effect for sixty (60) days; or

          H.  Borrower  conceals,  removes or permits to be concealed or removed
     any part of its  property,  with  intent to hinder,  delay or  defraud  its
     creditors,  or any of them,  or makes or suffers a  transfer  of any of its
     property  which  may  be  fraudulent   under  any  bankruptcy,   fraudulent
     conveyance  or similar law; or shall have made any transfer of its property
     to or for  the  benefit  of a  creditor  oat a time  when  other  creditors
     similarly situated have not been paid.

     8. Remedies upon  Default.  If an Event of Default shall occur,  Bank shall
have all rights,  powers and remedies available under each of the Loan Documents
as well as all rights and remedies available at law or in equity.

          A.  Notice  and  Opportunity  to Cure.  Prior to  acceleration  of the
     maturity of the Note,  Bank shall give Borrower  written  notice of certain
     Events of Default and provide  Borrower with the  opportunity  to cure such
     Event of Default as set forth in this Section 8.A.

                                    Page 31

<PAGE>

               i. If the Event of Default  is  Borrower's  breach of  subsection
          7.A.  above,  then Bank  shall give  Borrower  notice of such Event of
          Default.  If Borrower  fails to cure such Event of Default  within ten
          (10) days after the day on which notice is actually  given,  then Bank
          may  accelerate  the  maturity  of  the  Note  and  declare  the  Note
          immediately due and payable in full.

               ii. If the Event of Default is  Borrower's  breach of  subsection
          7.B., 7.C.,  7.F., or 7.I above,  then Bank shall give Borrower notice
          of such  Event of  Default.  If  Borrower  fails to cure such Event of
          Default  within  thirty  (30) days  after  the day on which  notice is
          actually  given,   then  Bank  may  accelerate  the  maturity  of  the
          Indebtedness   and  declare  the  Note  and  all  other   Indebtedness
          immediately due and payable in full.

               iv.  As to any  other  Event of  Default  (that  is, a breach  of
          subsection 7.D.,  7.E., 7.G., or 7.H.),  then Bank may, without notice
          to Borrower or any other party now or  hereafter  obligated to pay the
          Indebtedness  or any part  thereof,  accelerate  the  maturity  of the
          Indebtedness   and  declare  the  Note  and  all  other   Indebtedness
          immediately due and payable in full.

Bank's  failure to give  notice of default  upon the  occurrence  of an Event of
Default shall not constitute a waiver of the Event of Default.

          B. Cessation of Advances.  Notwithstanding any other provision herein,
     upon the  occurrence  of an Event of Default,  Bank's  obligations  to make
     further  advances  under  the  Note and this  Agreement  shall  immediately
     terminate without notice of any kind. Bank shall not be obligated to resume
     making  advances under the Note and under this Agreement until such time as
     any such Event of Default is cured.

     9. Notices. All notices, requests or demands which any party is required or
may desire to give to any other party under any provision of this Agreement must
be in writing delivered to the other party at the following address:

            Borrower:               National Instruments Corporation
                                    11500 N. Mopac Expressway, Bldg. B
                                    Austin, Texas 78759
                                    Attn:  Alex Davern
                                    Fax. No. 512.683.6931

            With copy to:           Graves, Dougherty, Hearon & Moody
                                    Post Office Box 98
                                    Austin, Texas  78767
                                    Attn:  Clarke Heidrick, Esq.
                                    Fax:  512.478.1976

            Bank:                   NationsBank, N.A.
                                    501 Congress Avenue (78701)
                                    Post Office Box 908
                                    Austin, Texas 78781
                                    Attn:  Mr. Eric Kosmin
                                    Fax No.: 512.397.2052

or to such other  address as any party may  designate  by written  notice to the
other party. Each such notice,  request and demand shall be deemed given or made
as follows: (a) if sent by mail, upon the earlier of the date of receipt or five
(5) days after deposit in the U.S. Mail, first class postage prepaid;  or (b) if
sent by any other means, upon delivery.

     10.  Costs,  Expenses  and  Attorneys'  Fees.  Borrower  shall  pay to Bank
immediately  upon  demand the full amount of all costs and  expenses,  including
reasonable  attorneys' fees for any outside counsel),  actually incurred by Bank
in connection with (a) negotiation and preparation of this Agreement and each of
the Loan Documents  executed  concurrently  with this  Agreement,  not to exceed
$2,500.00,  and (b) all other  costs and  attorneys'  fees  incurred by Bank for
which  Borrower is obligated to reimburse  Bank in accordance  with the terms of
the Loan Documents.

     11. Miscellaneous. Borrower and Bank further covenant and agree as follows,
without limiting any requirement of any other Loan Document:

                                    Page 32

<PAGE>

          A.  Cumulative  Rights and No Waiver.  Each and every right granted to
     Bank  under any Loan  Document,  or  allowed  it by law or equity  shall be
     cumulative  of each other and may be  exercised  in addition to any and all
     other rights of Bank, and no delay in exercising any right shall operate as
     a waiver thereof,  nor shall any single or partial  exercise by Bank of any
     right preclude any other or future exercise  thereof or the exercise of any
     other right. Borrower expressly waives any presentment,  demand, protest or
     other notice of any kind,  including but not limited to notice of intent to
     accelerate and notice of  acceleration.  No notice to or demand on Borrower
     in any case  shall,  of  itself,  entitle  Borrower  to any other or future
     notice or demand in similar or other circumstances.

          B.  Applicable Law. This Loan Agreement and the Rights and Obligations
     of the Parties  Hereunder Shall Be Deemed to Have Been Made in the State of
     Texas at Bank's  Address  Indicated at the Beginning of this  Agreement and
     Shall Be Governed By, and  Construed in  Accordance  With,  the Laws of the
     State of Texas,  and Is  Performable in the City and County of Texas at the
     Bank's Address Indicated at the Beginning of this Agreement.

          C. Amendment.  No  modification,  consent,  amendment or waiver of any
     provision  of this  Agreement,  nor  consent to any  departure  by Borrower
     therefrom,  shall be  effective  unless the same  shall be in  writing  and
     signed by an  officer  of Bank,  and then  shall be  effective  only in the
     specified  instance and for the purpose for which given.  This Agreement is
     binding  upon  Borrower,  its  successors  and  assigns,  and inures to the
     benefit of Bank,  its  successors  and assigns;  however,  no assignment or
     other transfer of Borrower's rights or obligations  hereunder shall be made
     or be effective without Bank's prior written consent,  nor shall it relieve
     Borrower of any obligations hereunder.  There is no third party beneficiary
     of this Agreement.

          D.  Documents.  All documents,  certificates  and other items required
     under this  Agreement to be executed  and/or  delivered to Bank shall be in
     form and content satisfactory to Bank and its counsel.

          E. Partial  Invalidity.  The  unenforceability  or  invalidity  of any
     provision of this Agreement shall not affect the enforceability or validity
     of any other provision herein and the invalidity or unenforceability of any
     provision  of any Loan  Document  to any person or  circumstance  shall not
     affect the  enforceability or validity of such provision as it may apply to
     other persons or circumstances.

          F. Indemnification. Notwithstanding anything to the contrary contained
     in Section 11(G),  Borrower shall  indemnify,  defend and hold Bank and its
     successors  and  assigns  harmless  from and  against  any and all  claims,
     demands, suits, losses, damages,  assessments,  fines, penalties,  costs or
     other  expenses  (including  reasonable  attorneys'  fees and court  costs)
     arising from or in any way related to any of the transactions  contemplated
     hereby,  including  but not limited to actual or  threatened  damage to the
     environment,  agency costs of  investigation,  personal injury or death, or
     property  damage,  due  to  a  release  or  alleged  release  of  Hazardous
     Materials,  arising from Borrower's business operations, any other property
     owned by Borrower or in the surface or ground water arising from Borrower's
     business operations,  or gaseous emissions arising from Borrower's business
     operations  or any other  condition  existing  or arising  from  Borrower's
     business  operations  resulting  from  the use or  existence  of  Hazardous
     Materials,  whether such claim proves to be true or false. Borrower further
     agrees that its indemnity  obligations  shall include,  but are not limited
     to, liability for damages resulting from the personal injury or death of an
     employee of the  Borrower,  regardless of whether the Borrower has paid the
     employee  under  the  workmen'  s  compensation  laws of any state or other
     similar federal or state  legislation for the protection of employees.  The
     term  "property  damage"  as used in this  paragraph  includes,  but is not
     limited to, damage to any real or personal  property of the  Borrower,  the
     Bank,  and of any third  parties.  The  Borrower's  obligations  under this
     paragraph  shall  survive the repayment of the Loan and any deed in lieu of
     foreclosure  or  foreclosure  of any Deed to  Secure  Debt,  Deed of Trust,
     Security Agreement or Mortgage securing the Loan.

                                    Page 33

<PAGE>

          G.  Survivability.  All  covenants,  agreements,  representations  and
     warranties  made herein or in the other Loan  Documents  shall  survive the
     making of the Loan and shall  continue  in full force and effect so long as
     the Loan is  outstanding or the obligation of the Bank to make any advances
     under the Line shall not have expired.

          H. Amendment,  Restatement,  and Replacement.  This Agreement  amends,
     restates,  and replaces the Amended and Restated Loan Agreement  dated June
     27, 1996, executed by Borrower and NationsBank of Texas, N.A.

     12. NOTICE OF FINAL  AGREEMENT.  This Written Loan  Agreement and the Other
Loan Documents  Represent the Final Agreement Between the Parties and May Not Be
Contradicted by Evidence of Prior, Contemporaneous or Subsequent Oral Agreements
of the Parties. There Are No Unwritten Oral Agreements Between the Parties.

     In Witness  Whereof,  the parties  hereto have caused this  Agreement to be
duly  executed  by their duly  authorized  representatives  as of the date first
above written.

                                    Borrower:

                                    National Instruments Corporation

      [Corporate Seal]

                                    By: /s/ Alex Davern
                                        Alex Davern, Chief Financial Officer

Attest: /s/ David Hugley
        David Hugley, Secretary


                                    Bank:

                                    NationsBank, N.A.
                                    (a national banking association)


                                    By: /s/ Eric Kosmin
                                        Eric Kosmin, Vice President

                                     Page 34

<PAGE>

                                  PROMISSORY NOTE

Date:  June 30, 1998                                                         New
Amount:  $20,000,000.00                         Maturity Date: December 31, 1999

 

Bank:                                     Borrower:

NationsBank, N.A.                         National Instruments Corporation
Banking Center: Austin                    11500 N. Mopac Expressway
11th Floor, NationsBank Tower             Austin, Texas 75759
515 Congress Avenue                       (Travis County)
Austin, Texas 78701
(Travis County)
                                          (Name and street address,
(Street address including county)         including  county)
========================================= ======================================


     For Value Received,  the undersigned Borrower  unconditionally (and jointly
and  severally,  if more than  one)  promises  to pay to the order of Bank,  its
successors  and  assigns,  without  setoff,  at  its  offices  indicated  at the
beginning of this Note, or at such other place as may be designated by Bank, the
principal  amount of Twenty Million and 00/100 Dollars  ($20,000,000.00),  or so
much  thereof  as may be  advanced  from time to time in  immediately  available
funds,  together  with  interest  computed  daily on the  outstanding  principal
balance  hereunder,  at an annual  interest  rate,  and in  accordance  with the
payment schedule, indicated below.

     This  Note is  executed  pursuant  to and  shall  be  governed  by the Loan
Agreement dated June 30, 1998, executed by Borrower and Bank (as the same may be
modified,  amended,  and  restated  from time to time,  the  "Loan  Agreement").
Defined terms used in this Note and otherwise not defined  herein shall have the
meaning given such terms in the Loan  Agreement.  The Loan  Agreement sets forth
certain rights and obligations of the parties and certain provisions  concerning
this Note, such as (without limitation) events of default, notice of default and
opportunity to cure default.  To the extent,  if any, that the Loan Agreement is
inconsistent with this Note, the Loan Agreement shall control.

     1. Rate.  This Note and all Advances under this Note and the Loan Agreement
shall bear  interest  at one or more  rates per annum,  as set forth in the Loan
Agreement,  reference  to which is hereby  made for all  purposes.  Each  Dollar
Advance shall bear interest at the applicable  Contract Rate for such Advance as
determined by a properly  exercised Rate Option.  Each Foreign  Currency Advance
shall bear  interest at the  applicable  Foreign  Currency Rate for such Foreign
Currency Advance.

     Notwithstanding any provision of this Note or the Loan Agreement, Bank does
not intend to charge and  Borrower  shall not be  required  to pay any amount of
interest or other charges in excess of the maximum  permitted by applicable  law
(the "Maximum  Lawful Rate").  Borrower agrees that during the full term hereof,
the maximum  lawful  interest rate for this Note as  determined  under Texas law
shall be the "Weekly  Ceiling"  (as defined in Chapter 303 of the Texas  Finance
Code [and/or  Articles 1D.002 and 1D.003 of the Texas Credit Title] and formerly
referred to as the  "Indicated  (Weekly)  Ceiling" in Article  1.04(a)(1) of the
Texas Credit Code [Article 5069-1.04 of VATS]).  Further, to the extent that any
other lawful rate ceiling exceeds the rate ceiling so determined then the higher
rate  ceiling  shall  apply.  Any  payment  in excess of such  maximum  shall be
refunded to Borrower or credited against principal, at the option of Bank.

     2. Accrual Method.  Unless  otherwise  indicated,  interest at the Rate set
forth  above and in the Loan  Agreement  will be  calculated  by the 365/360 day
method (a daily  amount of interest is computed for a  hypothetical  year of 360
days;  that  amount is  multiplied  by the  actual  number of days for which any
principal is outstanding hereunder).  Provided, however, interest at the Maximum
Lawful Rate shall be  calculated  based on the actual number of days in the year
(365 or 366, as the case may be).

                                    Page 35

<PAGE>

     3. Rate Change  Date.  Any Rate based on a  fluctuating  index or base rate
will change,  unless otherwise  provided,  each time and as of the date that the
index or base rate changes.  In the event any index is discontinued,  Bank shall
substitute an index determined by Bank to be comparable, in its sole discretion.

     4. Payment Schedule. All payments received hereunder shall be applied first
to the payment of any expense or charges  payable  hereunder  or under any other
loan documents  executed in connection  with this Note, then to interest due and
payable,  with the balance applied to principal,  or in such other order as Bank
shall determine at its option.

          (a) Interest shall be due and payable quarterly as it accrues,  on the
     last day of each  calendar  quarter,  beginning  September  30,  1998,  and
     continuing  on the last calendar day of each  December,  March,  June,  and
     September of each year during the term of this Note,  through and including
     September 30, 1999.

          (b) The  outstanding  principal  balance  and all  accrued  and unpaid
     interest shall be due and payable in full on December 31, 1999.

The foregoing notwithstanding,  all LIBOR Advances and Foreign Currency Advances
shall be due and payable as set forth in the Loan Agreement.

     5. Revolving Feature.  Borrower may borrow, repay and reborrow hereunder at
any time, up to a maximum aggregate amount  outstanding at any one time equal to
the  principal  amount of this Note,  provided  that  Borrower is not in default
under any  provision of this Note,  any other  documents  executed in connection
with this  Note,  or any other  note or other loan  documents  now or  hereafter
executed in  connection  with any other  obligation  of  Borrower  to Bank,  and
provided that the borrowings hereunder do not exceed any borrowing base or other
limitation  on  borrowings  by Borrower.  Bank shall incur no liability  for its
refusal to advance  funds based upon its  determination  that any  conditions of
such further  advances have not been met.  Bank records of the amounts  borrowed
from  time  to time  and  kept in the  ordinary  course  of  business  shall  be
conclusive proof thereof.

     6.  Waivers,  Consents  and  Covenants.  Except  as  provided  in the  Loan
Agreement, Borrower, any indorser or guarantor hereof, or any other party hereto
(individually an "Obligor" and collectively "Obligors") and each of them jointly
and severally:  (a) waive all notices,  demands for payment,  presentations  for
payment,  notices of intention to accelerate  the maturity,  notice of maturity,
protest  and notice of  protest,  as to this Note and as to each,  every and all
installments  hereof; (b) consent to all delays,  extensions,  renewals or other
modifications of this Note or the Loan Documents,  or waivers of any term hereof
or of the Loan Documents, or release or discharge by Bank of any of Obligors, or
release, substitution or exchange of any security for the payment hereof, or the
failure to act on the part of Bank,  or any  indulgence  shown by Bank  (without
notice to or  further  assent  from any of  Obligors),  and  agree  that no such
action,  failure to act or failure to exercise any right or remedy by Bank shall
in any way affect or impair the obligations of any Obligors or be construed as a
waiver by Bank of, or otherwise  affect,  any of Bank's  rights under this Note,
under  any  indorsement  or  guaranty  of this  Note or  under  any of the  Loan
Documents; and (c) agree to pay, on demand, all costs and expenses of collection
or defense of this Note or of any  indorsement  or  guaranty  hereof  and/or the
enforcement or defense of Bank's rights with respect to, or the  administration,
supervision,  preservation,  or protection of, or realization upon, any property
securing payment hereof,  including,  without limitation,  reasonable attorney's
fees, including fees related to any suit,  mediation or arbitration  proceeding,
out of court payment agreement,  trial, appeal,  bankruptcy proceedings or other
proceeding,  in such amount as may be determined reasonable by any arbitrator or
court, whichever is applicable.

     7.  Prepayments.  Prepayments  may only be made subject to the terms of the
Loan  Agreement.  All  prepayments of principal  shall be applied in the inverse
order of  maturity,  or in such other order as Bank shall  determine in its sole
discretion.

                                    Page 36

<PAGE>

     8. Remedies upon Default.  Whenever there is an Event of Default under this
Note,  subject to the provisions for notice and cure in the Loan Agreement,  (a)
Bank  shall  have all  rights  and  remedies  available  under  each of the Loan
Documents,  as well as all rights and  remedies  available  at law or in equity,
and/or (b) to the extent  permitted  by law,  the Rate of interest on the unpaid
principal shall be increased at Bank's discretion up to the Maximum Lawful Rate,
or if none,  25% per annum (the "Default  Rate").  The  provisions  herein for a
Default Rate shall not be deemed to extend the time for any payment hereunder or
to constitute a "grace  period"  giving  Obligors a right to cure any default if
the same is not provided under the Loan Agreement. At Bank's option, any accrued
and unpaid interest, fees or charges may, for purposes of computing and accruing
interest  on a daily  basis  after  the due date of the Note or any  installment
thereof,  be deemed to be a part of the principal  balance,  and interest  shall
accrue on a daily  compounded basis after such date at the Default Rate provided
in this Note until the entire  outstanding  balance of principal and interest is
paid in full. Upon a default under this Note,  Bank is hereby  authorized at any
time, at its option and without notice or demand,  to set off and charge against
any  deposit  accounts  of any  Obligor  (as  well  as any  money,  instruments,
securities,  documents,  chattel paper, credits, claims, demands, income and any
other  property,  rights and interests of any Obligor),  which at any time shall
come into the  possession  or custody or under the control of Bank or any of its
agents, affiliates or correspondents, any and all obligations due hereunder.

     9.  Non-Waiver.  The  failure  at any time of Bank to  exercise  any of its
options or any other rights hereunder shall not constitute a waiver thereof, nor
shall it be a bar to the  exercise  of any of its  options  or rights at a later
date.  All rights and  remedies of Bank shall be  cumulative  and may be pursued
singly,  successively or together, at the option of Bank. The acceptance by Bank
of any partial payment shall not constitute a waiver of any default or of any of
Bank's rights under this Note. No waiver of any of its rights hereunder,  and no
modification  or  amendment  of this  Note,  shall be  deemed to be made by Bank
unless the same shall be in writing,  duly  signed on behalf of Bank;  each such
waiver  shall apply only with  respect to the specific  instance  involved,  and
shall in no way impair the rights of Bank or the obligations of Obligors to Bank
in any other respect at any other time.

     10. Applicable Law, Venue and Jurisdiction.  Borrower Agrees That this Note
Shall Be  Deemed  to Have  Been  Made in the  State of Texas at  Bank's  Address
Indicated at the  Beginning of this Note and Shall Be Governed By, and Construed
in Accordance  With,  the Laws of the State of Texas and Is  Performable  in the
City and  County  of Texas  Indicated  at the  Beginning  of this  Note.  In any
litigation  in  connection  with or to enforce this Note or any  indorsement  or
guaranty  of this  Note or any  Loan  Documents,  Obligors,  and  each of  them,
irrevocably  consent to and confer  personal  jurisdiction  on the courts of the
State of Texas or the United  States courts  located  within the State of Texas.
Nothing contained herein shall,  however,  prevent Bank from bringing any action
or  exercising  any  rights  within  any  other  state or  jurisdiction  or from
obtaining  personal  jurisdiction by any other means available under  applicable
law.

     11. Partial Invalidity. The unenforceability or invalidity of any provision
of this Note  shall not  affect  the  enforceability  or  validity  of any other
provision herein and the invalidity or unenforceability of any provision of this
Note or of the Loan Documents to any person or circumstance shall not affect the
enforceability or validity of such provision as it may apply to other persons or
circumstances.

     12.  Binding  Effect.  This  Note  shall be  binding  upon and inure to the
benefit of Borrower, Obligors and Bank and their respective successors, assigns,
heirs and personal  representatives,  provided,  however, that no obligations of
Borrower or Obligors  hereunder can be assigned without prior written consent of
Bank.

                                    Page 37

<PAGE>

Borrower  represents  to Bank  that  the  proceeds  of this  loan are to be used
primarily  for  business,   commercial  or   agricultural   purposes.   Borrower
acknowledges  having read and  understood,  and agrees to be bound by, all terms
and conditions of this Note.

NOTICE OF FINAL  AGREEMENT:  This Written  Promissory  Note Represents the Final
Agreement Between the Parties, and May Not Be Contradicted by Evidence of Prior,
Contemporaneous,  or Subsequent  Oral  Agreements  of the Parties.  There Are No
Unwritten Oral Agreements Between the Parties.

                                      Borrower:

                                      National Instruments Corporation
                                      (a Delaware corporation)



                                      By: /s/ Alex Davern
                                          Alex Davern, Chief Financial Officer

Bank:

NationsBank, N.A.



By: /s/ Eric Kosmin
    Eric Kosmin, Vice President

                                    Page 38

<PAGE>

                             NEGATIVE PLEDGE AGREEMENT


     This Negative Pledge Agreement (this  "Agreement")  dated June 30, 1998, by
and between NationsBank, N.A. (the "Bank") and National Instruments Corporation,
a Delaware corporation (the "Borrower");

     Whereas,  Borrower  desires to obtain a loan  (together with all extensions
and  renewals  thereof  hereafter  referred  to as the  "Loan") in the amount of
$20,000,000.00  from  Bank,  which  Loan  shall be  governed  by the  terms  and
conditions of the Loan Agreement of even date herewith, executed by Borrower and
Bank (as the same may be modified,  amended,  and/or restated from time to time,
the "Loan Agreement"); and

     Whereas,  Bank is willing to grant the Loan provided Borrower agrees not to
encumber certain real property owned by Borrower;

     Now, Therefore,  for and in consideration of the Loan made or to be made by
Bank to Borrower, and for other good and valuable consideration, the receipt and
sufficiency  of which is hereby  acknowledged  by both  Borrower  and Bank,  the
parties hereto do agree as follows:

     1. Property  Borrower  hereby  agrees that,  for so long as any part of the
Loan (as defined in the Loan Agreement) remains  outstanding and/or Bank has any
obligation  to make  advances  under the Loan,  that it will not,  without first
obtaining  the prior  written  consent  of Bank,  grant,  suffer,  or permit any
contractual or noncontractual  lien on or security interest in the real property
owned by Borrower and described as follows:  65.250 acres of land, more or less,
out of the James Rogers  Headright  Survey No. 19, in Travis County,  Texas, and
being a portion of those two certain  tracts of land  conveyed to  International
Business Machines Corporation by deeds recorded in Volume 3235, Page 386, and in
Volume 3235, Page 393, of the Deed Records of Travis County,  Texas; said 65.250
acre tract being more particularly  described by metes and bounds in Exhibit "A"
attached hereto and  incorporated  herein (the "Real  Property"),  including any
improvements constructed thereon, except in favor of Bank.

     2.  Recording.  Bank is  hereby  authorized  and  permitted  to cause  this
instrument (or a copy hereof) to be recorded at such times and at such places as
Bank, at its option, may elect.

     3. Termination.  This Agreement shall remain in full force and effect until
the Loan  described  above  shall  have been paid in full and Bank shall have no
further commitment to lend thereunder.

     4. Conflicting  Provisions.  To the extent, if any, that the Loan Agreement
is inconsistent with this Agreement, the Loan Agreement shall control.

     5.  Miscellaneous.  This  Agreement  shall be binding upon and inure to the
benefit of  Borrower  and Bank and their  respective  successors  and  permitted
assigns.  This Agreement is not intended to confer on any person other than Bank
and Borrower and their successors and permitted assigns any rights, obligations,
remedies,  or liabilities.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Texas and the laws of the United States
of America applicable to transactions in Texas. In case any of the provisions of
this  Agreement  shall  for  any  reason  be  held to be  invalid,  illegal,  or
unenforceable, such invalidity, illegality, or unenforceability shall not affect
any other  provision  hereof,  and this Agreement  shall be construed as if such
invalid,  illegal,  or unenforceable  provision had never been contained herein.
This  Agreement  may be  executed in any number of  counterparts,  each of which
shall be deemed an original,  but all of which taken together  shall  constitute
one and the same instrument.

                                    Page 39

<PAGE>

Notice of Final Agreement: this Written Negative Pledge Agreement Represents the
Final  Agreement  Between the Parties and May Not Be Contradicted by Evidence of
Prior,  Contemporaneous or Subsequent Oral Agreements of the Parties.  There Are
No Unwritten Oral Agreements Between the Parties.

     In Witness  Whereof,  the parties  hereto have caused this  Agreement to be
executed by their duly authorized representatives.

                                      Borrower:

                                      National Instruments Corporation
                                      (a Delaware corporation)


                                      By: /s/ Alex Davern
                                          Alex Davern, Chief Financial Officer

                                      Bank:

                                      NationsBank, N.A.
                                      (a national banking association)


                                      By: /s/ Eric Kosmin
                                          Eric Kosmin, Vice President


STATE OF TEXAS

COUNTY OF TRAVIS

     This instrument was acknowledged  before me this 23rd day of July, 1998, by
Alex Davern,  Chief Financial  Officer of National  Instruments  Corporation,  a
Delaware corporation, on behalf of said corporation.


                                      /s/ Debra L. Kirchner
                                      Notary Public - State of Texas

                                    Page 40
<PAGE>

STATE OF TEXAS

COUNTY OF TRAVIS

     This instrument was acknowledged  before me this 23rd day of July, 1998, by
Eric  Kosmin,   Vice  President  of  NationsBank,   N.A.,  a  national   banking
association, on behalf of said association.


                                      /s/ Rose Marie Story
                                      Notary Public - State of Texas




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



     This  Agreement  is to be recorded in the Real  Property  Records of Travis
County, Texas.

Grantor:  National Instruments Corporation    Grantee:    NationsBank, N.A.
Address:  11500 N. Mopac Expressway           Address:    P.O. Box 908
          Austin, Texas 78759                             Austin, Texas 78781


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



     This  Agreement is to be recorded with the Texas  Secretary of State and in
the UCC Records of Travis County, Texas

Debtor:   National Instruments Corporation    Secured Party: NationsBank, N.A.
Address:  11500 N. Mopac Expressway           Address:       P.O. Box 908
          Austin, Texas 78759                                Austin, Texas 78781


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



After Recording, Please Return To:

Timothy C. Taylor, Esq.
Small, Craig & Werkenthin, P.C.
100 Congress Avenue, Suite 1100
Austin, Texas 78701-4099

                                    Page 41

<PAGE>

                             Officer's Certificate


     This  Officer's  Certificate  (this  "Certificate")  is  executed  by David
Hugley,  Secretary of National Instruments  Corporation,  a Delaware corporation
(the  "Corporation"),  for the benefit of NationsBank,  N.A., a national banking
association ("Lender").

     I, David Hugley, Secretary of the Corporation,  do hereby certify to Lender
the following:

     1. The  Corporation  is a  Delaware  corporation  duly  organized,  validly
existing,  and in good  standing  under the laws of the State of  Delaware.  The
Corporation  has paid when due all  franchise  and all other  taxes  required to
maintain its corporate existence and no such taxes are delinquent.  There are no
proceedings  pending for the  forfeiture  of the  Corporation's  Certificate  of
Incorporation   or   for   the   Corporation's   dissolution,   voluntarily   or
involuntarily.  The Corporation is duly qualified to do business in the State of
Texas and is in good  standing in the State of Texas.  The  Corporation  is duly
qualified as a foreign  corporation  and in good standing in other all states in
which it is doing business and in which it is required to be qualified.

     2.  All  tax  returns  required  to be  filed  by  the  Corporation  in any
jurisdiction  have  been  filed  and all  taxes,  assessments,  fees,  and other
governmental  charges upon the Corporation or upon any of its property have been
paid  prior to the time that such  taxes  could  give rise to a lien on any such
property.  There is no tax assessment  against the  Corporation  and there is no
basis for any such assessment. There are no actions, suits, or legal, equitable,
arbitration,  or administrative proceedings pending, or to the best knowledge of
the Corporation and the undersigned  threatened,  against the Corporation which,
if adversely determined, would have a material adverse effect on the validity or
enforceability  of any obligation of the  Corporation to Lender or the financial
condition or business  operations of the Corporation or could  otherwise  impair
the  ability  of the  Corporation  to  perform  its  obligations  to  Lender  in
connection with the Loan.

     3. The  Corporation  has the power and authority to conduct its business as
it is now conducted and to own all of its property. All documents and agreements
executed or to be executed by the  Corporation  in connection  with the Loan (a)
are within its corporate powers,  (b) have been duly authorized by all necessary
corporate action, (c) do not and will not contravene its charter, bylaws, or any
other law or governmental regulation, and (d) do not and will not contravene any
contractual  restriction  binding on or affecting the  Corporation or any of its
property. To the best knowledge and belief of the undersigned, all documents and
agreements  executed or to be executed by the Corporation in connection with the
Loan are, or will be when  executed and  delivered,  legal,  valid,  and binding
obligations  of  the  Corporation,   enforceable   against  the  Corporation  in
accordance with their terms (except to the extent  enforceability may be limited
by applicable bankruptcy, insolvency, reorganization,  moratorium, or other laws
or equitable  principles from time to time in effect which generally  affect the
enforcement of creditors' rights and remedies).

     4.  The  Secretary  is  the  keeper  of  the  records  and  minutes  of the
proceedings of the Board of Directors of the Corporation.  There is no provision
of the Articles of Incorporation or Bylaws of the Corporation limiting the power
of the Board of Directors to pass the  resolutions  set forth below and the same
are in  conformity  with the  provisions of such  Articles of  Incorporation  or
Bylaws.

     5. The  following  is a true and correct  copy of the  resolutions  adopted
either (a) at a meeting of the Corporation's  Board of Directors,  which meeting
was duly  called  and  held in  accordance  with  the law and the  Corporation's
Bylaws,  and at which meeting the Board duly and legally  passed and adopted the
following  resolutions,  or  (b)  by a  unanimous  consent  in  writing  of  all
Directors,  which  unanimous  written consent was and is in the form required by
and in conformity  with the Bylaws of the Corporation and the law. The following
resolutions have never been modified, rescinded, or repealed and are now in full
force and effect:

                                    Page 42

<PAGE>

     Resolved,  that the  Corporation  execute and deliver  all  agreements  and
     documents  requested by NationsBank,  N.A.  ("Lender"),  in connection with
     Lender's making of one or more loans (the "Loans") to the Corporation in an
     aggregate  principal  amount  not to  exceed  $28,480,000.00,  specifically
     including,  without limitation,  a revolving line of credit facility in the
     maximum  amount  of  $20,000,000.00  and  modification  of the terms of the
     existing   $8,840,000.00   note   payable  to  Lender  and  signed  by  the
     Corporation,  at such  rates of  interest  and upon  such  other  terms and
     conditions  as the  Corporation's  Chief  Financial  Officer shall agree to
     (subject to  approval by the  Corporation's  corporate  counsel);  that the
     Corporation can reasonably expect to derive certain  benefits,  directly or
     indirectly, from entering into such relationships with Lender; and that the
     Corporation enter into the Loans and all transactions  contemplated by said
     agreements  and  documents  pertaining  to  the  Loans,  including  without
     limitation,  renewal and extension of said  agreements  upon such terms and
     conditions  as the  Corporation's  Chief  Financial  Officer shall agree to
     (subject to approval by the Corporation's  corporate counsel),  and perform
     its obligations under said agreements; and

     Resolved  Further,  that  the  President,   Chief  Financial  Officer,  and
     Controller,  or any one of them, are hereby authorized and directed to take
     all  actions,  including  without  limitation  the making and  executing on
     behalf of the Corporation of any and all notes,  loan agreements,  negative
     pledge  agreements,  interest rate exchange  agreements,  advance requests,
     certifications,  and other agreements and/or documents  requested by Lender
     and  deemed  appropriate  by them,  or any one of them,  pertaining  to the
     Loans,  upon such terms and  conditions as the  Corporation,  acting by and
     through any one or more of said officers, shall agree to; and that all such
     instruments which may be executed by any of said officers,  executed in the
     accomplishment of any action or actions so authorized, be and they shall be
     considered as being the act of the Corporation,  irrespective of whether or
     not  there  is  affixed  to  such   instrument   the   attestation  of  the
     Corporation's Secretary or the Corporation's seal;

     Resolved  Further,  that advance requests and the exercise of interest rate
     options shall be made in accordance with the terms of the Loan Agreement to
     be  executed  by the  Corporation  and  Lender  (and  such  may be  made by
     telephone,  provided that all such  advances  under the line of credit loan
     shall be deposited into the Corporation's  demand deposit account held with
     Lender),  and the  above-named  persons are authorized to make such advance
     requests and to exercise such interest rate options and in otherwise acting
     in the name of and on  behalf of the  Corporation  in  connection  with any
     matters authorized under these Resolutions;

     Resolved  Further,   that  Lender  is  authorized  and  directed,   without
     limitation  or inquiry,  irrespective  of the  circumstances,  to honor and
     carry out all  orders,  directions,  or  instructions  of the  above  named
     persons as to the disposition of any amounts borrowed or credit obtained on
     behalf  of  the  Corporation  hereunder,  and  Lender  shall  be  under  no
     obligation or liability for the use or disposition of any amounts  borrowed
     or credit  obtained,  and further that the Corporation  shall indemnify and
     hold harmless Lender from any claim,  loss,  cost,  damage,  liability,  or
     expense arising out of Lender acting in reliance upon these Resolutions;

     Resolved Further, that all acts, transactions, and/or agreements undertaken
     prior  to  the   adoption  of  these   Resolutions   by  any   officers  or
     representatives  of the  Corporation  in its name and for its accounts with
     Lender in  connection  with the  foregoing  matters  are  hereby  ratified,
     confirmed, and adopted by the Corporation;

     Resolved  Further,   that  the  Secretary  of  the  Corporation  is  hereby
     authorized and directed to certify these Resolutions to Lender; and

     Resolved  Further,  that  Lender be  promptly  notified  in  writing by the
     Secretary or any other  officer of the  Corporation  of any change in these
     Resolutions, and until Lender has actually received such notice in writing,
     Lender is authorized to act in reliance on these Resolutions.

                                    Page 43

<PAGE>

     6. The  officers  of the  Corporation  as set  forth  below  have been duly
elected  and  qualified  and as of the date  hereof  hold the  offices  with the
Corporation  specified below. The signatures set forth beside each such person's
name is the true signature of such person.


         Title                   Typed Name                   Signature
======================== =========================== ===========================
        President              James Truchard        /s/ James Truchard
 Chief Financial Officer         Alex Davern         /s/ Alex Davern
       Controller                John Roiko          /s/ John Roiko
        Secretary               David Hugley         /s/ David Hugley

     7.  The  undersigned,   David  Hugley,  is  also  General  Counsel  of  the
Corporation.  The undersigned  certifies that the approvals of the Corporation's
corporate legal counsel required by the above resolutions have been obtained.

     8.  Attached  hereto  as  Exhibit  "A" is a true  and  correct  copy of the
Corporation's  Articles of  Incorporation.  Attached  hereto as Exhibit "B" is a
true and correct copy of the Corporation's Bylaws.

     EXECUTED  this 31 day of July,  1998,  by David  Hugley,  Secretary  of the
Corporation.




                                 /s/ David Hugley
                                 David Hugley, Secretary of National Instruments
                                 Corporation




     Subscribed To and Sworn before me, the undersigned  authority,  this 31 day
of July, 1998, by David Hugley, Secretary of National Instruments Corporation.


                                  /s/ Melanie J. Clevenger
                                  Notary Public - State of Texas

                                    Page 44

<PAGE>

                                                                June 30, 1998
                                                                Date of Notice

               N O T I C E   O F   F I N A L   A G R E E M E N T


TO: Borrower and All Other Obligors with Respect to the Loan Which is Identified
Below.

1.   THE WRITTEN  LOAN  AGREEMENT  REPRESENTS  THE FINAL  AGREEMENT  BETWEEN THE
     PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS,
     OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

2.   As used in this Notice:

     "Borrower" means National Instruments Corporation, a Delaware corporation.

     "Lender" means NationsBank, N.A., a national banking association.

     "Other  Obligor" means any entity or individual who (i) is obligated to pay
     the Loan,  or (ii)  otherwise is or becomes  obligated to pay the Loan (for
     example,  as  cosigner  or  guarantor),  or (iii) has  pledged  property as
     security for the Loan.

     "Loan" means the loan by Lender which is to be evidenced by the  promissory
     notes,  loan agreement,  or other evidence of  indebtedness  dated June 30,
     1998, executed by Borrower,  payable to the order of Lender, in the maximum
     principal amount of $20,000,000.00.

     "Loan Agreement" means one or more promises,  promissory notes, agreements,
     undertakings,  security agreements,  deeds of trust or other documents,  or
     commitments, or any combination of those actions or documents,  relating to
     the Loan.

3.   This  Notice is given by Lender  with  respect  to the  Loan,  pursuant  to
     Section 26.02 of the Texas  Business and Commerce  Code.  Borrower and each
     other  obligor  with  respect  to the Loan who  signs  below  acknowledges,
     represents, and warrants to Lender that Lender has given and such party has
     received and retained a copy of this Notice.

Lender:                                Borrower:

NationsBank, N.A.                      National Instruments Corporation
(a national banking association)       (a Delaware corporation)

 
By: /s/ Eric Kosmin                    By: /s/ Alex Davern
    Eric Kosmin, Vice President            Alex Davern, Chief Financial Officer

                                    Page 45

<PAGE>

                   NOTICE BY LENDER'S ATTORNEY TO BORROWER


Date:  June 30, 1998

Borrower:  National Instruments Corporation, a Delaware corporation

Lender:  NationsBank, N.A., a national banking association

Loan:  Loan evidenced by a promissory  note of even date herewith in the maximum
principal amount of $20,000,000.00, executed by Borrower, payable to Lender

This notice  discloses the relationship  between the law firm of Small,  Craig &
Werkenthin, P.C. ("scw"), Borrower, and Lender.

     1. Lender has engaged scw to prepare  the note,  loan  agreement,  security
agreements, and other documents relating to the Loan.

     2.  scw  represents  only  Lender  and no  other  party  involved  in  this
transaction, although scw's legal fees may be paid by Borrower.

     3. scw's legal fees in this transaction are based on the hourly rate of the
lawyer(s) and  paralegal(s)  working on this matter.  The sums to be paid to scw
may also include  reimbursement to scw for expenses  incurred in connection with
scw's  representation  of Lender,  including  without  limitation  as  photocopy
charges,  long distance  telephone,  UCC searches,  obtaining  certificates  and
documents from public authorities, and local and overnight courier charges.
 
     4. Borrower has the right to be represented by its own attorney and to have
its attorney  review the loan documents and closing  documents and be present at
the closing of the loan.

     5. If any documents to be used are prepared by someone other than scw, then
Lender  reserves  the right to have scw  review and  approve  the  documents  so
prepared in order to ensure they properly protect the interests of Lender.

Please sign below to indicate that you have been notified of and understand your
right to independent  legal counsel and that the firm of scw represents only the
interests of Lender, and not those of any other party.

                                    Borrower:

                                    National Instruments Corporation
                                    (a Delaware corporation)


                                    By: /s/ Alex Davern
                                        Alex Davern, Chief Financial Officer

                                    Page 46

                                   EXHIBIT 11.1

              STATEMENT REGARDING COMPUTATION OF NET INCOME PER SHARE
                      (In thousands, except per share data)
                                   (unaudited)

<TABLE>
<CAPTION>
                                              Three Months Ended   Six Months Ended
                                                    June 30,           June 30,
                                              ------------------  ------------------
                                                1998      1997      1998      1997
                                              ========  ========  ========  ========
                                              <S>       <C>       <C>       <C>
Net Income.................................   $  9,198  $ 8,581  $  18,029  $ 16,149
                                              ========  ========  ========  ========

Basic earnings per share...................   $   0.28  $   0.26  $   0.55  $   0.50
                                              ========  ========  ========  ========

Weighted average shares outstanding-basic..     32,800    32,552    32,800    32,514
                                              ========  ========  ========  ========

Diluted earnings per share.................   $   0.27  $   0.26  $   0.53  $   0.48
                                              ========  ========  ========  ========

Weighted average shares outstanding-diluted     34,200    33,435    34,200    33,435
                                              ========  ========  ========  ========

Calculation of Weighted Average Shares:
  Weighted Average Common Stock
    Outstanding-basic......................     32,800    32,552    32,800    32,514
                                              ========  ========  ========  ========

  Weighted Average Common Stock Options,
    utilizing the treasury stock method....      1,400       883     1,400       921
                                              --------  --------  --------  --------

Weighted average shares outstanding-diluted     34,200    33,435    34,200    33,435
                                              ========  ========  ========  ========
</TABLE>

<TABLE> <S> <C>
                              
<ARTICLE>                          5
<LEGEND>                        
     (This schedule  contains summary financial  information  extracted from the
Consolidated  Balance  Sheet and  Statements of Income filed as part of the June
30, 1998 Form 10-Q and is qualified in its entirety by reference to such report)
</LEGEND>                       
<MULTIPLIER>                             1000
                                    
<S>                                  <C>
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                  DEC-31-1998
<PERIOD-START>                     JAN-01-1998
<PERIOD-END>                       JUN-30-1998
<CASH>                                  31678
<SECURITIES>                            46886
<RECEIVABLES>                           41070
<ALLOWANCES>                                0
<INVENTORY>                             16725
<CURRENT-ASSETS>                       151706
<PP&E>                                  66830
<DEPRECIATION>                              0
<TOTAL-ASSETS>                         225160
<CURRENT-LIABILITIES>                   38414
<BONDS>                                     0
                       0
                                 0
<COMMON>                                  328
<OTHER-SE>                             181131
<TOTAL-LIABILITY-AND-EQUITY>           225160
<SALES>                                133123
<TOTAL-REVENUES>                       133123
<CGS>                                   31658
<TOTAL-COSTS>                           31658
<OTHER-EXPENSES>                        75648
<LOSS-PROVISION>                            0
<INTEREST-EXPENSE>                          0
<INCOME-PRETAX>                         26908
<INCOME-TAX>                             8879
<INCOME-CONTINUING>                     18029
<DISCONTINUED>                              0
<EXTRAORDINARY>                             0
<CHANGES>                                   0
<NET-INCOME>                            18029
<EPS-PRIMARY>                               0.55
<EPS-DILUTED>                               0.53
        
 

</TABLE>


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