NATURAL MICROSYSTEMS CORP
8-K/A, 1996-08-12
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                  FORM 8-K/A
                               (Amendment No. 1)

               Current Report Pursuant to Section 13 or 15(d) of
                      The Securities Exchange Act of 1934



                       Natural MicroSystems Corporation
       ----------------------------------------------------------------
            (Exact Name of Registrant as Specified in its Charter)


                                   Delaware
       ----------------------------------------------------------------
                   (State of Incorporation or Organization)


                   0-23282                        04-2814586
       -----------------------------------------------------------------
         (Commission File Number) (I.R.S. Employer Identification No.)


                   8 Erie Rd., Natick, Massachusetts  01760
       ----------------------------------------------------------------
              (Address of Principal Executive Offices) (Zip Code)


       Registrant's telephone number, including area code: (508)650-1300
                                                           -------------
<PAGE>
 
     This Form 8-K/A is being filed by the Registrant to amend and restate the
Registrant's current report on Form 8-K filed on June 28, 1996 by amending and
restating Item 7 to include the required historical and pro forma financial
statements omitted therefrom as permitted by the provisions thereof.

Item 2.  Acquisition or Disposition of Assets.
         -------------------------------------

     On June 14, 1996, the Registrant acquired two Illinois corporations, Tek-
     Nique, Inc. ("Tek") and PSR Systems, Inc. ("PSR").  Tek was acquired by
     merger for $3.55 million in cash plus up to an additional $2.5 million in
     cash to be paid at later dates subject to certain performance conditions.
     PSR was acquired for 41,479 shares of the Registrant's common stock plus up
     to an additional $500,000 in value of such stock at a later date subject to
     certain performance conditions.  Tek and PSR were under common ownership,
     consisting principally of Herbert L. Pavey and Julius Rothschild, the
     founders, and also including certain other employees.  Tek and PSR have
     operated a single business ("TEKnique") of designing, marketing and
     maintaining certain networking software programs, which business the
     Registrant intends to continue.


Item 7.  Financial Statements and Exhibits.
         ----------------------------------

(A)  Historical Combined Financial Statements of PSR Systems, Inc. and Tek-
     Nique, Inc. (TEKnique)

     (1)  Audited Combined Financial Statements of TEKnique:

          Report of KPMG Peat Marwick LLP, Independent Auditors
          Combined Balance Sheets as of January 31, 1995 and 1996
          Combined Statements of Operations for the years ended 
           January 31, 1995 and 1996
          Combined Statements of Stockholders' Equity for the years
           ended January 31, 1995 and 1996
          Combined Statements of Cash Flows for the years ended
           January 31, 1995 and 1996
          Notes to Combined Financial Statements

     (2)  Unaudited Combined Financial Statements of TEKnique:

          Combined Balance Sheet as of April 30, 1996
          Combined Statements of Operations for the three months ended
           April 30, 1995 and 1996
          Combined Statements of Stockholders' Equity for the three months
           ended April 30, 1995 and 1996
          Combined Statements of Cash Flows for the three months ended
           April 30, 1995 and 1996
          Notes to Combined Financial Statements

                                       2
<PAGE>
 
(B)  Pro Forma Financial Information (Unaudited)

     Pro Forma Condensed Consolidated Balance Sheet as of March 31,
       1996
     Pro Forma Condensed Consolidated Statement of Operations for
       the three months ended March 31, 1996
     Pro Forma Condensed Consolidated Statement of Operations for
       the year ended December 31, 1995
     Notes to Pro Forma Combined Financial Statements

(C)  Exhibits

     Exhibit No.  Title
     -----------  -----

     2.1*         Merger Agreement and Plan of Reorganization dated as of June
                  14, 1996 among Natural MicroSystems Corporation, NMS
                  Acquisition Corp., Tek-Nique, Inc. and certain of the
                  stockholders of Tek-Nique, Inc. dated as of June 14, 1996.

     2.2*         Stock Purchase Agreement among Natural MicroSystems
                  Corporation and the stockholders of PSR Systems, Inc. dated as
                  of June 14, 1996.

     23.1         Consent of KPMG Peat Marwick LLP
 
     * Filed with Form 8-K filed on June 28, 1996.

                                       3
<PAGE>
 
                          Independent Auditors' Report
                          ----------------------------


The Board of Directors and Stockholders
PSR Systems, Inc. and TEKnique, Inc.:


We have audited the accompanying combined balance sheets of PSR Systems, Inc.
and TEKnique, Inc. (together "PSR/TEKnique") as of January 31, 1995 and 1996,
and the related combined statements of operations, stockholders' equity and cash
flows for the years then ended.  These combined financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these combined financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the combined financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management as well as evaluating the overall financial statement
presentation.  We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, the combined financial statements referred to above present
fairly, in all material respects, the combined financial position of
PSR/TEKnique at January 31, 1995 and 1996, and the results of their operations
and their cash flows for the years then ended in conformity with generally
accepted accounting principles.



                                         KPMG Peat Marwick LLP

Boston, Massachusetts
June 14, 1996
<PAGE>
 
                      PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                            Combined Balance Sheets

                           January 31, 1995 and 1996
<TABLE>
<CAPTION>
                                           January 31,   January 31,
                       Assets                 1995          1996
                       ------                 ----          ----
<S>                                        <C>           <C>
 
Current Assets:
   Cash and cash equivalents               $ 243,686        203,376 
   Accounts receivable                       188,847        287,896 
   Prepaid expenses                            3,862         12,348 
   Inventory                                       -        175,210 
                                             -------      --------- 
                                                                    
            Total current assets             436,395        678,830 
                                             -------      --------- 
                                                                    
Property and equipment, net of                                      
   accumulated depreciation                                         
   and amortization                          291,620        222,770 
Cash value of officers' life insurance       160,961        231,819 
                                             -------      --------- 
                                                                    
            Total assets                   $ 888,976      1,133,419 
                                             =======      ========= 
                                                                    
            Liabilities and Stockholders' Equity                    
            ------------------------------------                    
                                                                    
Current Liabilities:                                                
   Accounts payable                        $ 176,938        180,706 
   Accrued compensation                      100,762        105,992 
   Deferred revenues                         167,529        233,072 
   Current portion of long-term debt          68,232        122,119 
                                           ---------      --------- 
                                                                    
            Total current liabilities        513,461        641,889 
                                             -------      --------- 
                                                                    
Long-term debt, less current portion           8,628              - 
                                                                    
Commitments and contingencies                                       
                                                                    
Stockholders' equity:                                               
   Common stock, at stated value              13,000         13,000 
   Retained earnings                         509,087        633,730 
   Notes receivable - officers               (70,000)       (70,000)
   Treasury stock                            (85,200)       (85,200)
                                             --------      ---------
                                                                    
            Total stockholders' equity       366,887        491,530 
                                             -------      --------- 
                                                                    
            Total liabilities and                                   
            stockholders' equity           $ 888,976      1,133,419 
                                             =======      =========  
</TABLE>
The accompanying notes are an integral part of these combined financial
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                       Combined Statements of Operations

                     Years ended January 31, 1995 and 1996


<TABLE>
<CAPTION>
                                              January 31,  January 31,
                                                  1995        1996
                                                  ----        ----

<S>                                           <C>          <C>
Revenues                                      $ 2,853,544  2,790,549
 
Cost of revenues                                1,131,279  1,167,540
                                                ---------  ---------

          Gross profit                          1,722,265  1,623,009
                                                ---------  ---------
Operating expenses:
   Research and development                       495,706    416,585
   Sales and marketing                            105,458    108,231
   General and administrative                     956,807    897,681
                                                ---------  ---------
  
          Total operating expenses              1,557,971  1,422,497
 
Operating income                                  164,294    200,512
Interest expense                                    6,974     21,768
                                                ---------  ---------     
 
          Income before income taxes              157,320    178,744
                                                ---------  ---------
 
Income taxes                                       39,739     54,101
                                                ---------  ---------     
   
          Net income                          $   117,581    124,643
                                                =========  =========
</TABLE>

The accompanying notes are an integral part of these combined financial
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                  Combined Statements of Stockholders' Equity

                     Years ended January 31, 1995 and 1996
<TABLE>
<CAPTION>
                                                                                             
                                     Common Stock                                           Notes         Total
                                  ----------------      Treasury        Retained          receivable-    stockholders'
                                  Shares    Amount        stock         earnings           officers         equity
                                  ------    ------        -----         --------           --------         ------
<S>                               <C>      <C>           <C>             <C>               <C>              <C>  
Balances at January 31, 1994      305,000  $ 13,000      (85,200)        391,506           (70,000)         249,306
  
  Net income                           -         -            -          117,581                -           117,581
                                  -------   -------      --------        -------           --------         -------
Balances at January 31, 1995      305,000    13,000      (85,200)        509,087           (70,000)         366,887
 
  Net income                           -         -            -          124,643                -           124,643
                                  -------   -------      --------        -------           --------         -------
Balances at January 31, 1996      305,000  $ 13,000      (85,200)        633,730           (70,000)         491,530
                                  =======   =======      ========        =======           ========         =======
</TABLE>

The accompanying notes are an integral part of these combined financial
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                       Combined Statements of Cash Flows

                     Years ended January 31, 1995 and 1996
<TABLE>
<CAPTION>
 
 
                                                     January 31,     January 31,
                                                        1995            1996
                                                        ----            ----

<S>                                                  <C>             <C> 
Cash flows from operations:
   Net income                                        $  117,581         124,643
 Adjustments to reconcile net income to            
   cash provided by operating activities:          
   Depreciation and amortization                        197,124         156,346
   Changes in assets and liabilities:                
     Decrease (increase) in accounts receivable          13,947         (99,049)
     Increase in prepaid expenses                        (1,612)         (8,486)
     Increase in inventory                                   -         (175,210)
     (Decrease) increase in accounts payable            (82,659)          3,768
     (Decrease) increase in accrued expenses            (67,529)          5,230
     (Decrease) increase in deferred revenue            (83,179)         65,543
                                                       --------        -------- 

          Cash provided by operating activities          93,673          72,785
                                                       --------        -------- 
Cash flows from investing activities:
   Purchases of property and equipment                 (119,596)       (87,496)
   Increase in cash value of officers' life insurance   (24,478)       (70,858)
                                                       --------       -------- 
          Cash used in investing activities            (144,074)      (158,354)
                                                       --------       -------- 
Cash flows from financing activities:
   Proceeds from indebtedness                           524,000        858,755
   Payments on indebtedness                            (516,805)      (813,496)
                                                       --------       -------- 
          Cash provided by financing activities           7,195         45,259
                                                       --------       -------- 
Net decrease in cash and cash equivalents               (43,206)       (40,310)
 
Cash and cash equivalents at beginning of period        286,892        243,686
                                                       --------       -------- 
Cash and cash equivalents at end of period           $  243,686        203,376
                                                       ========       ========
Supplemental disclosures:
   Cash paid for interest                            $    2,322          7,706
                                                       ========       ========
   Cash paid for income taxes                        $   16,000         14,020
                                                       ========       ========
</TABLE>
The accompanying notes are an integral part of these combined financial
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements

                           January 31, 1995 and 1996


(1)  Summary of Significant Accounting Policies

     The Company
     PSR Systems, Inc. ("PSR") and TEKnique, Inc. ("TEKnique") (together the
       "Company") designs, manufactures and markets high-value data
       communications hardware and software.
 
     These combined financial statements include the accounts of both PSR and
       TEKnique.  Both companies are under common ownership and management.  All
       intercompany transactions and balances have been eliminated.

     Cash and Cash Equivalents
     The Company considers all highly liquid investments purchased with
       maturities of three months or less to be cash equivalents.
 
     Property and Equipment
     Property and equipment are stated at cost, net of accumulated amortization
       and depreciation. Property and equipment are depreciated using
       accelerated methods over the estimated useful lives of the assets (three
       to five years). Leasehold improvements are amortized using accelerated
       methods over the lesser of the estimated useful life of the asset (10
       years) or the lease term. Management reviews the recoverability of
       property and equipment periodically, and adjusts the carrying value when
       impairment, if any, is identified.

     Financial Instruments
     The recorded cost of financial instruments approximate their fair market 
       values.

     Revenue Recognition
     Revenue from the sale of hardware and software is recognized when the
       products are shipped to customers. Revenue derived from engineering and
       software development services is recognized as the services are
       performed. Maintenance contract revenue is recognized ratably over the
       life of the contracts, usually 12 months.

     Inventory
     Inventories, substantially all finished goods, are stated at the lower of
       cost or market. Cost is determined on a first-in, first-out basis.

     Research and Development
     Research and development expenditures are charged to operations as
       incurred. Software development costs are required to be capitalized when
       a product's technological feasibility has been established by completion
       of a working model of the product and ending when a product is available
       for general release to customers. To date, completion of a working model
       of the Company's products and general release have substantially
       coincided. As a result, the Company has not capitalized any software
       development costs since such costs have not been significant.
 
                                                                     (Continued)
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements
 

     Income Taxes

     The Company records income taxes using the asset and liability method.
       Deferred tax assets and liabilities are recognized for the future tax
       consequences attributable to differences between the financial statement
       carrying amounts of existing assets and liabilities and their respective
       tax bases. Deferred tax assets and liabilities are measured using enacted
       tax rates expected to apply to taxable income in the years in which those
       temporary differences are expected to be recovered or settled. The effect
       on deferred tax assets and liabilities of a change in tax rates is
       recognized in income in the period that includes the enactment date.
 
     Use of Estimates
     The preparation of financial statements in conformity with generally
       accepted accounting principles requires management to make estimates and
       assumptions that affect the reported amounts of assets and liabilities
       and disclosure of contingent assets and liabilities at the date of the
       financial statements and the reported amounts of revenues and expenses
       during the reporting period. Actual results could differ from those
       estimates.

     Deferred Revenue
     Deferred revenue is comprised of billings in excess of earnings on
       maintenance contracts.

 (2) Property and Equipment

     Property and equipment, at cost, consists of the following:
<TABLE>
<CAPTION>
                                          January 31,      January 31,
                                             1995             1996
<S>                                       <C>              <C>
 
       Computers and equipment          $ 1,183,768        1,263,857
       Furniture and fixtures               211,292          211,292
       Leasehold improvements                84,251           91,658
                                          ---------        ---------
                                          1,479,311        1,566,807
       Less accumulated depreciation
       and amortization                   1,187,691        1,344,037
                                          ---------        ---------

                                        $   291,620          222,770
                                          =========        ========= 
</TABLE>
(3)  Business and Credit Concentration

     Two customers accounted for 35% and 50% of the Company's revenues and 27%
       and 56% of accounts receivable for and as of the years ended January 31,
       1995 and 1996, respectively. As is customary in its industry, the Company
       does not require collateral on accounts receivable. The Company's credit
       losses have not been material for any periods presented.
 
(4)  Indebtedness

     The Company has an available bank line of credit of $300,000. Borrowings
       are secured by all of the Company's assets, and bear interest at the
       bank's prime rate (8.5% at January 31, 1996). The line matures on July 1,
       1996. As of January 31, 1996, availability under the credit facility was
       $190,000. The Company also has an equipment loan in the original amount
       of $50,000. The loan bears interest at the bank's prime rate (8.5% at
       January 31, 1996). The outstanding balance on the equipment loan at
       January 31, 1996 was approximately $9,000. The loan matures on June 1,
       1996 and is secured by substantially all of the Company's assets.

                                                                     (Continued)
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements

 
       The line of credit has debt covenants requiring that the Company maintain
       certain financial ratios. The Company was not in compliance with the
       financial ratios at January 31, 1996 and, as a result, all of the
       Company's debt is due on demand. In June 1996, the Company paid down the
       then outstanding balance on both the bank line of credit and the
       equipment loan.

(5)  Commitments and Contingencies

     Leases
     The Company leases its facilities from a related party (note 9) under an
       operating lease which expires in September 2000. Future minimum lease
       payments as of January 31, 1996 under these leases for each fiscal year
       end are as follows:
<TABLE>
<CAPTION>
                  <S>                                    <C>
                  1997                                   $ 132,458
                  1998                                     132,458
                  1999                                     132,458
                  2000                                      99,343
                                                           -------
                                                         $ 496,717
                                                           =======
</TABLE>
 
     The Company has the option of terminating the lease in 1996 for a payment
       of $10,000. Rent expense for each of the years ended January 31, 1995 and
       1996 was $132,000.

     The Company is subject to legal proceedings and claims which arise in the
       ordinary course of its business. In the opinion of management, the amount
       of ultimate liability with respect to these actions will not materially
       effect the financial position or operating results of the Company.
 
(6)  Stockholders' Equity
 
     Stock Options
 
     PSR adopted the PSR Systems, Inc. Incentive Option Plan in February 1985 to
       grant options to certain key employees. PSR has issued stock options to
       two key employees who may purchase a total of 6,000 shares of PSR stock
       at an exercise price of $5.00 per share, the deemed fair market value of
       the stock at the dates of grant. Twenty-five percent of the options
       become exercisable in each of April and May of 1996, and April and May of
       1997. The options expire in May 1998.

     Common Stock
     Common stock accounts for each of the combining companies is as follows at
       January 31, 1995 and 1996:
<TABLE>
<CAPTION>
                                                          PSR      TEKnique
<S>                                                    <C>           <C>
     Common stock, without par value, 1,000,000 shares
       authorized, 302,000 shares issued and  
       outstanding, includes shares in treasury        $  12,000
     Common stock, without par value, 1,000,000 shares
       authorized, 3,000 shares issued and outstanding               1,000
     Less PSR common stock in treasury, at cost,
       133,333 shares                                    (85,200)      -
                                                        --------   -------
             Total                                     $ (73,200)    1,000
                                                        ========   =======
</TABLE> 
     Prior to fiscal year 1995, PSR Systems, Inc. had purchased an aggregate of
       133,333 shares of common stock from former shareholders for an aggregate
       price of $85,200.
                                                                     (Continued)
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements


(7)  Income Taxes

     The components of income tax expense consist of the following:

<TABLE> 
<CAPTION> 
                                                                              Year ended
                                                                              January 31,
                                                                          -------------------
                                                                           1995         1996
                                                                           ----         ----

     <S>                                                                 <C>           <C> 
     Current income tax expense:
        Federal                                                          $ 32,143      45,523
        State                                                               7,596       8,578
                                                                           ------      ------
 
           Total current income tax expense                                39,739      54,101
  
     Deferred income tax expense                                                -           -
                                                                           ------      ------
           Total income tax expense                                      $ 39,739      54,101
                                                                           ======      ====== 
</TABLE> 

     The difference between total expected income tax expense from operations
       computed by applying the U.S. Federal statutory income tax rate of 34% to
       income before taxes and the reported income tax expense is as follows:

<TABLE> 
<CAPTION> 
  
                                                                              Year ended
                                                                              January 31,
                                                                          -------------------
                                                                           1995         1996
                                                                           ----         ----
 
       <S>                                                              <C>            <C> 
       Computed expected tax expense                                     $ 53,488      60,773
       State income taxes (net of U.S. Federal tax benefit)                 5,012       5,684
       Benefit of graduated tax rate                                       (8,884)     (7,813)
       Other                                                               (9,877)     (4,543)
                                                                           ------      ------
                                                                         $ 39,739      54,101
                                                                           ======      ======
</TABLE>
(8)  Segment Information

     The Company conducts its business within one industry segment, primarily in
       North America.

                                                                     (Continued)
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements

 
(9)  Related Party Transactions

     As of January 31, 1996, the Companies had notes receivable which totaled
       $70,000 from their two stockholders. The loans are interest free and are
       payable on demand (see note 11).
 
     The Company leases their only facility from a corporation which is 50%
       owned by the Company's two stockholders. Total rent payments to the
       corporation amounted to $131,539 and $132,458 for the years ended January
       31, 1995 and 1996, respectively. Management believes that the lease
       rental rate was at fair market value on the date of execution.

(10) Dependence on Contract Assembly Manufacturer

     The Company relies on a single source for its contract manufacturing.
       Although a number of such contract manufacturers exist, the interruption
       or termination of the Company's current manufacturing relationship could
       have a short-term adverse effect on the Company's business.

(11) Subsequent Events (Unaudited)
 
     In June 1996, TEKnique entered into a Merger Agreement and Plan of
       Reorganization among National MicroSystems Corporation, NMS Acquisition
       Corporation, TEKnique, Inc. and certain of the stockholders of TEKnique,
       Inc. (the "Agreement") pursuant to which all of the outstanding shares of
       common stock of TEKnique will be converted into and exchanged for shares
       of Natural MicroSystems Corporation upon consummation of the Agreement.
 
     Concurrently, PSR entered into a Stock Purchase Agreement among Natural
       MicroSystems Corporation and the stockholders of PSR Systems, Inc. (the
       "Stock Purchase Agreement") pursuant to which all of the outstanding
       capital stock of PSR will be sold to Natural MicroSystems Corporation in
       return for cash.

     Pursuant to both the Agreement and the Stock Purchase Agreement (together
       the "Agreements"), immediately prior to the closing of the Agreements
       certain employees were granted shares in the Companies in return for a
       relinquishment of any equity claim that may have existed at that time,
       including pursuant to stock options described in note 6. Such granting of
       shares resulted in a charge to earnings and a contribution of capital of
       approximately $500,000.
 
     In addition, the Agreement and Stock Purchase Agreement provided for the
       distribution of the cash value of officers' life insurance and
       cancellation of notes receivable from officers as additional compensation
       to the officers.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                            Combined Balance Sheet

                                April 30, 1996
                                  (Unaudited)


<TABLE>
<CAPTION>
                          Assets
                          ------

<S>                                                     <C> 
Current assets:
   Cash and cash equivalents                            $   219,413
   Accounts receivable                                      384,103
   Prepaid expenses                                          12,348
   Inventory                                                196,341
                                                          ---------
        Total current assets                                812,205
  
Property and equipment, net of accumulated depreciation
 and amortization                                           229,274
Cash value of officers' life insurance                      248,016
                                                          ---------          
                                                        $ 1,289,495
                                                          ========= 
            Liabilities and Stockholders' Equity
            ------------------------------------
Current liabilities:
   Accounts payable                                     $   160,929
   Accrued compensation                                     107,083
   Accrued income taxes                                      97,646
   Deferred revenues                                        151,445
   Current portion of long-term debt                          4,119
                                                          ---------  
        Total current liabilities                           521,222
                                                          ---------  
Commitments and contingencies
  
Stockholders' equity:
   Common stock, at stated value                             13,000
   Retained earnings                                        910,473
   Notes receivable - officers                              (70,000)
   Treasury stock                                           (85,200)
                                                          ---------
        Total stockholders' equity                          768,273
                                                          ---------
        Total liabilities and stockholders' equity      $ 1,289,495
                                                          ========= 
</TABLE>

The accompanying notes are an integral part of these combined financial 
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                       Combined Statements of Operations

                  Three months ended April 30, 1995 and 1996
                                  (Unaudited)
<TABLE>
<CAPTION>
 
 
                                                  April 30,            April 30,
                                                    1995                 1996
                                                    ----                 ----
<S>                                               <C>                  <C> 

Revenues                                          $ 733,643            1,067,623
 
Cost of revenues                                    268,781              361,111
                                                    -------           ----------
 
        Gross profit                                464,862              706,512
                                                    -------           ----------
Operating expenses:
    Research and development                        104,756              117,055
    Sales and marketing                              25,287               20,931
    General and administrative                      236,631              203,158
                                                    -------           ----------
 
        Total operating expenses                    366,674              341,144
 
Operating income                                     98,188              365,368
Interest expense                                      5,488                2,426
                                                    -------           ---------- 

        Income before income taxes                   92,700              362,942
 
Income taxes                                         24,114               86,199
                                                    -------           ----------

        Net income                                $  68,586              276,743
                                                    =======           ==========
</TABLE>

The accompanying notes are an integral part of these combined financial 
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                  Combined Statements of Stockholders' Equity

                  Three months ended April 30, 1995 and 1996
                                  (Unaudited)
<TABLE>
<CAPTION>
 
 
                                                                                                          
                                             Common Stock                                     Notes         Total    
                                        ---------------------       Treasury     Retained   receivable-   stockholders'
                                        Shares         Amount        stock       earnings    officers       equity
                                        ------         ------        -----       --------    --------       ------
<S>                                    <C>         <C>             <C>            <C>         <C>           <C>       
 
Balances at January 31, 1995           305,000     $   13,000      (85,200)       509,087     (70,000)      366,887
 
   Net income                             -               -            -           68,586         -          68,586
                                       -------        -------      -------        -------     --------      -------

Balances at April  30, 1995            305,000         13,000      (85,200)       577,673     (70,000)      435,473
                                       =======        =======      =======        =======     ========      =======

Balances at January 31, 1996           305,000         13,000      (85,200)       633,730     (70,000)      491,530
 
   Net income                             -               -            -          276,743         -         276,743
                                       -------        -------      -------        -------     --------      -------

Balances at April 30, 1996             305,000     $   13,000      (85,200)       910,473     (70,000)      768,273
                                       =======        =======      =======        =======     ========      =======
</TABLE>

The accompanying notes are an integral part of these combined financial 
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                       Combined Statements of Cash Flows

                  Three months ended April 30, 1995 and 1996
                                  (Unaudited)
<TABLE>
<CAPTION>
 
 
                                                         April 30,     April 30,
                                                           1995           1996
                                                           ----           ----
<S>                                                      <C>            <C>
Cash flows from operations:
 Net income                                               $   68,586      276,743
 Adjustments to reconcile net income to cash (used in)
  provided by operating activities:
     Depreciation and amortization                            31,175       22,678
     Changes in assets and liabilities:
       Increase in accounts receivable                      (154,902)     (96,207)
       Decrease in prepaid expenses                            1,612         -
       Increase in inventory                                (142,749)     (21,131)
       (Decrease) increase in accounts payable               (43,895)       1,471
       Increase in accrued compensation                        6,650        1,091
       Increase in accrued income taxes                       30,723       76,398
       Decrease in deferred revenue                             -         (81,627)
                                                            --------     -------- 
         Cash (used in) provided by operating activities    (202,800)     179,416
                                                            --------     -------- 
Cash flows from investing activities:
 Purchases of property and equipment                          (9,852)     (29,182)
 Increase in cash value of officers' life insurance          (13,663)     (16,197)
                                                            --------     -------- 
         Cash used in investing activities                   (23,515)     (45,379)
                                                            --------     -------- 
Cash flows from financing activities:
 Proceeds from indebtedness                                  173,755          -
 Payments on indebtedness                                    (19,184)    (118,000)
                                                            --------     --------
         Cash provided by (used in) financing activities     154,571     (118,000)
                                                            --------     -------- 
Net (decrease) increase in cash and cash equivalents         (71,744)      16,037
 
Cash and cash equivalents at beginning of period             243,686      203,376
                                                            --------     --------

Cash and cash equivalents at end of period                $  171,942      219,413
                                                            ========     ======== 

Supplemental disclosures:
 Cash paid for interest                                   $    5,534        2,486
                                                            ========     ========
 Cash paid for income taxes                               $   10,675        9,802
                                                            ========     ========
</TABLE>

The accompanying notes are an integral part of these combined financial 
statements.
<PAGE>
 
                     PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                    Notes to Combined Financial Statements

                                April 30, 1996
                     (In thousands except per share data)

1) Basis of Presentation

The unaudited financial statements as of April 30, 1996 and for the three month
periods ended April 30, 1995 and 1996 have been prepared in accordance with
generally accepted accounting principles and include all adjustments, which in
the opinion of management, are necessary to present fairly the results of
operations for the period then ended.

2) Acquisition

In June 1996, Teknique and PSR (together "Tekniqus") entered into agreements
with Natural MicroSystems Corporation ("NMS") whereby NMS acquired all the
Common Stock of Teknique for a purchase price of $5,389. The effective date of
the sale of stock was June 14, 1996.
<PAGE>
 
                       PROFORMA FINANCIAL STATEMENTS OF
                       NATURAL MICROSYSTEMS CORPORATION

The following unaudited Pro Forma Condensed Consolidated Financial Statements
set forth the combined results of operations of Natural MicroSystems Corporation
("NMS") and PSR Systems, Inc. and Teknique, Inc. (together "Teknique") based
upon accounting for the acquisition as a purchase and assuming as if the
acquisition was consummated as of the beginning of the year ended December 31,
1995.


The unaudited pro forma consolidated financial information combines the 
historical statements of operations of NMS and Teknique for the year ended 
December 31, 1995 and the three months ended March 31, 1996. The unaudited pro 
forma consolidated balance sheet combined the historical balance sheets of NMS 
and Teknique as of March 31, 1996.

The Pro Forma Consolidated Financial Statements which follow should be read in 
conjunction with the historical Financial Statements of NMS and Teknique.
<PAGE>
 
                     NATURAL MICROSYSTEMS CORPORATION AND
                 COMBINED PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                 Proforma Condensed Consolidated Balance Sheet

                                March 31, 1996
                                  (Unaudited)
                                (In thousands)
 

<TABLE> 
<CAPTION> 
                                                                                                 Pro forma
                                                           Natural        PSR Systems, Inc.     Adjustments
                                                         Microsystems     & TEKnique, Inc.        Increase          Pro forma
               Assets                                    Corporation         Combined            (Decrease)         Combined 
               ------                                    -----------         --------            ----------         -------- 
<S>                                                      <C>                 <C>                 <C>                <C>      
                                                                                                                             
Current assets:                                                                                                              
  Cash and cash equivalents                               $  10,719             219               (3,550)  (a)         7,388 
  Marketable securities                                      26,852             -                    -                26,852 
  Accounts receivable, net of allowance for                                                                                  
   uncollectible accounts                                    10,598             384                  -                10,982 
  Inventories                                                 4,538             196                  -                 4,734 
  Prepaid expenses and other assets                           1,270              13                  -                 1,283 
  Deferred tax assets, net of valuation allowance               534             -                    -                   534 
                                                            -------          ------               ------             ------- 
         Total current assets                                54,511             812               (3,550)             51,773 
                                                            -------          ------               ------             ------- 
                                                                                                                             
Property and equipment, net of accumulated depreciation       2,542             229                  186  (b)          2,957
License agreements, net of accumulated amortization           1,329              -                    -                1,329 
Goodwill                                                         -               -                   293  (b)            293 
Other assets                                                    199             248                 (248) (b)            199
Deferred tax asset, net of valuation allowance                  328              -                    -                  328 
                                                            -------          ------               ------             ------- 
                                                          $  58,909           1,289               (3,319)             56,879 
                                                            =======          ======               ======             ======= 
       Liabilities and Stockholders' Equity                                                                                  
       ------------------------------------                                                                                  
                                                                                                                             
Current liabilities:                                                                                                         
  Bank line of credit                                     $     221               4                  -                   225 
  Accounts payable                                            5,506             161                  -                 5,667 
  Accrued expenses and other liabilities                      2,976             356                  500   (a)               
                                                                                                     284   (a)         4,116 
                                                            -------          ------               ------             ------- 
        Total current liabilities                             8,703             521                  784              10,008 
                                                            -------          ------               ------             ------- 
Deferred tax liability                                          -               -                    -                   -   
Capital lease obligations, less current portion                   1             -                    -                     1 
Long-term debt, less current portion                              9             -                    -                     9 
Refundable advance                                              338             -                    -                   338 
                                                                                                                             
Stockholders' equity:                                                                                                        
  Common stock                                                   49              13                  (13)  (b)            49 
  Additional paid-in capital                                 51,384             -                  1,339   (a)        52,723 
  Retained earnings (deficit)                                (1,703)            910                 (910)  (b)               
                                                                                                  (4,426)  (b)               
                                                                                                    (248)  (b)        (6,377)
  Other equity                                                   19            (155)                 155   (b)            19 
  Foreign currency translation adjustment                       109             -                    -                   109 
                                                            -------          ------               ------             ------- 
        Total stockholders' equity                           49,858             768               (4,103)             46,523 
                                                            -------          ------               ------             ------- 
        Total liabilities and stockholders' equity        $  58,909           1,289               (3,319)             56,879 
                                                            =======          ======               ======             =======  
</TABLE>
<PAGE>
 
                     NATURAL MICROSYSTEMS CORPORATION AND 
                 COMBINED PSR SYSTEMS, INC. AND TEKNIQUE, INC.

            Proforma Condensed Consolidated Statement of Operations

                       Three months ended March 31, 1996
                                  (Unaudited)
                     (In thousands except per share data)

<TABLE>
<CAPTION>
 
                                                       Natural       PSR Systems, Inc.                 
                                                     Microsystems     & TEKnique, Inc.     Pro forma         Pro forma
                                                     Corporation        Combined          Adjustments        Combined
                                                     -----------        --------          -----------        --------
<S>                                                  <C>                <C>               <C>                <C> 

Revenues                                              $  10,350           1,068               -                11,418
Cost of revenues                                          3,992             361               -                 4,353
                                                        -------          ------             -----             -------
                                                                                                                     
         Gross profit                                     6,358             707               -                 7,065
                                                                                                                     
Operating expenses:                                                                                                  
  Selling, general and administrative                     3,064             117                27  (d.2)             
                                                                                                9  (d.3)        3,217
  Research and development                                2,089             224               -                 2,313
                                                        -------          ------             -----             -------
                                                                                                                     
         Total operating expenses                         5,153             341                36               5,530
                                                        -------          ------             -----             -------

         Operating income (loss)                          1,205             366               (36)              1,535
                                                                                                                     
Interest income                                              84             -                 (44) (d.1)           40
Interest expense                                             (8)             (3)              -                   (11)
Other                                                         2             -                 -                     2
                                                        -------          ------             -----             -------
                                                              
         Other income (expense), net                         78              (3)              (44)                 31
                                                                                                                     
         Income (loss) before income taxes                1,283             363               (80)              1,566
                                                                                                                     
Income tax expense (benefit)                                430              86               (28) (d.7)          488
                                                        -------          ------             -----             -------
                                                                                                                     
         Net income                                   $     853             277               (52)              1,078
                                                        =======          ======             =====             =======
                                                                                                                     
Primary net income per common share                   $     .20                                                   .25
                                                        =======                                               =======
Primary weighted average shares outstanding               4,320                                                 4,361
                                                        =======                                               =======
Fully diluted net income per common share             $     .20                                                   .24
                                                        =======                                               =======
Fully diluted weighted average shares outstanding         4,360                                                 4,402 
                                                        =======                                               =======
</TABLE>
<PAGE>
 
                     NATURAL MICROSYSTEMS CORPORATION AND
                 COMBINED PSR SYSTEMS, INC. AND TEKNIQUE, INC.

            Proforma Condensed Consolidated Statement of Operations

                         Year ended December 31, 1995
                                  (Unaudited)
                     (In thousands except per share data)
<TABLE>
<CAPTION>
 
 
                                                        Natural     PSR Systems, Inc.
                                                      Microsystems   & TEKnique, Inc.    Pro forma        Pro forma
                                                      Corporation       Combined        Adjustments       Combined
                                                      -----------       --------        -----------       --------
<S>                                                   <C>               <C>             <C>               <C>   

Revenues                                               $  32,835          2,791            -                 35,626 
Cost of revenues                                          11,485          1,168            -                 12,653 
                                                         -------         ------        ------               ------- 
                                                                                                                    
         Gross profit                                     21,350          1,623            -                 22,973 
                                                                                                                    
Operating expenses:                                                                                                 
  Selling, general and administrative                     10,294          1,006            35   (d.5)               
                                                                                           41   (d.4)               
                                                                                          124   (d.6)               
                                                                                          108   (d.2)               
                                                                                           37   (d.3)        11,645 
  Research and development                                 6,856            416            35   (d.5)               
                                                                                          551   (d.4)               
                                                                                          124   (d.6)         7,982 
                                                         -------         ------        ------               ------- 
                                                                                                                    
         Total operating expenses                         17,150          1,422         1,055                19,627 
                                                         -------         ------        ------               ------- 
                                                                                                                    
         Operating income (loss)                           4,200            201        (1,055)                3,346 
                                                                                                                    
Merger costs                                              (1,911)           -                                (1,911)
Interest income                                              363            -            (178)  (d.1)           185 
Interest expense                                             (31)           (22)                                (53)
Other                                                          4            -                                     4 
                                                         -------         ------        ------               ------- 
                                                                                                                    
         Other income (expense), net                      (1,575)           (22)         (178)               (1,775)
                                                                                                                    
         Income (loss) before income taxes                 2,625            179        (1,233)                1,571 
                                                                                                                    
Income tax expense (benefit)                               1,350             54          (414)  (d.7)           990 
                                                         -------         ------        ------               ------- 
                                                                                                                    
         Net income                                    $   1,275            125          (819)                  581 
                                                         =======         ======        ======               ======= 
                                                                                                                    
Primary net income per common share                    $     .34                                                .15 
                                                         =======                                            ======= 
Primary weighted average shares outstanding                3,772                                              3,813 
                                                         =======                                            ======= 
Fully diluted net income per common share              $     .33                                                .15 
                                                         =======                                            ======= 
Fully diluted weighted average shares outstanding          3,848                                              3,890 
                                                         =======                                            =======  
</TABLE>
<PAGE>
 
                     NATURAL MICROSYSTEMS CORPORATION AND
                 COMBINED PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                         Notes to Pro Forma Condensed
                       Consolidated Financial Statements

                                March 31, 1996
                                  (Unaudited)
                     (In thousands except per share data)


(a) The following pro forma adjustments reflect Natural MicroSystems
    Corporation's ("NMS") purchase of 100% of the outstanding common stock of
    PSR Systems, Inc. and TEKnique, Inc. (together "TEKnique") and the
    consolidation by NMS of this acquisition.

<TABLE>
<CAPTION>
           <S>                                                         <C> 
           Cash paid by NMS                                            $  3,550
           Restricted common stock issued by NMS                          1,339
           Contingent purchase liability                                    500
           Transaction expenses                                             284
                                                                         ------

               Investment in TEKnique                                  $  5,673
                                                                         ======
</TABLE>

(b) The following pro forma adjustments are made to reflect estimated fair value
    adjustments at March 31, 1996 to eliminate NMS' investment in TEKnique:

<TABLE>
<CAPTION>
           <S>                                                         <C> 
           TEKnique net assets as reported:
             Common stock                                              $     13
             Other equity                                                  (155)
             Retained earnings                                              910
                                                                         ------
                                                                            768
 
           Fair value adjustments:
             Increase carrying amount of fixed assets                       186
             Goodwill                                                       293
             Purchased in process research and development                4,426
                                                                         ------ 
                                                                       $  5,673
                                                                         ======
</TABLE>
(c) The pro forma condensed combined balance sheet at March 31, 1996 reflects
    the purchased research and development as a charge directly to retained
    earnings (deficit).
<PAGE>
 
                     NATURAL MICROSYSTEMS CORPORATION AND
                 COMBINED PSR SYSTEMS, INC. AND TEKNIQUE, INC.

                         Notes to Pro Forma Condensed
                       Consolidated Financial Statements

                                March 31, 1996
                                  (Unaudited)
                     (In thousands except per share data)


(d) The following pro forma adjustments are incorporated in the pro forma
    condensed combined statements of operations:
<TABLE>
<CAPTION>
 
                                                                                            Three
                                                                            Year            Months
                                                                            Ended           Ended
                                                                         December 31,      March 31,
                                                                            1995             1996
                                                                            ----             ----
    <S>                                                                     <C>             <C> 

    1. Decrease in interest income resulting from the reduction of cash
          and cash equivalents, based upon average interest rates for
          the periods                                                       $ (178)          (44)
 
    2. Increase in amortization resulting from recording of goodwill          (108)          (27)
                                 
    3. Increase in depreciation resulting from adjustments to carrying 
          amounts of goodwill and other intangible assets                      (37)           (9)

    4. Increase in compensation expense for the effects of issuing
          common stock to employees immediately prior to the
          acquisition                                                         (551)

    5. Increase in compensation expense related to forgiveness of
          notes receivable - officers                                          (70)

    6. Increase in compensation expense related to distribution of
          cash value of officers' life insurance                              (248)

    7.  Decrease in tax expense resulting from the above adjustments          (414)          (28)
</TABLE> 

(e) Not included in the pro forma condensed combined statements of operations is
    the purchased in-process research and development. This charge of
    approximately $4,426 will be expensed in the second quarter of 1996.

(f) The pro forma condensed combined statements included herein include the
    financial statements of TEKnique as of and for the three months ended 
    April 30, 1996 and the year ended January 31, 1996 and NMS as of and for the
    three months ended March 31, 1996 and the year ended December 31, 1995.
<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 hereunto duly authorized.

                              NATURAL MICROSYSTEMS CORPORATION


Date:  August 9, 1996         By: /s/ John F. Kennedy
                              Name:   John F. Kennedy
                              Title:  Chief Financial Officer


                                       

<PAGE>
 
                                                        Exhibit 23.1
                                                        ------------

                               AUDITORS' CONSENT



The Board of Directors
PSR Systems, Inc. and TEKnique, Inc.:


We consent to incorporation by reference in the registration statements (Nos.
33-76324 and 333-09135) on Form S-8 of Natural MicroSystems Corporation of our
report dated June 14, 1996, relating to the combined balance sheets of PSR
Systems, Inc. and TEKnique, Inc. as of January 31, 1996 and 1995, and the
related combined statements of operations, stockholders' equity, and cash flows
for each of the years in the two-year period ended January 31, 1996, which
report appears in the amendment to Form 8-K of Natural MicroSystems Corporation
dated June 28, 1996.



                                             KPMG PEAT MARWICK LLP



Boston, Massachusetts
August 8, 1996


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