<PAGE>   1
                                                                   EXHIBIT 99.18

                     NOTICE OF CONVERSION PRICE ADJUSTMENT



<TABLE>
<CAPTION>
                                             Shares Out-
Number of                                   standing Prior      Shares         Aggregate      Price
Shares           Previous         Adjusted   to Issuance      Outstanding        Dollar       Paid        30 Day
Issued or       Conversion       Conversion  of Additional       After       Consideration     Per        Market
Issuable Shares    Price           Price        Shares         Issuance         Received      Share       Price 
---------------    -----           -----        ------         --------         --------      -----       ------
<S>              <C>           <C>            <C>              <C>            <C>             <C>         <C>
333,3331         $   259.69    $   256.99     2,214,541        2,547,874      $ 2,000,000     $ 6.00      $ 6.517

115,0002         $   256.99    $   255.50     2,547,874        2,662,874      $   600,000     $ 5.21      $ 6.029

172,5003         $   255.50    $   252.51     2,662,874        2,835,374      $   975,000     $ 5.65      $ 7.000

135,0004         $   252.51    $   250.12     2,835,374        2,970,374      $   810,000     $ 6.00      $ 7.579

4,1005           $   250.12    $   250.06     2,970,374        2,974,474      $    24,600     $ 6.00      $ 7.104

5,0006           $   250.06    $   249.97     2,974,474        2,979,474      $    30,000     $ 6.00      $ 7.750

10,8337          $   249.97    $   249.76     2,979,474        2,990,307      $    64,998     $ 6.00      $ 7.750

132,5608         $   249.76    $   248.12     2,990,307        3,122,867      $ 1,000,000     $ 7.54      $ 8.925
</TABLE>

______________________

         1       Shares of Common Stock issuable upon conversion of the Secured
                 Convertible Note dated January 9, 1996, at the original
                 conversion price of $6.00 per share, issued to Lindner Funds,
                 Inc.

         2       Shares of Common Stock issued under the Common Stock Purchase
                 Agreement dated February 1, 1996 between the Company and
                 Lindner Funds, Inc., at the price of $6.00 per share.

         3       Shares of Common Stock issued, at the price of $6.00 per
                 share, under the amended Common Stock Purchase Agreement dated
                 April 15, 1995 between the Company and James R. Moriarty.

         4       Shares of Common Stock issued, at the price of $6.00 per
                 share, under the Amended Common Stock Purchase Agreement dated
                 June 29, 1995 between the Company and Lindner Funds, Inc.

         5       Shares of Common Stock issued, at the price of $6.00 per
                 share, under the Common Stock Purchase Agreement dated July
                 29, 1995 between the Company and W.V.C. Limited.

         6       Shares of Common Stock issued, at the price of $6.00 per
                 share, under the Common Stock Purchase Agreement dated August
                 15, 1995 between the Company and BLC Investments.

         7       Shares of Common Stock issued, at the price of $6.00 per
                 share, under the Common Stock Purchase Agreement dated August
                 15, 1995 between the Company and The Helen Jean Quinn Family
                 Trust.

         8       Shares of Common Stock issued upon effectuation of the Secured
                 Conditional Exchangeable Note dated November 30, 1995, at a
                 price of approximately $7.54 per share issued to Dreyfus
                 Strategic Growth, L.P.

         The conversion price was adjusted for issuances of shares of Common
Stock for less consideration than the Market Price, as defined in the
Indenture, as well as issuances of securities convertible into or exchangeable
for shares of Common Stock for a consideration per share of Common Stock
(deliverable upon such conversion or exchange) that is less than the Market
Price, as defined in the Indenture.  Adjustments were calculated by (a)
dividing the aggregate dollar consideration received by the Company by the
Market Price, as defined in the Indenture, per share of outstanding Common
Stock, and (b) then adding this quotient to the number of shares of Common
Stock that were previously outstanding, and (c) then dividing said sum of
shares by the aggregate of all shares of common Stock that would be outstanding
or deemed outstanding pursuant to the Indenture, after the transaction
requiring the adjustment, including  the issuance of the actual amount of the
new shares to be issued or deemed to be issued in connection with the deemed
conversion or exchange of the new securities issued, and (d) then multiplying
this fraction by the conversion price as previously in effect.  See Sections
10.09 and 10.10 of the Indenture.