DENTAL MEDICAL DIAGNOSTIC SYSTEMS INC
8-K, 1999-12-08
DENTAL EQUIPMENT & SUPPLIES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                           ---------------------------

                                    Form 8-K

                                 CURRENT REPORT
                       PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

       Date of Report (Date of earliest event reported): November 23, 1999


                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.
             (Exact name of Registrant as Specified in Its Charter)


           DELAWARE                     0-12850                 13-3152648
       ----------------               -----------              -------------
  (State or Other Jurisdiction        (Commission              (IRS Employer
       of Incorporation)              File Number)           Identification No.)



                     200 North Westlake Boulevard, Suite 202
                       Westlake Village, California 91362
                    (Address of Principal Executive Offices)



                                 (805) 381-2700
           ----------------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)


                                       NA
           ----------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)


<PAGE>


ITEM 5. OTHER EVENTS

       On November 23, 1999, the Registrant sold to certain foreign-based
institutional investors an aggregate of 2,000 shares of Series A Exchangeable
Preferred Stock (the "Series A Shares"), 2,500 shares of Common Stock (the
"Common Shares") and Warrants to purchase up to 40,000 shares of Common Stock
(the "Warrants") for an aggregate purchase price of $2 million. The proceeds
will be used to finance increased inventory and for general working capital.

       The Series A Shares are nonvoting and receive an annual dividend of
$40.00, which dividends accrue daily and are payable quarterly on March 31, June
30, September 30 and December 31 of each year. The Series A Shares enjoy a
liquidation preference of $1,000 per share plus accrued and unpaid dividends.
Each Series A Share has a stated value of $1,000 per share and is exchangeable
into common stock (a) prior to March 15, 2000, at $4.00 per share and (b) on and
after March 15, 2000, the lesser of $4.00 per share or the average of the
closing bid prices of the common stock during any three (3) of the prior thirty
(30) consecutive trading days selected by the holder of the Series A Shares then
being exchanged. If the exchange price at the time of an exchange is less than
$6.00 per share, the Registrant has the option to pay the holder of the Series A
Shares then being exchanged an amount of cash equal to (i) the average of the
closing bid and asked prices on the date of the exchange, multiplied by (ii) the
number of shares of common stock that would otherwise be issuable upon exchange
of the Series A Shares then being exchanged. If (A) on or after November 16,
2002, or (B) at any time after March 15, 2000 the average of the closing bid
prices for the Registrant's common stock for twenty (20) consecutive trading
days is at least $8.00 per share and the average trading volume for thirty (30)
consecutive trading days is at least 50,000 shares, there remain issued and
outstanding any Series A Shares and a registration statement permitting the
resale by the holder of the Series A Shares the common stock into which such
Series A Shares may be exchanged is then effective, the Registrant shall be
entitled to require all holders of Series A Shares then outstanding to exchange
their Series A Shares for shares of common stock. The Registrant also has the
right to redeem the Series A Shares under certain circumstances.

       The investors also received Warrants to purchase an aggregate of 40,000
shares of Common Stock at $2.75 per share, exercisable at any time on or after
March 15, 2000 for a period of five (5) years.

       Reference is made to the press release of Registrant issued on December
3, 1999 which contains information meeting the requirements of this Item 5 and
is incorporated herein in its entirety by this reference. A copy of the press
release is attached to this Form 8-K as Exhibit 99.1.

RISK FACTORS

       AN INVESTMENT IN OUR SECURITIES INVOLVES A HIGH DEGREE OF RISK. BEFORE
DECIDING TO PURCHASE OR SELL OUR SECURITIES, IN ADDITION TO THE RISK FACTORS SET
FORTH IN OUR RECENTLY FILED


                                     Page 2
<PAGE>


QUARTERLY REPORT ON FORM 10-Q AND ANNUAL REPORT ON FORM 10-K, YOU SHOULD READ
AND CONSIDER CAREFULLY THE FOLLOWING RISK FACTORS.

OUR SALE OF SERIES A EXCHANGEABLE PREFERRED STOCK AND WARRANTS TO PURCHASE
COMMON STOCK MAY RESULT IN SUBSTANTIAL DILUTION TO OUR COMMON SHAREHOLDERS.

       On November 23, 1999 we sold an aggregate of 2,000 shares of Series A
Exchangeable Preferred Stock, 2,500 shares of Common Stock and Warrants to
purchase up to 40,000 shares of Common Stock.

       Prior to March 15, 2000, holders of Series A Exchangeable Preferred Stock
may exchange their shares into common stock at $4.00 per share based upon a
stated value of $1,000 per share of Series A Exchangeable Preferred Stock. On
and after March 15, 2000, holders of Series A Exchangeable Preferred Stock may
exchange their shares for shares of common stock at the lesser of $4.00 per
share or the average of the closing bid prices of the common stock during any
three (3) of the prior thirty (30) consecutive trading days selected by the
holder of the Series A Shares then being exchanged. As a result, after March 15,
2000 (or prior to March 15, 2000 if the trading price of our common stock
exceeds $4.00 per share) the holders of Series A Exchangeable Preferred Stock
will likely be in a position to exchange their shares for shares of common stock
at a discount to the then current trading price of our common stock.

A LARGE VOLUME OF SALES OF OUR COMMON STOCK RESULTING FROM THE EXCHANGE OF
SHARES OF SERIES A EXCHANGEABLE PREFERRED STOCK AND/OR THE EXERCISE OF WARRANTS
MAY RESULT IN DOWNWARD PRESSURE OR INCREASED VOLATILITY IN THE TRADING PRICE OF
OUR COMMON STOCK.

       On November 23, 1999 we sold an aggregate of 2,000 shares of Series A
Exchangeable Preferred Stock, 2,500 shares of Common Stock and Warrants to
purchase up to 40,000 shares of Common Stock.

       Because we have agreed to register for resale the 2,500 shares of Common
Stock and the shares of Common Stock issuable upon exchange or exercise of the
Series A Exchangeable Preferred Stock and the Warrants, the holders thereof may
sell without regard to any volume restrictions, including the volume
restrictions set forth in Rule 144 promulgated under the Securities Act of 1933.
As a result, sales by the holders of Series A Exchangeable Preferred Stock and
the Warrants could lead to an excess supply of shares of our Common Stock being
sold which could, in turn, result in downward pressure or increased volatility
in the trading price of our Common Stock.

IF WE FAIL TO TIMELY REGISTER FOR RESALE THE SHARES OF COMMON STOCK UNDERLYING
THE SERIES A EXCHANGEABLE PREFERRED STOCK AND THE WARRANTS, OR IF WE FAIL TO
TIMELY EFFECT AN EXCHANGE OF SERIES A EXCHANGEABLE PREFERRED STOCK FOR SHARES OF
COMMON STOCK, WE MAY BE LIABLE FOR SIGNIFICANT LIQUIDATED DAMAGES.


                                     Page 3
<PAGE>


       On November 23, 1999 we sold an aggregate of 2,000 shares of Series A
Exchangeable Preferred Stock, 2,500 shares of Common Stock and Warrants to
purchase up to 40,000 shares of Common Stock.

       We have agreed to register for resale the 2,500 shares of Common Stock
and the shares of Common Stock underlying the Series A Exchangeable Preferred
Stock and the Warrants. If we fail within sixty (60) days to file a registration
statement with the Securities and Exchange Commission, or if we fail to cause
the registration statement to become effective within ninety (90) days (120 days
if the SEC conducts a "full review" of the registration statement), we have
agreed to pay liquidated damages to the purchasers of the Series A Exchangeable
Preferred Stock an aggregate of 1% of the total market value of the Common
Stock, including Common Stock into which the outstanding shares of Series A
Exchangeable Preferred Stock may be exchanged, for each week that we have either
failed to file a registration statement or failed to cause the registration
statement to become effective. An obligation to pay these liquidated damages
could have a material adverse effect on our liquidity and cash flows.

       In addition, we have agreed to effect an exchange of Series A
Exchangeable Preferred Stock into Common Stock within four (4) trading days of
receipt of a notice from a holder of Series A Exchangeable Preferred Stock
requesting an exchange. If we fail to effect an exchange of Series A
Exchangeable Preferred Stock into Common Stock within four (4) trading days of
receipt of a valid notice, we have agreed to pay to the holder of Series A
Exchangeable Preferred Stock requesting the exchange liquidated damages in an
amount equal to $100 per day for the first ten (10) days and $200 per day
thereafter for each $5,000 in liquidation preference amount then being
exchanged. An obligation to pay these liquidated damages could have a material
adverse effect on our liquidity and cash flows.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

       (c) EXHIBITS

3.1    Certificate of Designations, Preferences and Rights of Series A
       Exchangeable Preferred Stock of the Registrant.

10.1   Exchangeable Preferred Stock and Warrants Purchase Agreement, dated as of
       October 25, 1999, by and among the Registrant and the several investors
       set forth therein.

10.2   Form of Stock Purchase Warrant, dated as of October 25, 1999.

10.3   Registration Rights Agreement, dated as of October 25, 1999, by and among
       the Registrant and the several investors set forth therein.

99.1   Press release issued December 3, 1999.


                                     Page 4
<PAGE>


                                   SIGNATURES

       Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the Registrant has duly caused this Current Report on Form 8-K to be
signed on its behalf by the undersigned hereunto duly authorized.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


Dated: December 7, 1999                By:  /S/ STEPHEN F. ROSS
                                             -----------------------------------
                                             Stephen F. Ross
                                             Chief Financial Officer


                                     Page 5
<PAGE>


                                  EXHIBIT INDEX


EXHIBIT NO.                  DESCRIPTION OF EXHIBIT

3.1    Certificate of Designations, Preferences and Rights of Series A
       Exchangeable Preferred Stock of the Registrant

10.1   Exchangeable Preferred Stock and Warrants Purchase Agreement, dated as of
       October 25, 1999, by and among the Registrant and the several investors
       set forth therein.

10.2   Form of Stock Purchase Warrant, dated as of October 25, 1999.

10.3   Registration Rights Agreement, dated as of October 25, 1999, by and among
       the Registrant and the several investors set forth therein.

99.1   Press release issued December 3, 1999.


                                     Page 6



                                                                     EXHIBIT 3.1
                          CERTIFICATE OF DESIGNATIONS,

                            PREFERENCES AND RIGHTS OF

                    SERIES A EXCHANGEABLE PREFERRED STOCK OF

                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

                             PURSUANT TO SECTION 151

                     OF THE DELAWARE GENERAL CORPORATION LAW



       The undersigned, being the Chief Executive Officer and the Secretary of
Dental/Medical Diagnostic Systems, Inc., a corporation organized and existing
under and by virtue of the laws of the State of Delaware (hereinafter the
"Corporation"), DO HEREBY CERTIFY:

       FIRST: That pursuant to authority expressly granted and vested in the
Board of Directors of said Corporation by the provisions of the Corporation's
Certificate of Incorporation, said Board of Directors adopted the following
resolution on November 9, 1999 determining the designations, preferences and
rights of its Series A Exchangeable Preferred Stock:

       RESOLVED: That pursuant to the authority vested in the Board of Directors
of the Corporation by the Corporation's Certificate of Incorporation, as amended
and restated (the "Certificate of Incorporation"), a series of Preferred Stock
of the Corporation be, and it hereby is, created out of the authorized but
unissued shares of the capital stock of the Corporation, such series to be
designated Series A Exchangeable Preferred Stock (the "Series A Exchangeable
Preferred Stock"), to consist of 2,000 shares, par value $0.01 per share, of
which the preferences and relative and other rights, and the qualifications,
limitations or restrictions thereof, shall be as set forth in the Certificate of
Designations annexed hereto:

       1. NUMBER OF SHARES OF SERIES A EXCHANGEABLE PREFERRED STOCK. Of the
1,000,000 shares of authorized but unissued Preferred Stock, $0.01 par value
("Preferred Stock") of the Corporation, two thousand (2,000) shares shall be
designated and known as Series A Exchangeable Preferred Stock, par value $0.01
per share ("Series A Exchangeable Preferred Stock").

       2. VOTING.

              (a) Unless required by law, no holder of any shares of Series A
       Exchangeable Preferred Stock shall be entitled to vote at any meeting of
       stockholders of the Corporation (or any written actions of stockholders
       in lieu of meetings) with respect to any matters presented to the
       stockholders of the Corporation for their action or consideration.
       Notwithstanding the foregoing, the Corporation shall provide each holder
       of record of Series A Exchangeable Preferred Stock with


<PAGE>


       timely notice of every meeting of stockholders of the Corporation and
       shall provide each holder with copies of all proxy materials distributed
       in connection therewith.

              (b) So long as shares of Series A Exchangeable Preferred Stock are
       outstanding, the Corporation shall not, without first obtaining the
       approval (by vote or written consent, as provided by the Delaware General
       Corporation Law) of the holders of at least 75% in interest of the then
       outstanding shares of Series A Exchangeable Preferred Stock sold to the
       original purchasers thereof pursuant to the Exchangeable Preferred Stock
       and Warrant Purchase Agreement referred to in Section 13 hereof:

                     (i) alter or change the rights, preferences or privileges
              of the Series A Exchangeable Preferred Stock;

                     (ii) create any new class or series of capital stock having
              a preference over the Series A Exchangeable Preferred Stock as to
              distribution of assets upon liquidation, dissolution or winding up
              of the Corporation ("Senior Securities") or alter or change the
              rights, preferences or privileges of any Senior Securities so as
              to affect adversely the Series A Exchangeable Preferred Stock;

                     (iii) increase the authorized number of shares of Series A
              Exchangeable Preferred Stock; or

                     (iv) do any act or thing not authorized or contemplated by
              this Certificate of Designations which would result in taxation of
              the holders of shares of the Series A Exchangeable Preferred Stock
              under Section 305 of the Internal Revenue Code of 1986, as amended
              (or any comparable provision of the Internal Revenue Code as
              hereafter from time to time amended).

       In the event such holders of at least 75% in interest of the then
outstanding shares of Series A Exchangeable Preferred Stock agree to allow the
Corporation to alter or change the rights, preferences or privileges of the
shares of Series A Exchangeable Preferred Stock, pursuant to subsection (b)
above, so as to affect the Series A Exchangeable Preferred Stock, then the
Corporation will deliver notice of such approved change to the holders of the
Series A Exchangeable Preferred Stock that did not agree to such alteration or
change (the "Dissenting Holders") and Dissenting Holders shall have the right,
but not the obligation, for a period of thirty (30) days to exchange any and all
shares of then held Series A Exchangeable Preferred Stock pursuant to the terms
of this Certificate of Designation as in effect prior to such alteration or
change.

       3. DIVIDENDS.

       The holders of shares of Series A Exchangeable Preferred Stock shall be
entitled to receive, before any cash dividend shall be declared and paid upon or
set aside for the Common Stock in any fiscal year of the Corporation, out of
funds legally available for that purpose, cumulative dividends payable in cash
or in registered shares of Common Stock (at the sole election of the
Corporation) in an amount per share of Series A Exchangeable Preferred Stock
outstanding for such fiscal year equal to $40.00. Such dividends shall accrue
daily and be payable quarterly on March 31, June 30, September 30 and December
31 of each year. In the event that the Corporation shall elect to


                                   EX 3.1 - 2
<PAGE>


pay any such dividend payment in the form of Common Stock, such Common Stock
shall be valued at the Market Price on the dividend payment date, as defined in
Section 5 below.

       4. LIQUIDATION. (a) If the Corporation shall commence a voluntary case
under the Federal bankruptcy laws or any other applicable Federal or State
bankruptcy, insolvency or similar law, or consent to the entry of an order for
relief in an involuntary case under any law or to the appointment of a receiver,
liquidator, assignee, custodian, trustee, sequestrator (or other similar
official) of the Corporation or of any substantial part of its property, or make
an assignment for the benefit of its creditors, or admit in writing its
inability to pay its debts generally as they become due, or if a decree or order
for relief in respect of the Corporation shall be entered by a court having
jurisdiction in the premises in an involuntary case under the Federal bankruptcy
laws or any other applicable Federal or State bankruptcy, insolvency or similar
law resulting in the appointment of a receiver, liquidator, assignee, custodian,
trustee, sequestrator (or other similar official) of the Corporation or of any
substantial part of its property, or ordering the winding up or liquidation of
its affairs, and any such decree or order shall be unstayed and in effect for a
period of ninety (90) consecutive days and, on account of any such event, the
Corporation shall liquidate, dissolve or wind up, or if the Corporation shall
otherwise liquidate, dissolve or wind up (each such event being considered a
"Liquidating Event"), no distribution shall be made to the holders of any shares
of capital stock of the Corporation other than Senior Securities upon
liquidation, dissolution or winding up unless prior thereto, the holders of
shares of Series A Exchangeable Preferred Stock shall have received the
Liquidation Preference (as defined in Section 4(c)) with respect to each share.
If upon the occurrence of a Liquidation Event, the assets and funds available
for distribution among the holders of the Series A Exchangeable Preferred Stock
and holders of securities ranking pari passu as to preference upon liquidation
with the Series A Exchangeable Preferred Stock shall be insufficient to permit
the payment to such holders of the preferential amounts payable thereon, then
the entire assets and funds of the Corporation legally available for
distribution to the Series A Exchangeable Preferred Stock and such pari passu
securities shall be distributed ratably among such shares in proportion to the
ratio that that Liquidation Preference payable on each such share bears to the
aggregate Liquidation Preference payable on all such shares.

              (b) At the option of each holder, the sale, conveyance of
       disposition of all or substantially all of the assets of the Corporation,
       the effectuation by the Corporation of a transaction or series or related
       transactions in which more than 50% of the voting power of the
       Corporation is disposed of, or the consolidation, merger or other
       business combination of the Corporation with or into any other person or
       persons when the Corporation is not the survivor shall be deemed to be a
       liquidation, dissolution or winding up of the Corporation pursuant to
       which the Corporation shall be required to distribute, upon consummation
       of and as a condition to such transaction an amount equal to the
       Liquidation Preference with respect to each outstanding share of Series A
       Exchangeable Preferred Stock held by such holder in accordance with and
       subject to the terms of this Section 4.

              (c) The Liquidation Preference shall be the Stated Value of $1,000
       per share of Series A Exchangeable Preferred Stock plus all accrued but
       unpaid dividends.

       5. OPTIONAL EXCHANGE. The holders of shares of Series A Exchangeable
Preferred Stock shall have the following exchange rights:


                                   EX 3.1 - 3
<PAGE>


              (a) RIGHT TO EXCHANGE; EXCHANGE PRICE. Subject to the terms,
       conditions, and restrictions of this Section 5, the holder of any shares
       of Series A Exchangeable Preferred Stock shall have the right to exchange
       each such share of Series A Exchangeable Preferred Stock (except that
       upon any liquidation of the Corporation, the right of exchange shall
       terminate at the close of business on the business day fixed for payment
       of the amount distributable on the Series A Exchangeable Preferred Stock)
       for an amount of shares of Common Stock equal to the Stated Value of such
       share or shares of Series A Exchangeable Preferred Stock divided by (i)
       during the one hundred twenty one (121) day period following the Original
       Issuance Date, Four Dollars ($4.00) (the "Set Price") and (ii) on and
       after the 122nd day after the Original Issuance Date, the lesser of the
       Set Price or the average of the closing bid prices as reported by
       Bloomberg L.P., on the principal market for the Corporation's Common
       Stock based on trading volume (the "Principal Market") during any three
       (3) trading days selected by the Holder out of the period of thirty (30)
       consecutive trading days ending with the last trading day prior to the
       date of exchange (the "Exchange Date") (the "Market Price"), to determine
       the exchange price (the "Exchange Price"). However, in no event shall the
       Exchange Price be greater than the Set Price (the "Maximum Exchange
       Price"). In addition, if the Exchange Price on any Exchange Date is less
       than $6.00 (adjusted for any splits, reverse splits or dividends in the
       form of shares of Common Stock after the Original Issuance Date), then
       the Corporation shall have the option, upon at least three (3) trading
       days' prior written notice to all holders of its intention to do so, to
       pay the holder in cash in an amount equal to (i) the average of the
       closing bid and asked prices on the Principal Market on the Exchange Date
       multiplied by (ii) the number of shares of Common Stock which would
       otherwise be issuable to the holder upon such exchange. If notice of the
       Corporation's election to pay the holder in cash is not received by the
       holder prior to three trading days before the receipt by the Corporation
       of an Exchange Notice, the Corporation shall issue to the holder shares
       of Common Stock unless otherwise agreed to by the holder. Unless the
       Corporation shall have obtained the approval of its voting stockholders
       to such issuance in accordance with the rules of the Principal Market,
       the Corporation shall not issue shares of Common Stock upon exchange of
       any shares of Series A Exchangeable Preferred Stock if such issuance of
       Common Stock, when added to the number of shares of Common Stock
       previously issued by the Corporation upon exchange of shares of the
       Series A Exchangeable Preferred Stock or upon exercise of the Warrants
       issued in connection with the issuance of the Series A Exchangeable
       Preferred Stock, would exceed 19.9% of the number of shares of the
       Corporation's Common Stock which were issued and outstanding on the
       Original Issuance Date; and, in such event, or if the Corporation does
       not have registered shares of Common Stock available with which to honor
       Exchanges, the Corporation shall honor such exchange request in cash in
       accordance with the previous sentence, irrespective of the Exchange
       Price, and the holder shall be a creditor of the Corporation in respect
       of such sum. The right to exchange shares of Series A Exchangeable
       Preferred Stock shall be pro-rated among the original purchasers of such
       shares or their respective subsequent transferees, if any, in order to
       comply with the aforesaid overall limitation. Any exchange which is paid
       in cash shall be paid within three (3) business days of the Exchange
       Date, or else the late delivery payments set forth in Section 5(d)(ii)
       hereof shall apply to such late payment, and, upon demand of the holder
       in such event of late delivery, the holder may require the Corporation to
       deliver the shares otherwise issuable upon such exchange.

              (b) EXCHANGE DATE. (i) The holder of any shares of Series A
       Exchangeable Preferred Stock may exchange such shares immediately after
       the date upon which such shares of


                                   EX 3.1 - 4
<PAGE>


       Series A Preferred Stock were originally issued (the "Original Issuance
       Date"); provided, that the Corporation shall have the right, on no more
       than three (3) occasions during the life the Series A Exchangeable
       Preferred Stock, by at least two (2) trading days' prior written notice
       to the holders, to refuse to honor any Exchange Notice delivered during
       any specified seven (7) calendar day period.

                     (ii) In no event shall a holder be permitted to exchange
              any shares of Series A Exchangeable Preferred Stock in excess of
              the number of such shares upon the exchange of which, (x) the
              number of shares of Common Stock owned by such holder (other than
              shares of Common Stock issuable upon exchange of shares of Series
              A Exchangeable Preferred Stock) plus (y) the number of shares of
              Common Stock issuable upon such exchange of such shares of Series
              A Exchangeable Preferred Stock, would be equal to or exceed 9.9%
              of the number of shares of Common Stock then issued and
              outstanding, including shares issuable upon exchange of the Series
              A Exchangeable Preferred Stock held by such holder after
              application of this Section 5(b)(ii). As used herein, beneficial
              ownership shall be determined in accordance with Section 13(d) of
              the Securities Exchange Act of 1934, as amended, and the rules and
              regulations thereunder. To the extent that the limitation
              contained in this Section 5(b)(ii) applies, the determination of
              whether shares of Series A Exchangeable Preferred Stock are
              exchangeable (in relation to other securities owned by holder) and
              of which shares of Series A Exchangeable Preferred Stock are
              exchangeable shall be in the sole discretion of such holder, and
              the submission of shares of Series A Exchangeable Preferred Stock
              for exchange shall be deemed to be such holder's determination of
              whether such shares of Series A Exchangeable Preferred Stock are
              exchangeable (in relation to other securities owned by such
              holder) and of which shares of Series A Exchangeable Preferred
              Stock are exchangeable, in each case subject to such aggregate
              percentage limitation, and the Corporation shall have no
              obligation to verify or confirm the accuracy of such
              determination, and shall have no liability to holder with respect
              thereto. Nothing contained herein shall be deemed to restrict the
              right of a holder to exchange such shares of Series A Exchangeable
              Preferred Stock at such time as such exchange will not violate the
              provisions of this paragraph. The provisions of this Section
              5(b)(ii) may be waived by a holder of Series A Exchangeable
              Preferred Stock as to itself (and solely as to itself) upon (A)
              not less than 75 days' prior notice to the Corporation, and the
              provisions of this Section 5(b)(ii) shall continue to apply until
              such 75th day (or such later date as may be specified in such
              notice of waiver) or (B) not less than three (3) days' prior
              notice to the Corporation if and only if the Corporation shall
              have breached or defaulted upon one or more of its obligations to
              the holder pursuant to this Certificate of Designation. No
              exchange in violation of this paragraph but otherwise in
              accordance with this Certificate of Designation shall affect the
              status of the Common Stock issued upon such exchange as validly
              issued, fully-paid and nonassessable.

              (c) NOTICE OF EXCHANGE. The right of exchange shall be exercised
       by the holder thereof by giving written notice (the "Exchange Notice") to
       the Corporation, by facsimile or by registered mail or overnight delivery
       service, with a copy by facsimile to the Corporation's then transfer
       agent for its Common Stock, as designated by the Corporation from time to
       time, that the holder elects to exchange a specified number of shares of
       Series A Exchangeable Preferred Stock representing a specified Stated
       Value thereof for Common Stock and, if such exchange will result in the
       exchange of all of such holder's shares of Series A Exchangeable
       Preferred Stock, by surrender of a certificate or certificates for the
       shares so to be Exchanged to the Corporation at its principal office (or
       such other office or agency of the Corporation as the Corporation may
       designate by notice in writing to the holders of the Series A
       Exchangeable Preferred Stock) at any time during its usual


                                   EX 3.1 - 5
<PAGE>


       business hours on the date set forth in the Exchange Notice, together
       with a statement of the name or names (with address) in which the
       certificate or certificates for shares of Common Stock shall be issued.
       The Exchange Notice shall include therein the Stated Value of shares of
       Series A Exchangeable Preferred Stock to be Exchanged, and a calculation,
       if applicable, (i) of the Market Price, (ii) the Exchange Price, and
       (iii) the number of shares of Common Stock to be issued in connection
       with such Exchange.

              (d) ISSUANCE OF CERTIFICATES; TIME EXCHANGE EFFECTED. (i)
       Promptly, but in no event more than three business days, after the
       receipt of the Exchange Notice referred to in Section 5(c) and surrender
       of the certificate or certificates for the share or shares of Series A
       Exchangeable Preferred Stock to be exchanged (if required), the
       Corporation shall issue and deliver, or cause to be issued and delivered,
       to the holder, registered in such name or names as such holder may
       direct, a certificate or certificates for the number of whole shares of
       Common Stock for which such shares of Series A Exchangeable Preferred
       Stock are exchanged. To the extent permitted by law, such exchange shall
       be deemed to have been effected on the date on which such Exchange Notice
       shall have been received by the Corporation and at the time specified
       stated in such Exchange Notice, which must be during the calendar day of
       such notice, and at such time the rights of the holder of such share or
       shares of Series A Exchangeable Preferred Stock shall cease, and the
       person or persons in whose name or names any certificate or certificates
       for shares of Common Stock shall be issuable upon such exchange shall be
       deemed to have become the holder or holders of record of the shares
       represented thereby. Issuance of shares of Common Stock issuable upon
       exchange which are requested to be registered in a name other than that
       of the registered holder shall be subject to compliance with all
       applicable federal and state securities laws. In the event that the
       Corporation elects to pay cash in lieu of issuing Common Stock in
       accordance with Section 5(a) hereof, such cash payment shall be made on
       or before the third business day after receipt of an Exchange Notice.

                     (ii) The Corporation cannot refuse to effect the exchange
              of the Series A Exchangeable Preferred Stock into Common Shares or
              otherwise dishonor or reject any Exchange Notice delivered in
              accordance with this Section 5 based upon any claim that a holder
              or any person associated or affiliate with such holder has been
              engaged in any violation of law or for any other reason, unless an
              injunction from a court or regulatory body, on notice, restraining
              or enjoining the exchange of all or some of such shares of Series
              A Exchangeable Preferred Stock shall have issued and the
              Corporation shall have posted a surety bond for the benefit of the
              holder or holder so affected in the amount of the difference
              between the Exchange Price and the closing ask price on the
              trading day preceding the date of the attempted exchange,
              multiplied by the number of shares of Common Stock which would
              have been issuable upon such exchange, which bond shall remain in
              effect until the completion of the arbitration or litigation of
              the dispute and the proceeds of which shall be payable to the
              affected holder or holders in the event its obtains a favorable
              judgment. If any third party who is not and has never been an
              Affiliate (as defined in Rule 405 under the Securities Act of
              1933, as amended) of the holder obtains a judgment or any
              injunctive relief from any court or public or governmental
              authority which denies, enjoins, limits, modifies, delays or
              disputes the right of the holder hereof to effect the exchange of
              the Series A Exchangeable Preferred Stock into Common Shares, then
              the holder shall also have the right, by written notice to the
              Corporation, to require the Corporation to promptly redeem the
              Series A Exchangeable Preferred Stock for cash at a redemption
              price equal to one hundred twenty five percent (125%) of the
              Stated Value thereof (the "Mandatory Purchase Amount"). Under any
              of the circumstances set forth above, the Corporation shall be


                                   EX 3.1 - 6
<PAGE>


              responsible for the payment of all costs and expenses of the
              holder, including reasonable legal fees and expenses, as and when
              incurred in disputing any such action or pursuing its rights
              hereunder (in addition to any other rights of the holder). In the
              absence of an injunction precluding the same, the Corporation
              shall issue shares upon a properly noticed exchange.

                     (iii) The holder shall be entitled to exercise its exchange
              privilege notwithstanding the commencement of any case under 11
              U.S.C. ss. 101 ET SEQ. (the "Bankruptcy Code"). In the event the
              Corporation is a debtor under the Bankruptcy Code, the Corporation
              hereby waives to the fullest extent permitted any rights to relief
              it may have under 11 U.S.C. ss. 362 in respecT of the holder's
              exchange privilege. The Corporation hereby waives to the fullest
              extent permitted any rights to relief it may have under 11 U.S.C.
              ss. 362 in respect of the exchange of the Series A Exchangeable
              Preferred Stock. The Corporation agrees, without cost or expense
              to the holder, to take or consent to any and all action necessary
              to effectuate relief under 11 U.S.C. ss. 362.

              (e) FRACTIONAL SHARES. No fractional shares shall be issued upon
       exchange of Series A Exchangeable Preferred Stock for Common Stock. All
       fractional shares shall be payable in cash at the closing price per share
       on the business day prior to the day such payment is accrued. All
       exchanges pursuant to Section 5 or Section 6 hereof by any holder shall
       be aggregated so that in no event shall any single holder receive a cash
       payment in lieu of fractional shares pursuant to this subsection for a
       fraction greater than or equal to one (1).

              (f) REORGANIZATION OR RECLASSIFICATION. If any capital
       reorganization or reclassification of the capital stock of the
       Corporation shall be effected in such a way that holders of Common Stock
       shall be entitled to receive stock, securities or assets with respect to
       or in exchange for Common Stock, or, in the case of any consolidation,
       merger or mandatory share exchange of the Corporation into any other
       company, then, as a condition of such reorganization, reclassification or
       exchange, lawful and adequate provisions shall be made whereby each
       holder of a share or shares of Series A Exchangeable Preferred Stock
       shall thereupon have the right to receive, upon the basis and upon the
       terms and conditions specified herein and in lieu of the shares of Common
       Stock immediately theretofore receivable upon the exchange of such share
       or shares of Series A Exchangeable Preferred Stock, such shares of stock,
       securities or assets as may be issued or payable with respect to or in
       exchange for a number of outstanding shares of such Common Stock equal to
       the number of shares of such Common Stock immediately theretofore
       receivable upon such exchange had such reorganization, reclassification
       or exchange not taken place, and in any such case appropriate provisions
       shall be made with respect to the rights and interests of such holder to
       the end that the provisions hereof (including without limitation
       provisions for adjustments of the exchange rights) shall thereafter be
       applicable, as nearly as may be, in relation to any shares of stock,
       securities or assets thereafter deliverable upon the exercise of such
       exchange rights.

              (g) ADJUSTMENTS FOR SPLITS, COMBINATIONS, ETC. The Set Price and
       the number of shares of Common Stock into which the Series A Exchangeable
       Preferred Stock shall be Exchangeable shall be adjusted for stock splits,
       stock dividends, combinations or other similar events. No adjustment to
       the Exchange Price will be made for dividends (other than stock
       dividends), if any, paid on the Common Stock or for securities issued
       pursuant to exercise for fair value of options, warrants or restricted
       stock.


                                   EX 3.1 - 7
<PAGE>


       6. MANDATORY EXCHANGE.

              (a) MANDATORY EXCHANGE DATE. If (i) on or after the third year
       anniversary of the Original Issuance Date of any share of Series A
       Exchangeable Preferred Stock, or (ii) at any time on or after the 122nd
       day after such Original Issuance Date if the average of the closing bid
       prices for the Corporation's Common Stock on the Principal Market for
       twenty consecutive trading days ending on the trading day prior to the
       date provided for herein is at least $8.00 per share (adjusted for any
       splits or reverse splits) and the average daily trading volume on the
       Principal Market for the thirty trading days ending on the trading day
       prior to the date provided for herein is at least 50,000 shares (such
       date as selected by the Corporation being the "Mandatory Exchange Date"),
       there remain issued and outstanding any shares of Series A Exchangeable
       Preferred Stock and a registration statement permitting the resale by the
       holder of the Common Stock issuable upon such exchange is then effective
       and remains effective through the Mandatory Exchange Date, then the
       Corporation shall be entitled to require all (but not less than all)
       holders of shares of Series A Exchangeable Preferred Stock then
       outstanding to exchange their shares of Series A Exchangeable Preferred
       Stock for shares of Common Stock at the then effective Exchange Price
       pursuant to Section 5(a). The Corporation shall provide at least three
       (3) trading days' written notice (the "Mandatory Exchange Notice") to the
       holders of shares of Series A Exchangeable Preferred Stock of such
       mandatory exchange. The Mandatory Exchange Notice shall include (i) the
       Stated Value of the shares of Series A Exchangeable Preferred Stock to be
       exchanged, (ii) the Exchange Price (which for purposes of this subsection
       6(a), shall be the lesser of (A) the Set Price and (B) the average of the
       three lowest closing bid prices as reported by Bloomberg LP on the
       Principal Market during the prior thirty (30) consecutive trading days
       immediately prior to the Mandatory Exchange Date) at the Mandatory
       Exchange Date, and (iii) the number of shares of the Corporation's Common
       Stock to be issued upon such mandatory exchange at the then applicable
       Exchange Price. In lieu of a Mandatory Exchange, the Corporation may
       buy-out the shares of Series A Exchangeable Preferred Stock by means of
       such Mandatory Exchange Notice. The amount of cash to be paid in the
       event of a buy-out shall equal the average of the closing bid and asked
       prices of the Common Stock on the business day prior to the Mandatory
       Exchange Date times the number of shares which would have been issued
       upon a voluntary Exchange, but in no event shall such buy-out price yield
       the holder a total return on its investment of less than forty percent
       (40%). Notwithstanding the foregoing, in no event shall the Corporation
       exchange that portion of the Series A Exchangeable Preferred Stock to the
       extent that the issuance of Common Stock upon the exchange of such Series
       A Exchangeable Preferred Stock, when combined with shares of Common Stock
       received upon other exchanges of Series A Exchangeable Preferred Stock by
       such holder and any other holders of Series A Exchangeable Preferred
       Stock or upon exercise of the Stock Purchase Warrants referred to in
       Section 5(a), would exceed 19.9% of the Common Stock outstanding on the
       Original Issuance Date (unless stockholder approval has been obtained as
       described in Section 5(a)), or as to any individual holder, make such
       holder the beneficial owner of 9.9% or more of the Corporation's
       then-outstanding Common Stock.

              (b) SURRENDER OF CERTIFICATES. On or before the Mandatory Exchange
       Date, each holder of shares of Series A Exchangeable Preferred Stock
       shall surrender his or its certificate or certificates for all such
       shares to the Corporation at the place designated in such Mandatory
       Exchange Notice (or an affidavit of lost certificate in form and content
       reasonably satisfactory to the Corporation), and shall thereafter receive
       certificates for the number of shares of Common Stock to which such
       holder is entitled or, in the event of a buy-out by the Corporation, the
       amount of cash


                                   EX 3.1 - 8
<PAGE>


       such holder is entitled within three business days. On the Mandatory
       Exchange Date, all rights with respect to the Series A Exchangeable
       Preferred Stock so exchanged, including the rights, if any, to receive
       notices and vote, will terminate, provided that the Corporation either
       (i) delivers the shares of Common Stock to be delivered upon such
       Exchange within five (5) business days of the Mandatory Exchange Date or
       (ii) in the event of a buy-out in lieu of a Mandatory Exchange, delivers
       the buy-out price within five (5) business days of the Mandatory Exchange
       Date, and otherwise such Mandatory Exchange shall be void and the
       Corporation shall not thereafter have any further right to require a
       Mandatory Exchange. All certificates evidencing shares of Series A
       Exchangeable Preferred Stock that are required to be surrendered for
       Exchange in accordance with the provisions hereof, from and after the
       Mandatory Exchange Date, shall be deemed to have been retired and
       cancelled, notwithstanding the failure of the holder or holders thereof
       to surrender such certificates on or prior to such date. The Corporation
       may thereafter take such appropriate action as may be necessary to reduce
       the authorized Series A Exchangeable Preferred Stock accordingly.

       7. REDEMPTION OF SERIES A EXCHANGEABLE PREFERRED STOCK.

              (a) RIGHT TO REDEEM SERIES A EXCHANGEABLE PREFERRED STOCK. At any
       time and from time to time upon the earlier of (i) the financial closing
       of an underwritten public offering of the Corporation's Common Stock or
       (ii) six months after the Original Issuance Date, the Corporation may, in
       its sole discretion, but shall not be obligated to, redeem, in whole or
       in part, the then issued and outstanding shares of Series A Exchangeable
       Preferred Stock, at a price equal to 140% of the Stated Value, plus all
       accrued but unpaid dividends through the Redemption Date, unless the
       closing bid price on the Principal Market on the Redemption Date is less
       than the Market Price on the Original Issuance Date, in which event the
       Redemption Price shall be 125% of the Stated Value plus all accrued but
       unpaid dividends. In the event that the Corporation's Common Stock shall
       cease to be listed or quoted on a national securities exchange or The
       Nasdaq Stock Market, or a registration statement permitting resales by
       the holders of Exchange Shares is not effective within 180 days of the
       Original Issuance Date, then the Corporation shall, within fifteen (15)
       days of demand by any holder, redeem all of such holder's outstanding
       shares of Series A Exchangeable Preferred Stock at a price equal to 125%
       of the Stated Value, plus all accrued but unpaid dividends thereon
       through the Redemption Date. Such requested redemption shall be mandatory
       and the requesting holder of Series A Exchangeable Preferred Stock shall,
       from and after the Redemption Date, be a creditor of the Corporation for
       such purpose.

              (b) NOTICE OF REDEMPTION. The Corporation shall provide each
       holder of record of the Series A Exchangeable Preferred Stock being
       redeemed with written notice of redemption (the "Redemption Notice") not
       less than 10 days prior to any date stipulated by the Corporation for the
       redemption of the Series A Exchangeable Preferred Stock (the "Redemption
       Date"). The Redemption Notice shall contain (i) the Redemption Date, (ii)
       the number of shares of Series A Exchangeable Preferred Stock to be
       redeemed from the holder to whom the Redemption Notice is delivered,
       (iii) instructions for surrender to the Corporation of the certificate or
       certificates representing the shares of Series A Exchangeable Preferred
       Stock to be redeemed, and (iv) a procedure for the holder to specify the
       number of shares of Series A Exchangeable Preferred Stock to be exchanged
       into Common Stock pursuant to Section 5, subject to the limitation set
       forth in Section 7(c).


                                   EX 3.1 - 9
<PAGE>


              (c) RIGHT TO EXCHANGE SERIES A EXCHANGEABLE PREFERRED STOCK UPON
       RECEIPT OF REDEMPTION NOTICE. Upon receipt of the Redemption Notice, the
       recipient thereof shall have the option, at its sole election, to specify
       what portion of the Series A Exchangeable Preferred Stock called for
       redemption in the Redemption Notice shall be redeemed as provided in this
       Section 7 or exchanged for Common Stock in the manner provided in Section
       5 and limited to those shares which would otherwise be exchangeable
       pursuant to Section 5(b). If the holder of the Series A Exchangeable
       Preferred Stock called for redemption elects to exchange any of such
       shares then eligible for exchange, then such exchange shall take place on
       the Exchange Date specified by the holder, but in no event after the
       Redemption Date, in accordance with the terms of Section 5.

              (d) SURRENDER OF CERTIFICATES; PAYMENT OF REDEMPTION PRICE. On or
       before the Redemption Date, each holder of the shares of Series A
       Exchangeable Preferred Stock to be redeemed shall surrender the required
       certificate or certificates representing such shares to the Corporation
       (or an affidavit of lost certificate in form and content reasonably
       satisfactory to the Corporation), in the manner and at the place
       designated in the Redemption Notice, and upon payment to the holder of
       the Redemption Price, each such surrendered certificate shall be
       cancelled and retired. If payment of such redemption price is not made in
       full by the Redemption Date, the Corporation's right to redeem any Series
       A Exchangeable Preferred Stock shall cease and be void, and the Holder
       shall again have the right to exchange the Series A Exchangeable
       Preferred Stock as provided in Section 5 hereof. If a certificate is
       surrendered and all the shares evidenced thereby are not being redeemed,
       the Corporation shall issue new certificates to be registered in the
       names of the person(s) whose name(s) appear(s) as the owners on the
       respective surrendered certificates and deliver such certificate to such
       person(s).

       8. NOTICES. In case at any time:

              (a) the Corporation shall declare any dividend upon its Common
       Stock payable in cash or stock or make any other pro rata distribution to
       the holders of its Common Stock; or

              (b) the Corporation shall offer for subscription PRO RATA to the
       holders of its Common Stock any additional shares of stock of any class
       or other rights; or

              (c) there shall be any capital reorganization or reclassification
       of the capital stock of the Corporation, or a consolidation or merger of
       the Corporation with or into, or a sale of all or substantially all its
       assets to, another entity or entities; or

              (d) there shall be a voluntary or involuntary dissolution,
       liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or facsimile or by recognized overnight
delivery service to non-U.S. residents, addressed to each holder of any shares
of Series A Exchangeable Preferred Stock at the address of such holder as shown
on the books of the Corporation, (i) at least twenty (20) business days' prior
written notice of the date on which the books of the Corporation shall close or
a record shall be taken for such dividend, distribution or subscription rights
or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up


                                  EX 3.1 - 10
<PAGE>


and (ii) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least
twenty (20) business days' prior written notice of the date when the same shall
take place. Such notice in accordance with the foregoing clause (i) shall also
specify, in the case of any such dividend, distribution or subscription rights,
the date on which the holders of Common Stock shall be entitled thereto and (ii)
shall also specify the date on which the holders of Common Stock shall be
entitled to exchange their Common Stock for securities or other property
deliverable upon such reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding up, as the case may be.

       9. STOCK TO BE RESERVED. The Corporation, upon the effective date of this
Certificate of Designations, has a sufficient number of shares of Common Stock
available to reserve for issuance upon the exchange of all outstanding shares of
Series A Exchangeable Preferred Stock. The Corporation will at all times reserve
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the exchange of Series A Exchangeable Preferred Stock as herein
provided, such number of shares of Common Stock as shall then be issuable upon
the exchange of all outstanding shares of Series A Exchangeable Preferred. The
Corporation covenants that all shares of Common Stock which shall be so issued
shall be duly and validly issued, fully paid and non-assessable. The Corporation
will take all such action as may be so taken without violation of any applicable
law or regulation, or of any requirement of any national securities exchange
upon which the Common Stock may be listed to have a sufficient number of
authorized but unissued shares of Common Stock to issue upon exchange of the
Series A Exchangeable Preferred Stock. The Corporation will not take any action
which results in any adjustment of the exchange rights if the total number of
shares of Common Stock issued and issuable after such action upon exchange of
the Series A Exchangeable Preferred Stock would exceed the total number of
shares of Common Stock then authorized by the Corporation's Certificate of
Incorporation.

       10. NO REISSUANCE OF SERIES A EXCHANGEABLE PREFERRED STOCK. Shares of
Series A Exchangeable Preferred Stock which are exchanged for shares of Common
Stock as provided herein shall not be reissued.

       11. ISSUE TAX. The issuance of certificates for shares of Common Stock
upon exchange of Series A Exchangeable Preferred Stock shall be made without
charge to the holder for any United States issuance tax in respect thereof,
provided that the Corporation shall not be required to pay any tax which may be
payable in respect of any transfer involved in the issuance and delivery of any
certificate in a name other than that of the holder of the Series A Exchangeable
Preferred Stock which is being exchanged.

       12. CLOSING OF BOOKS. The Corporation will at no time close its transfer
books against the transfer of any Series A Exchangeable Preferred Stock or of
any shares of Common Stock issued or issuable upon the exchange of any shares of
Series A Exchangeable Preferred Stock in any manner which interferes with the
timely exchange of such Series A Exchangeable Preferred Stock, except as may
otherwise be required to comply with applicable securities laws.

       13. DEFINITIONS. As used in this Certificate of Designations, the term
"Common Stock" shall mean and include the Corporation's authorized Common Stock,
$0.001 par value per share, as constituted on the date of filing of these terms
of the Series A Exchangeable Preferred Stock, and


                                  EX 3.1 - 11
<PAGE>


shall also include any capital stock of any class of the Corporation thereafter
authorized which shall neither be limited to a fixed sum or percentage of par
value in respect of the rights of the holders thereof to participate in
dividends nor entitled to a preference in the distribution of assets upon the
voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Common Stock receivable upon exchange
of shares of Series A Exchangeable Preferred Stock shall include only shares
designated as Common Stock of the Corporation on the date of filing of this
instrument, or in case of any reorganization, reclassification, or stock split
of the outstanding shares thereof, the stock, securities or assets provided for
in Subparagraph 5(f) and (g). Any capitalized terms used in this Certificate of
Designations but not defined herein shall have the meanings set forth in that
certain Exchangeable Preferred Stock and Warrant Purchase Agreement dated as of
October 25, 1999 among the Corporation and the other persons signatory thereto,
a copy of which will be provided to any stockholder of the Corporation upon
request to the Secretary of the Corporation, without charge.

       14. LOSS, THEFT, DESTRUCTION OF PREFERRED STOCK. Upon receipt of evidence
satisfactory to the Corporation of the loss, theft, destruction or mutilation of
certificates representing shares of Series A Exchangeable Preferred Stock and,
in the case of any such loss, theft or destruction, upon receipt of indemnity or
security reasonably satisfactory to the Corporation, or, in the case of any such
mutilation, upon surrender and cancellation of the Series A Exchangeable
Preferred Stock certificate, the Corporation shall make, issue and deliver, in
lieu of such lost, stolen, destroyed or mutilated certificates for Series A
Exchangeable Preferred Stock, new certificates for Series A Exchangeable
Preferred Stock of like tenor. The Series A Exchangeable Preferred Stock shall
be held and owned upon the express condition that the provisions of this Section
14 are exclusive with respect to the replacement of mutilated, destroyed, lost
or stolen shares of Series A Preferred Stock and shall preclude any and all
other rights and remedies notwithstanding any law or statue existing or
hereafter enacted to the contrary with respect to the replacement of negotiable
instruments or other securities without the surrender thereof.

       15. WHO DEEMED ABSOLUTE OWNER. The Corporation may deem the person in
whose name the Series A Exchangeable Preferred Stock shall be registered upon
the registry books of the Corporation to be, and may treat it as, the absolute
owner of the Series A Exchangeable Preferred Stock for the purpose of exchange
of the Series A Exchangeable Preferred Stock and for all other purposes, and the
Corporation shall not be affected by any notice to the contrary. All such
payments and such exchange shall be valid and effectual to satisfy and discharge
the liability upon the Series A Exchangeable Preferred Stock to the extent of
the sum or sums so paid or the exchange so made.

       16. REGISTER. The Corporation shall maintain a transfer agent, which may
be the transfer agent for the Common Stock, for the registration of the Series A
Exchangeable Preferred Stock. Upon any transfer of the Series A Exchangeable
Preferred Stock in accordance with the provisions hereof, the Corporation shall
register or cause the transfer agent to register such transfer on the Series A
Exchangeable Preferred Stock register.

       17. WITHHOLDING. To the extent required by applicable law, the
Corporation may withhold amounts for or on account of any taxes imposed or
levied by or on behalf of any taxing authority in the United States having
jurisdiction over the Corporation from any payments made pursuant to the Series
A Exchangeable Preferred Stock.


                                  EX 3.1 - 12
<PAGE>


       18. HEADINGS. The headings of the Sections of this Certificate of
Designations are inserted for convenience only and do not constitute a part of
this Certificate of Designations.

       IN WITNESS WHEREOF, Robert H. Gurevitch, President and Chief Executive
Officer of the Corporation, under penalties of perjury, does hereby declare and
certify that this is the act and deed of the Corporation and the facts stated
herein are true and accordingly has signed this Certificate of Designations as
of this 10th day of November, 1999.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


                                        By:  /S/ ROBERT H. GUREVITCH
                                             -----------------------------------
                                             Robert H. Gurevitch, President and
                                             Chief Executive Officer


Attest:


By:  /S/ ROBERT H. GUREVITCH
     -----------------------------------
     Robert H. Gurevitch, Secretary


                                  EX 3.1 - 13





                                                                    EXHIBIT 10.1


          EXCHANGEABLE PREFERRED STOCK AND WARRANTS PURCHASE AGREEMENT

                                     BETWEEN

                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

                                       AND

                         THE INVESTORS SIGNATORY HERETO


       EXCHANGEABLE PREFERRED STOCK AND WARRANTS PURCHASE AGREEMENT dated as of
October 25, 1999 (the "Agreement"), between the Investors signatory hereto (each
an "Investor" and together the "Investors"), and Dental/Medical Diagnostic
Systems, Inc., a corporation organized and existing under the laws of the State
of Delaware (the "Company").

       WHEREAS, the parties desire that, upon the terms and subject to the
conditions contained herein, the Company shall issue and sell to the Investors,
and the Investors shall purchase in the aggregate, (i) $2,000,000 Stated Value
of Exchangeable Preferred Stock (as defined below), (ii) Warrants (as defined
below) to purchase up to 40,000 shares of the Common Stock (as defined below) at
130% of the Market Price on the Closing Date for such Common Stock, and (iii)
2,500 shares of Common Stock.

       WHEREAS, such investments will be made in reliance upon the provisions of
Section 4(2) ("Section 4(2)") and/or 4(6) of the United States Securities Act
and/or Regulation D ("Regulation D") and the other rules and regulations
promulgated thereunder (the "Securities Act"), and/or upon such other exemption
from the registration requirements of the Securities Act as may be available
with respect to any or all of the investments in securities to be made
hereunder.

       NOW, THEREFORE, the parties hereto agree as follows:

                                   ARTICLE I

                               CERTAIN DEFINITIONS

Section 1.1. "CAPITAL SHARES" shall mean the Common Stock and any shares of any
other class of common stock whether now or hereafter authorized, having the
right to participate in the distribution of earnings and assets of the Company.

Section 1.2. "CAPITAL SHARES EQUIVALENTS" shall mean any securities, rights, or
obligations that are convertible into or exchangeable for or give any right to
subscribe for any Capital Shares of the Company or any Warrants, options or
other rights to subscribe for or purchase Capital Shares or any such convertible
or exchangeable securities.

Section 1.3. "CERTIFICATE OF DESIGNATIONS" shall mean the Certificate of
Designations setting forth the terms of the Exchangeable Preferred Stock in the
form of Exhibit A hereto.

Section 1.4. "CLOSING" shall mean the closing of the purchase and sale of the
Exchangeable Preferred Stock, Common Stock and Warrants pursuant to Section 2.1.


<PAGE>


Section 1.5. "CLOSING DATE" shall mean the date on which all conditions to the
Closing have been satisfied (as defined in Section 2.1 (b) hereto) and the
Closing shall have occurred.

Section 1.6. "COMMON STOCK" shall mean the Company's common stock, $0.01 par
value per share.

Section 1.7. "DAMAGES" shall mean any loss, claim, damage, judgment, penalty,
deficiency, liability, costs and expenses (including, without limitation,
reasonable attorney's fees and disbursements and reasonable costs and expenses
of expert witnesses and investigation).

Section 1.8. "EFFECTIVE DATE" shall mean the date on which the SEC first
declares effective a Registration Statement registering the resale of the
Registrable Securities as set forth in the Registration Rights Agreement.

Section 1.9. "ESCROW AGENT" shall have the meaning set forth in the Escrow
Agreement.

Section 1.10. "ESCROW AGREEMENT" shall mean the Escrow Agreement in
substantially the form of Exhibit D hereto executed and delivered
contemporaneously with this Agreement.

Section 1.11. "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder.

Section 1.12. "EXCHANGE SHARES" shall mean the shares of Common Stock issuable
upon exchange of the Exchangeable Preferred Stock and any shares of Common Stock
issued as dividends upon the Exchangeable Preferred Stock.

Section 1.13. "EXCHANGEABLE PREFERRED STOCK" shall mean the up to $2,000,000
Stated Value (2,000 shares) of Series A Exchangeable Preferred Stock, as
described in the Certificate of Designations to be issued to the Investors
pursuant to this Agreement.

Section 1.14. "LEGEND" shall mean the legend set forth in Section 9.1.

Section 1.15. "MARKET PRICE" on any given date shall mean the average of any
three (3) closing bid prices on the Principal Market (as reported by Bloomberg
L.P.) of the Common Stock selected by the Investor during the thirty (30)
Trading Day period ending on the Trading Day immediately prior to the date for
which the Market Price is to be determined.

Section 1.16. "MATERIAL ADVERSE EFFECT" shall mean any effect on the business,
operations, properties, prospects, stock price or financial condition of the
Company that is material and adverse to the Company and its subsidiaries and
affiliates, taken as a whole, and/or any condition, circumstance, or situation
that would prohibit or otherwise interfere with the ability of the Company to
enter into and perform any of its obligations under this Agreement, the
Registration Rights Agreement, the Escrow Agreement, the Certificate of
Designations or the Warrants in any material respect.

Section 1.17. "OUTSTANDING" when used with reference to shares of Common Stock
or Capital Shares (collectively the "Shares"), shall mean, at any date as of
which the number of such Shares is to be determined, all issued and outstanding
Shares, and shall include all such Shares issuable in respect of outstanding
scrip or any certificates representing fractional interests in such Shares;
PROVIDED, HOWEVER, that "Outstanding" shall not mean any such Shares then
directly or indirectly owned or held by or for the account of the Company.

Section 1.18. "PERSON" shall mean an individual, a corporation, a partnership, a
limited liability company, an association, a trust or other entity or
organization, including a government or political subdivision or an agency or
instrumentality thereof.


                                   EX 10.1 - 2
<PAGE>


Section 1.19. "PRINCIPAL MARKET" shall mean the American Stock Exchange, the New
York Stock Exchange, the NASDAQ National Market, or the NASDAQ Small-Cap Market,
whichever is at the time the principal trading exchange or market for the Common
Stock, based upon share volume.

Section 1.20. "PURCHASE PRICE" shall mean the Stated Value per share of
Exchangeable Preferred Stock, as defined in the Certificate of Designations, net
of a five percent (5%) discount.

Section 1.21. "REGISTRABLE SECURITIES" shall mean the Exchange Shares, the
Common Stock issued to the Investors at the Closing and the Warrant Shares until
(i) the Registration Statement has been declared effective by the SEC, and all
Exchange Shares and Warrant Shares have been disposed of pursuant to the
Registration Statement, (ii) all Exchange Shares and Warrant Shares have been
sold under circumstances under which all of the applicable conditions of Rule
144 (or any similar provision then in force) under the Securities Act ("Rule
144") are met, (iii) all Exchange Shares and Warrant Shares have been otherwise
transferred to holders who may trade such shares without restriction under the
Securities Act, and the Company has delivered a new certificate or other
evidence of ownership for such securities not bearing a restrictive legend or
(iv) such time as, in the opinion of counsel to the Company, all Exchange Shares
and Warrant Shares may be sold without any time, volume or manner limitations
pursuant to Rule 144(k) (or any similar provision then in effect) under the
Securities Act.

Section 1.22. "REGISTRATION RIGHTS AGREEMENT" shall mean the agreement regarding
the filing of the Registration Statement for the resale of the Registrable
Securities, entered into between the Company and the Investor as of the Closing
Date in the form annexed hereto as Exhibit C.

Section 1.23. "REGISTRATION STATEMENT" shall mean a registration statement on
Form S-3 (if use of such form is then available to the Company pursuant to the
rules of the SEC and, if not, on such other form promulgated by the SEC for
which the Company then qualifies and which counsel for the Company shall deem
appropriate, and which form shall be available for the resale by the Investors
of the Registrable Securities to be registered thereunder in accordance with the
provisions of this Agreement, the Registration Rights Agreement and in
accordance with the intended method of distribution of such securities), for the
registration of the resale by the Investor of the Registrable Securities under
the Securities Act.

Section 1.24. "REGULATION D" shall have the meaning set forth in the recitals of
this Agreement.

Section 1.25. "SEC" shall mean the Securities and Exchange Commission.

Section 1.26. "SECTION 4(2)" AND "SECTION 4(6)" shall have the meanings set
forth in the recitals of this Agreement.

Section 1.27. "SECURITIES ACT" shall have the meaning set forth in the recitals
of this Agreement.

Section 1.28. "SEC DOCUMENTS" shall mean the Company's Annual Report on Form
10-KSB for the fiscal year ended December 31, 1998 and each report, proxy
statement or registration statement filed by the Company with the SEC pursuant
to the Exchange Act or the Securities Act since the filing of such Annual Report
through the date hereof, and shall include each Company press release which is
specifically identified in the Disclosure Letter referenced in the preamble to
Article IV.

Section 1.29. "SHARES" shall have the meaning set forth in Section 1.16.

Section 1.30. "STATED VALUE" shall have the meaning set forth in the Certificate
of Designations.

Section 1.31. "TRADING DAY" shall mean any day during which the Principal Market
shall be open for business.


                                   EX 10.1 - 3
<PAGE>


Section 1.32. "WARRANTS" shall mean the Warrants substantially in the form of
Exhibit B to be issued to the Investors hereunder.

Section 1.33. "WARRANT SHARES" shall mean all shares of Common Stock or other
securities issued or issuable pursuant to exercise of the Warrants.

                                   ARTICLE II

         PURCHASE AND SALE OF EXCHANGEABLE PREFERRED STOCK AND WARRANTS

Section 2.1. INVESTMENT.

       (a) Upon the terms and subject to the conditions set forth herein, the
Company agrees to sell, and the Investors agree, severally and not jointly, to
purchase the Exchangeable Preferred Stock together with the Common Stock and the
Warrants at the Purchase Price. On the Closing Date, the Investors shall
purchase $2,000,000 (2,000 shares) of Exchangeable Preferred Stock as follows:

              (i) Upon execution and delivery of this Agreement, each Investor
       shall deliver to the Escrow Agent immediately available funds in their
       proportionate amount of the Purchase Price as set forth on the signature
       pages hereto, and the Company shall deliver the Exchangeable Preferred
       Stock certificates, an aggregate of 2,500 shares of Common Stock (in the
       names and amounts set forth on Schedule I to this Agreement), and the
       Warrants to the Escrow Agent, in each case to be held by the Escrow Agent
       pursuant to the Escrow Agreement.

              (ii) Upon satisfaction of the conditions set forth in Section
       2.1(b), the Closing ("Closing") shall occur at the offices of the Escrow
       Agent at which the Escrow Agent (x) shall release the Exchangeable
       Preferred Stock, the Common Stock and the Warrants to the Investors and
       (y) shall release the Purchase Price, pursuant to the terms of the Escrow
       Agreement.

       (b) The Closing is subject to the satisfaction, or waiver by the party to
be benefited thereby, of the following conditions:

              (i) acceptance and execution by the Company and by the Investors,
       of this Agreement and all Exhibits hereto;

              (ii) delivery into escrow by each Investor of immediately
       available funds in the amount of the Purchase Price of the Exchangeable
       Preferred Stock, the Common Stock and the Warrants, as more fully set
       forth in the Escrow Agreement (as a condition to the Company's
       obligations);

              (iii) all representations and warranties of the Investors
       contained herein shall remain true and correct as of the Closing Date (as
       a condition to the Company's obligations);

              (iv) all representations and warranties of the Company contained
       herein shall remain true and correct as of the Closing Date and the
       Disclosure Letter shall reveal no Material Adverse Effect (as a condition
       to the Investors' obligations);

              (v) the Company shall have obtained all permits and qualifications
       required by any state for the offer and sale of the Exchangeable
       Preferred Stock, the Common Stock and Warrants, or shall have the
       availability of exemptions therefrom;


                                   EX 10.1 - 4
<PAGE>


              (vi) the sale and issuance of the Exchangeable Preferred Stock,
       the Common Stock and the Warrants hereunder, and the proposed issuance by
       the Company to the Investors of the Common Stock underlying the
       Exchangeable Preferred Stock and the Warrants upon the exchange or
       exercise thereof shall be legally permitted by all laws and regulations
       to which the Investors and the Company are subject and there shall be no
       ruling, judgment or writ of any court prohibiting the transactions
       contemplated by this Agreement;

              (vii) delivery of the original fully executed Exchangeable
       Preferred Stock certificates, Common Stock certificates and Warrants
       certificates to the Escrow Agent;

              (viii) delivery to the Escrow Agent of an opinion of Troop Steuber
       Pasich Reddick & Tobey, LLP, counsel to the Company, in the form of
       Exhibit E hereto;

              (ix) delivery to the Escrow Agent of the Irrevocable Instructions
       to Transfer Agent in the form attached hereto as Exhibit F;

              (x) delivery to the Escrow Agent of the Registration Rights
       Agreement; and

              (xi) delivery to the Escrow Agent of the written agreements of
       each officer and director of the Company addressed to the Investors,
       agreeing to vote all shares of Common Stock over which they have voting
       control in favor of a shareholder proposal permitting the issuance of a
       number of Exchange Shares in excess of 19.9% of the number of shares of
       Common Stock issued and outstanding on the Closing Date.

Section 2.2. LIQUIDATED DAMAGES. The Company understands that a delay in the
issuance of the Exchange Shares beyond three Trading Days after delivery by an
Investor of an Exchange Notice could result in economic loss to the Investor. As
compensation to the Investor for such loss, the Company agrees to pay late
payments to the Investor for late issuance of shares of Common Stock upon
exchange in accordance with the following schedule (where "NO. TRADING DAYS
LATE" is defined as the number of Trading Days beyond four (4) Trading Days from
the date of receipt by the Company of the Exchange Notice):

<TABLE>
<CAPTION>
        No. Trading Days Late                    Late Payment For Each
                                            $5,000 of Liquidation Preference
                                                Amount Being Exchanged
      ------------------------             ----------------------------------

                 <S>                          <C>
                   1                                        $100
                   2                                        $200
                   3                                        $300
                   4                                        $400
                   5                                        $500
                   6                                        $600
                   7                                        $700
                   8                                        $800
                   9                                        $900
                  10                                      $1,000
                 >10                          $1,000 + $200 for each Trading Day
                                                     Late beyond 10 days
</TABLE>

The Company shall pay any payments incurred under this Section in immediately
available funds upon demand. Nothing herein shall limit the Investor's right to
pursue injunctive relief and/or actual


                                   EX 10.1 - 5
<PAGE>


damages for the Company's failure to issue and deliver Common Stock to the
Investor, including, without limitation, the Investor's actual losses occasioned
by any "buy-in" of Common Stock necessitated by such late delivery. Furthermore,
in addition to any other remedies which may be available to the Investor, in the
event that the Company fails for any reason to effect delivery of such shares of
Common Stock within five Trading Days the date of receipt of the Exchange
Notice, the holder will be entitled to revoke the relevant Exchange Notice by
delivering a notice to such effect to the Company whereupon the Company and the
holder shall each be restored to their respective positions immediately prior to
delivery of such Exchange Notice.

The parties hereto acknowledge and agree that the sums payable pursuant to the
foregoing paragraph and pursuant to the Registration Rights Agreement shall
constitute liquidated damages and not penalties. The parties further acknowledge
that (a) the amount of loss or damages likely to be incurred is incapable or is
difficult to precisely estimate, (b) the amounts specified in such Sections bear
a reasonable proportion and are not plainly or grossly disproportionate to the
probable loss likely to be incurred by the Investors in connection with the
failure by the Company to timely cause the registration of the Registrable
Securities and (c) the parties are sophisticated business parties and have been
represented by sophisticated and able legal and financial counsel and negotiated
this Agreement at arm's length.

                                   ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF INVESTOR

Each Investor, severally and not jointly, represents and warrants to the Company
that:

Section 3.1. INTENT. The Investor is entering into this Agreement for its own
account and not with a view to or for sale in connection with any distribution
of the Common Stock. The Investor has no present arrangement (whether or not
legally binding) at any time to sell the Exchangeable Preferred Stock, the
Warrants, any Exchange Shares or Warrant Shares to or through any person or
entity except in compliance with the Securities Act or an exemption therefrom;
provided, however, that by making the representations herein, the Investor does
not agree to hold such securities for any minimum or other specific term and
reserves the right to dispose of the Exchange Shares and Warrant Shares at any
time in accordance with federal and state securities laws applicable to such
disposition.

Section 3.2. SOPHISTICATED INVESTOR. The Investor is a sophisticated investor
(as described in Rule 506(b)(2)(ii) of Regulation D) and an accredited investor
(as defined in Rule 501 of Regulation D), and Investor has such experience in
business and financial matters that it has the capacity to protect its own
interests in connection with this transaction and is capable of evaluating the
merits and risks of an investment in the Exchangeable Preferred Stock, the
Warrants and the underlying Common Stock. The Investor acknowledges that an
investment in the Exchangeable Preferred Stock, the Warrants and the underlying
Common Stock is speculative and involves a high degree of risk.

Section 3.3. AUTHORITY. This Agreement and each agreement attached as an Exhibit
hereto which is required to be executed by Investor has been duly authorized and
validly executed and delivered by the Investor and is a valid and binding
agreement of the Investor enforceable against it in accordance with its terms,
subject to applicable bankruptcy, insolvency, or similar laws relating to, or
affecting generally the enforcement of, creditors' rights and remedies or by
other equitable principles of general application.

Section 3.4. NOT AN AFFILIATE. The Investor is not an officer, director or
"affiliate" (as that term is defined in Rule 405 of the Securities Act) of the
Company.


                                   EX 10.1 - 6
<PAGE>


Section 3.5. ABSENCE OF CONFLICTS. The execution and delivery of this Agreement
and each agreement which is attached as an Exhibit hereto and executed by the
Investor in connection herewith, and the consummation of the transactions
contemplated hereby and thereby, and compliance with the requirements hereof and
thereof by the Investor, will not violate any law, rule, regulation, order,
writ, judgment, injunction, decree or award binding on Investor or (a) violate
any provision of any indenture, instrument or agreement to which Investor is a
party or is subject, or by which Investor or any of its assets is bound; (b)
conflict with or constitute a material default thereunder; (c) result in the
creation or imposition of any lien pursuant to the terms of any such indenture,
instrument or agreement, or constitute a breach of any fiduciary duty owed by
Investor to any third party; or (d) require the approval of any third-party
(which has not been obtained) pursuant to any material contract, agreement,
instrument, relationship or legal obligation to which Investor is subject or to
which any of its assets, operations or management may be subject.

Section 3.6. DISCLOSURE; ACCESS TO INFORMATION. The Investor has received all
documents, records, books and other publicly available information pertaining to
Investor's investment in the Company that have been requested by the Investor.
The Company is subject to the periodic reporting requirements of the Exchange
Act, and the Investor has reviewed copies of all SEC Documents deemed relevant
by Investor.

Section 3.7. MANNER OF SALE. At no time was Investor presented with or solicited
by or through any leaflet, public promotional meeting, television advertisement
or any other form of general solicitation or advertising.

Section 3.8. NO BROKERS. The Investor has not employed any investment banker,
broker, finder, or intermediary in connection with the transactions contemplated
by this Agreement who will seek a fee from the Company. The Investor agrees to
indemnify and hold harmless the Company from and against any and all liabilities
to any person claiming brokerage commissions or finder's fees on account of
services purported to have been rendered on behalf of the Investor in connection
with this Agreement or the transactions contemplated hereby.

                                   ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

The Company represents and Warrants to the Investors that, except as set forth
in a Disclosure Letter prepared by the Company and delivered to the Investor
concurrent with the execution of this Agreement (which Disclosure Letter may be
updated by the Company at any time prior to Closing) (the "Disclosure Letter"):

Section 4.1. ORGANIZATION OF THE COMPANY. The Company is a corporation duly
incorporated and existing in good standing under the laws of the State of
Delaware and has all requisite corporate authority to own its properties and to
carry on its business as now being conducted. The Company does not have any
subsidiaries and does not own more that fifty percent (50%) of or control any
other business entity except as set forth in the SEC Documents. The Company is
duly qualified and is in good standing as a foreign corporation to do business
in every jurisdiction in which the nature of the business conducted or property
owned by it makes such qualification necessary, other than those in which the
failure so to qualify would not have a Material Adverse Effect.

Section 4.2. AUTHORITY. (i) The Company has the requisite corporate power and
corporate authority to enter into and perform its obligations under this
Agreement, the Registration Rights Agreement, the Escrow Agreement, and the
Warrants and to issue the Common Stock, the Exchangeable Preferred Stock, the


                                   EX 10.1 - 7
<PAGE>


Exchange Shares, the Warrants and the Warrant Shares pursuant to their
respective terms, (ii) the execution, issuance and delivery of this Agreement,
the Registration Rights Agreement, the Escrow Agreement, the Certificate of
Designations, the Common Stock, the Exchangeable Preferred Stock certificates
and the Warrants by the Company and the consummation by it of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
and no further consent or authorization of the Company or its Board of Directors
or stockholders is required, and (iii) this Agreement, the Registration Rights
Agreement, the Escrow Agreement, the Exchangeable Preferred Stock certificates
and the Warrants have been duly executed and delivered by the Company and at the
Closing shall constitute valid and binding obligations of the Company
enforceable against the Company in accordance with their terms, except as such
enforceability may be limited by applicable bankruptcy, insolvency, or similar
laws relating to, or affecting generally the enforcement of, creditors' rights
and remedies or by other equitable principles of general application. The
Company has duly and validly authorized and reserved for issuance shares of
Common Stock sufficient in number for the exchange of the Exchangeable Preferred
Stock and for the exercise of the Warrants. The Company understands and
acknowledges the potentially dilutive effect to the Common Stock of the issuance
of the Exchange Shares. The Company further acknowledges that its obligation to
issue Exchange Shares upon exchange of the Exchangeable Preferred Stock and
Warrant Shares upon exercise of the Warrants in accordance with this Agreement
and the Certificate of Designations is absolute and unconditional regardless of
the dilutive effect that such issuance may have on the ownership interests of
other stockholders of the Company and notwithstanding the commencement of any
case under 11 U.S.C. ss. 101 et seq. (the "Bankruptcy Code"). The Company shall
not seek judicial relief from its obligations hereunder except pursuant to the
Bankruptcy Code. In the event the Company is a debtor under the Bankruptcy Code,
the Company hereby waives to the fullest extent permitted any rights to relief
it may have under 11 U.S.C. ss. 362 in respect of the exchange of the
Exchangeable Preferred Stock and the exercise of the Warrants. The Company
agrees, without cost or expense to the Investors, to take or consent to any and
all action necessary to effectuate relief under 11 U.S.C. ss. 362.

Section 4.3. CAPITALIZATION. The authorized capital stock of the Company
consists of 20,000,000 shares of Common Stock, $0.01 par value per share, of
which 6,344,998 shares are issued and outstanding as of September 30, 1999 and
1,000,000 shares of preferred stock, par value $0.01 per share, none of which
have been designated as to series or are issued and outstanding prior to the
Closing. The Company has duly and validly designated 2,000 shares of its
preferred stock as Series A Exchangeable Preferred Stock. Except for (i)
outstanding options and warrants as set forth in the SEC Documents and (ii) as
set forth in the Disclosure Schedule, there are no outstanding Capital Shares
Equivalents nor any agreements or understandings pursuant to which any Capital
Shares Equivalents may become outstanding. The Company is not a party to any
agreement granting registration or anti-dilution rights to any person with
respect to any of its equity or debt securities. All of the outstanding shares
of Common Stock of the Company have been duly and validly authorized and issued
and are fully paid and non-assessable.

Section 4.4. COMMON STOCK. The Company has registered its Common Stock pursuant
to Section 12(b) or (g) of the Exchange Act and is in full compliance with all
reporting requirements of the Exchange Act, and the Company is in compliance
with all requirements for the continued listing or quotation of its Common
Stock, and such Common Stock is currently listed or quoted on, the Principal
Market. As of the date hereof, the Principal Market is the Nasdaq SmallCap
Market and the Company has not received any notice regarding, and to its
knowledge there is no threat, of the termination or discontinuance of the
eligibility of the Common Stock for such listing.

Section 4.5. SEC DOCUMENTS. The Company has made available to the Investors true
and complete copies of the SEC Documents. The Company has not provided to the
Investors any information that, according to applicable law, rule or regulation,
should have been disclosed publicly prior to the date hereof by the Company, but
which has not been so disclosed. As of their respective dates, the SEC Documents
complied in all material respects with the requirements of the Exchange Act, and
rules and regulations of the SEC


                                   EX 10.1 - 8
<PAGE>


promulgated thereunder and the SEC Documents did not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading. The financial
statements of the Company included in the SEC Documents complied in all material
respects with applicable accounting requirements and the published rules and
regulations of the SEC or other applicable rules and regulations with respect
thereto at the time of such inclusion. Such financial statements have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis during the periods involved (except (i) as may be otherwise
indicated in such financial statements or the notes thereto or (ii) in the case
of unaudited interim statements, to the extent they exclude footnotes or may be
condensed or summary statements) and fairly present in all material respects the
financial position of the Company as of the dates thereof and the results of
operations and cash flows for the periods then ended (subject, in the case of
unaudited interim statements, to normal year-end audit adjustments). Neither the
Company nor any of its subsidiaries has any material indebtedness, obligations
or liabilities of any kind (whether accrued, absolute, contingent or otherwise,
and whether due or to become due) that would have been required to be reflected
in, reserved against or otherwise described in the financial statements or in
the notes thereto in accordance with GAAP, which was not fully reflected in,
reserved against or otherwise described in the financial statements or the notes
thereto included in the SEC Documents or was not incurred in the ordinary course
of business consistent with the Company's past practices since the last date of
such financial statements.

Section 4.6. EXEMPTION FROM REGISTRATION; VALID ISSUANCES. Subject to the
accuracy of the Investors' representations in Article III, the sale of the
Common Stock, the Exchangeable Preferred Stock, the Exchange Shares, the
Warrants and the Warrant Shares will not require registration under the
Securities Act and/or any applicable state securities law. When issued and paid
for in accordance with the Warrants and validly exchanged in accordance with the
terms of the Exchangeable Preferred Stock, the Exchange Shares and the Warrant
Shares will be duly and validly issued, fully paid, and non-assessable. Neither
the sales of the Common Stock, the Exchangeable Preferred Stock, the Exchange
Shares, the Warrants or the Warrant Shares pursuant to, nor the Company's
performance of its obligations under, this Agreement, the Registration Rights
Agreement, the Escrow Agreement, the Certificate of Designations or the Warrants
will (i) result in the creation or imposition by the Company of any liens,
charges, claims or other encumbrances upon the Common Stock, the Exchangeable
Preferred Stock, the Exchange Shares, the Warrants or the Warrant Shares or,
except as contemplated herein, any of the assets of the Company, or (ii) entitle
the holders of Outstanding Capital Shares to preemptive or other rights to
subscribe for or acquire the Capital Shares or other securities of the Company.
The Common Stock, the Exchangeable Preferred Stock, the Exchange Shares, the
Warrants and the Warrant Shares shall not subject the Investors to personal
liability to the Company or its creditors by reason of the possession thereof.

Section 4.7. NO GENERAL SOLICITATION OR ADVERTISING IN REGARD TO THIS
TRANSACTION. Neither the Company nor any of its affiliates nor, to the knowledge
of the Company, any person acting on its or their behalf (i) has conducted or
will conduct any general solicitation (as that term is used in Rule 502(c) of
Regulation D) or general advertising with respect to the sale of the Common
Stock, the Exchangeable Preferred Stock or the Warrants, or (ii) made any offers
or sales of any security or solicited any offers to buy any security under any
circumstances that would require registration of the Common Stock, the
Exchangeable Preferred Stock, the Exchange Shares, the Warrants or the Warrant
Shares under the Securities Act.

Section 4.8. NO CONFLICTS. The execution, delivery and performance of this
Agreement by the Company and the consummation by the Company of the transactions
contemplated hereby, including without limitation the issuance of and payment of
dividends upon the Exchangeable Preferred Stock, the Exchange Shares, the
Warrants and the Warrant Shares and the Common Stock, do not and will not (i)
result in a violation of the Company's Certificate of Incorporation or By-Laws
or (ii) conflict with, or constitute a material default (or an event that with
notice or lapse of time or both would become a default) under, or give to others
any rights of termination, amendment, acceleration or cancellation of, any
material agreement,


                                   EX 10.1 - 9
<PAGE>


indenture or instrument, or any "lock-up" or similar provision of any
underwriting or similar agreement to which the Company is a party, or (iii)
result in a violation of any federal, state or local law, rule, regulation,
order, judgment or decree (including federal and state securities laws and
regulations) applicable to the Company or by which any material property or
asset of the Company is bound or affected, nor is the Company otherwise in
violation of, conflict with or default under any of the foregoing (except in
each case for such conflicts, defaults, terminations, amendments, accelerations,
cancellations and violations as would not have, individually or in the
aggregate, a Material Adverse Effect). The business of the Company is not being
conducted in violation of any law, ordinance or regulation of any governmental
entity, except for possible violations that either singly or in the aggregate
would not have a Material Adverse Effect. The Company is not required under any
Federal, state or local law, rule or regulation to obtain any consent,
authorization or order of, or make any filing or registration with, any court or
governmental agency in order for it to execute, deliver or perform any of its
obligations under this Agreement or issue and sell the Common Stock, the
Exchangeable Preferred Stock or the Warrants in accordance with the terms hereof
(other than any SEC, Principal Market or state securities filings that may be
required to be made by the Company subsequent to Closing, any registration
statement that may be filed pursuant hereto, and any shareholder approval
required by the rules applicable to companies whose common stock trades on the
Principal Market); provided that, for purposes of the representation made in
this sentence, the Company is assuming and relying upon the accuracy of the
relevant representations and agreements of the Investors herein.

Section 4.9. NO MATERIAL ADVERSE CHANGE. Since June 30, 1999, no Material
Adverse Effect has occurred or exists with respect to the Company, except as
disclosed in the SEC Documents.

Section 4.10. NO UNDISCLOSED EVENTS OR CIRCUMSTANCES. Since June 30, 1999, no
material event or circumstance has occurred or exists with respect to the
Company or its businesses, properties, prospects, operations or financial
condition, which has not been publicly announced or disclosed in the SEC
Documents.

Section 4.11. NO INTEGRATED OFFERING. Other than pursuant to an effective
registration statement under the Securities Act, or pursuant to the issuance or
exercise of employee stock options, or pursuant to its discussion with the
Investors in connection with the transactions contemplated hereby, the Company
has not issued, offered or sold the Common Stock, the Exchangeable Preferred
Stock, the Warrants or any shares of Common Stock (including for this purpose
any securities of the same or a similar class as the Exchangeable Preferred
Stock, the Warrants or Common Stock, or any securities exchangeable into or
exercisable for the Exchangeable Preferred Stock or Common Stock or any such
other securities) within the six-month period next preceding the date hereof,
and the Company shall not permit any of its directors, officers or affiliates
directly or indirectly to take, any action (including, without limitation, any
offering or sale to any Person of the Exchangeable Preferred Stock, Warrants or
shares of Common Stock), so as to make unavailable the exemption from Securities
Act registration being relied upon by the Company for the offer and sale to
Investors of the Exchangeable Preferred Stock (and the Exchange Shares) or the
Warrants (and the Warrant Shares) as contemplated by this Agreement.

Section 4.12. LITIGATION AND OTHER PROCEEDINGS. Except as disclosed in the SEC
Documents, there are no lawsuits or proceedings pending or, to the knowledge of
the Company, threatened, against the Company or any subsidiary, nor has the
Company received any written or oral notice of any such action, suit, proceeding
or investigation, which could reasonably be expected to have a Material Adverse
Effect. Except as set forth in the SEC Documents, no judgment, order, writ,
injunction or decree or award has been issued by or, to the knowledge of the
Company, requested of any court, arbitrator or governmental agency which could
result in a Material Adverse Effect.

Section 4.13. NO MISLEADING OR UNTRUE COMMUNICATION. The Company and, to the
knowledge of the Company, any person representing the Company, or any other
person selling or offering to sell the Common


                                  EX 10.1 - 10
<PAGE>


Stock, the Exchangeable Preferred Stock or the Warrants in connection with the
transaction contemplated by this Agreement, have not made, at any time, any oral
communication in connection with the offer or sale of the same which contained
any untrue statement of a material fact or omitted to state any material fact
necessary in order to make the statements, in the light of the circumstances
under which they were made, not misleading.

Section 4.14. MATERIAL NON-PUBLIC INFORMATION. The Company has not disclosed to
the Investors any non-public information it believes to be material that (i) if
disclosed, would reasonably be expected to have a material effect on the trading
price of the Common Stock and (ii) according to applicable law, rule or
regulation, should have been disclosed publicly by the Company prior to the date
hereof but which has not been so disclosed.

Section 4.15. INSURANCE. The Company and each subsidiary maintains property and
casualty, general liability, workers' compensation, environmental hazard,
personal injury and other similar types of insurance with financially sound and
reputable insurers that is adequate, consistent with industry standards and the
Company's historical claims experience. The Company has not received notice
from, and has no knowledge of any threat by, any insurer (that has issued any
insurance policy to the Company) that such insurer intends to deny coverage
under or cancel, discontinue or not renew any insurance policy presently in
force.

Section 4.16. TAX MATTERS.

       (a) The Company and each subsidiary has filed all Tax Returns which it is
required to file under applicable laws; all such Tax Returns are true and
accurate and has been prepared in compliance with all applicable laws; the
Company has paid all Taxes due and owing by it or any subsidiary (whether or not
such Taxes are required to be shown on a Tax Return) and have withheld and paid
over to the appropriate taxing authorities all Taxes which it is required to
withhold from amounts paid or owing to any employee, stockholder, creditor or
other third parties; and since December 31, 1998, the charges, accruals and
reserves for Taxes with respect to the Company (including any provisions for
deferred income taxes) reflected on the books of the Company are adequate to
cover any Tax liabilities of the Company if its current tax year were treated as
ending on the date hereof.

       (b) No claim has been made by a taxing authority in a jurisdiction where
the Company does not file tax returns that the Company or any subsidiary is or
may be subject to taxation by that jurisdiction. There are no foreign, federal,
state or local tax audits or administrative or judicial proceedings pending or
being conducted with respect to the Company or any subsidiary; no information
related to Tax matters has been requested by any foreign, federal, state or
local taxing authority; and, except as disclosed above, no written notice
indicating an intent to open an audit or other review has been received by the
Company or any subsidiary from any foreign, federal, state or local taxing
authority. There are no material unresolved questions or claims concerning the
Company's Tax liability. The Company (A) has not executed or entered into a
closing agreement pursuant to ss. 7121 of the Internal Revenue Code or any
predecessor provision thereof or any similar provision of state, local or
foreign law; or (B) has not agreed to or is required to make any adjustments
pursuant to ss. 481 (a) of the Internal Revenue Code or any similar provision of
state, local or foreign law by reason of a change in accounting method initiated
by the Company or any of its subsidiaries or has any knowledge that the IRS has
proposed any such adjustment or change in accounting method, or has any
application pending with any taxing authority requesting permission for any
changes in accounting methods that relate to the business or operations of the
Company. The Company has not been a United States real property holding
corporation within the meaning of ss. 897(c)(2) of the Internal Revenue Code
during the applicable period specified in ss. 897(c)(1)(A)(ii) of the Internal
Revenue Code.

       (c) The Company has not made an election under ss. 341(f) of the Internal
Revenue Code. The Company is not liable for the Taxes of another person that is
not a subsidiary of the Company under (A) Treas. Reg. ss. 1.1502-6 (or
comparable provisions of state, local or foreign law), (B) as a transferee or


                                  EX 10.1 - 11
<PAGE>


successor, (C) by contract or indemnity or (D) otherwise. The Company is not a
party to any tax sharing agreement. The Company has not made any payments, is
obligated to make payments or is a party to an agreement that could obligate it
to make any payments that would not be deductible under ss. 280G of the Internal
Revenue Code.

       (d) For purposes of this Section 4.16:

              "IRS" means the United States Internal Revenue Service.

              "TAX" or "TAXES" means federal, state, county, local, foreign, or
              other income, gross receipts, ad valorem, franchise, profits,
              sales or use, transfer, registration, excise, utility,
              environmental, communications, real or personal property, capital
              stock, license, payroll, wage or other withholding, employment,
              social security, severance, stamp, occupation, alternative or
              add-on minimum, estimated and other taxes of any kind whatsoever
              (including, without limitation, deficiencies, penalties, additions
              to tax, and interest attributable thereto) whether disputed or
              not.

              "TAX RETURN" means any return, information report or filing with
              respect to Taxes, including any schedules attached thereto and
              including any amendment thereof.

Section 4.17. PROPERTY. Neither the Company nor any of its subsidiaries owns any
real property. Each of the Company and its subsidiaries has good and marketable
title to all personal property owned by it, free and clear of all liens,
encumbrances and defects except such as do not materially affect the value of
such property and do not materially interfere with the use made and proposed to
be made of such property by the Company; and to the Company's knowledge any real
property and buildings held under lease by the Company as tenant are held by it
under valid, subsisting and enforceable leases with such exceptions as are not
material and do not interfere with the use made and intended to be made of such
property and buildings by the Company.

Section 4.18. INTELLECTUAL PROPERTY. Each of the Company and its subsidiaries
owns or possesses adequate and enforceable rights to use all patents, patent
applications, trademarks, trademark applications, trade names, service marks,
copyrights, copyright applications, licenses, know-how (including trade secrets
and other unpatented and/or unpatentable proprietary or confidential
information, systems or procedures) and other similar rights and proprietary
knowledge (collectively, "Intangibles") necessary for the conduct of its
business as now being conducted. To the Company's knowledge, except as disclosed
in the SEC Documents neither the Company nor any of its subsidiaries is
infringing upon or in conflict with any right of any other person with respect
to any Intangibles. Except as disclosed in the SEC Documents, no adverse claims
have been asserted by any person to the ownership or use of any Intangibles and
the Company has no knowledge of any basis for such claim.

Section 4.19. INTERNAL CONTROLS AND PROCEDURES. The Company maintains books and
records and internal accounting controls which provide reasonable assurance that
(i) all transactions to which the Company or any subsidiary is a party or by
which its properties are bound are executed with management's authorization;
(ii) the recorded accounting of the Company's consolidated assets is compared
with existing assets at regular intervals; (iii) access to the Company's
consolidated assets is permitted only in accordance with management's
authorization; and (iv) all transactions to which the Company or any subsidiary
is a party or by which its properties are bound are recorded as necessary to
permit preparation of the financial statements of the Company in accordance with
U.S. generally accepted accounting principles.

Section 4.20. PAYMENTS AND CONTRIBUTIONS. Neither the Company, any subsidiary,
nor any of its directors, officers or, to its knowledge, other employees has (i)
used any Company funds for any unlawful contribution, endorsement, gift,
entertainment or other unlawful expense relating to political activity; (ii)
made any direct


                                  EX 10.1 - 12
<PAGE>


or indirect unlawful payment of Company funds to any foreign or domestic
government official or employee; (iii) violated or is in violation of any
provision of the Foreign Corrupt Practices Act of 1977, as amended; or (iv) made
any bribe, rebate, payoff, influence payment, kickback or other similar payment
to any person with respect to Company matters.

Section 4.21. NO MISREPRESENTATION. The representations and warranties of the
Company (when read in conjunction with the Disclosure Letter) contained in this
Agreement, any schedule, annex or exhibit hereto, do not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading.

                                   ARTICLE V

                           COVENANTS OF THE INVESTORS

       Each Investor, severally and not jointly, covenants with the Company
that:

Section 5.1. COMPLIANCE WITH LAW. The Investor's trading activities with respect
to shares of the Company's Common Stock will be in compliance with all
applicable state and federal securities laws, rules and regulations and rules
and regulations of the Principal Market on which the Company's Common Stock is
listed.

Section 5.2. NO SHORT SALES. The Investor and its affiliates shall not engage in
short sales of the Company's Common Stock (as defined in applicable SEC and NASD
rules) so long as the Investor holds any unconverted shares of Exchangeable
Preferred Stock.

                                   ARTICLE VI

                            COVENANTS OF THE COMPANY

Section 6.1. REGISTRATION RIGHTS. The Company shall cause the Registration
Rights Agreement to remain in full force and effect and the Company shall comply
in all material respects with the terms thereof.

Section 6.2. RESERVATION OF COMMON STOCK. As of the date hereof, the Company has
reserved and the Company shall continue to reserve and keep available at all
times, free of preemptive rights, shares of Common Stock for the purpose of
enabling the Company to issue the Exchange Shares and the Warrant Shares
pursuant to any exchange of the Exchangeable Preferred Stock or exercise of the
Warrants. The number of shares so reserved from time to time, as theretofore
increased or reduced as hereinafter provided, may be reduced by the number of
shares actually delivered pursuant to any exchange of the Exchangeable Preferred
Stock or exercise of the Warrants and the number of shares so reserved shall be
increased or decreased to reflect potential increases or decreases in the Common
Stock that the Company may thereafter be obligated to issue by reason of
adjustments to the Warrants.

Section 6.3. LISTING OF COMMON STOCK. The Company hereby agrees to maintain the
listing of the Common Stock on a Principal Market, and as soon as reasonably
practicable following the Closing to list the Exchange Shares and the Warrant
Shares on the Principal Market. The Company further agrees, if the Company
applies to have the Common Stock traded on any other Principal Market, it will
include in such application the Common Stock, the Exchange Shares and the
Warrant Shares, and will take such other action as is necessary or desirable in
the opinion of the Investors to cause the Common Stock, the Exchange Shares and
Warrant Shares to be listed on such other Principal Market as promptly as
possible. The Company will


                                  EX 10.1 - 13
<PAGE>


take all action to continue the listing and trading of its Common Stock on a
Principal Market (including, without limitation, maintaining sufficient net
tangible assets) and will comply in all respects with the Company's reporting,
filing and other obligations under the bylaws or rules of the Principal Market
and shall provide Investors with copies of any correspondence to or from such
Principal Market which questions or threatens delisting of the Common Stock,
within three (3) Trading Days of the Company's receipt thereof, until the
Investors have disposed of all of their Registrable Securities. The Company
agrees to present a proposal for stockholder approval at the next annual meeting
of stockholders to permit the Company to issue a number of Exchange Shares and
Warrant Shares which is in excess of 19.9% of the number of the Company's issued
and outstanding shares of Common Stock on the Closing Date, with the
recommendation of the Board of Directors that such proposal be approved, unless
at the date of such meeting, less than two percent (2%) of the Exchangeable
Preferred Stock remains issued and outstanding. If such proposal is not
approved, the Company shall either (i) voluntarily de-list its Common Stock from
any Principal Market which requires such approval or (ii) redeem any
un-exchanged Exchangeable Preferred Stock pursuant to Section 7 of the
Certificate of Designations, within five (5) Trading Days of such vote.

Section 6.4. EXCHANGE ACT REGISTRATION. The Company will cause its Common Stock
to continue to be registered under Section 12(b) or (g) of the Exchange Act,
will use its best efforts to comply in all respects with its reporting and
filing obligations under the Exchange Act, and will not take any action or file
any document (whether or not permitted by the Exchange Act or the rules
thereunder) to terminate or suspend such registration or to terminate or suspend
its reporting and filing obligations under said Act until the Investors have
disposed of all of their Registrable Securities.

Section 6.5. LEGENDS. The certificates evidencing the Registrable Securities
shall be free of legends, except as set forth in Article IX.

Section 6.6. CORPORATE EXISTENCE; CONFLICTING AGREEMENTS. The Company will take
all steps necessary to preserve and continue the corporate existence of the
Company. The Company shall not enter into any agreement, the terms of which
agreement would restrict or impair the right or ability of the Company to
perform any of its obligations under this Agreement or any of the other
agreements attached as exhibits hereto or under the Certificate of Designations.

Section 6.7. CONSOLIDATION; MERGER. The Company shall not, at any time after the
date hereof, effect any merger or consolidation of the Company with or into, or
a transfer of all or substantially all of the assets of the Company to, another
entity (a "Consolidation Event") unless the resulting successor or acquiring
entity (if not the Company) assumes by written instrument or by operation of law
the obligation to deliver to the Investors such shares of stock and/or
securities as the Investors are entitled to receive pursuant to this Agreement
and the Certificate of Designations.

Section 6.8. ISSUANCE OF COMMON STOCK, EXCHANGEABLE PREFERRED STOCK AND WARRANT
SHARES. The sale of the Common Stock, the Exchangeable Preferred Stock and the
Warrants and the issuance of the Warrant Shares pursuant to exercise of the
Warrants and the Exchange Shares upon exchange of the Exchangeable Preferred
Stock shall be made in accordance with the provisions and requirements of
Section 4(2), 4(6) or Regulation D and any applicable state securities law. The
Company shall make any necessary SEC and "blue sky" filings required to be made
by the Company in connection with the sale of the Securities to the Investors as
required by all applicable laws, and shall provide a copy thereof to the
Investors promptly after such filing.

Section 6.9. LIMITATION ON FUTURE FINANCING. The Company agrees that it will not
enter into any sale of its securities for cash at a discount to the then-current
bid price of its Common Stock until 180 days after the effective date of the
Registration Statement except for any sales (i) of Common Stock for gross
proceeds of up to $4,000,000 at a discount of up to 10%, (ii) pursuant to any
underwritten public offering of Common Stock and/or warrants to purchase Common
Stock, (iii) pursuant to any presently existing employee benefit


                                  EX 10.1 - 14
<PAGE>


plan which plan has been approved by the Company's stockholders, (iv) pursuant
to any compensatory plan for a full-time employee or key consultant, (v)
pursuant to a private placement in which the purchasers are not given any
registration rights or (vi) with the prior approval of a majority in interest of
the Investors, which will not be unreasonably withheld, in connection with a
strategic partnership or other business transaction, the principal purpose of
which is not simply to raise money. Further, the Investors shall have a right of
first offer, exercisable within five (5) Trading Days of notice from the Company
setting forth the principal terms of any such transaction, to elect to
participate, pro-rata, in such subsequent transaction in the case of (i) and (v)
above.

Section 6.10. PRO-RATA REDEMPTION. The Company agrees that if it shall redeem
any of the Exchangeable Preferred Stock, that it shall make such redemption
pro-rata among all Investors in proportion their respective initial purchases of
such securities pursuant to this Agreement.

                                   ARTICLE VII

                            SURVIVAL; INDEMNIFICATION

Section 7.1. SURVIVAL. The representations and warranties (when read in
conjunction with the Disclosure Letter) and covenants made by each of the
Company and each Investor in this Agreement, the annexes, schedules and exhibits
hereto and in each instrument, agreement and certificate entered into and
delivered by them pursuant to this Agreement, shall survive the Closing and the
consummation of the transactions contemplated hereby. In the event of a breach
or violation of any of such representations, warranties or covenants, the party
to whom such representations, warranties or covenants have been made shall have
all rights and remedies for such breach or violation available to it under the
provisions of this Agreement, irrespective of any investigation made by or on
behalf of such party on or prior to the Closing Date.

Section 7.2. INDEMNITY. (a) The Company hereby agrees to indemnify and hold
harmless the Investors, their respective Affiliates and their respective
officers, directors, partners and members (collectively, the "Investor
Indemnitees"), from and against any and all Damages, and agrees to reimburse the
Investor Indemnitees for all reasonable out-of-pocket expenses (including the
reasonable fees and expenses of legal counsel), in each case promptly as
incurred by the Investor Indemnitees and to the extent arising out of or in
connection with:

              (i) any misrepresentation, omission of fact or breach of any of
       the Company's representations or warranties (when read in conjunction
       with the Disclosure Letter) contained in this Agreement, the annexes,
       schedules or exhibits hereto or any instrument, agreement or certificate
       entered into or delivered by the Company pursuant to this Agreement; or

              (ii) any failure by the Company to perform in any material respect
       any of its covenants, agreements, undertakings or obligations set forth
       in this Agreement, the annexes, schedules or exhibits hereto or any
       instrument, agreement or certificate entered into or delivered by the
       Company pursuant to this Agreement; or

              (iii) any action instituted against the Investors, or any of them,
       by any stockholder of the Company who is not an Affiliate of an Investor,
       with respect to any of the transactions contemplated by this Agreement.

       (b) Each Investor, severally and not jointly, hereby agrees to indemnify
and hold harmless the Company, its Affiliates and their respective officers,
directors, partners and members (collectively, the "Company Indemnitees"), from
and against any and all Damages, and agrees to reimburse the Company


                                  EX 10.1 - 15
<PAGE>


Indemnitees for reasonable all out-of-pocket expenses (including the reasonable
fees and expenses of legal counsel), in each case promptly as incurred by the
Company Indemnitees and to the extent arising out of or in connection with any
misrepresentation, omission of fact, or breach of any of the Investor's
representations or warranties contained in this Agreement, the annexes,
schedules or exhibits hereto or any instrument, agreement or certificate entered
into or delivered by the Investor pursuant to this Agreement.

Section 7.3. NOTICE. Promptly after receipt by either party hereto seeking
indemnification pursuant to Section 7.2 (an "Indemnified Party") of written
notice of any investigation, claim, proceeding or other action in respect of
which indemnification is being sought (each, a "Claim"), the Indemnified Party
promptly shall notify the party from whom indemnification pursuant to Section
7.2 is being sought (the "Indemnifying Party") of the commencement thereof; but
the omission to so notify the Indemnifying Party shall not relieve it from any
liability that it otherwise may have to the Indemnified Party, except to the
extent that the Indemnifying Party is actually prejudiced by such omission or
delay. In connection with any Claim as to which both the Indemnifying Party and
the Indemnified Party are parties, the Indemnifying Party shall be entitled to
assume the defense thereof. Notwithstanding the assumption of the defense of any
Claim by the Indemnifying Party, the Indemnified Party shall have the right to
employ separate legal counsel and to participate in the defense of such Claim,
and the Indemnifying Party shall bear the reasonable fees, out-of-pocket costs
and expenses of such separate legal counsel to the Indemnified Party if (and
only if): (x) the Indemnifying Party shall have agreed to pay such fees,
out-of-pocket costs and expenses, (y) the Indemnified Party reasonably shall
have concluded that representation of the Indemnified Party and the Indemnifying
Party by the same legal counsel would not be appropriate due to actual or, as
reasonably determined by legal counsel to the Indemnified Party, potentially
differing interests between such parties in the conduct of the defense of such
Claim, or if there may be legal defenses available to the Indemnified Party that
are in addition to or disparate from those available to the Indemnifying Party,
or (z) the Indemnifying Party shall have failed to employ legal counsel
reasonably satisfactory to the Indemnified Party within a reasonable period of
time after notice of the commencement of such Claim. If the Indemnified Party
employs separate legal counsel in circumstances other than as described in
clauses (x), (y) or (z) above, the fees, costs and expenses of such legal
counsel shall be borne exclusively by the Indemnified Party. Except as provided
above, the Indemnifying Party shall not, in connection with any Claim in the
same jurisdiction, be liable for the fees and expenses of more than one firm of
legal counsel for the Indemnified Party (together with appropriate local
counsel). The Indemnifying Party shall not, without the prior written consent of
the Indemnified Party (which consent shall not unreasonably be withheld), settle
or compromise any Claim or consent to the entry of any judgment that does not
include an unconditional release of the Indemnified Party from all liabilities
with respect to such Claim or judgment.

Section 7.4. DIRECT CLAIMS. In the event one party hereunder should have a claim
for indemnification that does not involve a claim or demand being asserted by a
third party, the Indemnified Party promptly shall deliver notice of such claim
to the Indemnifying Party. If the Indemnified Party disputes the claim, such
dispute shall be resolved by mutual agreement of the Indemnified Party and the
Indemnifying Party or by binding arbitration conducted in accordance with the
procedures and rules of the American Arbitration Association as set forth in
Article X. Judgment upon any award rendered by any arbitrators may be entered in
any court having competent jurisdiction thereof.

                                  ARTICLE VIII

         DUE DILIGENCE REVIEW; NON-DISCLOSURE OF NON-PUBLIC INFORMATION.

Section 8.1. DUE DILIGENCE REVIEW. Subject to Section 8.2, the Company shall
make available for inspection and review by the Investors, advisors to and
representatives of the Investors (who may or may not be affiliated with the
Investors and who are reasonably acceptable to the Company), any underwriter


                                  EX 10.1 - 16
<PAGE>


participating in any disposition of the Registrable Securities on behalf of the
Investors pursuant to the Registration Statement, any such registration
statement or amendment or supplement thereto or any blue sky, Nasdaq or other
filing, all SEC Documents and other filings with the SEC, and all other publicly
available corporate documents and properties of the Company as may be reasonably
necessary for the purpose of such review, and cause the Company's officers,
directors and employees to supply all such publicly available information
reasonably requested by the Investors or any such representative, advisor or
underwriter in connection with such Registration Statement (including, without
limitation, in response to all questions and other inquiries reasonably made or
submitted by any of them), prior to and from time to time after the filing and
effectiveness of the Registration Statement for the sole purpose of enabling the
Investors and such representatives, advisors and underwriters and their
respective accountants and attorneys to conduct initial and ongoing due
diligence with respect to the Company and the accuracy of the Registration
Statement.

Section 8.2. NON-DISCLOSURE OF NON-PUBLIC INFORMATION.

       (a) The Company shall not disclose non-public information it believes to
be material to the Investors, advisors to or representatives of the Investors
unless prior to disclosure of such information the Company identifies such
information as being non-public information and provides the Investors, such
advisors and representatives with the opportunity to accept or refuse to accept
such non-public information for review. Other than disclosure of any comment
letters received from the SEC staff with respect to the Registration Statement,
the Company may, as a condition to disclosing any non-public information
hereunder, require the Investors' advisors and representatives to enter into a
confidentiality agreement in form and content reasonably satisfactory to the
Company and the Investors.

       (b) Nothing herein shall require the Company to disclose material
non-public information to the Investors or their advisors or representatives,
provided, however, that notwithstanding anything herein to the contrary, the
Company will, as hereinabove provided, promptly notify the advisors and
representatives of the Investors and, if any, underwriters, of any event or the
existence of any circumstance (without any obligation to disclose the specific
event or circumstance) of which it becomes aware, constituting material
non-public information (whether or not requested of the Company specifically or
generally during the course of due diligence by such persons or entities),
which, if not disclosed in the prospectus included in the Registration Statement
would cause such prospectus to include a material misstatement or to omit a
material fact required to be stated therein in order to make the statements,
therein in light of the circumstances in which they were made, not misleading.
Nothing contained in this Section 8.2 shall be construed to mean that such
persons or entities other than the Investors (without the written consent of the
Investors prior to disclosure of such information as set forth in Section
8.2(a)) may not obtain non-public information in the course of conducting due
diligence in accordance with the terms of this Agreement and nothing herein
shall prevent any such persons or entities from notifying the Company of their
opinion that based on such due diligence by such persons or entities, that the
Registration Statement contains an untrue statement of a material fact or omits
a material fact required to be stated in the Registration Statement or necessary
to make the statements contained therein, in light of the circumstances in which
they were made, not misleading.

                                   ARTICLE IX

                      LEGENDS; TRANSFER AGENT INSTRUCTIONS

Section 9.1. LEGENDS. Unless otherwise provided below, each certificate
representing Registrable Securities will bear the following legend or equivalent
(the "Legend"):

THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY OTHER


                                  EX 10.1 - 17
<PAGE>


APPLICABLE SECURITIES LAWS AND HAVE BEEN ISSUED IN RELIANCE UPON AN EXEMPTION
FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND SUCH OTHER
SECURITIES LAWS. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN
MAY BE SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED, OR OTHERWISE DISPOSED
OF, EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES
ACT OR PURSUANT TO A TRANSACTION THAT IS EXEMPT FROM SUCH REGISTRATION.

Section 9.2. TRANSFER AGENT INSTRUCTIONS. Upon the execution and delivery
hereof, the Company is issuing to the transfer agent for its Common Stock (and
to any substitute or replacement transfer agent for its Common Stock upon the
Company's appointment of any such substitute or replacement transfer agent)
instructions substantially in the form of Exhibit F hereto. Such instructions
shall be irrevocable by the Company from and after the date hereof or from and
after the issuance thereof to any such substitute or replacement transfer agent,
as the case may be.

Section 9.3. NO OTHER LEGEND OR STOCK TRANSFER RESTRICTIONS. No legend other
than the one specified in Section 9.1 has been or shall be placed on the share
certificates representing the Registrable Securities and no instructions or
"stop transfer orders," "stock transfer restrictions," or other restrictions
have been or shall be given to the Company's transfer agent with respect thereto
other than as expressly set forth in this Article IX. Section 9.4. INVESTORS'
COMPLIANCE. Notwithstanding anything contained in this Agreement to the
contrary, each Investor shall comply with all applicable federal and state
securities laws upon resale of the Common Stock.

                                   ARTICLE X

                           CHOICE OF LAW; ARBITRATION

Section 10.1. GOVERNING LAW/ARBITRATION. This Agreement shall be governed by and
construed in accordance with the laws of the State of New York applicable to
contracts made in New York by persons domiciled in New York City and without
regard to its principles of conflicts of laws. Any dispute under this Agreement
shall be submitted to arbitration under the American Arbitration Association
(the "AAA") in New York City, New York, and shall be finally and conclusively
determined by the decision of a board of arbitration consisting of three (3)
members (hereinafter referred to as the "Board of Arbitration") selected
according to the rules governing the AAA. The Board of Arbitration shall meet on
consecutive business days in New York City, New York, and shall reach and render
a decision in writing (concurred in by a majority of the members of the Board of
Arbitration) with respect to the amount, if any, which the losing party is
required to pay to the other party in respect of a claim filed. In connection
with rendering its decisions, the Board of Arbitration shall adopt and follow
the laws of the State of New York unless the matter at issue is the corporation
law of the company's state of incorporation, in which event the corporation law
of such jurisdiction shall govern such issue. To the extent practical, decisions
of the Board of Arbitration shall be rendered no more than thirty (30) calendar
days following commencement of proceedings with respect thereto. The Board of
Arbitration shall cause its written decision to be delivered to all parties
involved in the dispute. Any decision made by the Board of Arbitration (either
prior to or after the expiration of such thirty (30) calendar day period) shall
be final, binding and conclusive on the parties to the dispute, and entitled to
be enforced to the fullest extent permitted by law and entered in any court of
competent jurisdiction. The Board of Arbitration shall be authorized and is
hereby directed to enter a default judgment against any party failing to
participate in any proceeding hereunder within the time periods set forth in the
AAA rules. The non-prevailing party to any arbitration (as determined by the


                                  EX 10.1 - 18
<PAGE>


Board of Arbitration) shall pay the expenses of the prevailing party, including
reasonable attorney's fees, in connection with such arbitration. Any party shall
be entitled to obtain injunctive relief from a court in any case where such
relief is available. The non-prevailing party to any injunctive proceeding (as
determined by the court) shall pay the expenses of the prevailing party,
including reasonable attorney's fees, in connection with such injunctive
proceeding.

                                   ARTICLE XI

                                   ASSIGNMENT

Section 11.1. ASSIGNMENT. Neither this Agreement nor any rights of the Investors
or the Company hereunder may be assigned by either party to any other person.
Notwithstanding the foregoing, (a) the provisions of this Agreement shall inure
to the benefit of, and be enforceable by, any permitted transferee of any of the
Exchangeable Preferred Stock or Warrants purchased or acquired by any Investor
hereunder with respect to the Exchangeable Preferred Stock or Warrants held by
such person, and (b) upon the prior written consent of the Company, which
consent shall not unreasonably be withheld or delayed, each Investor's interest
in this Agreement may be assigned at any time, in whole or in part, to any other
person or entity (including any Affiliate of the Investor) who agrees to make
the representations and warranties contained in Article III and who agrees to be
bound by the terms of this Agreement.

                                  ARTICLE XII

                                     NOTICES

Section 12.1. NOTICES. All notices, demands, requests, consents, approvals, and
other communications required or permitted hereunder shall be in writing and,
unless otherwise specified herein, shall be (i) hand delivered, (ii) deposited
in the mail, registered or certified, return receipt requested, postage prepaid,
(iii) delivered by reputable air courier service with charges prepaid, or (iv)
transmitted by facsimile, addressed as set forth below or to such other address
as such party shall have specified most recently by written notice. Any notice
or other communication required or permitted to be given hereunder shall be
deemed effective (a) upon hand delivery or delivery by facsimile, with accurate
confirmation generated by the transmitting facsimile machine, at the address or
number designated below (if delivered on a business day during normal business
hours where such notice is to be received), or the first business day following
such delivery (if delivered other than on a business day during normal business
hours where such notice is to be received) or (b) on the first business day
following the date of sending by reputable courier service, fully prepaid,
addressed to such address, or (c) upon actual receipt of such mailing, if
mailed. The addresses for such communications shall be:


                                  EX 10.1 - 19
<PAGE>


If to the Company:                  Dental/Medical Diagnostic Systems, Inc.
                                    200 North Westlake Boulevard, Suite 202
                                    Westlake Village, CA 91362
                                    Attention: Robert H. Gurevitch, President
                                    Telephone: 805-381-2700
                                    Facsimile: 805-

with a copy to (shall not           Murray Markiles, Esq.
constitute notice):                 Troop Steuber Pasich Reddick & Tobey, LLP
                                    2029 Century Park East, 24th Floor
                                    Los Angeles, CA 90067
                                    Telephone: 310-728-3233
                                    Facsimile: 310-728-2233

if to the Investors:                As set forth on the signature pages hereto

with a copy to (shall               Joseph A. Smith, Esq.
not constitute notice):             Epstein Becker & Green, P.C.
                                    250 Park Avenue
                                    New York, New York
                                    Telephone: (212) 351-4500
                                    Facsimile: (212) 661-0989

Either party hereto may from time to time change its address or facsimile number
for notices under this Section 12.1 by giving written notice of such changed
address or facsimile number to the other party hereto as provided in this
Section 12.1.

                                  ARTICLE XIII

                                  MISCELLANEOUS

Section 13.1. COUNTERPARTS/ FACSIMILE/ AMENDMENTS. This Agreement may be
executed in multiple counterparts, each of which may be executed by less than
all of the parties and shall be deemed to be an original instrument which shall
be enforceable against the parties actually executing such counterparts and all
of which together shall constitute one and the same instrument. Except as
otherwise stated herein, in lieu of the original documents, a facsimile
transmission or copy of the original documents shall be as effective and
enforceable as the original. This Agreement may be amended only by a writing
executed by all parties.

Section 13.2. ENTIRE AGREEMENT. This Agreement, the agreements attached as
Exhibits hereto, which include, but are not limited to the Certificate of
Designations, the Warrants, the Escrow Agreement, and the Registration Rights
Agreement, set forth the entire agreement and understanding of the parties
relating to the subject matter hereof and supersedes all prior and
contemporaneous agreements, negotiations and understandings between the parties,
both oral and written relating to the subject matter hereof. The terms and
conditions of all Exhibits to this Agreement are incorporated herein by this
reference and shall constitute part of this Agreement as is fully set forth
herein.

Section 13.3. SEVERABILITY. In the event that any provision of this Agreement
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full


                                  EX 10.1 - 20
<PAGE>


force and effect without said provision; provided that such severability shall
be ineffective if it materially changes the economic benefit of this Agreement
to any party.

Section 13.4. HEADINGS. The headings used in this Agreement are used for
convenience only and are not to be considered in construing or interpreting this
Agreement.

Section 13.5. NUMBER AND GENDER. There may be one or more Investors parties to
this Agreement, which Investors may be natural persons or entities. All
references to plural Investors shall apply equally to a single Investor if there
is only one Investor, and all references to an Investor as "it" shall apply
equally to a natural person.

Section 13.6. REPORTING ENTITY FOR THE COMMON STOCK. The reporting entity relied
upon for the determination of the trading price or trading volume of the Common
Stock on any given Trading Day for the purposes of this Agreement shall be
Bloomberg, L.P. or any successor thereto. The written mutual consent of the
Investors and the Company shall be required to employ any other reporting
entity.

Section 13.7. REPLACEMENT OF CERTIFICATES. Upon (i) receipt of evidence
reasonably satisfactory to the Company of the loss, theft, destruction or
mutilation of a certificate representing the Exchangeable Preferred Stock or any
Exchange Shares or Warrants or any Warrant Shares and (ii) in the case of any
such loss, theft or destruction of such certificate, upon delivery of an
indemnity agreement or security reasonably satisfactory in form to the Company
(which shall not exceed that customarily charged by the Company's transfer
agent) or (iii) in the case of any such mutilation, on surrender and
cancellation of such certificate, the Company at its expense will execute and
deliver, in lieu thereof, a new certificate of like tenor.

Section 13.8. FEES AND EXPENSES. Each of the Company and the Investors agrees to
pay its own expenses incident to the performance of its obligations hereunder.


                                  EX 10.1 - 21
<PAGE>


Section 13.9. PUBLICITY. The Company agrees that it will not issue any press
release or other public announcement of the transactions contemplated by this
Agreement without the prior consent of the Investors, which shall not be
unreasonably withheld nor delayed by more than two (2) Trading Days from their
receipt of such proposed release. No release shall name the Investors without
their express consent.

       IN WITNESS WHEREOF, the parties hereto have caused this Purchase
Agreement to be executed by the undersigned, thereunto duly authorized, as of
the date first set forth above.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


                                        By:  /S/ ROBERT H. GUREVITCH
                                             -----------------------------------
                                             Robert H. Gurevitch, President &
                                             CEO

                            AMRO International, S.A.

 c/o Ultra Finanz AG
 Grossmuensterplatz 6
 Zurich, CH-8022 Switzerland
 Fax: 011-411-262-5515                  By:  /S/ H. U. BACHOFEN
 Amount subscribed for:                      -----------------------------------
 $800,000                                    H. U. Bachofen, Director


                        The Endeavour Capital Fund, S.A.

 c/o Endeavour Management, Inc.
 14/14 Divrei Chaim Street
 Jerusalem 94479 Israel                 By:  /S/ SHMULI MARGULIES
 Fax: 011-9722-582-4443                      -----------------------------------
 Amount subscribed for:                      Shmuli Margulies, Authorized
 $400,000                                    Signatory11


                          Esquire Trade & Finance Inc.

 P.O. Box 2154
 Baar, CH-6342 Switzerland              By:  /S/ ROLAND WINIGER
 Fax: 011-411-760-1031                       -----------------------------------
 Amount subscribed for:                      Roland Winiger, Authorized
 $400,000                                    Signatory


                           Austinvest Anstalt Balzers

 Landstrasse 938
 9494 Furstenturns
 Balzers, Liechtenstein                 By:  /S/ WALTER GRILL
 Fax: 011-                                   -----------------------------------
 Amount subscribed for:                      Dr. Walter Grill, Authorized
 $400,000                                    Signatory


                                  EX 10.1 - 22
<PAGE>


                     SCHEDULE I - COMMON STOCK CERTIFICATES


<TABLE>
<CAPTION>
<S>                                <C>
Austinvest Anstalt Balzers         1,250 shares

Esquire Trade & Finance Inc.       1,250 shares
</TABLE>


                                  EX 10.1 - 23
<PAGE>


                                                                       EXHIBIT A
                          CERTIFICATE OF DESIGNATIONS,

                            PREFERENCES AND RIGHTS OF

                    SERIES A EXCHANGEABLE PREFERRED STOCK OF

                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

                             PURSUANT TO SECTION 151

                     OF THE DELAWARE GENERAL CORPORATION LAW



       The undersigned, being the Chief Executive Officer and the Secretary of
Dental/Medical Diagnostic Systems, Inc., a corporation organized and existing
under and by virtue of the laws of the State of Delaware (hereinafter the
"Corporation"), DO HEREBY CERTIFY:

       FIRST: That pursuant to authority expressly granted and vested in the
Board of Directors of said Corporation by the provisions of the Corporation's
Certificate of Incorporation, said Board of Directors adopted the following
resolution on November 9, 1999 determining the designations, preferences and
rights of its Series A Exchangeable Preferred Stock:

       RESOLVED: That pursuant to the authority vested in the Board of Directors
of the Corporation by the Corporation's Certificate of Incorporation, as amended
and restated (the "Certificate of Incorporation"), a series of Preferred Stock
of the Corporation be, and it hereby is, created out of the authorized but
unissued shares of the capital stock of the Corporation, such series to be
designated Series A Exchangeable Preferred Stock (the "Series A Exchangeable
Preferred Stock"), to consist of 2,000 shares, par value $0.01 per share, of
which the preferences and relative and other rights, and the qualifications,
limitations or restrictions thereof, shall be as set forth in the Certificate of
Designations annexed hereto:

       1. NUMBER OF SHARES OF SERIES A EXCHANGEABLE PREFERRED STOCK. Of the
1,000,000 shares of authorized but unissued Preferred Stock, $0.01 par value
("Preferred Stock") of the Corporation, two thousand (2,000) shares shall be
designated and known as Series A Exchangeable Preferred Stock, par value $0.01
per share ("Series A Exchangeable Preferred Stock").

       2. VOTING.

              (a) Unless required by law, no holder of any shares of Series A
       Exchangeable Preferred Stock shall be entitled to vote at any meeting of
       stockholders of the Corporation (or any written actions of stockholders
       in lieu of meetings) with respect to any matters presented to the
       stockholders of the Corporation for their action or consideration.
       Notwithstanding the foregoing, the Corporation shall provide each holder
       of record of Series A Exchangeable Preferred Stock with


<PAGE>


timely notice of every meeting of stockholders of the Corporation and shall
provide each holder with copies of all proxy materials distributed in connection
therewith.

              (b) So long as shares of Series A Exchangeable Preferred Stock are
       outstanding, the Corporation shall not, without first obtaining the
       approval (by vote or written consent, as provided by the Delaware General
       Corporation Law) of the holders of at least 75% in interest of the then
       outstanding shares of Series A Exchangeable Preferred Stock sold to the
       original purchasers thereof pursuant to the Exchangeable Preferred Stock
       and Warrant Purchase Agreement referred to in Section 13 hereof:

                     (i) alter or change the rights, preferences or privileges
              of the Series A Exchangeable Preferred Stock;

                     (ii) create any new class or series of capital stock having
              a preference over the Series A Exchangeable Preferred Stock as to
              distribution of assets upon liquidation, dissolution or winding up
              of the Corporation ("Senior Securities") or alter or change the
              rights, preferences or privileges of any Senior Securities so as
              to affect adversely the Series A Exchangeable Preferred Stock;

                     (iii) increase the authorized number of shares of Series A
              Exchangeable Preferred Stock; or

                     (iv) do any act or thing not authorized or contemplated by
              this Certificate of Designations which would result in taxation of
              the holders of shares of the Series A Exchangeable Preferred Stock
              under Section 305 of the Internal Revenue Code of 1986, as amended
              (or any comparable provision of the Internal Revenue Code as
              hereafter from time to time amended).

       In the event such holders of at least 75% in interest of the then
outstanding shares of Series A Exchangeable Preferred Stock agree to allow the
Corporation to alter or change the rights, preferences or privileges of the
shares of Series A Exchangeable Preferred Stock, pursuant to subsection (b)
above, so as to affect the Series A Exchangeable Preferred Stock, then the
Corporation will deliver notice of such approved change to the holders of the
Series A Exchangeable Preferred Stock that did not agree to such alteration or
change (the "Dissenting Holders") and Dissenting Holders shall have the right,
but not the obligation, for a period of thirty (30) days to exchange any and all
shares of then held Series A Exchangeable Preferred Stock pursuant to the terms
of this Certificate of Designation as in effect prior to such alteration or
change.

       3. DIVIDENDS.

       The holders of shares of Series A Exchangeable Preferred Stock shall be
entitled to receive, before any cash dividend shall be declared and paid upon or
set aside for the Common Stock in any fiscal year of the Corporation, out of
funds legally available for that purpose, cumulative dividends payable in cash
or in registered shares of Common Stock (at the sole election of the
Corporation) in an amount per share of Series A Exchangeable Preferred Stock
outstanding for such fiscal year equal to $40.00. Such dividends shall accrue
daily and be payable quarterly on March 31, June 30, September 30 and December
31 of each year. In the event that the Corporation shall elect to


                                  EX 10.1A - 2
<PAGE>


pay any such dividend payment in the form of Common Stock, such Common Stock
shall be valued at the Market Price on the dividend payment date, as defined in
Section 5 below.

       4. LIQUIDATION. (a) If the Corporation shall commence a voluntary case
under the Federal bankruptcy laws or any other applicable Federal or State
bankruptcy, insolvency or similar law, or consent to the entry of an order for
relief in an involuntary case under any law or to the appointment of a receiver,
liquidator, assignee, custodian, trustee, sequestrator (or other similar
official) of the Corporation or of any substantial part of its property, or make
an assignment for the benefit of its creditors, or admit in writing its
inability to pay its debts generally as they become due, or if a decree or order
for relief in respect of the Corporation shall be entered by a court having
jurisdiction in the premises in an involuntary case under the Federal bankruptcy
laws or any other applicable Federal or State bankruptcy, insolvency or similar
law resulting in the appointment of a receiver, liquidator, assignee, custodian,
trustee, sequestrator (or other similar official) of the Corporation or of any
substantial part of its property, or ordering the winding up or liquidation of
its affairs, and any such decree or order shall be unstayed and in effect for a
period of ninety (90) consecutive days and, on account of any such event, the
Corporation shall liquidate, dissolve or wind up, or if the Corporation shall
otherwise liquidate, dissolve or wind up (each such event being considered a
"Liquidating Event"), no distribution shall be made to the holders of any shares
of capital stock of the Corporation other than Senior Securities upon
liquidation, dissolution or winding up unless prior thereto, the holders of
shares of Series A Exchangeable Preferred Stock shall have received the
Liquidation Preference (as defined in Section 4(c)) with respect to each share.
If upon the occurrence of a Liquidation Event, the assets and funds available
for distribution among the holders of the Series A Exchangeable Preferred Stock
and holders of securities ranking pari passu as to preference upon liquidation
with the Series A Exchangeable Preferred Stock shall be insufficient to permit
the payment to such holders of the preferential amounts payable thereon, then
the entire assets and funds of the Corporation legally available for
distribution to the Series A Exchangeable Preferred Stock and such pari passu
securities shall be distributed ratably among such shares in proportion to the
ratio that that Liquidation Preference payable on each such share bears to the
aggregate Liquidation Preference payable on all such shares.

              (b) At the option of each holder, the sale, conveyance of
       disposition of all or substantially all of the assets of the Corporation,
       the effectuation by the Corporation of a transaction or series or related
       transactions in which more than 50% of the voting power of the
       Corporation is disposed of, or the consolidation, merger or other
       business combination of the Corporation with or into any other person or
       persons when the Corporation is not the survivor shall be deemed to be a
       liquidation, dissolution or winding up of the Corporation pursuant to
       which the Corporation shall be required to distribute, upon consummation
       of and as a condition to such transaction an amount equal to the
       Liquidation Preference with respect to each outstanding share of Series A
       Exchangeable Preferred Stock held by such holder in accordance with and
       subject to the terms of this Section 4.

              (c) The Liquidation Preference shall be the Stated Value of $1,000
       per share of Series A Exchangeable Preferred Stock plus all accrued but
       unpaid dividends.

       5. OPTIONAL EXCHANGE. The holders of shares of Series A Exchangeable
Preferred Stock shall have the following exchange rights:


                                  EX 10.1A - 3
<PAGE>


              (a) RIGHT TO EXCHANGE; EXCHANGE PRICE. Subject to the terms,
       conditions, and restrictions of this Section 5, the holder of any shares
       of Series A Exchangeable Preferred Stock shall have the right to exchange
       each such share of Series A Exchangeable Preferred Stock (except that
       upon any liquidation of the Corporation, the right of exchange shall
       terminate at the close of business on the business day fixed for payment
       of the amount distributable on the Series A Exchangeable Preferred Stock)
       for an amount of shares of Common Stock equal to the Stated Value of such
       share or shares of Series A Exchangeable Preferred Stock divided by (i)
       during the one hundred twenty one (121) day period following the Original
       Issuance Date, Four Dollars ($4.00) (the "Set Price") and (ii) on and
       after the 122nd day after the Original Issuance Date, the lesser of the
       Set Price or the average of the closing bid prices as reported by
       Bloomberg L.P., on the principal market for the Corporation's Common
       Stock based on trading volume (the "Principal Market") during any three
       (3) trading days selected by the Holder out of the period of thirty (30)
       consecutive trading days ending with the last trading day prior to the
       date of exchange (the "Exchange Date") (the "Market Price"), to determine
       the exchange price (the "Exchange Price"). However, in no event shall the
       Exchange Price be greater than the Set Price (the "Maximum Exchange
       Price"). In addition, if the Exchange Price on any Exchange Date is less
       than $6.00 (adjusted for any splits, reverse splits or dividends in the
       form of shares of Common Stock after the Original Issuance Date), then
       the Corporation shall have the option, upon at least three (3) trading
       days' prior written notice to all holders of its intention to do so, to
       pay the holder in cash in an amount equal to (i) the average of the
       closing bid and asked prices on the Principal Market on the Exchange Date
       multiplied by (ii) the number of shares of Common Stock which would
       otherwise be issuable to the holder upon such exchange. If notice of the
       Corporation's election to pay the holder in cash is not received by the
       holder prior to three trading days before the receipt by the Corporation
       of an Exchange Notice, the Corporation shall issue to the holder shares
       of Common Stock unless otherwise agreed to by the holder. Unless the
       Corporation shall have obtained the approval of its voting stockholders
       to such issuance in accordance with the rules of the Principal Market,
       the Corporation shall not issue shares of Common Stock upon exchange of
       any shares of Series A Exchangeable Preferred Stock if such issuance of
       Common Stock, when added to the number of shares of Common Stock
       previously issued by the Corporation upon exchange of shares of the
       Series A Exchangeable Preferred Stock or upon exercise of the Warrants
       issued in connection with the issuance of the Series A Exchangeable
       Preferred Stock, would exceed 19.9% of the number of shares of the
       Corporation's Common Stock which were issued and outstanding on the
       Original Issuance Date; and, in such event, or if the Corporation does
       not have registered shares of Common Stock available with which to honor
       Exchanges, the Corporation shall honor such exchange request in cash in
       accordance with the previous sentence, irrespective of the Exchange
       Price, and the holder shall be a creditor of the Corporation in respect
       of such sum. The right to exchange shares of Series A Exchangeable
       Preferred Stock shall be pro-rated among the original purchasers of such
       shares or their respective subsequent transferees, if any, in order to
       comply with the aforesaid overall limitation. Any exchange which is paid
       in cash shall be paid within three (3) business days of the Exchange
       Date, or else the late delivery payments set forth in Section 5(d)(ii)
       hereof shall apply to such late payment, and, upon demand of the holder
       in such event of late delivery, the holder may require the Corporation to
       deliver the shares otherwise issuable upon such exchange.

              (b) EXCHANGE DATE. (i) The holder of any shares of Series A
       Exchangeable Preferred Stock may exchange such shares immediately after
       the date upon which such shares of


                                  EX 10.1A - 4
<PAGE>


       Series A Preferred Stock were originally issued (the "Original Issuance
       Date"); provided, that the Corporation shall have the right, on no more
       than three (3) occasions during the life the Series A Exchangeable
       Preferred Stock, by at least two (2) trading days' prior written notice
       to the holders, to refuse to honor any Exchange Notice delivered during
       any specified seven (7) calendar day period.

                     (ii) In no event shall a holder be permitted to exchange
              any shares of Series A Exchangeable Preferred Stock in excess of
              the number of such shares upon the exchange of which, (x) the
              number of shares of Common Stock owned by such holder (other than
              shares of Common Stock issuable upon exchange of shares of Series
              A Exchangeable Preferred Stock) plus (y) the number of shares of
              Common Stock issuable upon such exchange of such shares of Series
              A Exchangeable Preferred Stock, would be equal to or exceed 9.9%
              of the number of shares of Common Stock then issued and
              outstanding, including shares issuable upon exchange of the Series
              A Exchangeable Preferred Stock held by such holder after
              application of this Section 5(b)(ii). As used herein, beneficial
              ownership shall be determined in accordance with Section 13(d) of
              the Securities Exchange Act of 1934, as amended, and the rules and
              regulations thereunder. To the extent that the limitation
              contained in this Section 5(b)(ii) applies, the determination of
              whether shares of Series A Exchangeable Preferred Stock are
              exchangeable (in relation to other securities owned by holder) and
              of which shares of Series A Exchangeable Preferred Stock are
              exchangeable shall be in the sole discretion of such holder, and
              the submission of shares of Series A Exchangeable Preferred Stock
              for exchange shall be deemed to be such holder's determination of
              whether such shares of Series A Exchangeable Preferred Stock are
              exchangeable (in relation to other securities owned by such
              holder) and of which shares of Series A Exchangeable Preferred
              Stock are exchangeable, in each case subject to such aggregate
              percentage limitation, and the Corporation shall have no
              obligation to verify or confirm the accuracy of such
              determination, and shall have no liability to holder with respect
              thereto. Nothing contained herein shall be deemed to restrict the
              right of a holder to exchange such shares of Series A Exchangeable
              Preferred Stock at such time as such exchange will not violate the
              provisions of this paragraph. The provisions of this Section
              5(b)(ii) may be waived by a holder of Series A Exchangeable
              Preferred Stock as to itself (and solely as to itself) upon (A)
              not less than 75 days' prior notice to the Corporation, and the
              provisions of this Section 5(b)(ii) shall continue to apply until
              such 75th day (or such later date as may be specified in such
              notice of waiver) or (B) not less than three (3) days' prior
              notice to the Corporation if and only if the Corporation shall
              have breached or defaulted upon one or more of its obligations to
              the holder pursuant to this Certificate of Designation. No
              exchange in violation of this paragraph but otherwise in
              accordance with this Certificate of Designation shall affect the
              status of the Common Stock issued upon such exchange as validly
              issued, fully-paid and nonassessable.

              (c) NOTICE OF EXCHANGE. The right of exchange shall be exercised
       by the holder thereof by giving written notice (the "Exchange Notice") to
       the Corporation, by facsimile or by registered mail or overnight delivery
       service, with a copy by facsimile to the Corporation's then transfer
       agent for its Common Stock, as designated by the Corporation from time to
       time, that the holder elects to exchange a specified number of shares of
       Series A Exchangeable Preferred Stock representing a specified Stated
       Value thereof for Common Stock and, if such exchange will result in the
       exchange of all of such holder's shares of Series A Exchangeable
       Preferred Stock, by surrender of a certificate or certificates for the
       shares so to be Exchanged to the Corporation at its principal office (or
       such other office or agency of the Corporation as the Corporation may
       designate by notice in writing to the holders of the Series A
       Exchangeable Preferred Stock) at any time during its usual


                                  EX 10.1A - 5
<PAGE>


       business hours on the date set forth in the Exchange Notice, together
       with a statement of the name or names (with address) in which the
       certificate or certificates for shares of Common Stock shall be issued.
       The Exchange Notice shall include therein the Stated Value of shares of
       Series A Exchangeable Preferred Stock to be Exchanged, and a calculation,
       if applicable, (i) of the Market Price, (ii) the Exchange Price, and
       (iii) the number of shares of Common Stock to be issued in connection
       with such Exchange.

              (d) ISSUANCE OF CERTIFICATES; TIME EXCHANGE EFFECTED. (i)
       Promptly, but in no event more than three business days, after the
       receipt of the Exchange Notice referred to in Section 5(c) and surrender
       of the certificate or certificates for the share or shares of Series A
       Exchangeable Preferred Stock to be exchanged (if required), the
       Corporation shall issue and deliver, or cause to be issued and delivered,
       to the holder, registered in such name or names as such holder may
       direct, a certificate or certificates for the number of whole shares of
       Common Stock for which such shares of Series A Exchangeable Preferred
       Stock are exchanged. To the extent permitted by law, such exchange shall
       be deemed to have been effected on the date on which such Exchange Notice
       shall have been received by the Corporation and at the time specified
       stated in such Exchange Notice, which must be during the calendar day of
       such notice, and at such time the rights of the holder of such share or
       shares of Series A Exchangeable Preferred Stock shall cease, and the
       person or persons in whose name or names any certificate or certificates
       for shares of Common Stock shall be issuable upon such exchange shall be
       deemed to have become the holder or holders of record of the shares
       represented thereby. Issuance of shares of Common Stock issuable upon
       exchange which are requested to be registered in a name other than that
       of the registered holder shall be subject to compliance with all
       applicable federal and state securities laws. In the event that the
       Corporation elects to pay cash in lieu of issuing Common Stock in
       accordance with Section 5(a) hereof, such cash payment shall be made on
       or before the third business day after receipt of an Exchange Notice.

                     (ii) The Corporation cannot refuse to effect the exchange
              of the Series A Exchangeable Preferred Stock into Common Shares or
              otherwise dishonor or reject any Exchange Notice delivered in
              accordance with this Section 5 based upon any claim that a holder
              or any person associated or affiliate with such holder has been
              engaged in any violation of law or for any other reason, unless an
              injunction from a court or regulatory body, on notice, restraining
              or enjoining the exchange of all or some of such shares of Series
              A Exchangeable Preferred Stock shall have issued and the
              Corporation shall have posted a surety bond for the benefit of the
              holder or holder so affected in the amount of the difference
              between the Exchange Price and the closing ask price on the
              trading day preceding the date of the attempted exchange,
              multiplied by the number of shares of Common Stock which would
              have been issuable upon such exchange, which bond shall remain in
              effect until the completion of the arbitration or litigation of
              the dispute and the proceeds of which shall be payable to the
              affected holder or holders in the event its obtains a favorable
              judgment. If any third party who is not and has never been an
              Affiliate (as defined in Rule 405 under the Securities Act of
              1933, as amended) of the holder obtains a judgment or any
              injunctive relief from any court or public or governmental
              authority which denies, enjoins, limits, modifies, delays or
              disputes the right of the holder hereof to effect the exchange of
              the Series A Exchangeable Preferred Stock into Common Shares, then
              the holder shall also have the right, by written notice to the
              Corporation, to require the Corporation to promptly redeem the
              Series A Exchangeable Preferred Stock for cash at a redemption
              price equal to one hundred twenty five percent (125%) of the
              Stated Value thereof (the "Mandatory Purchase Amount"). Under any
              of the circumstances set forth above, the Corporation shall be


                                  EX 10.1A - 6
<PAGE>


              responsible for the payment of all costs and expenses of the
              holder, including reasonable legal fees and expenses, as and when
              incurred in disputing any such action or pursuing its rights
              hereunder (in addition to any other rights of the holder). In the
              absence of an injunction precluding the same, the Corporation
              shall issue shares upon a properly noticed exchange.

                     (iii) The holder shall be entitled to exercise its exchange
              privilege notwithstanding the commencement of any case under 11
              U.S.C. ss. 101 ET SEQ. (the "Bankruptcy Code"). In the event the
              Corporation is a debtor under the Bankruptcy Code, the Corporation
              hereby waives to the fullest extent permitted any rights to relief
              it may have under 11 U.S.C. ss. 362 in respect of the holder's
              exchange privilege. The Corporation hereby waives to the fullest
              extent permitted any rights to relief it may have under 11 U.S.C.
              ss. 362 in respect of the exchange of the Series A Exchangeable
              Preferred Stock. The Corporation agrees, without cost or expense
              to the holder, to take or consent to any and all action necessary
              to effectuate relief under 11 U.S.C. ss. 362.

              (e) FRACTIONAL SHARES. No fractional shares shall be issued upon
       exchange of Series A Exchangeable Preferred Stock for Common Stock. All
       fractional shares shall be payable in cash at the closing price per share
       on the business day prior to the day such payment is accrued. All
       exchanges pursuant to Section 5 or Section 6 hereof by any holder shall
       be aggregated so that in no event shall any single holder receive a cash
       payment in lieu of fractional shares pursuant to this subsection for a
       fraction greater than or equal to one (1).

              (f) REORGANIZATION OR RECLASSIFICATION. If any capital
       reorganization or reclassification of the capital stock of the
       Corporation shall be effected in such a way that holders of Common Stock
       shall be entitled to receive stock, securities or assets with respect to
       or in exchange for Common Stock, or, in the case of any consolidation,
       merger or mandatory share exchange of the Corporation into any other
       company, then, as a condition of such reorganization, reclassification or
       exchange, lawful and adequate provisions shall be made whereby each
       holder of a share or shares of Series A Exchangeable Preferred Stock
       shall thereupon have the right to receive, upon the basis and upon the
       terms and conditions specified herein and in lieu of the shares of Common
       Stock immediately theretofore receivable upon the exchange of such share
       or shares of Series A Exchangeable Preferred Stock, such shares of stock,
       securities or assets as may be issued or payable with respect to or in
       exchange for a number of outstanding shares of such Common Stock equal to
       the number of shares of such Common Stock immediately theretofore
       receivable upon such exchange had such reorganization, reclassification
       or exchange not taken place, and in any such case appropriate provisions
       shall be made with respect to the rights and interests of such holder to
       the end that the provisions hereof (including without limitation
       provisions for adjustments of the exchange rights) shall thereafter be
       applicable, as nearly as may be, in relation to any shares of stock,
       securities or assets thereafter deliverable upon the exercise of such
       exchange rights.

              (g) ADJUSTMENTS FOR SPLITS, COMBINATIONS, ETC. The Set Price and
       the number of shares of Common Stock into which the Series A Exchangeable
       Preferred Stock shall be Exchangeable shall be adjusted for stock splits,
       stock dividends, combinations or other similar events. No adjustment to
       the Exchange Price will be made for dividends (other than stock
       dividends), if any, paid on the Common Stock or for securities issued
       pursuant to exercise for fair value of options, warrants or restricted
       stock.


                                  EX 10.1A - 7
<PAGE>


       6. MANDATORY EXCHANGE.

              (a) MANDATORY EXCHANGE DATE. If (i) on or after the third year
       anniversary of the Original Issuance Date of any share of Series A
       Exchangeable Preferred Stock, or (ii) at any time on or after the 122nd
       day after such Original Issuance Date if the average of the closing bid
       prices for the Corporation's Common Stock on the Principal Market for
       twenty consecutive trading days ending on the trading day prior to the
       date provided for herein is at least $8.00 per share (adjusted for any
       splits or reverse splits) and the average daily trading volume on the
       Principal Market for the thirty trading days ending on the trading day
       prior to the date provided for herein is at least 50,000 shares (such
       date as selected by the Corporation being the "Mandatory Exchange Date"),
       there remain issued and outstanding any shares of Series A Exchangeable
       Preferred Stock and a registration statement permitting the resale by the
       holder of the Common Stock issuable upon such exchange is then effective
       and remains effective through the Mandatory Exchange Date, then the
       Corporation shall be entitled to require all (but not less than all)
       holders of shares of Series A Exchangeable Preferred Stock then
       outstanding to exchange their shares of Series A Exchangeable Preferred
       Stock for shares of Common Stock at the then effective Exchange Price
       pursuant to Section 5(a). The Corporation shall provide at least three
       (3) trading days' written notice (the "Mandatory Exchange Notice") to the
       holders of shares of Series A Exchangeable Preferred Stock of such
       mandatory exchange. The Mandatory Exchange Notice shall include (i) the
       Stated Value of the shares of Series A Exchangeable Preferred Stock to be
       exchanged, (ii) the Exchange Price (which for purposes of this subsection
       6(a), shall be the lesser of (A) the Set Price and (B) the average of the
       three lowest closing bid prices as reported by Bloomberg LP on the
       Principal Market during the prior thirty (30) consecutive trading days
       immediately prior to the Mandatory Exchange Date) at the Mandatory
       Exchange Date, and (iii) the number of shares of the Corporation's Common
       Stock to be issued upon such mandatory exchange at the then applicable
       Exchange Price. In lieu of a Mandatory Exchange, the Corporation may
       buy-out the shares of Series A Exchangeable Preferred Stock by means of
       such Mandatory Exchange Notice. The amount of cash to be paid in the
       event of a buy-out shall equal the average of the closing bid and asked
       prices of the Common Stock on the business day prior to the Mandatory
       Exchange Date times the number of shares which would have been issued
       upon a voluntary Exchange, but in no event shall such buy-out price yield
       the holder a total return on its investment of less than forty percent
       (40%). Notwithstanding the foregoing, in no event shall the Corporation
       exchange that portion of the Series A Exchangeable Preferred Stock to the
       extent that the issuance of Common Stock upon the exchange of such Series
       A Exchangeable Preferred Stock, when combined with shares of Common Stock
       received upon other exchanges of Series A Exchangeable Preferred Stock by
       such holder and any other holders of Series A Exchangeable Preferred
       Stock or upon exercise of the Stock Purchase Warrants referred to in
       Section 5(a), would exceed 19.9% of the Common Stock outstanding on the
       Original Issuance Date (unless stockholder approval has been obtained as
       described in Section 5(a)), or as to any individual holder, make such
       holder the beneficial owner of 9.9% or more of the Corporation's
       then-outstanding Common Stock.

              (b) SURRENDER OF CERTIFICATES. On or before the Mandatory Exchange
       Date, each holder of shares of Series A Exchangeable Preferred Stock
       shall surrender his or its certificate or certificates for all such
       shares to the Corporation at the place designated in such Mandatory
       Exchange Notice (or an affidavit of lost certificate in form and content
       reasonably satisfactory to the Corporation), and shall thereafter receive
       certificates for the number of shares of Common Stock to which such
       holder is entitled or, in the event of a buy-out by the Corporation, the
       amount of cash


                                  EX 10.1A - 8
<PAGE>


       such holder is entitled within three business days. On the Mandatory
       Exchange Date, all rights with respect to the Series A Exchangeable
       Preferred Stock so exchanged, including the rights, if any, to receive
       notices and vote, will terminate, provided that the Corporation either
       (i) delivers the shares of Common Stock to be delivered upon such
       Exchange within five (5) business days of the Mandatory Exchange Date or
       (ii) in the event of a buy-out in lieu of a Mandatory Exchange, delivers
       the buy-out price within five (5) business days of the Mandatory Exchange
       Date, and otherwise such Mandatory Exchange shall be void and the
       Corporation shall not thereafter have any further right to require a
       Mandatory Exchange. All certificates evidencing shares of Series A
       Exchangeable Preferred Stock that are required to be surrendered for
       Exchange in accordance with the provisions hereof, from and after the
       Mandatory Exchange Date, shall be deemed to have been retired and
       cancelled, notwithstanding the failure of the holder or holders thereof
       to surrender such certificates on or prior to such date. The Corporation
       may thereafter take such appropriate action as may be necessary to reduce
       the authorized Series A Exchangeable Preferred Stock accordingly.

       7. REDEMPTION OF SERIES A EXCHANGEABLE PREFERRED STOCK.

              (a) RIGHT TO REDEEM SERIES A EXCHANGEABLE PREFERRED STOCK. At any
       time and from time to time upon the earlier of (i) the financial closing
       of an underwritten public offering of the Corporation's Common Stock or
       (ii) six months after the Original Issuance Date, the Corporation may, in
       its sole discretion, but shall not be obligated to, redeem, in whole or
       in part, the then issued and outstanding shares of Series A Exchangeable
       Preferred Stock, at a price equal to 140% of the Stated Value, plus all
       accrued but unpaid dividends through the Redemption Date, unless the
       closing bid price on the Principal Market on the Redemption Date is less
       than the Market Price on the Original Issuance Date, in which event the
       Redemption Price shall be 125% of the Stated Value plus all accrued but
       unpaid dividends. In the event that the Corporation's Common Stock shall
       cease to be listed or quoted on a national securities exchange or The
       Nasdaq Stock Market, or a registration statement permitting resales by
       the holders of Exchange Shares is not effective within 180 days of the
       Original Issuance Date, then the Corporation shall, within fifteen (15)
       days of demand by any holder, redeem all of such holder's outstanding
       shares of Series A Exchangeable Preferred Stock at a price equal to 125%
       of the Stated Value, plus all accrued but unpaid dividends thereon
       through the Redemption Date. Such requested redemption shall be mandatory
       and the requesting holder of Series A Exchangeable Preferred Stock shall,
       from and after the Redemption Date, be a creditor of the Corporation for
       such purpose.

              (b) NOTICE OF REDEMPTION. The Corporation shall provide each
       holder of record of the Series A Exchangeable Preferred Stock being
       redeemed with written notice of redemption (the "Redemption Notice") not
       less than 10 days prior to any date stipulated by the Corporation for the
       redemption of the Series A Exchangeable Preferred Stock (the "Redemption
       Date"). The Redemption Notice shall contain (i) the Redemption Date, (ii)
       the number of shares of Series A Exchangeable Preferred Stock to be
       redeemed from the holder to whom the Redemption Notice is delivered,
       (iii) instructions for surrender to the Corporation of the certificate or
       certificates representing the shares of Series A Exchangeable Preferred
       Stock to be redeemed, and (iv) a procedure for the holder to specify the
       number of shares of Series A Exchangeable Preferred Stock to be exchanged
       into Common Stock pursuant to Section 5, subject to the limitation set
       forth in Section 7(c).


                                  EX 10.1A - 9
<PAGE>


              (c) RIGHT TO EXCHANGE SERIES A EXCHANGEABLE PREFERRED STOCK UPON
       RECEIPT OF REDEMPTION NOTICE. Upon receipt of the Redemption Notice, the
       recipient thereof shall have the option, at its sole election, to specify
       what portion of the Series A Exchangeable Preferred Stock called for
       redemption in the Redemption Notice shall be redeemed as provided in this
       Section 7 or exchanged for Common Stock in the manner provided in Section
       5 and limited to those shares which would otherwise be exchangeable
       pursuant to Section 5(b). If the holder of the Series A Exchangeable
       Preferred Stock called for redemption elects to exchange any of such
       shares then eligible for exchange, then such exchange shall take place on
       the Exchange Date specified by the holder, but in no event after the
       Redemption Date, in accordance with the terms of Section 5.

              (d) SURRENDER OF CERTIFICATES; PAYMENT OF REDEMPTION PRICE. On or
       before the Redemption Date, each holder of the shares of Series A
       Exchangeable Preferred Stock to be redeemed shall surrender the required
       certificate or certificates representing such shares to the Corporation
       (or an affidavit of lost certificate in form and content reasonably
       satisfactory to the Corporation), in the manner and at the place
       designated in the Redemption Notice, and upon payment to the holder of
       the Redemption Price, each such surrendered certificate shall be
       cancelled and retired. If payment of such redemption price is not made in
       full by the Redemption Date, the Corporation's right to redeem any Series
       A Exchangeable Preferred Stock shall cease and be void, and the Holder
       shall again have the right to exchange the Series A Exchangeable
       Preferred Stock as provided in Section 5 hereof. If a certificate is
       surrendered and all the shares evidenced thereby are not being redeemed,
       the Corporation shall issue new certificates to be registered in the
       names of the person(s) whose name(s) appear(s) as the owners on the
       respective surrendered certificates and deliver such certificate to such
       person(s).

       8. NOTICES. In case at any time:

              (a) the Corporation shall declare any dividend upon its Common
       Stock payable in cash or stock or make any other pro rata distribution to
       the holders of its Common Stock; or

              (b) the Corporation shall offer for subscription PRO RATA to the
       holders of its Common Stock any additional shares of stock of any class
       or other rights; or

              (c) there shall be any capital reorganization or reclassification
       of the capital stock of the Corporation, or a consolidation or merger of
       the Corporation with or into, or a sale of all or substantially all its
       assets to, another entity or entities; or

              (d) there shall be a voluntary or involuntary dissolution,
       liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or facsimile or by recognized overnight
delivery service to non-U.S. residents, addressed to each holder of any shares
of Series A Exchangeable Preferred Stock at the address of such holder as shown
on the books of the Corporation, (i) at least twenty (20) business days' prior
written notice of the date on which the books of the Corporation shall close or
a record shall be taken for such dividend, distribution or subscription rights
or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up


                                 EX 10.1A - 10
<PAGE>


and (ii) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least
twenty (20) business days' prior written notice of the date when the same shall
take place. Such notice in accordance with the foregoing clause (i) shall also
specify, in the case of any such dividend, distribution or subscription rights,
the date on which the holders of Common Stock shall be entitled thereto and (ii)
shall also specify the date on which the holders of Common Stock shall be
entitled to exchange their Common Stock for securities or other property
deliverable upon such reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding up, as the case may be.

       9. STOCK TO BE RESERVED. The Corporation, upon the effective date of this
Certificate of Designations, has a sufficient number of shares of Common Stock
available to reserve for issuance upon the exchange of all outstanding shares of
Series A Exchangeable Preferred Stock. The Corporation will at all times reserve
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the exchange of Series A Exchangeable Preferred Stock as herein
provided, such number of shares of Common Stock as shall then be issuable upon
the exchange of all outstanding shares of Series A Exchangeable Preferred. The
Corporation covenants that all shares of Common Stock which shall be so issued
shall be duly and validly issued, fully paid and non-assessable. The Corporation
will take all such action as may be so taken without violation of any applicable
law or regulation, or of any requirement of any national securities exchange
upon which the Common Stock may be listed to have a sufficient number of
authorized but unissued shares of Common Stock to issue upon exchange of the
Series A Exchangeable Preferred Stock. The Corporation will not take any action
which results in any adjustment of the exchange rights if the total number of
shares of Common Stock issued and issuable after such action upon exchange of
the Series A Exchangeable Preferred Stock would exceed the total number of
shares of Common Stock then authorized by the Corporation's Certificate of
Incorporation.

       10. NO REISSUANCE OF SERIES A EXCHANGEABLE PREFERRED STOCK. Shares of
Series A Exchangeable Preferred Stock which are exchanged for shares of Common
Stock as provided herein shall not be reissued.

       11. ISSUE TAX. The issuance of certificates for shares of Common Stock
upon exchange of Series A Exchangeable Preferred Stock shall be made without
charge to the holder for any United States issuance tax in respect thereof,
provided that the Corporation shall not be required to pay any tax which may be
payable in respect of any transfer involved in the issuance and delivery of any
certificate in a name other than that of the holder of the Series A Exchangeable
Preferred Stock which is being exchanged.

       12. CLOSING OF BOOKS. The Corporation will at no time close its transfer
books against the transfer of any Series A Exchangeable Preferred Stock or of
any shares of Common Stock issued or issuable upon the exchange of any shares of
Series A Exchangeable Preferred Stock in any manner which interferes with the
timely exchange of such Series A Exchangeable Preferred Stock, except as may
otherwise be required to comply with applicable securities laws.

       13. DEFINITIONS. As used in this Certificate of Designations, the term
"Common Stock" shall mean and include the Corporation's authorized Common Stock,
$0.001 par value per share, as constituted on the date of filing of these terms
of the Series A Exchangeable Preferred Stock, and


                                 EX 10.1A - 11
<PAGE>


shall also include any capital stock of any class of the Corporation thereafter
authorized which shall neither be limited to a fixed sum or percentage of par
value in respect of the rights of the holders thereof to participate in
dividends nor entitled to a preference in the distribution of assets upon the
voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Common Stock receivable upon exchange
of shares of Series A Exchangeable Preferred Stock shall include only shares
designated as Common Stock of the Corporation on the date of filing of this
instrument, or in case of any reorganization, reclassification, or stock split
of the outstanding shares thereof, the stock, securities or assets provided for
in Subparagraph 5(f) and (g). Any capitalized terms used in this Certificate of
Designations but not defined herein shall have the meanings set forth in that
certain Exchangeable Preferred Stock and Warrant Purchase Agreement dated as of
October 25, 1999 among the Corporation and the other persons signatory thereto,
a copy of which will be provided to any stockholder of the Corporation upon
request to the Secretary of the Corporation, without charge.

       14. LOSS, THEFT, DESTRUCTION OF PREFERRED STOCK. Upon receipt of evidence
satisfactory to the Corporation of the loss, theft, destruction or mutilation of
certificates representing shares of Series A Exchangeable Preferred Stock and,
in the case of any such loss, theft or destruction, upon receipt of indemnity or
security reasonably satisfactory to the Corporation, or, in the case of any such
mutilation, upon surrender and cancellation of the Series A Exchangeable
Preferred Stock certificate, the Corporation shall make, issue and deliver, in
lieu of such lost, stolen, destroyed or mutilated certificates for Series A
Exchangeable Preferred Stock, new certificates for Series A Exchangeable
Preferred Stock of like tenor. The Series A Exchangeable Preferred Stock shall
be held and owned upon the express condition that the provisions of this Section
14 are exclusive with respect to the replacement of mutilated, destroyed, lost
or stolen shares of Series A Preferred Stock and shall preclude any and all
other rights and remedies notwithstanding any law or statue existing or
hereafter enacted to the contrary with respect to the replacement of negotiable
instruments or other securities without the surrender thereof.

       15. WHO DEEMED ABSOLUTE OWNER. The Corporation may deem the person in
whose name the Series A Exchangeable Preferred Stock shall be registered upon
the registry books of the Corporation to be, and may treat it as, the absolute
owner of the Series A Exchangeable Preferred Stock for the purpose of exchange
of the Series A Exchangeable Preferred Stock and for all other purposes, and the
Corporation shall not be affected by any notice to the contrary. All such
payments and such exchange shall be valid and effectual to satisfy and discharge
the liability upon the Series A Exchangeable Preferred Stock to the extent of
the sum or sums so paid or the exchange so made.

       16. REGISTER. The Corporation shall maintain a transfer agent, which may
be the transfer agent for the Common Stock, for the registration of the Series A
Exchangeable Preferred Stock. Upon any transfer of the Series A Exchangeable
Preferred Stock in accordance with the provisions hereof, the Corporation shall
register or cause the transfer agent to register such transfer on the Series A
Exchangeable Preferred Stock register.

       17. WITHHOLDING. To the extent required by applicable law, the
Corporation may withhold amounts for or on account of any taxes imposed or
levied by or on behalf of any taxing authority in the United States having
jurisdiction over the Corporation from any payments made pursuant to the Series
A Exchangeable Preferred Stock.


                                 EX 10.1A - 12
<PAGE>



       18. HEADINGS. The headings of the Sections of this Certificate of
Designations are inserted for convenience only and do not constitute a part of
this Certificate of Designations.

       IN WITNESS WHEREOF, Robert H. Gurevitch, President and Chief Executive
Officer of the Corporation, under penalties of perjury, does hereby declare and
certify that this is the act and deed of the Corporation and the facts stated
herein are true and accordingly has signed this Certificate of Designations as
of this _____ day of November, 1999.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President and
                                             Chief Executive Officer


Attest:


By:
     -----------------------------------
     Robert H. Gurevitch, Secretary


                                 EX 10.1A - 13
<PAGE>


                                                                       EXHIBIT B

NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT")
OR ANY OTHER APPLICABLE SECURITIES LAWS IN RELIANCE UPON AN EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND SUCH OTHER SECURITIES LAWS.
NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF MAY BE SOLD,
PLEDGED, TRANSFERRED, ENCUMBERED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR IN A TRANSACTION
WHICH IS EXEMPT FROM REGISTRATION UNDER THE PROVISIONS OF THE SECURITIES ACT.



                             STOCK PURCHASE WARRANT


                To Purchase [________] Shares of Common Stock of

                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

       THIS CERTIFIES that, for value received, [_____________________] (the
"Holder"), is entitled, upon the terms and subject to the conditions hereinafter
set forth, at any time on or after March 15, 2000 (the "Initial Exercise Date")
and on or prior to the close of business on March 15, 2005 (the "Termination
Date") but not thereafter, to subscribe for and purchase from Dental/Medical
Diagnostic Systems, Inc., a corporation incorporated in Delaware (the
"Company"), up to [______________________________ (___________)] shares (the
"Warrant Shares") of Common Stock, $.01 par value, of the Company (the "Common
Stock"). The purchase price of one share of Common Stock (the "Exercise Price")
under this Warrant shall be $_________ (130% of the Market Price of the Common
Stock on the Closing Date of the Exchangeable Preferred Stock and Warrants
Purchase Agreement dated as of October 25, 1999 pursuant to which this Warrant
has been issued (the "Purchase Agreement")). The Exercise Price and the number
of shares for which the Warrant is exercisable shall be subject to adjustment as
provided herein. In the event of any conflict between the terms of this Warrant
and the Purchase Agreement, the Purchase Agreement shall control. Capitalized
terms used and not otherwise defined herein shall have the meanings set forth
for such terms in the Purchase Agreement.


<PAGE>


       1. TITLE TO WARRANT. Prior to the Termination Date and subject to
compliance with applicable laws and the terms of this Warrant, this Warrant and
all rights hereunder are transferable, in whole or in part, at the office or
agency of the Company by the holder hereof in person or by duly authorized
attorney, upon surrender of this Warrant together with the Assignment Form
annexed hereto properly endorsed.

       2. AUTHORIZATION OF SHARES. The Company covenants that all shares of
Common Stock which may be issued upon the exercise of rights represented by this
Warrant will, upon exercise of the rights represented by this Warrant, be duly
authorized, validly issued, fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

       3. EXERCISE OF WARRANT. Except as provided in Section 4 herein, exercise
of the purchase rights represented by this Warrant may be made at any time or
times on or after the Initial Exercise Date, and before the close of business on
the Termination Date by the surrender of this Warrant and the Notice of Exercise
Form annexed hereto duly executed, at the office of the Company (or such other
office or agency of the Company as it may designate by notice in writing to the
registered holder hereof at the address of such holder appearing on the books of
the Company) and upon payment of the Exercise Price of the shares thereby
purchased by wire transfer or cashier's check drawn on a United States bank, the
holder of this Warrant shall be entitled to receive a certificate for the number
of shares of Common Stock so purchased. Certificates for shares purchased
hereunder shall be delivered to the holder hereof within five (5) Trading Days
after the date on which this Warrant shall have been exercised as aforesaid.
This Warrant shall be deemed to have been exercised and such certificate or
certificates shall be deemed to have been issued, and Holder or any other person
so designated to be named therein shall be deemed to have become a holder of
record of such shares for all purposes, as of the date the Holder faxes a Notice
of Exercise to the Company, provided that such fax notice is followed by
delivery of the original notice and payment to the Company of the Exercise Price
and all taxes required to be paid by Holder, if any, pursuant to Section 5 prior
to the issuance of such shares, have been paid within three (3) Trading Days of
such fax notice. If this Warrant shall have been exercised in part, the Company
shall, at the time of delivery of the certificate or certificates representing
Warrant Shares, deliver to Holder a new Warrant evidencing the rights of Holder
to purchase the unpurchased shares of Common Stock called for by this Warrant,
which new Warrant shall in all other respects be identical with this Warrant. If
there is no registration in effect permitting the resale by the Holder of the
Warrant Shares at any time from and after one year from the issuance date of
this Warrant, then the Holder shall have the right to a "cashless exercise" in
which the Holder shall be entitled to receive a certificate for the number of
shares equal to the quotient obtained by dividing [(A-B) (X)] by (A), where:

(A) = the average of the high and low trading prices per share of Common Stock
on the Trading Day preceding the date of such election;

(B) = the Exercise Price of the Warrant; and


                                  EX 10.1B - 2
<PAGE>


(X) = the number of shares issuable upon exercise of the Warrant in accordance
with the terms of this Warrant.

       4. NO FRACTIONAL SHARES OR SCRIP. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant. As to any fraction of a share which Holder would otherwise be entitled
to purchase upon such exercise, the Company shall pay a cash adjustment in
respect of such final fraction in an amount equal to the Exercise Price.

       5. CHARGES, TAXES AND EXPENSES. Issuance of certificates for shares of
Common Stock upon the exercise of this Warrant shall be made without charge to
the holder hereof for any issue or federal or state transfer tax or other
incidental expense in respect of the issuance of such certificate, all of which
taxes and expenses shall be paid by the Company, and such certificates shall be
issued in the name of the holder of this Warrant or in such name or names as may
be directed by the holder of this Warrant; provided, however, that in the event
certificates for shares of Common Stock are to be issued in a name other than
the name of the holder of this Warrant, this Warrant when surrendered for
exercise shall be accompanied by the Assignment Form attached hereto duly
executed by the holder hereof; and the Company may require, as a condition
thereto, the payment of a sum sufficient to reimburse it for any transfer tax
incidental thereto.

       6. CLOSING OF BOOKS. The Company will not close its shareholder books or
records in any manner which prevents the timely exercise of this Warrant.

       7. TRANSFER, DIVISION AND COMBINATION. (a) the Holder (and its
transferees and assigns), by acceptance of this Warrant, covenants and agrees
that it is acquiring the Warrants evidenced hereby, and, upon exercise hereof,
the Warrant Shares, for its own account as an investment and not with a view to
distribution thereof. The Warrant Shares have not been registered under the
Securities Act or any state securities laws and no transfer of any Warrant
Shares shall be permitted unless the Company has received notice of such
transfer, at the address of its principal office set forth in the Purchase
Agreement, in the form of assignment attached hereto, accompanied by an opinion
of counsel reasonably satisfactory to the Company that an exemption from
registration of such Warrants or Warrant Shares under the Securities Act is
available for such transfer, except that no such opinion shall be required after
the registration for resale by the Holder of the Warrant Shares, as contemplated
by the Registration Rights Agreement. Upon any exercise of the Warrants,
certificates representing the Warrant Shares shall bear a restrictive legend
substantially identical to that set forth on the face of this Warrant
certificate. Any purported transfer of any Warrant or Warrant Shares not in
compliance with the provisions of this section shall be null and void.

              (b) This Warrant may be divided or combined with other Warrants
       upon presentation hereof at the aforesaid office of the Company, together
       with a written notice specifying the names and denominations in which new
       Warrants are to be issued, signed by Holder or its agent or attorney.
       Subject to compliance with Section 7(a), as to any transfer which may be
       involved in such division or combination, the Company shall execute and
       deliver a new Warrant or Warrants in exchange for the Warrant or Warrants
       to be divided or combined in accordance with such notice.


                                  EX 10.1B - 3
<PAGE>


              (c) The Company shall prepare, issue and deliver at its own
       expense (other than transfer taxes) the new Warrant or Warrants under
       this Section 7.

              (d) The Company agrees to maintain, at its aforesaid office, books
       for the registration and the registration of transfer of the Warrants.

       8. NO RIGHTS AS SHAREHOLDER UNTIL EXERCISE. This Warrant does not entitle
the holder hereof to any voting rights or other rights as a shareholder of the
Company prior to the exercise hereof. Upon the surrender of this Warrant and the
payment of the aggregate Exercise Price, the Warrant Shares so purchased shall
be and be deemed to be issued to such holder as the record owner of such shares
as of the close of business on the later of the date of such surrender or
payment.

       9. LOSS, THEFT, DESTRUCTION OR MUTILATION OF WARRANT. The Company
covenants that upon receipt by the Company of evidence reasonably satisfactory
to it of the loss, theft, destruction or mutilation of this Warrant certificate
or any stock certificate relating to the Warrant Shares, and in case of loss,
theft or destruction, of indemnity or security reasonably satisfactory to it
(which shall not exceed that customarily charged by the Company's transfer
agent), and upon surrender and cancellation of such Warrant or stock
certificate, if mutilated, the Company will make and deliver a new Warrant or
stock certificate of like tenor and dated as of such cancellation, in lieu of
such Warrant or stock certificate.

       10. SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or legal holiday.

       11. ADJUSTMENTS OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES. (a) STOCK
SPLITS, ETC. The number and kind of securities purchasable upon the exercise of
this Warrant and the Exercise Price shall be subject to adjustment from time to
time upon the happening of any of the following. In case the Company shall (i)
pay a dividend in shares of Common Stock or make a distribution in shares of
Common Stock to holders of its outstanding Common Stock, (ii) subdivide its
outstanding shares of Common Stock into a greater number of shares of Common
Stock, (iii) combine its outstanding shares of Common Stock into a smaller
number of shares of Common Stock or (iv) issue any shares of its capital stock
in a reclassification of the Common Stock, then the number of Warrant Shares
purchasable upon exercise of this Warrant immediately prior thereto shall be
adjusted so that the holder of this Warrant shall be entitled to receive the
kind and number of Warrant Shares or other securities of the Company which he
would have been entitled to receive had such Warrant been exercised in advance
thereof. Upon each such adjustment of the kind and number of Warrant Shares or
other securities of the Company which are purchasable hereunder, the holder of
this Warrant shall thereafter be entitled to purchase the number of Warrant
Shares or other securities resulting from such adjustment at an Exercise Price
per Warrant Share or other security obtained by multiplying the Exercise Price
in effect immediately prior to such adjustment by the number of Warrant Shares
purchasable pursuant hereto immediately prior to such adjustment and dividing by
the number of Warrant Shares or other securities of the Company resulting from
such adjustment. An adjustment made pursuant to


                                  EX 10.1B - 4
<PAGE>


this paragraph shall become effective immediately after the effective date of
such event retroactive to the record date, if any, for such event.

              (b) REORGANIZATION, RECLASSIFICATION, MERGER, CONSOLIDATION OR
       DISPOSITION OF ASSETS. In case the Company shall reorganize its capital,
       reclassify its capital stock, consolidate or merge with or into another
       corporation (where the Company is not the surviving corporation or where
       there is a change in or distribution with respect to the Common Stock of
       the Company), or sell, transfer or otherwise dispose of all or
       substantially all its property, assets or business to another corporation
       and, pursuant to the terms of such reorganization, reclassification,
       merger, consolidation or disposition of assets, shares of common stock of
       the successor or acquiring corporation, or any cash, shares of stock or
       other securities or property of any nature whatsoever (including warrants
       or other subscription or purchase rights) in addition to or in lieu of
       common stock of the successor or acquiring corporation ("Other
       Property"), are to be received by or distributed to the holders of Common
       Stock of the Company, then Holder shall have the right thereafter to
       receive, upon exercise of this Warrant, the number of shares of common
       stock of the successor or acquiring corporation or of the Company, if it
       is the surviving corporation, and Other Property receivable upon or as a
       result of such reorganization, reclassification, merger, consolidation or
       disposition of assets by a holder of the number of shares of Common Stock
       for which this Warrant is exercisable immediately prior to such event. In
       case of any such reorganization, reclassification, merger, consolidation
       or disposition of assets, the successor or acquiring corporation (if
       other than the Company) shall expressly assume the due and punctual
       observance and performance of each and every covenant and condition of
       this Warrant to be performed and observed by the Company and all the
       obligations and liabilities hereunder, subject to such modifications as
       may be deemed appropriate (as determined in good faith by resolution of
       the Board of Directors of the Company) in order to provide for
       adjustments of shares of Common Stock for which this Warrant is
       exercisable which shall be as nearly equivalent as practicable to the
       adjustments provided for in this Section 11. For purposes of this Section
       11, "common stock of the successor or acquiring corporation" shall
       include stock of such corporation of any class which is not preferred as
       to dividends or assets over any other class of stock of such corporation
       and which is not subject to redemption and shall also include any
       evidences of indebtedness, shares of stock or other securities which are
       convertible into or exchangeable for any such stock, either immediately
       or upon the arrival of a specified date or the happening of a specified
       event and any warrants or other rights to subscribe for or purchase any
       such stock. The foregoing provisions of this Section 11 shall similarly
       apply to successive reorganizations, reclassifications, mergers,
       consolidations or disposition of assets.

       12. VOLUNTARY ADJUSTMENT BY THE COMPANY. The Company may at any time
during the term of this Warrant, reduce the then current Exercise Price to any
amount and for any period of time deemed appropriate by the Board of Directors
of the Company.

       13. NOTICE OF ADJUSTMENT. Whenever the number of Warrant Shares or number
or kind of securities or other property purchasable upon the exercise of this
Warrant or the Exercise Price is adjusted, as herein provided, the Company shall
promptly mail by registered or certified mail, return receipt requested, to the
holder of this Warrant notice of such adjustment or adjustments setting forth
the number of Warrant Shares (and other securities or property) purchasable upon
the exercise of this Warrant and the Exercise Price of such Warrant Shares (and
other securities or property) after such adjustment, setting forth a brief
statement of the facts


                                  EX 10.1B - 5
<PAGE>


requiring such adjustment and setting forth the computation by which such
adjustment was made. Such notice, in the absence of manifest error, shall be
conclusive evidence of the correctness of such adjustment.

       14. NOTICE OF CORPORATE ACTION. If at any time:

              (a) the Company shall take a record of the holders of its Common
       Stock for the purpose of entitling them to receive a dividend or other
       distribution, or any right to subscribe for or purchase any evidences of
       its indebtedness, any shares of stock of any class or any other
       securities or property, or to receive any other right, or

              (b) there shall be any capital reorganization of the Company, any
       reclassification or recapitalization of the capital stock of the Company
       or any consolidation or merger of the Company with, or any sale, transfer
       or other disposition of all or substantially all the property, assets or
       business of the Company to, another corporation or,

              (c) there shall be a voluntary or involuntary dissolution,
       liquidation or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at
least 10 days' prior written notice of the record date for such dividend,
distribution or right or for determining rights to vote in respect of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, liquidation or winding up, and (ii) in the case of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, dissolution, liquidation or winding up, at least 10 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause also shall specify (i) the date on which
any such record is to be taken for the purpose of such dividend, distribution or
right, the date on which the holders of Common Stock shall be entitled to any
such dividend, distribution or right, and the amount and character thereof, and
(ii) the date on which any such reorganization, reclassification, merger,
consolidation, sale, transfer, disposition, dissolution, liquidation or winding
up is to take place and the time, if any such time is to be fixed, as of which
the holders of Common Stock shall be entitled to exchange their shares of Common
Stock for securities or other property deliverable upon such disposition,
dissolution, liquidation or winding up. Each such written notice shall be
sufficiently given if addressed to Holder at the last address of Holder
appearing on the books of the Company and delivered in accordance with Section
16(d).


                                  EX 10.1B - 6
<PAGE>


       15. AUTHORIZED SHARES. The Company covenants that during the period the
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any purchase rights under this Warrant. The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Warrant
Shares upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the Principal Market
upon which the Common Stock may be listed.

       The Company shall not by any action, including, without limitation,
amending its certificate of incorporation or through any reorganization,
transfer of assets, consolidation, merger, dissolution, issue or sale of
securities or any other voluntary action, avoid or seek to avoid the observance
or performance of any of the terms of this Warrant, but will at all times in
good faith assist in the carrying out of all such terms and in the taking of all
such actions as may be necessary or appropriate to protect the rights of Holder
against impairment. Without limiting the generality of the foregoing, the
Company will (a) not increase the par value of any shares of Common Stock
receivable upon the exercise of this Warrant above the amount payable therefor
upon such exercise immediately prior to such increase in par value, (b) take all
such action as may be necessary or appropriate in order that the Company may
validly and legally issue fully paid and nonassessable shares of Common Stock
upon the exercise of this Warrant, and (c) use its best efforts to obtain all
such authorizations, exemptions or consents from any public regulatory body
having jurisdiction thereof as may be necessary to enable the Company to perform
its obligations under this Warrant.

       Before taking any action which would cause an adjustment reducing the
current Exercise Price below the then par value, if any, of the shares of Common
Stock issuable upon exercise of the Warrants, the Company shall take any
corporate action which may be necessary in order that the Company may validly
and legally issue fully paid and non-assessable shares of such Common Stock at
such adjusted Exercise Price.

       Before taking any action which would result in an adjustment in the
number of shares of Common Stock for which this Warrant is exercisable or in the
Exercise Price, the Company shall obtain all such authorizations or exemptions
thereof, or consents thereto, as may be necessary from any public regulatory
body or bodies having jurisdiction thereof.

       16. MISCELLANEOUS.

              (a) JURISDICTION. This Warrant shall be binding upon any
       successors or assigns of the Company. This Warrant shall constitute a
       contract under the laws of Delaware without regard to its conflict of
       law, principles or rules, and be subject to arbitration pursuant to the
       terms set forth in the Purchase Agreement.


                                  EX 10.1B - 7
<PAGE>


              (b) RESTRICTIONS. The holder hereof acknowledges that the Warrant
       Shares acquired upon the exercise of this Warrant, if not registered,
       will have restrictions upon resale imposed by state and federal
       securities laws.

              (c) NONWAIVER AND EXPENSES. No course of dealing or any delay or
       failure to exercise any right hereunder on the part of Holder shall
       operate as a waiver of such right or otherwise prejudice Holder's rights,
       powers or remedies, notwithstanding all rights hereunder terminate on the
       Termination Date. If the Company fails to comply with any provision of
       this Warrant, the Company shall pay to Holder such amounts as shall be
       sufficient to cover any costs and expenses including, but not limited to,
       reasonable attorneys' fees, including those of appellate proceedings,
       incurred by Holder in collecting any amounts due pursuant hereto or in
       otherwise enforcing any of its rights, powers or remedies hereunder.

              (d) NOTICES. Any notice, request or other document required or
       permitted to be given or delivered to the holder hereof by the Company
       shall be delivered in accordance with the notice provisions of the
       Purchase Agreement.

              (e) LIMITATION OF LIABILITY. No provision hereof, in the absence
       of affirmative action by Holder to purchase shares of Common Stock, and
       no enumeration herein of the rights or privileges of Holder hereof, shall
       give rise to any liability of Holder for the purchase price of any Common
       Stock or as a stockholder of the Company, whether such liability is
       asserted by the Company or by creditors of the Company.

              (f) REMEDIES. Holder, in addition to being entitled to exercise
       all rights granted by law, including recovery of damages, will be
       entitled to specific performance of its rights under this Warrant. The
       Company agrees that monetary damages would not be adequate compensation
       for any loss incurred by reason of a breach by it of the provisions of
       this Warrant and hereby agrees to waive the defense in any action for
       specific performance that a remedy at law would be adequate.

              (g) SUCCESSORS AND ASSIGNS. Subject to applicable securities laws,
       this Warrant and the rights and obligations evidenced hereby shall inure
       to the benefit of and be binding upon the successors of the Company and
       the successors and permitted assigns of Holder. The provisions of this
       Warrant are intended to be for the benefit of all Holders from time to
       time of this Warrant and shall be enforceable by any such Holder or
       holder of Warrant Shares.

              (h) INDEMNIFICATION. The Company agrees to indemnify and hold
       harmless Holder from and against any liabilities, obligations, losses,
       damages, penalties, actions, judgments, suits, claims, costs, attorneys'
       fees, expenses and disbursements of any kind which may be imposed upon,
       incurred by or asserted against Holder in any manner relating to or
       arising out of any failure by the Company to perform or observe in any
       material respect any of its covenants, agreements, undertakings or
       obligations set forth in this Warrant; PROVIDED, HOWEVER, that the
       Company will not be liable hereunder to the extent that any liabilities,
       obligations, losses, damages, penalties, actions, judgments, suits,
       claims, costs, attorneys' fees, expenses or disbursements are found in a
       final non-appealable judgment by a court to have resulted from Holder's
       negligence, bad faith or willful misconduct.


                                  EX 10.1B - 8
<PAGE>


              (i) AMENDMENT. This Warrant may be modified or amended or the
       provisions hereof waived with the written consent of the Company and the
       Holder.

              (j) SEVERABILITY. Wherever possible, each provision of this
       Warrant shall be interpreted in such manner as to be effective and valid
       under applicable law, but if any provision of this Warrant shall be
       prohibited by or invalid under applicable law, such provision shall be
       ineffective to the extent of such prohibition or invalidity, without
       invalidating the remainder of such provisions or the remaining provisions
       of this Warrant.


                                  EX 10.1B - 9
<PAGE>


              (k) HEADINGS. The headings used in this Warrant are for the
       convenience of reference only and shall not, for any purpose, be deemed a
       part of this Warrant.

       IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officer thereunto duly authorized.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


Dated: November __, 1999                By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                 EX 10.1B - 10
<PAGE>


                               NOTICE OF EXERCISE

To:   Dental/Medical Diagnostic Systems, Inc.

       (1)___The undersigned hereby elects to purchase ________ shares of Common
Stock (the "Common Stock"), of Dental/Medical Diagnostic Systems, Inc. pursuant
to the terms of the attached Warrant, and tenders herewith payment of the
exercise price in full, together with all applicable transfer taxes, if any.

       (2)___Please issue a certificate or certificates representing said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:


          -----------------------------------
          (Name)

          -----------------------------------
          (Address)

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


Dated:


                                             -----------------------------------
                                             Signature


<PAGE>


                                 ASSIGNMENT FORM

                    (To assign the foregoing warrant, execute
                   this form and supply required information.
                 Do not use this form to exercise the warrant.)

       FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced
thereby are hereby assigned to

                                     whose address is
- -----------------------------------

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

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

                                              Dated:
                                                      --------------------, ----


          Holder's Signature:
                              -----------------------------------
          Holder's Address:
                              -----------------------------------

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


Signature Guaranteed:
                      -----------------------------------


NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank or trust company. Officers
of corporations and those acting in an fiduciary or other representative
capacity should file proper evidence of authority to assign the foregoing
Warrant.


<PAGE>


                                                                       EXHIBIT C

                          REGISTRATION RIGHTS AGREEMENT

       THIS REGISTRATION RIGHTS AGREEMENT, dated as of October 25, 1999, between
the investor or investors signatory hereto (each an "Investor" and together the
"Investors"), and Dental/Medical Diagnostic Systems, Inc. a Delaware corporation
(the "Company").

       WHEREAS, simultaneously with the execution and delivery of this
Agreement, the Investors are purchasing from the Company, pursuant to an
Exchangeable Preferred Stock and Warrants Purchase Agreement dated the date
hereof (the "Purchase Agreement"), $2,000,000 Stated Value of Exchangeable
Preferred Stock and Warrants to purchase up to 40,000 shares of the Company's
Common Stock and 2,500 shares of Common Stock (terms not defined herein shall
have the meanings ascribed to them in the Purchase Agreement); and

       WHEREAS, the Company desires to grant to the Investors the registration
rights set forth herein with respect to the shares of Common Stock issued at
Closing, the Exchange Shares of Common Stock issuable upon exchange of or as
dividends upon the Exchangeable Preferred Stock purchased pursuant to the
Purchase Agreement and shares of Common Stock issuable upon exercise of the
Warrants (hereinafter referred to as the "Stock" or "Securities" of the
Company).

       NOW, THEREFORE, the parties hereto mutually agree as follows:

       Section 1. REGISTRABLE SECURITIES. As used herein the term "Registrable
Security" means the Securities until (i) the Registration Statement has been
declared effective by the Commission, and all Securities have been disposed of
pursuant to the Registration Statement, (ii) all Securities have been sold under
circumstances under which all of the applicable conditions of Rule 144 (or any
similar provision then in force) under the Securities Act ("Rule 144") are met,
(iii) all Securities have been otherwise transferred to holders who may trade
such Securities without restriction under the Securities Act, and the Company
has delivered a new certificate or other evidence of ownership for such
Securities not bearing a restrictive legend or (iv) such time as, in the opinion
of counsel to the Company, all Securities may be sold without any time, volume
or manner limitations pursuant to Rule 144(k) (or any similar provision then in
effect) under the Securities Act. The term "Registrable Securities" means any
and/or all of the securities falling within the foregoing definition of a
"Registrable Security." In the event of any merger, reorganization,
consolidation, recapitalization or other change in corporate structure affecting
the Common Stock, such adjustment shall be deemed to be made in the definition
of "Registrable Security" as is appropriate in order to prevent any dilution or
enlargement of the rights granted pursuant to this Agreement.

       Section 2. RESTRICTIONS ON TRANSFER. Each Investor acknowledges and
understands that prior to the registration of the Securities as provided herein,
the Securities are "restricted securities" as defined in Rule 144 promulgated
under the Act. Each Investor understands that no disposition or transfer of the
Securities may be made by Investor in the absence of (i) an opinion of counsel
to the Investor, in form and substance reasonably satisfactory to the Company,
that such transfer may be made without registration under the Securities Act or
(ii) such registration.

       With a view to making available to the Investors the benefits of Rule 144
under the Securities Act or any other similar rule or regulation of the
Commission that may at any time permit the Investors to sell securities of the
Company to the public without registration ("Rule 144"), the Company agrees to:

              (a) comply with the provisions of paragraph (c)(1) of Rule 144;
       and


<PAGE>


              (b) file with the Commission in a timely manner all reports and
       other documents required to be filed with the Commission pursuant to
       Section 13 or 15(d) under the Exchange Act by companies subject to either
       of such sections, irrespective of whether the Company is then subject to
       such reporting requirements.

       Section 3. REGISTRATION RIGHTS WITH RESPECT TO THE SECURITIES.

              (a) The Company agrees that it will prepare and file with the
       Securities and Exchange Commission ("Commission"), within sixty (60) days
       after the Closing Date a registration statement (on Form S-3, or other
       appropriate registration statement form) under the Securities Act (the
       "Registration Statement"), at the sole expense of the Company (except as
       provided in Section 3(c) hereof), in respect of the Investors, so as to
       permit a public offering and resale of the Securities under the Act by
       the Investors as selling stockholders and not as underwriters.

              The Company shall use its best efforts to cause such Registration
       Statement to become effective within ninety (90) days from the Closing
       Date (or 120 days from the Closing Date if the SEC makes a "full review"
       of the Registration Statement), or, if earlier, within five (5) days of
       SEC clearance to request acceleration of effectiveness. The number of
       shares designated in the Registration Statement to be registered shall
       include all the Common Stock, the Warrant Shares, at least 175% of the
       number of shares issuable upon exchange of the Exchangeable Preferred
       Stock assuming exchange in full on the day prior to filing date of the
       Registration Statement, and such number of shares as the Company deems
       prudent for the purpose of issuing shares of Common Stock as dividends on
       the Exchangeable Preferred Stock, and shall include appropriate language
       regarding reliance upon Rule 416 to the extent permitted by the
       Commission. The Company will notify the Investors of the effectiveness of
       the Registration Statement within one Trading Day of such event. In the
       event that the number of shares so registered shall be less than 125% of
       the number of shares of Registrable Securities remaining unsold (using
       the Exchange Price of the Exchangeable Preferred Stock from time to
       time), then the Company shall be obligated to file, within thirty (30)
       days of such event, a further Registration Statement registering such
       remaining shares and shall use its best efforts to cause such additional
       Registration Statement to become effective within ninety (90) days of the
       date of such event.

              (b) The Company will maintain the Registration Statement or
       post-effective amendment filed under this Section 3 effective under the
       Securities Act until the earlier of (i) the date that none of the
       Securities covered by such Registration Statement are or may become
       issued and outstanding, (ii) the date that all of the Securities have
       been sold pursuant to such Registration Statement, (iii) the date the
       Investors receive an opinion of counsel to the Company, which counsel
       shall be reasonably acceptable to the Investors, that the Securities may
       be sold under the provisions of Rule 144 without limitation as to volume,
       (iv) all Securities have been otherwise transferred to persons who may
       trade such shares without restriction under the Securities Act, and the
       Company has delivered a new certificate or other evidence of ownership
       for such securities not bearing a restrictive legend, or (v) all
       Securities may be sold without any time, volume or manner limitations
       pursuant to Rule 144(k) or any similar provision then in effect under the
       Securities Act in the opinion of counsel to the Company, which counsel
       shall be reasonably acceptable to the Investor (the "Effectiveness
       Period").

              (c) All fees, disbursements and out-of-pocket expenses and costs
       incurred by the Company in connection with the preparation and filing of
       the Registration Statement under subparagraph 3(a) and in complying with
       applicable securities and Blue Sky laws (including, without limitation,
       all attorneys' fees of the Company) shall be borne by the Company. The
       Investors shall bear the cost of underwriting and/or brokerage discounts,
       fees and commissions, if any, applicable to the Securities being
       registered and the fees and expenses of their counsel. The Investors and
       their counsel shall have a reasonable


                                  EX 10.1C - 2
<PAGE>


       period, not to exceed five (5) Trading Days, to review the proposed
       Registration Statement or any amendment thereto, prior to filing with the
       Commission, and the Company shall provide each Investor with copies of
       any comment letters received from the Commission with respect thereto
       within two (2) Trading Days of receipt thereof. The Company shall qualify
       any of the Securities for sale in such states as any Investor reasonably
       designates and shall furnish indemnification in the manner provided in
       Section 6 hereof. However, the Company shall not be required to qualify
       in any state which will require an escrow or other restriction relating
       to the Company and/or the sellers, or which will require the Company to
       qualify to do business in such state or require the Company to file
       therein any general consent to service of process. The Company at its
       expense will supply the Investors with copies of the applicable
       Registration Statement and the prospectus included therein and other
       related documents in such quantities as may be reasonably requested by
       the Investors.

              (d) The Company shall not be required by this Section 3 to include
       any Investor's Securities in any Registration Statement which is to be
       filed if, in the opinion of counsel to the Company, the proposed offering
       or other transfer as to which such registration is requested is exempt
       from applicable federal and state securities laws and would result in all
       purchasers or transferees obtaining securities which are not "restricted
       securities", as defined in Rule 144 under the Securities Act.

              (e) In the event that (i) the Registration Statement to be filed
       by the Company pursuant to Section 3(a) above is not filed with the
       Commission within sixty (60) days from the Closing Date, (ii) such
       Registration Statement is not declared effective by the Commission within
       the earlier of ninety (90) days from the Closing Date (or 120 days from
       the Closing Date if the Commission makes a "full review" of the
       Registration Statement) or five (5) days of clearance by the Commission
       to request effectiveness, (iii) such Registration Statement is not
       maintained as effective by the Company for the period set forth in
       Section 3(b) above or (iv) the additional Registration Statement referred
       to in Section 3(a) is not filed within thirty (30) days or declared
       effective within ninety (90) days as set forth therein (each a
       "Registration Default") then the Company will pay Investor (pro rated on
       a daily basis), as liquidated damages for such failure and not as a
       penalty one percent (1%) of the aggregate market value of shares of
       Common Stock purchased from the Company (including the Exchange Shares
       which would be issuable upon Exchange of the Exchangeable Preferred Stock
       on any date of determination, and whether or not the Exchangeable
       Preferred Stock are then exchangeable pursuant to their terms) and held
       by the Investor for each week until such Registration Statement has been
       filed, and in the event of late effectiveness (in case of clause (ii)
       above) or lapsed effectiveness (in the case of clause (iii) above), one
       percent (1%) of the aggregate market value of shares of Common Stock
       purchased from the Company and held by the Investor (including the
       Exchange Shares which would be issuable upon exchange of the Exchangeable
       Preferred Stock on any date of determination, and whether or not the
       Exchangeable Preferred Stock are then exchangeable pursuant to their
       terms) for each week (regardless of whether one or more such Registration
       Defaults are then in existence) until such Registration Statement has
       been declared effective. Such payment of the liquidated damages shall be
       made to the Investors in cash, within five (5) calendar days of demand,
       provided, however, that the payment of such liquidated damages shall not
       relieve the Company from its obligations to register the Securities
       pursuant to this Section. The market value of the Common Stock for this
       purpose shall be the closing price (or last trade, if so reported) on the
       Principal Market for each day during such Registration Default.
       Notwithstanding anything to the contrary contained herein, a failure to
       obtain or maintain the effectiveness of a filed Registration Statement or
       the ability of an Investor to use an otherwise effective Registration
       Statement to effect resales of Securities during the period after 45 days
       and within 90 days from the end of the Company's fiscal year resulting
       solely from the need to update the Company's financial statements
       contained or incorporated by reference in such Registration Statement
       shall not constitute a Registration Default and shall not trigger the
       accrual of liquidated damages hereunder.

              If the Company does not remit the payment to the Investors as set
       forth above, the Company will pay the Investors reasonable costs of
       collection, including attorneys' fees, in addition to the


                                  EX 10.1C - 3
<PAGE>


       liquidated damages. The registration of the Securities pursuant to this
       provision shall not affect or limit the Investors' other rights or
       remedies as set forth in this Agreement.

              (f) No provision contained herein shall preclude the Company from
       selling securities pursuant to any Registration Statement in which it is
       required to include Securities pursuant to this Section 3.

              (g) If at any time or from time to time after the effective date
       of any Registration Statement, the Company notifies the Investors in
       writing of the existence of a Potential Material Event (as defined in
       Section 3(h) below), the Investors shall not offer or sell any Securities
       or engage in any other transaction involving or relating to Securities,
       from the time of the giving of notice with respect to a Potential
       Material Event until the Investors receive written notice from the
       Company that such Potential Material Event either has been disclosed to
       the public or no longer constitutes a Potential Material Event; provided,
       however, that the Company may not so suspend the right to such holders of
       Securities for more than thirty (30) days in the aggregate (90 days in
       the case of an acquisition requiring the filing of audited financial
       statements of the acquired business under Form 8-K) during any twelve
       month period, during the period the Registration Statement is required to
       be in effect, and if such period is exceeded, such event shall be a
       Registration Default. If a Potential Material Event shall occur prior to
       the date a Registration Statement is required to be filed, then the
       Company's obligation to file such Registration Statement shall be delayed
       without penalty for not more than twenty (20) days, and such delay or
       delays shall not constitute a Registration Default. The Company must, if
       lawful, give the Investors notice in writing at least two (2) Trading
       Days prior to the first day of the blackout period.

              (h) "Potential Material Event" means any of the following: (a) the
       possession by the Company of material information not ripe for disclosure
       in a registration statement, as determined in good faith by the Chief
       Executive Officer or the Board of Directors of the Company that
       disclosure of such information in a Registration Statement would be
       detrimental to the business and affairs of the Company; or (b) any
       material engagement or activity by the Company which would, in the good
       faith determination of the Chief Executive Officer or the Board of
       Directors of the Company, be adversely affected by disclosure in a
       registration statement at such time.

       Section 4. COOPERATION WITH COMPANY. The Investors will cooperate with
the Company in all respects in connection with this Agreement, including timely
supplying all information and confirmations reasonably requested by the Company
or the Commission (which shall include all information regarding the Investors
and proposed manner of sale of the Registrable Securities required to be
disclosed in any Registration Statement) and executing and returning all
documents reasonably requested in connection with the registration and sale of
the Registrable Securities and entering into and performing their obligations
under any underwriting agreement, if the offering is an underwritten offering,
in usual and customary form, with the managing underwriter or underwriters of
such underwritten offering. Nothing in this Agreement shall obligate any
Investor to consent to be named as an underwriter in any Registration Statement.
The obligation of the Company to register the Registrable Securities shall be
absolute and unconditional as to those Securities which the Commission will
permit to be registered without naming the Investors as underwriters. Any delay
or delays caused by the Investors by failure to cooperate as required hereunder
shall not constitute a Registration Default.

       Section 5. REGISTRATION PROCEDURES. If and whenever the Company is
required by any of the provisions of this Agreement to effect the registration
of any of the Registrable Securities under the Act, the Company shall (except as
otherwise provided in this Agreement), as expeditiously as possible, subject to
the Investors' assistance and cooperation as reasonably required with respect to
each Registration Statement:


                                  EX 10.1C - 4
<PAGE>


              (a) (i) prepare and file with the Commission such amendments and
       supplements to the Registration Statement and the prospectus used in
       connection therewith as may be necessary to keep such Registration
       Statement effective and to comply with the provisions of the Act with
       respect to the sale or other disposition of all securities covered by
       such registration statement whenever the Investors shall desire to sell
       or otherwise dispose of the same (including prospectus supplements with
       respect to the sales of securities from time to time in connection with a
       registration statement pursuant to Rule 415 promulgated under the Act)
       and (ii) take all lawful action such that each of (A) the Registration
       Statement and any amendment thereto does not, when it becomes effective,
       contain an untrue statement of a material fact or omit to state a
       material fact required to be stated therein or necessary to make the
       statements therein, in light of the circumstances under which they were
       made, not misleading and (B) the prospectus forming part of the
       Registration Statement, and any amendment or supplement thereto, does not
       at any time during the Registration Period include an untrue statement of
       a material fact or omit to state a material fact required to be stated
       therein or necessary to make the statements therein, in light of the
       circumstances under which they were made, not misleading;

              (b) (i) prior to the filing with the Commission of any
       Registration Statement (including any amendments thereto) and the
       distribution or delivery of any prospectus (including any supplements
       thereto), provide draft copies thereof to the Investors as required by
       Section 3(c) and reflect in such documents all such comments as the
       Investors (and their counsel) reasonably may propose respecting the
       Selling Shareholders and Plan of Distribution sections (or equivalents)
       and (ii) furnish to each Investor such numbers of copies of a prospectus
       including a preliminary prospectus or any amendment or supplement to any
       prospectus, as applicable, in conformity with the requirements of the
       Act, and such other documents, as such Investor may reasonably request in
       order to facilitate the public sale or other disposition of the
       securities owned by such Investor;

              (c) register and qualify the Registrable Securities covered by the
       Registration Statement under such other securities or blue sky laws of
       such jurisdictions as the Investors shall reasonably request (subject to
       the limitations set forth in Section 3(c) above), and do any and all
       other acts and things which may be necessary or advisable to enable each
       Investor to consummate the public sale or other disposition in such
       jurisdiction of the securities owned by such Investor;

              (d) list such Registrable Securities on the Principal Market, if
       the listing of such Registrable Securities is then permitted under the
       rules of such Principal Market;

              (e) notify each Investor at any time when a prospectus relating
       thereto covered by the Registration Statement is required to be delivered
       under the Act, of the happening of any event of which it has knowledge as
       a result of which the prospectus included in the Registration Statement,
       as then in effect, includes an untrue statement of a material fact or
       omits to state a material fact required to be stated therein or necessary
       to make the statements therein not misleading in the light of the
       circumstances then existing, and the Company shall use its best efforts
       to prepare and file a curative amendment under Section 5(a);

              (f) as promptly as practicable after becoming aware of such event,
       notify each Investor who holds Registrable Securities being sold (or, in
       the event of an underwritten offering, the managing underwriters) of the
       issuance by the Commission of any stop order or other suspension of the
       effectiveness of the Registration Statement at the earliest possible time
       and take all lawful action to effect the withdrawal, recession or removal
       of such stop order or other suspension;

              (g) cooperate with the Investors to facilitate the timely
       preparation and delivery of certificates for the Registrable Securities
       to be offered pursuant to the Registration Statement and enable such
       certificates for the Registrable Securities to be in such denominations
       or amounts, as the case may be, as the Investors reasonably may request
       and registered in such names as the Investors may request; and,


                                  EX 10.1C - 5
<PAGE>


       within three (3) Trading Days after a Registration Statement which
       includes Registrable Securities is declared effective by the Commission,
       deliver and cause legal counsel selected by the Company to deliver to the
       transfer agent for the Registrable Securities (with copies to the
       Investors) an appropriate instruction and, to the extent necessary, an
       opinion of such counsel;

              (h) take all such other lawful actions reasonably necessary to
       expedite and facilitate the disposition by the Investors of their
       Registrable Securities in accordance with the intended methods therefor
       provided in the prospectus which are customary for issuers to perform
       under the circumstances;

              (i) in the event of an underwritten offering, promptly include or
       incorporate in a prospectus supplement or post-effective amendment to the
       Registration Statement such information as the managers reasonably agree
       should be included therein and to which the Company does not reasonably
       object and make all required filings of such prospectus supplement or
       post-effective amendment as soon as practicable after it is notified of
       the matters to be included or incorporated in such Prospectus supplement
       or post-effective amendment; and

              (j) maintain a transfer agent and registrar for its Common Stock.

       Section 6. INDEMNIFICATION.

              (a) To the maximum extent permitted by law, the Company agrees to
       indemnify and hold harmless the Investors and each person, if any, who
       controls an Investor within the meaning of the Securities Act (each a
       "Distributing Investor") against any losses, claims, damages or
       liabilities, joint or several (which shall, for all purposes of this
       Agreement, include, but not be limited to, all reasonable costs of
       defense and investigation and all reasonable attorneys' fees and
       expenses), to which the Distributing Investor may become subject, under
       the Securities Act or otherwise, insofar as such losses, claims, damages
       or liabilities (or actions in respect thereof) arise out of or are based
       upon any untrue statement or alleged untrue statement of any material
       fact contained in any Registration Statement, or any related final
       prospectus or amendment or supplement thereto, or arise out of or are
       based upon the omission or alleged omission to state therein a material
       fact required to be stated therein or necessary to make the statements
       therein not misleading; provided, however, that the Company will not be
       liable in any such case to the extent, and only to the extent, that any
       such loss, claim, damage or liability arises out of or is based upon an
       untrue statement or alleged untrue statement or omission or alleged
       omission made in such Registration Statement, preliminary prospectus,
       final prospectus or amendment or supplement thereto in reliance upon, and
       in conformity with, written information furnished to the Company by the
       Distributing Investor, its counsel, affiliates or any underwriter,
       specifically for use in the preparation thereof. This indemnity agreement
       will be in addition to any liability which the Company may otherwise
       have.

              (b) To the maximum extent permitted by law, each Distributing
       Investor agrees that it will indemnify and hold harmless the Company, and
       each officer and director of the Company or person, if any, who controls
       the Company within the meaning of the Securities Act, against any losses,
       claims, damages or liabilities (which shall, for all purposes of this
       Agreement, include, but not be limited to, all reasonable costs of
       defense and investigation and all reasonable attorneys' fees and
       expenses) to which the Company or any such officer, director or
       controlling person may become subject under the Securities Act or
       otherwise, insofar as such losses, claims, damages or liabilities (or
       actions in respect thereof) arise out of or are based upon any untrue
       statement or alleged untrue statement of any material fact contained in
       any Registration Statement, or any related final prospectus or amendment
       or supplement thereto, or arise out of or are based upon the omission or
       the alleged omission to state therein a material fact required to be
       stated therein or necessary to make the statements therein not
       misleading, but in each case only to the extent that such untrue
       statement or alleged untrue statement or omission or alleged omission was
       made in such


                                  EX 10.1C - 6
<PAGE>


       Registration Statement, final prospectus or amendment or supplement
       thereto in reliance upon, and in conformity with, written information
       furnished to the Company by such Distributing Investor, its counsel,
       affiliates or any underwriter, specifically for use in the preparation
       thereof. This indemnity agreement will be in addition to any liability
       which the Distributing Investor may otherwise have.

              (c) Promptly after receipt by an indemnified party under this
       Section 6 of notice of the commencement of any action against such
       indemnified party, such indemnified party will, if a claim in respect
       thereof is to be made against the indemnifying party under this Section
       6, notify the indemnifying party in writing of the commencement thereof;
       but the omission to so notify the indemnifying party will not relieve the
       indemnifying party from any liability which it may have to any
       indemnified party except to the extent the failure of the indemnified
       party to provide such written notification actually prejudices the
       ability of the indemnifying party to defend such action. In case any such
       action is brought against any indemnified party, and it notifies the
       indemnifying party of the commencement thereof, the indemnifying party
       will be entitled to participate in, and, to the extent that it may wish,
       jointly with any other indemnifying party similarly notified, assume the
       defense thereof, subject to the provisions herein stated and after notice
       from the indemnifying party to such indemnified party of its election so
       to assume the defense thereof, the indemnifying party will not be liable
       to such indemnified party under this Section 6 for any legal or other
       expenses subsequently incurred by such indemnified party in connection
       with the defense thereof other than reasonable costs of investigation,
       unless the indemnifying party shall not pursue the action to its final
       conclusion. The indemnified parties as a group shall have the right to
       employ one separate counsel in any such action and to participate in the
       defense thereof, but the fees and expenses of such counsel shall not be
       at the expense of the indemnifying party if the indemnifying party has
       assumed the defense of the action with counsel reasonably satisfactory to
       the indemnified party unless (i) the employment of such counsel has been
       specifically authorized in writing by the indemnifying party, or (ii) the
       named parties to any such action (including any impleaded parties)
       include both the indemnified party and the indemnifying party and the
       indemnified party shall have been advised by its counsel that there may
       be one or more legal defenses available to the indemnifying party
       different from or in conflict with any legal defenses which may be
       available to the indemnified party or any other indemnified party (in
       which case the indemnifying party shall not have the right to assume the
       defense of such action on behalf of such indemnified party, it being
       understood, however, that the indemnifying party shall, in connection
       with any one such action or separate but substantially similar or related
       actions in the same jurisdiction arising out of the same general
       allegations or circumstances, be liable only for the reasonable fees and
       expenses of one separate firm of attorneys for the indemnified party,
       which firm shall be designated in writing by the indemnified party). No
       settlement of any action against an indemnified party shall be made
       without the prior written consent of the indemnified party, which consent
       shall not be unreasonably withheld so long as such settlement includes a
       full release of claims against the indemnified party.

       Section 7. CONTRIBUTION. In order to provide for just and equitable
contribution under the Securities Act in any case in which (i) the indemnified
party makes a claim for indemnification pursuant to Section 6 hereof but is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that the express provisions of Section 6 hereof provide
for indemnification in such case, or (ii) contribution under the Securities Act
may be required on the part of any indemnified party, then the Company and the
applicable Distributing Investor shall contribute to the aggregate losses,
claims, damages or liabilities to which they may be subject (which shall, for
all purposes of this Agreement, include, but not be limited to, all reasonable
costs of defense and investigation and all reasonable attorneys' fees and
expenses), in either such case (after contribution from others) on the basis of
relative fault as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company on the one hand or the applicable Distributing Investor on the other
hand, and the parties'


                                  EX 10.1C - 7
<PAGE>


relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Company and the Distributing Investor
agree that it would not be just and equitable if contribution pursuant to this
Section 7 were determined by pro rata allocation or by any other method of
allocation which does not take account of the equitable considerations referred
to in this Section 7. The amount paid or payable by an indemnified party as a
result of the losses, claims, damages or liabilities (or actions in respect
thereof) referred to above in this Section 7 shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.

       Notwithstanding any other provision of this Section 7, in no event shall
any (i) Investor be required to undertake liability to any person under this
Section 7 for any amounts in excess of the dollar amount of the proceeds
received by such Investor from the sale of such Investor's Registrable
Securities (after deducting any fees, discounts and commissions applicable
thereto) pursuant to any Registration Statement under which such Registrable
Securities are registered under the Securities Act and (ii) underwriter be
required to undertake liability to any person hereunder for any amounts in
excess of the aggregate discount, commission or other compensation payable to
such underwriter with respect to the Registrable Securities underwritten by it
and distributed pursuant to such Registration Statement.

       Section 8. NOTICES. All notices, demands, requests, consents, approvals,
and other communications required or permitted hereunder shall be in writing
and, unless otherwise specified herein, shall be (i) hand delivered, (ii)
deposited in the mail, registered or certified, return receipt requested,
postage prepaid, (iii) delivered by reputable air courier service with charges
prepaid, or (iv) transmitted by facsimile, addressed as set forth in the
Purchase Agreement or to such other address as such party shall have specified
most recently by written notice. Any notice or other communication required or
permitted to be given hereunder shall be deemed effective (a) upon hand delivery
or delivery by facsimile, with accurate confirmation generated by the
transmitting facsimile machine, at the address or number designated in the
Purchase Agreement (if delivered on a business day during normal business hours
where such notice is to be received), or the first business day following such
delivery (if delivered other than on a business day during normal business hours
where such notice is to be received) or (b) on the first business day following
the date of sending by reputable courier service, fully prepaid, addressed to
such address, or (c) upon actual receipt of such mailing, if mailed. Either
party hereto may from time to time change its address or facsimile number for
notices under this Section 8 by giving at least ten (10) days' prior written
notice of such changed address or facsimile number to the other party hereto.

       Section 9. ASSIGNMENT. This Agreement is binding upon and inures to the
benefit of the parties hereto and their respective heirs, successors and
permitted assigns. The rights granted the Investors under this Agreement may be
assigned to any purchaser of substantially all of the Registrable Securities (or
the rights thereto) from an Investor, as otherwise permitted by the Purchase
Agreement.

       Section 10. ADDITIONAL COVENANTS OF THE COMPANY. The Company agrees that
at such time as it otherwise meets the requirements for the use of Securities
Act Registration Statement on Form S-3 for the purpose of registering the
Registrable Securities, it shall file all reports and information required to be
filed by it with the Commission in a timely manner and take all such other
action so as to maintain such eligibility for the use of such form.

       Section 11. COUNTERPARTS/FACSIMILE. This Agreement may be executed in two
or more counterparts, each of which shall constitute an original, but all of
which, when together shall constitute but one and the same instrument, and shall
become effective when one or more counterparts have been signed by


                                  EX 10.1C - 8
<PAGE>


each party hereto and delivered to the other parties. In lieu of the original, a
facsimile transmission or copy of the original shall be as effective and
enforceable as the original.

       Section 12. REMEDIES. The remedies provided in this Agreement are
cumulative and not exclusive of any remedies provided by law. If any term,
provision, covenant or restriction of this Agreement is held by a court of
competent jurisdiction to be invalid, illegal, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions set forth herein
shall remain in full force and effect and shall in no way be affected, impaired
or invalidated, and the parties hereto shall use their best efforts to find and
employ an alternative means to achieve the same or substantially the same result
as that contemplated by such term, provision, covenant or restriction.

       Section 13. CONFLICTING AGREEMENTS. The Company shall not enter into any
agreement with respect to its securities that is inconsistent with the rights
granted to the holders of Registrable Securities in this Agreement or otherwise
prevents the Company from complying with all of its obligations hereunder.

       Section 14. HEADINGS. The headings in this Agreement are for reference
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement.

       Section 15. GOVERNING LAW, ARBITRATION. This Agreement shall be governed
by and construed in accordance with the laws of the State of New York applicable
to contracts made in New York by persons domiciled in New York City and without
regard to its principles of conflicts of laws. Any dispute under this Agreement
shall be submitted to arbitration under the American Arbitration Association
(the "AAA") in New York City, New York, and shall be finally and conclusively
determined by the decision of a board of arbitration consisting of three (3)
members (hereinafter referred to as the "Board of Arbitration") selected as
according to the rules governing the AAA. The Board of Arbitration shall meet on
consecutive business days in New York City, New York, and shall reach and render
a decision in writing (concurred in by a majority of the members of the Board of
Arbitration) with respect to the amount, if any, which the losing party is
required to pay to the other party in respect of a claim filed. In connection
with rendering its decisions, the Board of Arbitration shall adopt and follow
the laws of the State of New York. To the extent practical, decisions of the
Board of Arbitration shall be rendered no more than thirty (30) calendar days
following commencement of proceedings with respect thereto. The Board of
Arbitration shall cause its written decision to be delivered to all parties
involved in the dispute. Any decision made by the Board of Arbitration (either
prior to or after the expiration of such thirty (30) calendar day period) shall
be final, binding and conclusive on the parties to the dispute, and entitled to
be enforced to the fullest extent permitted by law and entered in any court of
competent jurisdiction. The Board of Arbitration shall be authorized and is
hereby directed to enter a default judgment against any party failing to
participate in any proceeding hereunder within the time periods set forth in the
AAA rules. The non-prevailing party to any arbitration (as determined by the
Board of Arbitration) shall pay the expenses of the prevailing party, including
reasonable attorneys' fees, in connection with such arbitration. Any party shall
be entitled to obtain injunctive relief from a court in any case where such
relief is available. The non-prevailing party to any injunctive proceeding (as
determined by the court) shall pay the expenses of the prevailing party,
including reasonable attorney's fees, in connection with such injunctive
proceeding.


                                  EX 10.1C - 9
<PAGE>


       IN WITNESS WHEREOF, the parties hereto have caused this Registration
Rights Agreement to be duly executed, on the day and year first above written.


                                       Dental/Medical Diagnostic Systems, Inc.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                       AMRO International, S.A.


                                        By:
                                             -----------------------------------
                                             H.U. Bachofen, Director


                                       The Endeavour Capital Fund, S.A.


                                        By:
                                             -----------------------------------
                                             Shmuli Margulies, Authorized
                                             Signatory


                                        Austinvest Anstalt Balzers


                                        By:
                                             -----------------------------------
                                             Dr. Walter Grill, Authorized
                                             Signatory


                                        Esquire Trade & Finance Inc.


                                        By:
                                             -----------------------------------
                                             Roland Winiger, Authorized
                                             Signatory


                                 EX 10.1C - 10
<PAGE>


                                                                       EXHIBIT D

                                ESCROW AGREEMENT

       THIS ESCROW AGREEMENT (this "Agreement") is made as of October 25, 1999
by and among Dental/Medical Diagnostic Systems, Inc., a corporation incorporated
under the laws of the State of Delaware (the "Company"), the investors signatory
hereto (each an "Investor" and together the "Investors"), and Epstein Becker &
Green, P.C., (the "Escrow Agent"). Capitalized terms used but not defined herein
shall have the meanings set forth in the Exchangeable Preferred Stock and
Warrants Purchase Agreement referred to in the first recital.

                              W I T N E S S E T H:

       WHEREAS, the Investors will be purchasing from the Company 2,500 shares
of Common Stock, 2,000 shares of Exchangeable Preferred Stock (the "Exchangeable
Preferred Stock") and Warrants to purchase, in the aggregate, up to 40,000
shares of Common Stock, at the purchase price set forth in the Exchangeable
Preferred Stock and Warrants Purchase Agreement (the "Purchase Agreement") dated
the date hereof between the Investors and the Company, which will be issued as
per the terms contained herein and in the Purchase Agreement; and

       WHEREAS, it is intended that the purchase of the securities be
consummated in accordance with the requirements set forth by Sections 4(2)
and/or 4(6) and/or Regulation D promulgated under the Securities Act of 1933, as
amended; and

       WHEREAS, the Company and the Investors have requested that the Escrow
Agent hold the Purchase Price with respect to the Closing in escrow until the
Escrow Agent has received the certificates representing the Common Stock, the
Exchangeable Preferred Stock, the Warrants and certain other closing documents
specified herein;

       NOW, THEREFORE, in consideration of the covenants and mutual promises
contained herein and other good and valuable consideration, the receipt and
legal sufficiency of which are hereby acknowledged and intending to be legally
bound hereby, the parties agree as follows:

                                   ARTICLE 1

                               TERMS OF THE ESCROW

       1.1. The parties hereby agree to establish an escrow account with the
Escrow Agent whereby the Escrow Agent shall hold the funds for the purchase of
the 2,500 shares of Common Stock, 2,000 shares of Exchangeable Preferred Stock
and the Warrants at the Closing, as contemplated by the Purchase Agreement.

       1.2. (a) At the Closing, upon Escrow Agent's receipt of the Purchase
Price for the Closing into its attorney trustee account from the Investors,
together with executed counterparts of this Agreement, the Purchase Agreement
and the Registration Rights Agreement, it shall telephonically and by e-mail
advise the Company, or the Company's designated attorney or agent, of the amount
of funds it has received into its account.


<PAGE>


              (b) Wire transfers to the Escrow Agent shall be made as follows:

                    Epstein Becker & Green, P.C.
                    Master Escrow Account
                    Chase Manhattan Bank
                    1411 Broadway - Fifth Floor
                    New York, New York  10018
                    ABA No. 021000021
                    Account No. 035-1-346036
                    Attention:  L. Borneo

       1.3. The Company, upon receipt of said notice, shall deliver to the
Escrow Agent the certificates representing the Common Stock, the Exchangeable
Preferred Stock and the Warrants to be issued to each Investor at the Closing
together with:e

                     (i)    the original executed Registration Rights Agreement
                            in the form of Exhibit C to the Purchase Agreement;

                     (ii)   Instructions to Transfer Agent in the form of
                            Exhibit F to the Purchase Agreement;

                     (iii)  the original executed opinion of Troop Steuber
                            Pasich Reddick & Tobey, LLP, in the form of Exhibit
                            E to the Purchase Agreement;

                     (iv)   an original counterpart of this Escrow Agreement;
                            and

                     (v)    the voting agreements set forth in Section
                            2.1(b)(xi) of the Purchase Agreement.

       In the event that the foregoing items are not in the Escrow Agent's
possession within three (3) Trading Days of the Escrow Agent notifying the
Company that the Escrow Agent has custody of the Purchase Price, then each
Investor shall have the right to demand the return of said sum.

       1.4. At the Closing, once Escrow Agent confirms the validity of the
issuance of the Common Stock, the Exchangeable Preferred Shares and the Warrants
by means of its receipt of a Release Notice in the form attached hereto as
Exhibit X executed by the Company and each Investor, it shall enter the Exercise
Price on the face of each Warrant, insert the Original Issuance Date on the face
of the certificates representing the Exchangeable Preferred Stock, and then wire
that amount of funds necessary to purchase the Common Stock, the Exchangeable
Preferred Stock and the Warrants per the written instructions of the Company.

       Once the funds (as set forth above) have been sent per the Company's
instructions, the Escrow Agent shall then arrange to have the Common Stock
certificates, the Exchangeable Preferred Stock certificates, the Warrants, the
Registration Rights Agreement and the opinion of counsel delivered as per
instructions from the Investors and to deliver the Instructions to Transfer
Agent to the Transfer Agent.

                                   ARTICLE 2

                                  MISCELLANEOUS

       2.1. No waiver or any breach of any covenant or provision herein
contained shall be deemed a waiver of any preceding or succeeding breach
thereof, or of any other covenant or provision


                                  EX 10.1D - 2
<PAGE>


herein contained. No extension of time for performance of any obligation or act
shall be deemed any extension of the time for performance of any other
obligation or act.

       2.2. Except as otherwise set forth above, all notices or other
communications required or permitted hereunder shall be in writing, and shall be
sent as set forth in the Purchase Agreement.

       2.3. This Escrow Agreement shall be binding upon and shall inure to the
benefit of the permitted successors and permitted assigns of the parties hereto.

       2.4. This Escrow Agreement is the final expression of, and contains the
entire agreement between, the parties with respect to the subject matter hereof
and supersedes all prior understandings with respect thereto. This Escrow
Agreement may not be modified, changed, supplemented or terminated, nor may any
obligations hereunder be waived, except by written instrument signed by the
parties to be charged or by its agent duly authorized in writing or as otherwise
expressly permitted herein.

       2.5. Whenever required by the context of this Escrow Agreement, the
singular shall include the plural and masculine shall include the feminine. This
Escrow Agreement shall not be construed as if it had been prepared by one of the
parties, but rather as if both parties had prepared the same. Unless otherwise
indicated, all references to Articles are to this Escrow Agreement.

       2.6. The parties hereto expressly agree that this Escrow Agreement shall
be governed by, interpreted under and construed and enforced in accordance with
the laws of the State of New York. Any action to enforce, arising out of, or
relating in any way to, any provisions of this Escrow Agreement shall only be
brought in a state or Federal court sitting in New York City.

       2.7. The Escrow Agent's duties hereunder may be altered, amended,
modified or revoked only by a writing signed by the Company, each Investor and
the Escrow Agent.

       2.8. The Escrow Agent shall be obligated only for the performance of such
duties as are specifically set forth herein and may rely and shall be protected
in relying or refraining from acting on any instrument reasonably believed by
the Escrow Agent to be genuine and to have been signed or presented by the
proper party or parties. The Escrow Agent shall not be personally liable for any
act the Escrow Agent may do or omit to do hereunder as the Escrow Agent while
acting in good faith, and without gross negligence or willful misconduct.

       2.9. The Escrow Agent is hereby expressly authorized to disregard any and
all warnings given by any of the parties hereto or by any other person or
corporation, excepting only orders or process of courts of law and is hereby
expressly authorized to comply with and obey orders, judgments or decrees of any
court. In case the Escrow Agent obeys or complies with any such order, judgment
or decree, the Escrow Agent shall not be liable to any of the parties hereto or
to any other person, firm or corporation by reason of such decree being
subsequently reversed, modified, annulled, set aside, vacated or found to have
been entered without jurisdiction.

       2.10. The Escrow Agent shall not be liable in any respect on account of
the identity, authorization or rights of the parties executing or delivering or
purporting to execute or deliver the Purchase Agreement or any documents or
papers deposited or called for thereunder.

       2.11. The Escrow Agent shall be entitled to employ such legal counsel and
other experts as the Escrow Agent may deem necessary properly to advise the
Escrow Agent in connection with the Escrow Agent's duties hereunder, may rely
upon the advice of such counsel, and may pay such counsel reasonable
compensation therefor. THE ESCROW AGENT HAS ACTED AS LEGAL COUNSEL FOR THE


                                  EX 10.1D - 3
<PAGE>


INVESTORS, AND MAY CONTINUE TO ACT AS LEGAL COUNSEL FOR THE INVESTORS, FROM TIME
TO TIME, NOTWITHSTANDING ITS DUTIES AS THE ESCROW AGENT HEREUNDER. THE COMPANY
CONSENTS TO THE ESCROW AGENT IN SUCH CAPACITY AS LEGAL COUNSEL FOR THE INVESTORS
AND WAIVES ANY CLAIM THAT SUCH REPRESENTATION REPRESENTS A CONFLICT OF INTEREST
ON THE PART OF THE ESCROW AGENT. THE COMPANY UNDERSTANDS THAT THE INVESTORS AND
THE ESCROW AGENT ARE RELYING EXPLICITLY ON THE FOREGOING PROVISION IN ENTERING
INTO THIS ESCROW AGREEMENT.

       2.12. The Escrow Agent's responsibilities as escrow agent hereunder shall
terminate if the Escrow Agent shall resign by written notice to the Company and
the Investors. In the event of any such resignation, the Investors and the
Company shall appoint a successor Escrow Agent.

       2.13. If the Escrow Agent reasonably requires other or further
instruments in connection with this Escrow Agreement or obligations in respect
hereto, the necessary parties hereto shall join in furnishing such instruments.

       2.14. It is understood and agreed that should any dispute arise with
respect to the delivery and/or ownership or right of possession of the documents
or the escrow funds held by the Escrow Agent hereunder, the Escrow Agent is
authorized and directed in the Escrow Agent's sole discretion (1) to retain in
the Escrow Agent's possession without liability to anyone all or any part of
said documents or the escrow funds until such disputes shall have been settled
either by mutual written agreement of the parties concerned by a final order,
decree or judgment or a court of competent jurisdiction after the time for
appeal has expired and no appeal has been perfected, but the Escrow Agent shall
be under no duty whatsoever to institute or defend any such proceedings or (2)
to deliver the escrow funds and any other property and documents held by the
Escrow Agent hereunder to a state or Federal court having competent subject
matter jurisdiction and located in the City of New York in accordance with the
applicable procedure therefor.


                                  EX 10.1D - 4
<PAGE>


       2.15. The Company and each Investor agree jointly and severally to
indemnify and hold harmless the Escrow Agent and its partners, employees, agents
and representatives from any and all claims, liabilities, costs or expenses in
any way arising from or relating to the duties or performance of the Escrow
Agent hereunder or the transactions contemplated hereby or by the Purchase
Agreement other than any such claim, liability, cost or expense to the extent
the same shall have been determined by final, unappealable judgment of a court
of competent jurisdiction to have resulted from the gross negligence or willful
misconduct of the Escrow Agent.

       IN WITNESS WHEREOF, the parties hereto have executed this Escrow
Agreement as of the date set forth above.


                                       DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                       AMRO International, S.A.


                                        By:
                                             -----------------------------------
                                             H.U. Bachofen, Director


                                       The Endeavour Capital Fund, S.A.


                                        By:
                                             -----------------------------------
                                             Shmuli Margulies, Authorized
                                             Signatory


                                       Esquire Trade & Finance, Inc.


                                        By:
                                             -----------------------------------
                                             Roland Winiger, Authorized
                                             Signatory


                                       Austinvest Anstalt Balzers


                                        By:
                                             -----------------------------------
                                             Dr. Walter Grill, Authorized
                                             Signatory


                                       ESCROW AGENT:

                                       EPSTEIN BECKER & GREEN, P.C.


                                        By:
                                             -----------------------------------


                                  EX 10.1D - 5
<PAGE>


                                                                    EXHIBIT X TO
                                                                ESCROW AGREEMENT

                                 RELEASE NOTICE

       The UNDERSIGNED, pursuant to the Escrow Agreement, dated as of October
25, 1999 among Dental/Medical Diagnostic Systems, Inc., the Investors signatory
thereto and Epstein Becker & Green, P.C., as Escrow Agent (the "Escrow
Agreement"; capitalized terms used herein and not defined shall have the meaning
ascribed to such terms in the Escrow Agreement), hereby notify the Escrow Agent
that each of the conditions precedent to the purchase and sale of the
Exchangeable Preferred Stock and Warrants set forth in the Exchangeable
Preferred Stock and Warrants Purchase Agreement have been satisfied. The Company
and the undersigned Investor hereby confirm that all of their respective
representations and warranties contained in the Purchase Agreement remain true
and correct and authorize the release by the Escrow Agent of the funds and
documents to be released at the Closing as described in the Escrow Agreement.
This Release Notice shall not be effective until executed by the Company and the
Investor.

       This Release Notice may be signed in one or more counterparts, each of
which shall be deemed an original.

       IN WITNESS WHEREOF, the undersigned have caused this Release Notice to be
duly executed and delivered as of this __ day of November, 1999.

                                       Dental/Medical Diagnostic Systems, Inc.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                       INVESTOR:


                                        By:
                                             -----------------------------------
                                             Name:
                                             Title:


                                  EX 10.1D - 6
<PAGE>


                                                                       EXHIBIT E

          FORM OF OPINION OF TROOP STEUBER PASICH REDDICK & TOBEY, LLP



To the Several Purchasers of Series A
Exchangeable Preferred Stock of
Dental/Medical Diagnostic Systems, Inc
signatory to the Purchase Agreement (as
defined below)

       RE: DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

Ladies and Gentlemen:

       We have acted as counsel to Dental/Medical Diagnostic Systems, Inc., a
Delaware corporation (the "Company"), in connection with that certain
Exchangeable Preferred Stock and Warrants Purchase Agreement (the "Purchase
Agreement"), dated as of October 25, 1999, by and among the Company and the
several investors signatory thereto (the "Investors"), pursuant to which the
Company has agreed to issue and sell to the Investors an aggregate of (i) up to
$2,000,000 Stated Value of Exchangeable Preferred Stock (the "Preferred
Shares"), (ii) 2,500 shares of Common Stock of the Company (the "Common Shares")
and (iii) warrants to purchase up to an aggregate of 40,000 shares of Common
Stock of the Company (the "Warrants" and, together with the Preferred Shares and
the Common Shares, the "Securities"). All capitalized terms not otherwise
defined herein shall have the same meanings attributed to them in the Purchase
Agreement.

       We are rendering the opinions set forth in this letter (the "Opinion") at
the request of our client pursuant to Section 2.1(b)(viii) of the Purchase
Agreement.

       For purposes of rendering the opinions set forth herein, we have reviewed
originals or copies of the following documents:

              (i)    The Certificate of Incorporation and the Bylaws of the
                     Company, each as amended through the date hereof;

              (ii)   The Certificate of Designations of Preferences and Rights
                     of Series A Exchangeable Preferred Stock of the Company, as
                     filed with the Secretary of State of the State of Delaware
                     on November ___, 1999 (the "Series A Certificate");

              (iii)  The minutes of all of the meetings of the shareholders of
                     the Company (the "Shareholders") and the Board of Directors
                     of the Company (the "Board") certified by the Secretary of
                     the Company as constituting all minutes of meetings and
                     written consents of the Company's Shareholders and Board
                     relating to the transactions contemplated by the Purchase
                     Agreement;


<PAGE>


              (iv)   The Purchase Agreement;

              (v)    The Registration Rights Agreement, dated as of October 25,
                     1999, by and among the Company and the Investors (the
                     "Registration Rights Agreement");

              (vi)   The Escrow Agreement, dated as of October 25, 1999, by and
                     among the Company, the Investors, and Epstein Becker &
                     Green, P.C., as escrow agent (the "Escrow Agreement");

              (vii)  The agreements, indentures, mortgages, leases, notes or
                     other obligations or instruments, (the "Material
                     Contracts"), attached as an exhibit to the Company's Annual
                     Report on Form 10-K, for the year ended December 31, 1998,
                     as amended (the "Annual Report") or attached as an exhibit
                     to any other reports of the Company filed with the
                     Securities and Exchange Commission on Form 10-Q or Form 8-K
                     after the date of the Annual Report (together with the
                     Annual Report, the "SEC Documents"); and

              (viii) Such other documents as we have deemed necessary or
                     appropriate in order to render this Opinion.

       The Purchase Agreement, the Warrants, the Registration Rights Agreement
and the Escrow Agreement are sometimes collectively referred to herein as the
"Transaction Agreements."

       In our examination, we have assumed, without investigation or inquiry,
the authenticity of all documents submitted to us as originals, the genuineness
of all signatures, the legal capacity of natural persons, the conformity to the
originals of all documents submitted to us as copies and the authenticity of the
originals of such latter documents. In addition, we have, without investigation
or inquiry, assumed that all of the parties to such documents have all requisite
power and authority to execute, deliver and perform their respective obligations
under each of the documents to which they are party (other than the Company with
respect to the Transaction Agreements) and that each of the documents has been
duly authorized by all necessary action on the part of such parties (other than
the Company with respect to the Transaction Agreements) as are party thereto,
and are valid, binding and enforceable obligations of all parties thereto (other
than the Company with respect to the Transaction Agreements).

       As to the truth and accuracy of all factual matters which are material to
this Opinion, we have relied solely upon certificates or other comparable
documents of officers, directors or other representatives of the Company (the
"Company Certificates"), certificates of governmental agencies and upon the
representations and warranties of each of the parties contained in the
Transaction Agreements and upon the relevant facts stated therein, all of which
we have assumed to be true and complete in the absence of actual knowledge to
the contrary.


                                  EX 10.1E - 2
<PAGE>


      Whenever the phrase "to our knowledge," "known to us" or similar language
appears in this Opinion, the phrase means that (a) we have relied exclusively on
our review of the documents described in paragraphs (i) through (viii) above and
the Company Certificates, (b) we have made no examination or investigation of
public records (including, without limitation, any plaintiff or defendant
indices of any state or federal courts), whether or not such examination or
investigation might otherwise be reasonable or prudent, and (c) no attorney who
has participated in representing the Company during the last twelve months and
who is currently employed by or is a member of our firm, has any conscious
awareness of facts or other information which indicates that any of the opinions
which are made to our knowledge contained herein are untrue. Unless otherwise
expressly stated herein, we have not undertaken any independent investigation to
determine the existence or non-existence of any factual matters. Whenever the
phrase "to our knowledge," "known to us" or similar language appears at the
beginning of a sentence in this Opinion, it shall be construed to modify every
word, phrase and clause contained in that sentence.

      Based on the foregoing, and subject to the assumptions, exceptions and
qualifications set forth herein, we are of the opinion that as of the date
hereof:

       1. The Company is a corporation duly organized, validly existing and in
good standing under the laws of the State of Delaware and has the requisite
corporate power and corporate authority to operate its business and to own,
lease and operate its properties and assets as described in the Company's SEC
Documents. To our knowledge, the Company does not have any subsidiaries and does
not own more than 50% of the outstanding capital stock of or control any other
business entity other than as disclosed in the SEC Documents.

       2. The Company has the requisite corporate power and corporate authority
to enter into and perform its obligations under the Transaction Agreements and
to issue the Securities. Subject to any requirement of the Nasdaq Stock Market,
Inc. or the Boston Stock Market (each, a "Trading Market"), the Company has the
requisite corporate power and corporate authority to issue the shares of Common
Stock into which the Preferred Shares shall be exchangeable (the "Exchange
Shares") and the shares of Common Stock issuable upon exercise of the Warrants
(the "Warrant Shares"). The execution and delivery of the Transaction Agreements
by the Company and the consummation by it of the transactions contemplated
thereby have been duly authorized by all necessary corporate action and no
further consent or authorization of the Company or its Board of Directors or
stockholders is required, except that the issuance of Exchange Shares and
Warrant Shares may be limited by the corporate governance rules of any Trading
Market until the receipt of stockholder approval. Each of the Transaction
Agreements has been duly executed and delivered, and certificates evidencing the
Preferred Shares and the Common Shares have each been duly executed and
delivered by the Company and each of the Transaction Agreements constitutes
valid and binding obligations of the Company enforceable against the Company in
accordance with their respective terms.

       3. The execution, delivery and performance of the Transaction Agreements
by the Company and the consummation by the Company of the transactions
contemplated thereby,


                                  EX 10.1E - 3
<PAGE>


including, without limitation, the issuance of the Securities, do not and will
not (i) result in a violation of the Company's Certificate of Incorporation or
By-Laws; (ii) to our knowledge, conflict with, or constitute a material default
(or an event that with notice or lapse of time or both would become a default)
under, or give to others any rights of termination, amendment, acceleration or
cancellation of, any of the Material Contracts; or (iii) result in a violation
of any federal or California state law, rule or regulation applicable to the
Company or by which any property or asset of the Company is bound, except for
such violations as would not, individually or in the aggregate, have a Material
Adverse Effect. To our knowledge, the Company is not in violation of any terms
of its Certificate of Incorporation or Bylaws.

       4. The issuance of the Securities is exempt from the registration and
prospectus delivery requirements of the Securities Act of 1933, as amended, and
from the registration and qualification requirements of the California Corporate
Securities Law of 1968, as amended. When issued in accordance with the
Agreement, the Common Shares, Exchange Shares and the Warrant Shares will be
duly and validly issued, fully paid and nonassessable, and free of any liens,
encumbrances and preemptive or similar rights contained in the Company's
Certificate of Incorporation or Bylaws or, to our knowledge, any Material
Contract.

       5. To our knowledge, the Company is not a party to or subject to the
provisions of any order, writ, injunction, judgment or decree of any court or
government agency or instrumentality.

       6. Assuming receipt of stockholder approval as may be required by the
corporate governance rules of any Trading Market, the issuance of the Preferred
Shares, the Exchange Shares, the Warrants and the Warrant Shares will not
violate the applicable listing agreement between the Company and Trading Market.

       7. The authorized capital stock of the Company consists of 20,000,000
shares of Common Stock, $0.01 par value per share, and 1,000,000 shares of
Preferred Stock, $0.01 par value per share, of which 2,000 shares have been
designated Series A Exchangeable Preferred Stock and no other shares of which
have been designated as to series or class.

       Our opinion set forth in paragraph (1) above regarding the good standing
of the Company is based solely upon a certificate of good standing issued by the
offices of the Secretary of State of the State of Delaware, dated November ___,
1999, and an oral bringdowns of good standing from such office dated as of
November ___, 1999.

       Our opinions set forth are subject to the following qualifications:

              (a) Enforceability may be subject to or limited by bankruptcy,
       insolvency, reorganization or moratorium or other similar laws relating
       to or affecting creditors' rights generally or the appointment of a
       receiver or a conservator pursuant to state or federal law;


                                  EX 10.1E - 4
<PAGE>


              (b) The availability of equitable remedies, specific performance
       and injunctive relief are subject to the discretion of the court before
       which any proceeding therefore is brought;

              (c) Enforceability may be subject to or limited by the effect of
       general principles of equity, including without limitation, concepts of
       materiality, reasonableness, good faith and fair dealing, regardless of
       whether considered in a proceeding in equity or at law or may be limited
       to the extent that the court before which any proceedings therefore is
       brought concludes that such enforcement would be unreasonable,
       unconscionable or unnecessary under existing circumstances;

              (d) Enforceability may be limited if the parties thereto seek to
       enforce their rights under the Transaction Agreements other than in good
       faith and other than in a commercially reasonable manner;

              (e) Rights to indemnity may be limited by applicable law or the
       public policy underlying such laws;

              (f) Waivers of statutes of limitations, notice, jury trial, due
       process and choice of venue or forum clauses may contravene public policy
       and statutory and case law, and therefore may be unenforceable;

              (g) Contractual provisions waiving broadly or vaguely stated
       rights or unknown future rights, and/or provisions that rights or
       remedies are not exclusive, that every right and remedy is cumulative and
       may be exercised in addition to or together with any other right or
       remedy or that the election of some particular remedy or remedies does
       not preclude recourse to one or more others, may not be enforceable;

              (h) We express no opinion as to the Company's compliance or
       noncompliance with applicable federal or state anti-fraud or antitrust
       statutes, laws, rules and regulations;

              (i) We express no opinion as to the enforceability under certain
       circumstances of any provisions prohibiting waivers of any terms of the
       Transaction Agreements other than in writing, or prohibiting oral
       modifications thereof or modification by course of dealing;

              (j) Our opinions are subject to the effect of judicial decisions
       that may permit the introduction of extrinsic evidence to interpret the
       terms of written contracts;

              (k) We express no opinion as to the effect of subsequent issuances
       of securities of the Company, to the extent that further issuances may be
       integrated with the issuance of the Securities;

              (l) Except as expressly set forth herein, we express no opinion as
       to the Company's compliance or noncompliance with any state securities or
       "blue sky" laws;

              (m) We express no opinion as to the enforceability of the choice
       of law or arbitration provisions in the Transaction Agreements;


                                  EX 10.1E - 5
<PAGE>


              (n) We express no opinion as to the enforceability of provisions
       calling for liquidated damages or acknowledging the availability of
       equitable relief in the Transaction Agreements;

              (o) We express no opinion as to the enforceability of provisions
       relating to the rights of the Investors in the context of any case
       involving the Company pursuant to 11 U.S.C. ss. 101 ET SEQ (the
       "Bankruptcy Code") or any purported waivers by the Company of rights
       available to it under the Bankruptcy Code; and

              (p) We express no opinion as to the enforceability of any
       agreement of the Company's directors to take any action or agreement of
       the Company to cause the Company's Board of Directors to take any action.

       We note that on April 26, 1999, the Company filed a Registration
Statement on Form SB-2 with the Securities and Exchange Commission (the
"Commission") to register the proposed offer and sale of shares of its common
stock to purchasers in Belgium (the "April Registration Statement"), which was
subsequently declared effective by the Commission. On November 9, 1999, the
Company filed with the Commission a Form RW to withdraw the April Registration
Statement. No sales were made pursuant to the April Registration Statement prior
to the filing of Form RW. As to our opinions set forth in paragraphs (3) and (4)
above, we assume that the offering described in the April Registration Statement
is not integrated with the sale of securities set forth in the Transaction
Agreements.

       As to our opinion set forth in Paragraph 3 above, we do not opine as to,
and we have not reviewed or examined:

              (a) any local, municipal, county, district or regional law,
       statute, order, decree, administrative record, policy, procedure,
       guideline, rule, requirement, regulation or notice; or

              (b) any policy, procedure, guideline, rule, requirement or
       regulation that is privileged, confidential, internal, unpublished, or
       not of public record or not widely disseminated at the date of this
       Opinion.

       We have not been requested to opine, and we have not opined, as to any
matters other than those expressly set forth herein. This Opinion extends only
to questions of the law of the State of California, the General Corporation Law
of the State of Delaware and the federal law of the United States of America,
and we express no opinion with respect to any other laws or the law of any other
jurisdiction. We are attorneys licensed to practice law in the State of
California and we do not purport to be experts as to the law of any jurisdiction
other than the State of California, the General Corporation Law of the State of
Delaware or the federal law of the United States of America; accordingly our
opinions extend only to questions of the law of such jurisdictions. We note that
the Purchase Agreement, the Registration Rights Agreement and the Escrow
Agreement, by their terms,


                                  EX 10.1E - 6
<PAGE>


shall be interpreted in accordance with the laws of the State of New York, and
that the Warrant, by its terms, shall be interpreted in accordance with the laws
of the State of Delaware. We have assumed for purposes of this Opinion, that the
laws of the State of New York and the laws of the State of Delaware (other than
the General Corporation Law of the State of Delaware) are identical to the laws
of the State of California.

       We have intended that, where applicable, our opinions shall be construed
in light of the generally recognized meanings of such opinions as set forth in
the "Report of the Committee on Corporations Regarding Legal Opinions in
Business Transactions" dated August 1989, published by the Business Law Section
of the State Bar of California, and this Opinion is qualified in its entirety
thereby.

       Our review has been limited to laws, rules and regulations currently in
effect which we believe (based upon our experience with similar transactions)
should be applicable to the Company's business or the execution and delivery of
the Transaction Agreements and the transactions contemplated thereby, and we
have not made any special investigations concerning any other law, rule or
regulation. This Opinion is limited to facts and applicable law in existence as
of the date hereof and we do not undertake and expressly disavow any duty or
obligation to advise you of any change in facts or applicable law after the date
hereof, whether or not relating to the specific issues addressed in this
Opinion, and you may not rely upon us in any respect with regard to continuing
advice concerning changes in applicable law or facts after the date of this
Opinion.

       This Opinion has been rendered to you at the request of the Company and
may be relied upon by you only in connection with the Transaction Agreements and
the transactions contemplated thereby. This Opinion is not to be otherwise
relied upon by you for any other purpose or by any other person or entity
without our prior written agreement.


                              Respectfully Submitted,



                              TROOP STEUBER PASICH
                              REDDICK & TOBEY, LLP


                                  EX 10.1E - 7
<PAGE>


                                    EXHIBIT F
                         INSTRUCTIONS TO TRANSFER AGENT
                    DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.



____________________, 1999

American Stock Transfer & Trust Company
40 Wall Street
New York, NY 10005

Dear Sirs:

       Reference is made to the Exchangeable Preferred Stock and Warrants
Purchase Agreement and all Exhibits thereto (the "Agreement") dated as of
October 25, 1999, between the investors signatory thereto (the "Investors") and
Dental/Medical Diagnostic Systems, Inc. (the "Company"). Pursuant to the
Agreement, and subject to the terms and conditions set forth in the Agreement,
the Company has issued to the Investors (i) 2,000 shares of Series A
Exchangeable Preferred Stock (the "Preferred Stock"), (ii) 2,500 shares of
Common Stock and (iii) Warrants to purchase 40,000 shares of Common Stock (the
"Warrants"). As a condition to the effectiveness of the Agreement, the Company
has agreed to issue to you, as the transfer agent for the Common Stock (the
"Transfer Agent"), these instructions relating to the Common Stock issued at the
Closing and to be issued to the Investors (or a permitted assignee) pursuant to
the Agreement upon exchange of the Preferred Stock or upon exercise of the
Warrants. All capitalized terms used herein and not otherwise defined shall have
the meaning set forth in the Agreement.

       1. ISSUANCE OF COMMON STOCK WITHOUT THE LEGEND

       Pursuant to the Agreement and the Registration Rights Agreement, the
Company is required to prepare and file with the SEC, and maintain the
effectiveness of, a registration statement or registration statements
registering the resale of the Common Stock acquired at the Closing and to be
acquired by the Investors (i) upon exercise of the Warrants and (ii) upon
exchange of, or as payment of dividends on, the Preferred Stock, all as provided
in the Registration Rights Agreement. The Company will advise the Transfer Agent
in writing of the effectiveness of any such registration statement promptly upon
its being declared effective, and shall deliver an opinion of its counsel to
that effect. The Transfer Agent shall be entitled to rely on such advice and
such opinion and shall assume that such registration statement remains in effect
unless the Transfer Agent is otherwise advised in writing by the Company or such
counsel, and the Transfer Agent shall not be required to independently confirm
the continued effectiveness of such registration statement. In the circumstances
set forth in the following three paragraphs, the Transfer Agent shall deliver to
the appropriate Investor certificates representing Common Stock not bearing the
Legend without requiring further advice or instruction or additional
documentation from the Company or its counsel or the Investor or its counsel or
any other party (other than as described in such paragraphs).


<PAGE>


              (a) At any time after the effective date of the registration
       statement (provided that the Company has not informed the Transfer Agent
       in writing that such registration statement is not effective) upon any
       surrender of one or more certificates evidencing Common Stock which bear
       the Legend, to the extent accompanied by a notice requesting the issuance
       of new certificates free of the Legend to replace those surrendered, in
       such names and in such denominations as the Investor may request,
       provided that in connection with any such event, the Investor (or its
       permitted assignee) shall confirm in writing to the Transfer Agent that
       (i) the Investor has sold, pledged or otherwise transferred or agreed to
       sell, pledge or otherwise transfer such Common Stock in a bona fide
       transaction to a third party that is not an affiliate of the Company; and
       (ii) the Investor confirms to the transfer agent that the Investor has
       complied with the prospectus delivery requirement.

              (b) In the event a registration statement is not filed by the
       Company, or for any reason the registration statement which is filed by
       the Company is not declared effective by the SEC, the Investor, or its
       permitted assignee, or its broker confirms to the Transfer Agent that (i)
       the Investor has beneficially owned the shares of Common Stock for at
       least one year, (ii) counting the shares surrendered as being sold upon
       the date the unlegended Certificates would be delivered to the Investor
       (or the Trading Day immediately following if such date is not a Trading
       Day), the Investor will not have sold more than the greater of (a) one
       percent (1%) of the total number of outstanding shares of Common Stock or
       (b) the average weekly trading volume of the Common Stock for the
       preceding four weeks during the three months ending upon such delivery
       date (or the Trading Day immediately following if such date is not a
       Trading Day), and (iii) the Investor has complied with the manner of sale
       and notice requirements of Rule 144 under the Securities Act; or

              (c) The Investor (or its permitted assignee) shall represent that
       it is permitted to dispose of such shares of Common Stock without
       limitation as to amount or manner of sale pursuant to Rule 144(k) under
       the Securities Act.

              In the case of subparagraphs (b) or (c), the Transfer Agent shall
       be entitled to require an opinion of counsel to the Company or from
       counsel to the Investor (which opinion shall be from an attorney or law
       firm reasonably acceptable to the Transfer Agent and be in form and
       substance reasonably acceptable to the Transfer Agent). Any advice,
       notice, or instructions to the Transfer Agent required or permitted to be
       given hereunder may be transmitted via facsimile to the Transfer Agent's
       facsimile number of 718-331-1852.

       2. MECHANICS OF DELIVERY OF CERTIFICATES REPRESENTING COMMON STOCK

       In connection with any exchange of the Preferred Stock or exercise of
Warrants pursuant to which the Investor acquires Common Stock under the
Agreement, the Transfer Agent is hereby instructed to deliver to the Investor,
certificates representing Common Stock (with or without the Legend, as
appropriate) within two (2) Trading Days of receipt by the Transfer Agent of a
copy of the Notice of Conversion (in the case of the Preferred Stock) or Notice
of Exercise (in the case of the Warrant) from the Investor, and to deliver such
certificates to the Investor, in the case of original issuance, and in the case
of subsequent transfer, if the Transfer Agent is able to deliver such Common
Stock to the Investor's account pursuant to the


                                  EX 10.1F - 2
<PAGE>


DWAC system of the Depository Trust Company, the Transfer Agent shall make
delivery pursuant to such system and provide the Investor with confirmation
thereof in lieu of such Common Stock certificates.

       3. FEES OF TRANSFER AGENT; INDEMNIFICATION

       The Company agrees to pay the Transfer Agent for all fees incurred in
connection with these Irrevocable Instructions. The Company agrees to indemnify
the Transfer Agent and its officers, employees and agents, against any losses,
claims, damages or liabilities, joint or several, to which it or they become
subject based upon the performance by the Transfer Agent of its duties in
accordance with these instructions, other than as a result of the Transfer
Agent's gross negligence or willful misconduct.

       4. THIRD PARTY BENEFICIARY

       The Company and the Transfer Agent acknowledge and agree that the
Investors are each an express third party beneficiary of these instructions and
shall be entitled to rely upon, and enforce, the provisions thereof.


                                       Dental/Medical Diagnostic Systems, Inc.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                  EX 10.1F - 3





                                                                    EXHIBIT 10.2

NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT")
OR ANY OTHER APPLICABLE SECURITIES LAWS IN RELIANCE UPON AN EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND SUCH OTHER SECURITIES LAWS.
NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF MAY BE SOLD,
PLEDGED, TRANSFERRED, ENCUMBERED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR IN A TRANSACTION
WHICH IS EXEMPT FROM REGISTRATION UNDER THE PROVISIONS OF THE SECURITIES ACT.



                             STOCK PURCHASE WARRANT


                To Purchase [________] Shares of Common Stock of

                     DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC.

       THIS CERTIFIES that, for value received, [_____________________] (the
"Holder"), is entitled, upon the terms and subject to the conditions hereinafter
set forth, at any time on or after March 15, 2000 (the "Initial Exercise Date")
and on or prior to the close of business on March 15, 2005 (the "Termination
Date") but not thereafter, to subscribe for and purchase from Dental/Medical
Diagnostic Systems, Inc., a corporation incorporated in Delaware (the
"Company"), up to [______________________________ (___________)] shares (the
"Warrant Shares") of Common Stock, $.01 par value, of the Company (the "Common
Stock"). The purchase price of one share of Common Stock (the "Exercise Price")
under this Warrant shall be $_________ (130% of the Market Price of the Common
Stock on the Closing Date of the Exchangeable Preferred Stock and Warrants
Purchase Agreement dated as of October 25, 1999 pursuant to which this Warrant
has been issued (the "Purchase Agreement")). The Exercise Price and the number
of shares for which the Warrant is exercisable shall be subject to adjustment as
provided herein. In the event of any conflict between the terms of this Warrant
and the Purchase Agreement, the Purchase Agreement shall control. Capitalized
terms used and not otherwise defined herein shall have the meanings set forth
for such terms in the Purchase Agreement.


<PAGE>


       1. TITLE TO WARRANT. Prior to the Termination Date and subject to
compliance with applicable laws and the terms of this Warrant, this Warrant and
all rights hereunder are transferable, in whole or in part, at the office or
agency of the Company by the holder hereof in person or by duly authorized
attorney, upon surrender of this Warrant together with the Assignment Form
annexed hereto properly endorsed.

       2. AUTHORIZATION OF SHARES. The Company covenants that all shares of
Common Stock which may be issued upon the exercise of rights represented by this
Warrant will, upon exercise of the rights represented by this Warrant, be duly
authorized, validly issued, fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

       3. EXERCISE OF WARRANT. Except as provided in Section 4 herein, exercise
of the purchase rights represented by this Warrant may be made at any time or
times on or after the Initial Exercise Date, and before the close of business on
the Termination Date by the surrender of this Warrant and the Notice of Exercise
Form annexed hereto duly executed, at the office of the Company (or such other
office or agency of the Company as it may designate by notice in writing to the
registered holder hereof at the address of such holder appearing on the books of
the Company) and upon payment of the Exercise Price of the shares thereby
purchased by wire transfer or cashier's check drawn on a United States bank, the
holder of this Warrant shall be entitled to receive a certificate for the number
of shares of Common Stock so purchased. Certificates for shares purchased
hereunder shall be delivered to the holder hereof within five (5) Trading Days
after the date on which this Warrant shall have been exercised as aforesaid.
This Warrant shall be deemed to have been exercised and such certificate or
certificates shall be deemed to have been issued, and Holder or any other person
so designated to be named therein shall be deemed to have become a holder of
record of such shares for all purposes, as of the date the Holder faxes a Notice
of Exercise to the Company, provided that such fax notice is followed by
delivery of the original notice and payment to the Company of the Exercise Price
and all taxes required to be paid by Holder, if any, pursuant to Section 5 prior
to the issuance of such shares, have been paid within three (3) Trading Days of
such fax notice. If this Warrant shall have been exercised in part, the Company
shall, at the time of delivery of the certificate or certificates representing
Warrant Shares, deliver to Holder a new Warrant evidencing the rights of Holder
to purchase the unpurchased shares of Common Stock called for by this Warrant,
which new Warrant shall in all other respects be identical with this Warrant. If
there is no registration in effect permitting the resale by the Holder of the
Warrant Shares at any time from and after one year from the issuance date of
this Warrant, then the Holder shall have the right to a "cashless exercise" in
which the Holder shall be entitled to receive a certificate for the number of
shares equal to the quotient obtained by dividing [(A-B) (X)] by (A), where:

(A) = the average of the high and low trading prices per share of Common Stock
on the Trading Day preceding the date of such election;

(B) = the Exercise Price of the Warrant; and


                                  EX 10.2 - 2
<PAGE>


(X) = the number of shares issuable upon exercise of the Warrant in accordance
with the terms of this Warrant.

       4. NO FRACTIONAL SHARES OR SCRIP. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant. As to any fraction of a share which Holder would otherwise be entitled
to purchase upon such exercise, the Company shall pay a cash adjustment in
respect of such final fraction in an amount equal to the Exercise Price.

       5. CHARGES, TAXES AND EXPENSES. Issuance of certificates for shares of
Common Stock upon the exercise of this Warrant shall be made without charge to
the holder hereof for any issue or federal or state transfer tax or other
incidental expense in respect of the issuance of such certificate, all of which
taxes and expenses shall be paid by the Company, and such certificates shall be
issued in the name of the holder of this Warrant or in such name or names as may
be directed by the holder of this Warrant; provided, however, that in the event
certificates for shares of Common Stock are to be issued in a name other than
the name of the holder of this Warrant, this Warrant when surrendered for
exercise shall be accompanied by the Assignment Form attached hereto duly
executed by the holder hereof; and the Company may require, as a condition
thereto, the payment of a sum sufficient to reimburse it for any transfer tax
incidental thereto.

       6. CLOSING OF BOOKS. The Company will not close its shareholder books or
records in any manner which prevents the timely exercise of this Warrant.

       7. TRANSFER, DIVISION AND COMBINATION. (a) the Holder (and its
transferees and assigns), by acceptance of this Warrant, covenants and agrees
that it is acquiring the Warrants evidenced hereby, and, upon exercise hereof,
the Warrant Shares, for its own account as an investment and not with a view to
distribution thereof. The Warrant Shares have not been registered under the
Securities Act or any state securities laws and no transfer of any Warrant
Shares shall be permitted unless the Company has received notice of such
transfer, at the address of its principal office set forth in the Purchase
Agreement, in the form of assignment attached hereto, accompanied by an opinion
of counsel reasonably satisfactory to the Company that an exemption from
registration of such Warrants or Warrant Shares under the Securities Act is
available for such transfer, except that no such opinion shall be required after
the registration for resale by the Holder of the Warrant Shares, as contemplated
by the Registration Rights Agreement. Upon any exercise of the Warrants,
certificates representing the Warrant Shares shall bear a restrictive legend
substantially identical to that set forth on the face of this Warrant
certificate. Any purported transfer of any Warrant or Warrant Shares not in
compliance with the provisions of this section shall be null and void.

              (b) This Warrant may be divided or combined with other Warrants
       upon presentation hereof at the aforesaid office of the Company, together
       with a written notice specifying the names and denominations in which new
       Warrants are to be issued, signed by Holder or its agent or attorney.
       Subject to compliance with Section 7(a), as to any transfer which may be
       involved in such division or combination, the Company shall execute and
       deliver a new Warrant or Warrants in exchange for the Warrant or Warrants
       to be divided or combined in accordance with such notice.


                                  EX 10.2 - 3
<PAGE>


              (c) The Company shall prepare, issue and deliver at its own
       expense (other than transfer taxes) the new Warrant or Warrants under
       this Section 7.

              (d) The Company agrees to maintain, at its aforesaid office,
books for the registration and the registration of transfer of the Warrants.

       8. NO RIGHTS AS SHAREHOLDER UNTIL EXERCISE. This Warrant does not entitle
the holder hereof to any voting rights or other rights as a shareholder of the
Company prior to the exercise hereof. Upon the surrender of this Warrant and the
payment of the aggregate Exercise Price, the Warrant Shares so purchased shall
be and be deemed to be issued to such holder as the record owner of such shares
as of the close of business on the later of the date of such surrender or
payment.

       9. LOSS, THEFT, DESTRUCTION OR MUTILATION OF WARRANT. The Company
covenants that upon receipt by the Company of evidence reasonably satisfactory
to it of the loss, theft, destruction or mutilation of this Warrant certificate
or any stock certificate relating to the Warrant Shares, and in case of loss,
theft or destruction, of indemnity or security reasonably satisfactory to it
(which shall not exceed that customarily charged by the Company's transfer
agent), and upon surrender and cancellation of such Warrant or stock
certificate, if mutilated, the Company will make and deliver a new Warrant or
stock certificate of like tenor and dated as of such cancellation, in lieu of
such Warrant or stock certificate.

       10. SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or legal holiday.

       11. ADJUSTMENTS OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES. (a) STOCK
SPLITS, ETC. The number and kind of securities purchasable upon the exercise of
this Warrant and the Exercise Price shall be subject to adjustment from time to
time upon the happening of any of the following. In case the Company shall (i)
pay a dividend in shares of Common Stock or make a distribution in shares of
Common Stock to holders of its outstanding Common Stock, (ii) subdivide its
outstanding shares of Common Stock into a greater number of shares of Common
Stock, (iii) combine its outstanding shares of Common Stock into a smaller
number of shares of Common Stock or (iv) issue any shares of its capital stock
in a reclassification of the Common Stock, then the number of Warrant Shares
purchasable upon exercise of this Warrant immediately prior thereto shall be
adjusted so that the holder of this Warrant shall be entitled to receive the
kind and number of Warrant Shares or other securities of the Company which he
would have been entitled to receive had such Warrant been exercised in advance
thereof. Upon each such adjustment of the kind and number of Warrant Shares or
other securities of the Company which are purchasable hereunder, the holder of
this Warrant shall thereafter be entitled to purchase the number of Warrant
Shares or other securities resulting from such adjustment at an Exercise Price
per Warrant Share or other security obtained by multiplying the Exercise Price
in effect immediately prior to such adjustment by the number of Warrant Shares
purchasable pursuant hereto immediately prior to such adjustment and dividing by
the number of Warrant Shares or other securities of the Company resulting from
such adjustment. An adjustment made pursuant to


                                  EX 10.2 - 4
<PAGE>


this paragraph shall become effective immediately after the effective date of
such event retroactive to the record date, if any, for such event.

              (b) REORGANIZATION, RECLASSIFICATION, MERGER, CONSOLIDATION OR
       DISPOSITION OF ASSETS. In case the Company shall reorganize its capital,
       reclassify its capital stock, consolidate or merge with or into another
       corporation (where the Company is not the surviving corporation or where
       there is a change in or distribution with respect to the Common Stock of
       the Company), or sell, transfer or otherwise dispose of all or
       substantially all its property, assets or business to another corporation
       and, pursuant to the terms of such reorganization, reclassification,
       merger, consolidation or disposition of assets, shares of common stock of
       the successor or acquiring corporation, or any cash, shares of stock or
       other securities or property of any nature whatsoever (including warrants
       or other subscription or purchase rights) in addition to or in lieu of
       common stock of the successor or acquiring corporation ("Other
       Property"), are to be received by or distributed to the holders of Common
       Stock of the Company, then Holder shall have the right thereafter to
       receive, upon exercise of this Warrant, the number of shares of common
       stock of the successor or acquiring corporation or of the Company, if it
       is the surviving corporation, and Other Property receivable upon or as a
       result of such reorganization, reclassification, merger, consolidation or
       disposition of assets by a holder of the number of shares of Common Stock
       for which this Warrant is exercisable immediately prior to such event. In
       case of any such reorganization, reclassification, merger, consolidation
       or disposition of assets, the successor or acquiring corporation (if
       other than the Company) shall expressly assume the due and punctual
       observance and performance of each and every covenant and condition of
       this Warrant to be performed and observed by the Company and all the
       obligations and liabilities hereunder, subject to such modifications as
       may be deemed appropriate (as determined in good faith by resolution of
       the Board of Directors of the Company) in order to provide for
       adjustments of shares of Common Stock for which this Warrant is
       exercisable which shall be as nearly equivalent as practicable to the
       adjustments provided for in this Section 11. For purposes of this Section
       11, "common stock of the successor or acquiring corporation" shall
       include stock of such corporation of any class which is not preferred as
       to dividends or assets over any other class of stock of such corporation
       and which is not subject to redemption and shall also include any
       evidences of indebtedness, shares of stock or other securities which are
       convertible into or exchangeable for any such stock, either immediately
       or upon the arrival of a specified date or the happening of a specified
       event and any warrants or other rights to subscribe for or purchase any
       such stock. The foregoing provisions of this Section 11 shall similarly
       apply to successive reorganizations, reclassifications, mergers,
       consolidations or disposition of assets.

       12. VOLUNTARY ADJUSTMENT BY THE COMPANY. The Company may at any time
during the term of this Warrant, reduce the then current Exercise Price to any
amount and for any period of time deemed appropriate by the Board of Directors
of the Company.

       13. NOTICE OF ADJUSTMENT. Whenever the number of Warrant Shares or number
or kind of securities or other property purchasable upon the exercise of this
Warrant or the Exercise Price is adjusted, as herein provided, the Company shall
promptly mail by registered or certified mail, return receipt requested, to the
holder of this Warrant notice of such adjustment or adjustments setting forth
the number of Warrant Shares (and other securities or property) purchasable upon
the exercise of this Warrant and the Exercise Price of such Warrant Shares (and
other securities or property) after such adjustment, setting forth a brief
statement of the facts


                                  EX 10.2 - 5
<PAGE>


requiring such adjustment and setting forth the computation by which such
adjustment was made. Such notice, in the absence of manifest error, shall be
conclusive evidence of the correctness of such adjustment.

       14. NOTICE OF CORPORATE ACTION. If at any time:

              (a) the Company shall take a record of the holders of its Common
       Stock for the purpose of entitling them to receive a dividend or other
       distribution, or any right to subscribe for or purchase any evidences of
       its indebtedness, any shares of stock of any class or any other
       securities or property, or to receive any other right, or

              (b) there shall be any capital reorganization of the Company, any
       reclassification or recapitalization of the capital stock of the Company
       or any consolidation or merger of the Company with, or any sale, transfer
       or other disposition of all or substantially all the property, assets or
       business of the Company to, another corporation or,

              (c) there shall be a voluntary or involuntary dissolution,
       liquidation or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at
least 10 days' prior written notice of the record date for such dividend,
distribution or right or for determining rights to vote in respect of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, liquidation or winding up, and (ii) in the case of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, dissolution, liquidation or winding up, at least 10 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause also shall specify (i) the date on which
any such record is to be taken for the purpose of such dividend, distribution or
right, the date on which the holders of Common Stock shall be entitled to any
such dividend, distribution or right, and the amount and character thereof, and
(ii) the date on which any such reorganization, reclassification, merger,
consolidation, sale, transfer, disposition, dissolution, liquidation or winding
up is to take place and the time, if any such time is to be fixed, as of which
the holders of Common Stock shall be entitled to exchange their shares of Common
Stock for securities or other property deliverable upon such disposition,
dissolution, liquidation or winding up. Each such written notice shall be
sufficiently given if addressed to Holder at the last address of Holder
appearing on the books of the Company and delivered in accordance with Section
16(d).


                                  EX 10.2 - 6
<PAGE>


       15. AUTHORIZED SHARES. The Company covenants that during the period the
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any purchase rights under this Warrant. The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Warrant
Shares upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the Principal Market
upon which the Common Stock may be listed.

       The Company shall not by any action, including, without limitation,
amending its certificate of incorporation or through any reorganization,
transfer of assets, consolidation, merger, dissolution, issue or sale of
securities or any other voluntary action, avoid or seek to avoid the observance
or performance of any of the terms of this Warrant, but will at all times in
good faith assist in the carrying out of all such terms and in the taking of all
such actions as may be necessary or appropriate to protect the rights of Holder
against impairment. Without limiting the generality of the foregoing, the
Company will (a) not increase the par value of any shares of Common Stock
receivable upon the exercise of this Warrant above the amount payable therefor
upon such exercise immediately prior to such increase in par value, (b) take all
such action as may be necessary or appropriate in order that the Company may
validly and legally issue fully paid and nonassessable shares of Common Stock
upon the exercise of this Warrant, and (c) use its best efforts to obtain all
such authorizations, exemptions or consents from any public regulatory body
having jurisdiction thereof as may be necessary to enable the Company to perform
its obligations under this Warrant.

       Before taking any action which would cause an adjustment reducing the
current Exercise Price below the then par value, if any, of the shares of Common
Stock issuable upon exercise of the Warrants, the Company shall take any
corporate action which may be necessary in order that the Company may validly
and legally issue fully paid and non-assessable shares of such Common Stock at
such adjusted Exercise Price.

       Before taking any action which would result in an adjustment in the
number of shares of Common Stock for which this Warrant is exercisable or in the
Exercise Price, the Company shall obtain all such authorizations or exemptions
thereof, or consents thereto, as may be necessary from any public regulatory
body or bodies having jurisdiction thereof.

       16. MISCELLANEOUS.

              (a) JURISDICTION. This Warrant shall be binding upon any
       successors or assigns of the Company. This Warrant shall constitute a
       contract under the laws of Delaware without regard to its conflict of
       law, principles or rules, and be subject to arbitration pursuant to the
       terms set forth in the Purchase Agreement.


                                  EX 10.2 - 7
<PAGE>


              (b) RESTRICTIONS. The holder hereof acknowledges that the Warrant
       Shares acquired upon the exercise of this Warrant, if not registered,
       will have restrictions upon resale imposed by state and federal
       securities laws.

              (c) NONWAIVER AND EXPENSES. No course of dealing or any delay or
       failure to exercise any right hereunder on the part of Holder shall
       operate as a waiver of such right or otherwise prejudice Holder's rights,
       powers or remedies, notwithstanding all rights hereunder terminate on the
       Termination Date. If the Company fails to comply with any provision of
       this Warrant, the Company shall pay to Holder such amounts as shall be
       sufficient to cover any costs and expenses including, but not limited to,
       reasonable attorneys' fees, including those of appellate proceedings,
       incurred by Holder in collecting any amounts due pursuant hereto or in
       otherwise enforcing any of its rights, powers or remedies hereunder.

              (d) NOTICES. Any notice, request or other document required or
       permitted to be given or delivered to the holder hereof by the Company
       shall be delivered in accordance with the notice provisions of the
       Purchase Agreement.

              (e) LIMITATION OF LIABILITY. No provision hereof, in the absence
       of affirmative action by Holder to purchase shares of Common Stock, and
       no enumeration herein of the rights or privileges of Holder hereof, shall
       give rise to any liability of Holder for the purchase price of any Common
       Stock or as a stockholder of the Company, whether such liability is
       asserted by the Company or by creditors of the Company.

              (f) REMEDIES. Holder, in addition to being entitled to exercise
       all rights granted by law, including recovery of damages, will be
       entitled to specific performance of its rights under this Warrant. The
       Company agrees that monetary damages would not be adequate compensation
       for any loss incurred by reason of a breach by it of the provisions of
       this Warrant and hereby agrees to waive the defense in any action for
       specific performance that a remedy at law would be adequate.

              (g) SUCCESSORS AND ASSIGNS. Subject to applicable securities laws,
       this Warrant and the rights and obligations evidenced hereby shall inure
       to the benefit of and be binding upon the successors of the Company and
       the successors and permitted assigns of Holder. The provisions of this
       Warrant are intended to be for the benefit of all Holders from time to
       time of this Warrant and shall be enforceable by any such Holder or
       holder of Warrant Shares.

              (h) INDEMNIFICATION. The Company agrees to indemnify and hold
       harmless Holder from and against any liabilities, obligations, losses,
       damages, penalties, actions, judgments, suits, claims, costs, attorneys'
       fees, expenses and disbursements of any kind which may be imposed upon,
       incurred by or asserted against Holder in any manner relating to or
       arising out of any failure by the Company to perform or observe in any
       material respect any of its covenants, agreements, undertakings or
       obligations set forth in this Warrant; PROVIDED, HOWEVER, that the
       Company will not be liable hereunder to the extent that any liabilities,
       obligations, losses, damages, penalties, actions, judgments, suits,
       claims, costs, attorneys' fees, expenses or disbursements are found in a
       final non-appealable judgment by a court to have resulted from Holder's
       negligence, bad faith or willful misconduct.


                                  EX 10.2 - 8
<PAGE>


              (i) AMENDMENT. This Warrant may be modified or amended or the
       provisions hereof waived with the written consent of the Company and the
       Holder.

              (j) SEVERABILITY. Wherever possible, each provision of this
       Warrant shall be interpreted in such manner as to be effective and valid
       under applicable law, but if any provision of this Warrant shall be
       prohibited by or invalid under applicable law, such provision shall be
       ineffective to the extent of such prohibition or invalidity, without
       invalidating the remainder of such provisions or the remaining provisions
       of this Warrant.


                                  EX 10.2 - 9
<PAGE>


              (k) HEADINGS. The headings used in this Warrant are for the
       convenience of reference only and shall not, for any purpose, be deemed a
       part of this Warrant.

       IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officer thereunto duly authorized.


Dated: November ___, 1999

                                       Dental/Medical Diagnostic Systems, Inc.


                                        By:
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                  EX 10.2 - 10
<PAGE>


                               NOTICE OF EXERCISE



To:   Dental/Medical Diagnostic Systems, Inc.



       (1)___The undersigned hereby elects to purchase ________ shares of Common
Stock (the "Common Stock"), of Dental/Medical Diagnostic Systems, Inc. pursuant
to the terms of the attached Warrant, and tenders herewith payment of the
exercise price in full, together with all applicable transfer taxes, if any.

       (2)___Please issue a certificate or certificates representing said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:


          -----------------------------------
          (Name)

          -----------------------------------
          (Address)

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


Dated:


                                             -----------------------------------
                                             Signature


<PAGE>


                                 ASSIGNMENT FORM

                    (To assign the foregoing warrant, execute
                   this form and supply required information.
                 Do not use this form to exercise the warrant.)

       FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced
thereby are hereby assigned to

                                     whose address is
- -----------------------------------

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

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

                                              Dated:
                                                      --------------------, ----


          Holder's Signature:
                              -----------------------------------
          Holder's Address:
                              -----------------------------------

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


Signature Guaranteed:
                      -----------------------------------


NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank or trust company. Officers
of corporations and those acting in an fiduciary or other representative
capacity should file proper evidence of authority to assign the foregoing
Warrant.





                                                                    EXHIBIT 10.3

                          REGISTRATION RIGHTS AGREEMENT

       THIS REGISTRATION RIGHTS AGREEMENT, dated as of October 25, 1999, between
the investor or investors signatory hereto (each an "Investor" and together the
"Investors"), and Dental/Medical Diagnostic Systems, Inc. a Delaware corporation
(the "Company").

       WHEREAS, simultaneously with the execution and delivery of this
Agreement, the Investors are purchasing from the Company, pursuant to an
Exchangeable Preferred Stock and Warrants Purchase Agreement dated the date
hereof (the "Purchase Agreement"), $2,000,000 Stated Value of Exchangeable
Preferred Stock and Warrants to purchase up to 40,000 shares of the Company's
Common Stock and 2,500 shares of Common Stock (terms not defined herein shall
have the meanings ascribed to them in the Purchase Agreement); and

       WHEREAS, the Company desires to grant to the Investors the registration
rights set forth herein with respect to the shares of Common Stock issued at
Closing, the Exchange Shares of Common Stock issuable upon exchange of or as
dividends upon the Exchangeable Preferred Stock purchased pursuant to the
Purchase Agreement and shares of Common Stock issuable upon exercise of the
Warrants (hereinafter referred to as the "Stock" or "Securities" of the
Company).

       NOW, THEREFORE, the parties hereto mutually agree as follows:

       Section 1. REGISTRABLE SECURITIES. As used herein the term "Registrable
Security" means the Securities until (i) the Registration Statement has been
declared effective by the Commission, and all Securities have been disposed of
pursuant to the Registration Statement, (ii) all Securities have been sold under
circumstances under which all of the applicable conditions of Rule 144 (or any
similar provision then in force) under the Securities Act ("Rule 144") are met,
(iii) all Securities have been otherwise transferred to holders who may trade
such Securities without restriction under the Securities Act, and the Company
has delivered a new certificate or other evidence of ownership for such
Securities not bearing a restrictive legend or (iv) such time as, in the opinion
of counsel to the Company, all Securities may be sold without any time, volume
or manner limitations pursuant to Rule 144(k) (or any similar provision then in
effect) under the Securities Act. The term "Registrable Securities" means any
and/or all of the securities falling within the foregoing definition of a
"Registrable Security." In the event of any merger, reorganization,
consolidation, recapitalization or other change in corporate structure affecting
the Common Stock, such adjustment shall be deemed to be made in the definition
of "Registrable Security" as is appropriate in order to prevent any dilution or
enlargement of the rights granted pursuant to this Agreement.

       Section 2. RESTRICTIONS ON TRANSFER. Each Investor acknowledges and
understands that prior to the registration of the Securities as provided herein,
the Securities are "restricted securities" as defined in Rule 144 promulgated
under the Act. Each Investor understands that no disposition or transfer of the
Securities may be made by Investor in the absence of (i) an opinion of counsel
to the Investor, in form and substance reasonably satisfactory to the Company,
that such transfer may be made without registration under the Securities Act or
(ii) such registration.

       With a view to making available to the Investors the benefits of Rule 144
under the Securities Act or any other similar rule or regulation of the
Commission that may at any time permit the Investors to sell securities of the
Company to the public without registration ("Rule 144"), the Company agrees to:

              (a) comply with the provisions of paragraph (c)(1) of Rule 144;
       and


<PAGE>


              (b) file with the Commission in a timely manner all reports and
       other documents required to be filed with the Commission pursuant to
       Section 13 or 15(d) under the Exchange Act by companies subject to either
       of such sections, irrespective of whether the Company is then subject to
       such reporting requirements.

       Section 3. REGISTRATION RIGHTS WITH RESPECT TO THE SECURITIES.

              (a) The Company agrees that it will prepare and file with the
       Securities and Exchange Commission ("Commission"), within sixty (60) days
       after the Closing Date a registration statement (on Form S-3, or other
       appropriate registration statement form) under the Securities Act (the
       "Registration Statement"), at the sole expense of the Company (except as
       provided in Section 3(c) hereof), in respect of the Investors, so as to
       permit a public offering and resale of the Securities under the Act by
       the Investors as selling stockholders and not as underwriters.

              The Company shall use its best efforts to cause such Registration
       Statement to become effective within ninety (90) days from the Closing
       Date (or 120 days from the Closing Date if the SEC makes a "full review"
       of the Registration Statement), or, if earlier, within five (5) days of
       SEC clearance to request acceleration of effectiveness. The number of
       shares designated in the Registration Statement to be registered shall
       include all the Common Stock, the Warrant Shares, at least 175% of the
       number of shares issuable upon exchange of the Exchangeable Preferred
       Stock assuming exchange in full on the day prior to filing date of the
       Registration Statement, and such number of shares as the Company deems
       prudent for the purpose of issuing shares of Common Stock as dividends on
       the Exchangeable Preferred Stock, and shall include appropriate language
       regarding reliance upon Rule 416 to the extent permitted by the
       Commission. The Company will notify the Investors of the effectiveness of
       the Registration Statement within one Trading Day of such event. In the
       event that the number of shares so registered shall be less than 125% of
       the number of shares of Registrable Securities remaining unsold (using
       the Exchange Price of the Exchangeable Preferred Stock from time to
       time), then the Company shall be obligated to file, within thirty (30)
       days of such event, a further Registration Statement registering such
       remaining shares and shall use its best efforts to cause such additional
       Registration Statement to become effective within ninety (90) days of the
       date of such event.

              (b) The Company will maintain the Registration Statement or
       post-effective amendment filed under this Section 3 effective under the
       Securities Act until the earlier of (i) the date that none of the
       Securities covered by such Registration Statement are or may become
       issued and outstanding, (ii) the date that all of the Securities have
       been sold pursuant to such Registration Statement, (iii) the date the
       Investors receive an opinion of counsel to the Company, which counsel
       shall be reasonably acceptable to the Investors, that the Securities may
       be sold under the provisions of Rule 144 without limitation as to volume,
       (iv) all Securities have been otherwise transferred to persons who may
       trade such shares without restriction under the Securities Act, and the
       Company has delivered a new certificate or other evidence of ownership
       for such securities not bearing a restrictive legend, or (v) all
       Securities may be sold without any time, volume or manner limitations
       pursuant to Rule 144(k) or any similar provision then in effect under the
       Securities Act in the opinion of counsel to the Company, which counsel
       shall be reasonably acceptable to the Investor (the "Effectiveness
       Period").

              (c) All fees, disbursements and out-of-pocket expenses and costs
       incurred by the Company in connection with the preparation and filing of
       the Registration Statement under subparagraph 3(a) and in complying with
       applicable securities and Blue Sky laws (including, without limitation,
       all attorneys' fees of the Company) shall be borne by the Company. The
       Investors shall bear the cost of underwriting and/or brokerage discounts,
       fees and commissions, if any, applicable to the Securities being
       registered and the fees and expenses of their counsel. The Investors and
       their counsel shall have a reasonable


                                  EX 10.3 - 2
<PAGE>


       period, not to exceed five (5) Trading Days, to review the proposed
       Registration Statement or any amendment thereto, prior to filing with the
       Commission, and the Company shall provide each Investor with copies of
       any comment letters received from the Commission with respect thereto
       within two (2) Trading Days of receipt thereof. The Company shall qualify
       any of the Securities for sale in such states as any Investor reasonably
       designates and shall furnish indemnification in the manner provided in
       Section 6 hereof. However, the Company shall not be required to qualify
       in any state which will require an escrow or other restriction relating
       to the Company and/or the sellers, or which will require the Company to
       qualify to do business in such state or require the Company to file
       therein any general consent to service of process. The Company at its
       expense will supply the Investors with copies of the applicable
       Registration Statement and the prospectus included therein and other
       related documents in such quantities as may be reasonably requested by
       the Investors.

              (d) The Company shall not be required by this Section 3 to include
       any Investor's Securities in any Registration Statement which is to be
       filed if, in the opinion of counsel to the Company, the proposed offering
       or other transfer as to which such registration is requested is exempt
       from applicable federal and state securities laws and would result in all
       purchasers or transferees obtaining securities which are not "restricted
       securities", as defined in Rule 144 under the Securities Act.

              (e) In the event that (i) the Registration Statement to be filed
       by the Company pursuant to Section 3(a) above is not filed with the
       Commission within sixty (60) days from the Closing Date, (ii) such
       Registration Statement is not declared effective by the Commission within
       the earlier of ninety (90) days from the Closing Date (or 120 days from
       the Closing Date if the Commission makes a "full review" of the
       Registration Statement) or five (5) days of clearance by the Commission
       to request effectiveness, (iii) such Registration Statement is not
       maintained as effective by the Company for the period set forth in
       Section 3(b) above or (iv) the additional Registration Statement referred
       to in Section 3(a) is not filed within thirty (30) days or declared
       effective within ninety (90) days as set forth therein (each a
       "Registration Default") then the Company will pay Investor (pro rated on
       a daily basis), as liquidated damages for such failure and not as a
       penalty one percent (1%) of the aggregate market value of shares of
       Common Stock purchased from the Company (including the Exchange Shares
       which would be issuable upon Exchange of the Exchangeable Preferred Stock
       on any date of determination, and whether or not the Exchangeable
       Preferred Stock are then exchangeable pursuant to their terms) and held
       by the Investor for each week until such Registration Statement has been
       filed, and in the event of late effectiveness (in case of clause (ii)
       above) or lapsed effectiveness (in the case of clause (iii) above), one
       percent (1%) of the aggregate market value of shares of Common Stock
       purchased from the Company and held by the Investor (including the
       Exchange Shares which would be issuable upon exchange of the Exchangeable
       Preferred Stock on any date of determination, and whether or not the
       Exchangeable Preferred Stock are then exchangeable pursuant to their
       terms) for each week (regardless of whether one or more such Registration
       Defaults are then in existence) until such Registration Statement has
       been declared effective. Such payment of the liquidated damages shall be
       made to the Investors in cash, within five (5) calendar days of demand,
       provided, however, that the payment of such liquidated damages shall not
       relieve the Company from its obligations to register the Securities
       pursuant to this Section. The market value of the Common Stock for this
       purpose shall be the closing price (or last trade, if so reported) on the
       Principal Market for each day during such Registration Default.
       Notwithstanding anything to the contrary contained herein, a failure to
       obtain or maintain the effectiveness of a filed Registration Statement or
       the ability of an Investor to use an otherwise effective Registration
       Statement to effect resales of Securities during the period after 45 days
       and within 90 days from the end of the Company's fiscal year resulting
       solely from the need to update the Company's financial statements
       contained or incorporated by reference in such Registration Statement
       shall not constitute a Registration Default and shall not trigger the
       accrual of liquidated damages hereunder.

              If the Company does not remit the payment to the Investors as set
       forth above, the Company will pay the Investors reasonable costs of
       collection, including attorneys' fees, in addition to the


                                  EX 10.3 - 3
<PAGE>


       liquidated damages. The registration of the Securities pursuant to this
       provision shall not affect or limit the Investors' other rights or
       remedies as set forth in this Agreement.

              (f) No provision contained herein shall preclude the Company from
       selling securities pursuant to any Registration Statement in which it is
       required to include Securities pursuant to this Section 3.

              (g) If at any time or from time to time after the effective date
       of any Registration Statement, the Company notifies the Investors in
       writing of the existence of a Potential Material Event (as defined in
       Section 3(h) below), the Investors shall not offer or sell any Securities
       or engage in any other transaction involving or relating to Securities,
       from the time of the giving of notice with respect to a Potential
       Material Event until the Investors receive written notice from the
       Company that such Potential Material Event either has been disclosed to
       the public or no longer constitutes a Potential Material Event; provided,
       however, that the Company may not so suspend the right to such holders of
       Securities for more than thirty (30) days in the aggregate (90 days in
       the case of an acquisition requiring the filing of audited financial
       statements of the acquired business under Form 8-K) during any twelve
       month period, during the period the Registration Statement is required to
       be in effect, and if such period is exceeded, such event shall be a
       Registration Default. If a Potential Material Event shall occur prior to
       the date a Registration Statement is required to be filed, then the
       Company's obligation to file such Registration Statement shall be delayed
       without penalty for not more than twenty (20) days, and such delay or
       delays shall not constitute a Registration Default. The Company must, if
       lawful, give the Investors notice in writing at least two (2) Trading
       Days prior to the first day of the blackout period.

              (h) "Potential Material Event" means any of the following: (a) the
       possession by the Company of material information not ripe for disclosure
       in a registration statement, as determined in good faith by the Chief
       Executive Officer or the Board of Directors of the Company that
       disclosure of such information in a Registration Statement would be
       detrimental to the business and affairs of the Company; or (b) any
       material engagement or activity by the Company which would, in the good
       faith determination of the Chief Executive Officer or the Board of
       Directors of the Company, be adversely affected by disclosure in a
       registration statement at such time.

       Section 4. COOPERATION WITH COMPANY. The Investors will cooperate with
the Company in all respects in connection with this Agreement, including timely
supplying all information and confirmations reasonably requested by the Company
or the Commission (which shall include all information regarding the Investors
and proposed manner of sale of the Registrable Securities required to be
disclosed in any Registration Statement) and executing and returning all
documents reasonably requested in connection with the registration and sale of
the Registrable Securities and entering into and performing their obligations
under any underwriting agreement, if the offering is an underwritten offering,
in usual and customary form, with the managing underwriter or underwriters of
such underwritten offering. Nothing in this Agreement shall obligate any
Investor to consent to be named as an underwriter in any Registration Statement.
The obligation of the Company to register the Registrable Securities shall be
absolute and unconditional as to those Securities which the Commission will
permit to be registered without naming the Investors as underwriters. Any delay
or delays caused by the Investors by failure to cooperate as required hereunder
shall not constitute a Registration Default.

       Section 5. REGISTRATION PROCEDURES. If and whenever the Company is
required by any of the provisions of this Agreement to effect the registration
of any of the Registrable Securities under the Act, the Company shall (except as
otherwise provided in this Agreement), as expeditiously as possible, subject to
the Investors' assistance and cooperation as reasonably required with respect to
each Registration Statement:


                                  EX 10.3 - 4
<PAGE>


              (a) (i) prepare and file with the Commission such amendments and
       supplements to the Registration Statement and the prospectus used in
       connection therewith as may be necessary to keep such Registration
       Statement effective and to comply with the provisions of the Act with
       respect to the sale or other disposition of all securities covered by
       such registration statement whenever the Investors shall desire to sell
       or otherwise dispose of the same (including prospectus supplements with
       respect to the sales of securities from time to time in connection with a
       registration statement pursuant to Rule 415 promulgated under the Act)
       and (ii) take all lawful action such that each of (A) the Registration
       Statement and any amendment thereto does not, when it becomes effective,
       contain an untrue statement of a material fact or omit to state a
       material fact required to be stated therein or necessary to make the
       statements therein, in light of the circumstances under which they were
       made, not misleading and (B) the prospectus forming part of the
       Registration Statement, and any amendment or supplement thereto, does not
       at any time during the Registration Period include an untrue statement of
       a material fact or omit to state a material fact required to be stated
       therein or necessary to make the statements therein, in light of the
       circumstances under which they were made, not misleading;

              (b) (i) prior to the filing with the Commission of any
       Registration Statement (including any amendments thereto) and the
       distribution or delivery of any prospectus (including any supplements
       thereto), provide draft copies thereof to the Investors as required by
       Section 3(c) and reflect in such documents all such comments as the
       Investors (and their counsel) reasonably may propose respecting the
       Selling Shareholders and Plan of Distribution sections (or equivalents)
       and (ii) furnish to each Investor such numbers of copies of a prospectus
       including a preliminary prospectus or any amendment or supplement to any
       prospectus, as applicable, in conformity with the requirements of the
       Act, and such other documents, as such Investor may reasonably request in
       order to facilitate the public sale or other disposition of the
       securities owned by such Investor;

              (c) register and qualify the Registrable Securities covered by the
       Registration Statement under such other securities or blue sky laws of
       such jurisdictions as the Investors shall reasonably request (subject to
       the limitations set forth in Section 3(c) above), and do any and all
       other acts and things which may be necessary or advisable to enable each
       Investor to consummate the public sale or other disposition in such
       jurisdiction of the securities owned by such Investor;

              (d) list such Registrable Securities on the Principal Market, if
       the listing of such Registrable Securities is then permitted under the
       rules of such Principal Market;

              (e) notify each Investor at any time when a prospectus relating
       thereto covered by the Registration Statement is required to be delivered
       under the Act, of the happening of any event of which it has knowledge as
       a result of which the prospectus included in the Registration Statement,
       as then in effect, includes an untrue statement of a material fact or
       omits to state a material fact required to be stated therein or necessary
       to make the statements therein not misleading in the light of the
       circumstances then existing, and the Company shall use its best efforts
       to prepare and file a curative amendment under Section 5(a);

              (f) as promptly as practicable after becoming aware of such event,
       notify each Investor who holds Registrable Securities being sold (or, in
       the event of an underwritten offering, the managing underwriters) of the
       issuance by the Commission of any stop order or other suspension of the
       effectiveness of the Registration Statement at the earliest possible time
       and take all lawful action to effect the withdrawal, recession or removal
       of such stop order or other suspension;

              (g) cooperate with the Investors to facilitate the timely
       preparation and delivery of certificates for the Registrable Securities
       to be offered pursuant to the Registration Statement and enable such
       certificates for the Registrable Securities to be in such denominations
       or amounts, as the case may be, as the Investors reasonably may request
       and registered in such names as the Investors may request; and,


                                  EX 10.3 - 5
<PAGE>


       within three (3) Trading Days after a Registration Statement which
       includes Registrable Securities is declared effective by the Commission,
       deliver and cause legal counsel selected by the Company to deliver to the
       transfer agent for the Registrable Securities (with copies to the
       Investors) an appropriate instruction and, to the extent necessary, an
       opinion of such counsel;

              (h) take all such other lawful actions reasonably necessary to
       expedite and facilitate the disposition by the Investors of their
       Registrable Securities in accordance with the intended methods therefor
       provided in the prospectus which are customary for issuers to perform
       under the circumstances;

              (i) in the event of an underwritten offering, promptly include or
       incorporate in a prospectus supplement or post-effective amendment to the
       Registration Statement such information as the managers reasonably agree
       should be included therein and to which the Company does not reasonably
       object and make all required filings of such prospectus supplement or
       post-effective amendment as soon as practicable after it is notified of
       the matters to be included or incorporated in such Prospectus supplement
       or post-effective amendment; and

              (j) maintain a transfer agent and registrar for its Common Stock.

       Section 6. INDEMNIFICATION.

              (a) To the maximum extent permitted by law, the Company agrees to
       indemnify and hold harmless the Investors and each person, if any, who
       controls an Investor within the meaning of the Securities Act (each a
       "Distributing Investor") against any losses, claims, damages or
       liabilities, joint or several (which shall, for all purposes of this
       Agreement, include, but not be limited to, all reasonable costs of
       defense and investigation and all reasonable attorneys' fees and
       expenses), to which the Distributing Investor may become subject, under
       the Securities Act or otherwise, insofar as such losses, claims, damages
       or liabilities (or actions in respect thereof) arise out of or are based
       upon any untrue statement or alleged untrue statement of any material
       fact contained in any Registration Statement, or any related final
       prospectus or amendment or supplement thereto, or arise out of or are
       based upon the omission or alleged omission to state therein a material
       fact required to be stated therein or necessary to make the statements
       therein not misleading; provided, however, that the Company will not be
       liable in any such case to the extent, and only to the extent, that any
       such loss, claim, damage or liability arises out of or is based upon an
       untrue statement or alleged untrue statement or omission or alleged
       omission made in such Registration Statement, preliminary prospectus,
       final prospectus or amendment or supplement thereto in reliance upon, and
       in conformity with, written information furnished to the Company by the
       Distributing Investor, its counsel, affiliates or any underwriter,
       specifically for use in the preparation thereof. This indemnity agreement
       will be in addition to any liability which the Company may otherwise
       have.

              (b) To the maximum extent permitted by law, each Distributing
       Investor agrees that it will indemnify and hold harmless the Company, and
       each officer and director of the Company or person, if any, who controls
       the Company within the meaning of the Securities Act, against any losses,
       claims, damages or liabilities (which shall, for all purposes of this
       Agreement, include, but not be limited to, all reasonable costs of
       defense and investigation and all reasonable attorneys' fees and
       expenses) to which the Company or any such officer, director or
       controlling person may become subject under the Securities Act or
       otherwise, insofar as such losses, claims, damages or liabilities (or
       actions in respect thereof) arise out of or are based upon any untrue
       statement or alleged untrue statement of any material fact contained in
       any Registration Statement, or any related final prospectus or amendment
       or supplement thereto, or arise out of or are based upon the omission or
       the alleged omission to state therein a material fact required to be
       stated therein or necessary to make the statements therein not
       misleading, but in each case only to the extent that such untrue
       statement or alleged untrue statement or omission or alleged omission was
       made in such


                                  EX 10.3 - 6
<PAGE>


       Registration Statement, final prospectus or amendment or supplement
       thereto in reliance upon, and in conformity with, written information
       furnished to the Company by such Distributing Investor, its counsel,
       affiliates or any underwriter, specifically for use in the preparation
       thereof. This indemnity agreement will be in addition to any liability
       which the Distributing Investor may otherwise have.

              (c) Promptly after receipt by an indemnified party under this
       Section 6 of notice of the commencement of any action against such
       indemnified party, such indemnified party will, if a claim in respect
       thereof is to be made against the indemnifying party under this Section
       6, notify the indemnifying party in writing of the commencement thereof;
       but the omission to so notify the indemnifying party will not relieve the
       indemnifying party from any liability which it may have to any
       indemnified party except to the extent the failure of the indemnified
       party to provide such written notification actually prejudices the
       ability of the indemnifying party to defend such action. In case any such
       action is brought against any indemnified party, and it notifies the
       indemnifying party of the commencement thereof, the indemnifying party
       will be entitled to participate in, and, to the extent that it may wish,
       jointly with any other indemnifying party similarly notified, assume the
       defense thereof, subject to the provisions herein stated and after notice
       from the indemnifying party to such indemnified party of its election so
       to assume the defense thereof, the indemnifying party will not be liable
       to such indemnified party under this Section 6 for any legal or other
       expenses subsequently incurred by such indemnified party in connection
       with the defense thereof other than reasonable costs of investigation,
       unless the indemnifying party shall not pursue the action to its final
       conclusion. The indemnified parties as a group shall have the right to
       employ one separate counsel in any such action and to participate in the
       defense thereof, but the fees and expenses of such counsel shall not be
       at the expense of the indemnifying party if the indemnifying party has
       assumed the defense of the action with counsel reasonably satisfactory to
       the indemnified party unless (i) the employment of such counsel has been
       specifically authorized in writing by the indemnifying party, or (ii) the
       named parties to any such action (including any impleaded parties)
       include both the indemnified party and the indemnifying party and the
       indemnified party shall have been advised by its counsel that there may
       be one or more legal defenses available to the indemnifying party
       different from or in conflict with any legal defenses which may be
       available to the indemnified party or any other indemnified party (in
       which case the indemnifying party shall not have the right to assume the
       defense of such action on behalf of such indemnified party, it being
       understood, however, that the indemnifying party shall, in connection
       with any one such action or separate but substantially similar or related
       actions in the same jurisdiction arising out of the same general
       allegations or circumstances, be liable only for the reasonable fees and
       expenses of one separate firm of attorneys for the indemnified party,
       which firm shall be designated in writing by the indemnified party). No
       settlement of any action against an indemnified party shall be made
       without the prior written consent of the indemnified party, which consent
       shall not be unreasonably withheld so long as such settlement includes a
       full release of claims against the indemnified party.

       Section 7. CONTRIBUTION. In order to provide for just and equitable
contribution under the Securities Act in any case in which (i) the indemnified
party makes a claim for indemnification pursuant to Section 6 hereof but is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that the express provisions of Section 6 hereof provide
for indemnification in such case, or (ii) contribution under the Securities Act
may be required on the part of any indemnified party, then the Company and the
applicable Distributing Investor shall contribute to the aggregate losses,
claims, damages or liabilities to which they may be subject (which shall, for
all purposes of this Agreement, include, but not be limited to, all reasonable
costs of defense and investigation and all reasonable attorneys' fees and
expenses), in either such case (after contribution from others) on the basis of
relative fault as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company on the one hand or the applicable Distributing Investor on the other
hand, and the parties'


                                  EX 10.3 - 7
<PAGE>


relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Company and the Distributing Investor
agree that it would not be just and equitable if contribution pursuant to this
Section 7 were determined by pro rata allocation or by any other method of
allocation which does not take account of the equitable considerations referred
to in this Section 7. The amount paid or payable by an indemnified party as a
result of the losses, claims, damages or liabilities (or actions in respect
thereof) referred to above in this Section 7 shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.

       Notwithstanding any other provision of this Section 7, in no event shall
any (i) Investor be required to undertake liability to any person under this
Section 7 for any amounts in excess of the dollar amount of the proceeds
received by such Investor from the sale of such Investor's Registrable
Securities (after deducting any fees, discounts and commissions applicable
thereto) pursuant to any Registration Statement under which such Registrable
Securities are registered under the Securities Act and (ii) underwriter be
required to undertake liability to any person hereunder for any amounts in
excess of the aggregate discount, commission or other compensation payable to
such underwriter with respect to the Registrable Securities underwritten by it
and distributed pursuant to such Registration Statement.

       Section 8. NOTICES. All notices, demands, requests, consents, approvals,
and other communications required or permitted hereunder shall be in writing
and, unless otherwise specified herein, shall be (i) hand delivered, (ii)
deposited in the mail, registered or certified, return receipt requested,
postage prepaid, (iii) delivered by reputable air courier service with charges
prepaid, or (iv) transmitted by facsimile, addressed as set forth in the
Purchase Agreement or to such other address as such party shall have specified
most recently by written notice. Any notice or other communication required or
permitted to be given hereunder shall be deemed effective (a) upon hand delivery
or delivery by facsimile, with accurate confirmation generated by the
transmitting facsimile machine, at the address or number designated in the
Purchase Agreement (if delivered on a business day during normal business hours
where such notice is to be received), or the first business day following such
delivery (if delivered other than on a business day during normal business hours
where such notice is to be received) or (b) on the first business day following
the date of sending by reputable courier service, fully prepaid, addressed to
such address, or (c) upon actual receipt of such mailing, if mailed. Either
party hereto may from time to time change its address or facsimile number for
notices under this Section 8 by giving at least ten (10) days' prior written
notice of such changed address or facsimile number to the other party hereto.

       Section 9. ASSIGNMENT. This Agreement is binding upon and inures to the
benefit of the parties hereto and their respective heirs, successors and
permitted assigns. The rights granted the Investors under this Agreement may be
assigned to any purchaser of substantially all of the Registrable Securities (or
the rights thereto) from an Investor, as otherwise permitted by the Purchase
Agreement.

       Section 10. ADDITIONAL COVENANTS OF THE COMPANY. The Company agrees that
at such time as it otherwise meets the requirements for the use of Securities
Act Registration Statement on Form S-3 for the purpose of registering the
Registrable Securities, it shall file all reports and information required to be
filed by it with the Commission in a timely manner and take all such other
action so as to maintain such eligibility for the use of such form.

       Section 11. COUNTERPARTS/FACSIMILE. This Agreement may be executed in two
or more counterparts, each of which shall constitute an original, but all of
which, when together shall constitute but one and the same instrument, and shall
become effective when one or more counterparts have been signed by


                                  EX 10.3 - 8
<PAGE>


each party hereto and delivered to the other parties. In lieu of the original, a
facsimile transmission or copy of the original shall be as effective and
enforceable as the original.

       Section 12. REMEDIES. The remedies provided in this Agreement are
cumulative and not exclusive of any remedies provided by law. If any term,
provision, covenant or restriction of this Agreement is held by a court of
competent jurisdiction to be invalid, illegal, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions set forth herein
shall remain in full force and effect and shall in no way be affected, impaired
or invalidated, and the parties hereto shall use their best efforts to find and
employ an alternative means to achieve the same or substantially the same result
as that contemplated by such term, provision, covenant or restriction.

       Section 13. CONFLICTING AGREEMENTS. The Company shall not enter into any
agreement with respect to its securities that is inconsistent with the rights
granted to the holders of Registrable Securities in this Agreement or otherwise
prevents the Company from complying with all of its obligations hereunder.

       Section 14. HEADINGS. The headings in this Agreement are for reference
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement.

       Section 15. GOVERNING LAW, ARBITRATION. This Agreement shall be governed
by and construed in accordance with the laws of the State of New York applicable
to contracts made in New York by persons domiciled in New York City and without
regard to its principles of conflicts of laws. Any dispute under this Agreement
shall be submitted to arbitration under the American Arbitration Association
(the "AAA") in New York City, New York, and shall be finally and conclusively
determined by the decision of a board of arbitration consisting of three (3)
members (hereinafter referred to as the "Board of Arbitration") selected as
according to the rules governing the AAA. The Board of Arbitration shall meet on
consecutive business days in New York City, New York, and shall reach and render
a decision in writing (concurred in by a majority of the members of the Board of
Arbitration) with respect to the amount, if any, which the losing party is
required to pay to the other party in respect of a claim filed. In connection
with rendering its decisions, the Board of Arbitration shall adopt and follow
the laws of the State of New York. To the extent practical, decisions of the
Board of Arbitration shall be rendered no more than thirty (30) calendar days
following commencement of proceedings with respect thereto. The Board of
Arbitration shall cause its written decision to be delivered to all parties
involved in the dispute. Any decision made by the Board of Arbitration (either
prior to or after the expiration of such thirty (30) calendar day period) shall
be final, binding and conclusive on the parties to the dispute, and entitled to
be enforced to the fullest extent permitted by law and entered in any court of
competent jurisdiction. The Board of Arbitration shall be authorized and is
hereby directed to enter a default judgment against any party failing to
participate in any proceeding hereunder within the time periods set forth in the
AAA rules. The non-prevailing party to any arbitration (as determined by the
Board of Arbitration) shall pay the expenses of the prevailing party, including
reasonable attorneys' fees, in connection with such arbitration. Any party shall
be entitled to obtain injunctive relief from a court in any case where such
relief is available. The non-prevailing party to any injunctive proceeding (as
determined by the court) shall pay the expenses of the prevailing party,
including reasonable attorney's fees, in connection with such injunctive
proceeding.


                                  EX 10.3 - 9
<PAGE>


       IN WITNESS WHEREOF, the parties hereto have caused this Registration
Rights Agreement to be duly executed, on the day and year first above written.

                                       Dental/Medical Diagnostic Systems, Inc.


                                        By:  /S/ ROBERT H. GUREVITCH
                                             -----------------------------------
                                             Robert H. Gurevitch, President


                                       AMRO International, S.A.


                                        By:  /S/ H.U. BACHOFEN
                                             -----------------------------------
                                             H.U. Bachofen, Director


                                       The Endeavour Capital Fund, S.A.


                                        By:  /S/ SHMULI MARGULIES
                                             -----------------------------------
                                             Shmuli Margulies, Authorized
                                             Signatory


                                       Austinvest Anstalt Balzers


                                        By:  /S/ WALTER GRILL
                                             -----------------------------------
                                             Dr. Walter Grill, Authorized
                                             Signatory

                                       Esquire Trade & Finance, Inc.


                                        By:  /S/ ROLAND WINIGER
                                             -----------------------------------
                                             Roland Winiger, Authorized
                                             Signatory


                                  EX 10.3 - 10





                                                                    EXHIBIT 99.1

                DENTAL/MEDICAL DIAGNOSTIC SYSTEMS, INC. ANNOUNCES
                            $2 MILLION EQUITY FUNDING

WESTLAKE VILLAGE, CA. December 3, 1999 - Dental/Medical Diagnostic Systems,
Inc., (NASDAQ: DMDS, DMDSW) a manufacturer and supplier of high technology
dental equipment as well as tooth whitening and composite materials, today
announced the successful completion of a private round of financing, raising $2
Million in a direct placement of preferred stock and warrants to purchase common
stock.

"We are very pleased to have obtained this equity financing," said CEO Robert
Gurevitch. "The funds will be used to finance the continued roll-out of our new
product lines as well as for the continued sales of our digital radiography
line."

The preferred shares will accumulate a dividend of 4% annually and may be
exchanged for common shares of DMDS at a fixed exchange rate of $4.00 or at a
floating price depending on the price of DMDS upon the time of conversion.

The preferred shares hold a special conversion feature that allows the Company
to convert them in cash rather than common shares and are redeemable by the
company at any time. The investors were also issued warrants to purchase an
aggregate of 40,000 shares of Common Stock at an exercise price of $2.75.

Dental/Medical Diagnostic Systems, Inc. designs, develops, manufactures and
sells high technology dental equipment and related consumables. Currently, the
Company sells an intraoral camera system known as the TeliCam System and a
dental office networking system known as InTELInet.

The Company has developed its own technology for a tooth whitening and curing
system, the Apollo 95E, that began shipping outside the United States and Canada
in the first quarter of 1998 and domestically in the third quarter of 1998.

In a separate agreement, the Company supported the development of a
state-of-the-art dental digital x-ray system, which it began to market and ship
domestically at the end of Q3, 1999.

Disclosure Regarding Forward-Looking Statements:

This news release includes "forward-looking statements" within the meaning of
Section 27A of the Securities Act of 1933 ("Securities Act") and Section 21E of
the Securities Exchange Act of 1934 (the "Exchange Act"). Although the Company
believes that the expectations reflected in such forward-looking statements are
reasonable at this time, it can give no assurance that such expectations will
prove to have been correct. Forward-looking statements involve numerous risks
and uncertainties described in the Company's most recently filed Current Report
on Form 8-K, Quarterly Report on Form 10-Q and Annual Report on Form 10-K filed
with the Securities and Exchange Commission which should be read in conjunction
herewith, copies of which are available from the Company's investor relations
department. Actual results may differ materially from those


<PAGE>


contemplated by the forward-looking statements set forth herein. The Company
expressly disclaims any obligation or undertaking to release publicly any
updates or revisions to any statement herein or to reflect any change in the
Company's expectations or any change in events, conditions or circumstances on
which any such statement is based.


                                  EX 99.1 - 2


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