Document:

LEASE ADDENDUM

This  amendment  supplements  and amends the  provisions of the Lease  Agreement
dated August 21, 1998, by and between TARGUN  PROPERTIES,  INC.  ("Lessor") and,
National  Scientific  Corporation  ("Lessee").  In the event of any  conflict or
inconsistency between the provisions of this Amendment and the provisions of the
Lease, this Amendment shall prevail.

                            18 MONTH LEASE EXTENSION
                              Offices #21, #23, #24

______ initials                                                  ______ initials

Effective Date:     September 1, 1999 to February 28, 2001

Rent Rate:          $2,300.00
Sales Tax:          $   43.70
                    ---------
Total               $2,342.70

Terms and  conditions:  Except  to the  extent  inconsistent  with the terms and
conditions  set forth  above,  all the  conditions  and covenant of that certain
Lease  Agreement  dated AUGUST 21,  1998,  as well as all  exhibits,  schedules,
attachments,  addendums  of  clarifications  shall be  binding  upon  Lessor and
Lessee. This agreement shall not constitute an agreement by the Lessor and shall
not be binding upon Lessor unless and until the  Agreement  shall be executed by
both parties.

AGREED TO this 27 day of July, 1999.

LESSEE:                                 LESSOR:
NATIONAL SCIENTIFIC CORPORATION         TARGUN PROPERTIES, INC.

/s/ Vernon Traylor Jr.                  /s/ Michael Targun
-----------------------------------     -----------------------------------
                                        Michael Targun

Its: Agent                              Its: President
-----------------------------------     -----------------------------------LEASE ADDENDUM

This  amendment  supplements  and amends the  provisions of the Lease  Agreement
dated August 21, 1998, by and between TARGUN  PROPERTIES,  INC.  ("Lessor") and,
NATIONAL  SCIENTIFIC  CORPORATION  ("Lessee").  In the event of any  conflict or
inconsistency between the provisions of this Amendment and the provisions of the
Lease, this Amendment shall prevail.

                     LEASE EXTENSION UNTIL SEPTEMBER 30,2001

Effective Date:            October 1, 1999

Rent Rate:                 $2300.00
Sales Tax:                 $  43.70
                           --------
Total                      $2343.70

Terms  and  conditions:  Except  to the  extent  inconsistent  with  the ten and
conditions set forth above, all the conditions and covenant of Sat certain Lease
Agreement   dated  August  21,  1998,  as  well  as  all  exhibits,   schedules,
attachments,  addendums  of  clarifications  shall be  binding  upon  Lessor and
Lessee. This agreement shall not constitute an agreement by the Lessor and shall
not be binding upon Lessor unless and until the  Agreement  shall be executed by
both parties.

AGREED TO this 15th day of September, 1999.

LESSEE:                                     LESSOR:
NATIONAL SCIENTIFIC CORPORATION             TARGUN

BY: /s/ VERNON TRAYLOR                      /s/ MICHAEL TARGUN
    ---------------------------------       ---------------------------------
    VERNON TRAYLOR                          MICHAEL TARGUN

Its: Agent                                  Its: PRESIDENTASSIGNMENT

     In consideration of Ten Dollars ($10.00) and other valuable  consideration,
of which we acknowledge  receipt,  we, EL-BADAWY AMIEN EL-SHARAWY,  of 1434 East
Spur Avenue, Gilbert,  Arizona 85296, and MAJID M. HASHEMI, of 1030 E. El Camino
Real, No. 502,  Sunnyvale,  CA 94087,  (the Inventors)  hereby sell, and assign,
subject to the conditions set forth below, to NATIONAL  SCIENTIFIC CORP., having
offices at 4455 E. Camelback  Road,  Suite E160,  Phoenix,  Arizona  85018,  its
successors  and  assigns,  the entire  right,  title and  interest in and to the
improvements  of  HETEROJUNCTION  BIPOLAR  TRANSISTOR  HAVING WIDE BANDGAP,  LOW
INTERDIFFUSION  BASE-EMITTER  JUNCTION,  (the  Invention)  invented  by  us,  as
described in the  application  for United States Patent  Application  Serial No.
08/939,487 filed 29 September 1997 (M&G Docket Number 2238-010), and any and all
applications for patent and patents therefor in any and all countries, including
all divisions, reissues, continuations and extensions thereof, and all rights of
priority  resulting  from the  filing of said  United  States  application,  and
authorize and request any official whose duty it is to issue  patents,  to issue
any  patent  on said  improvements  or  resulting  therefrom  to  said  NATIONAL
SCIENTIFIC  CORP.,  or its  successors  or assigns and agree that on request and
without further consideration,  but at the expense of NATIONAL SCIENTIFIC CORP.,
we will communicate to said NATIONAL SCIENTIFIC CORP., or its representatives or
nominees,  any facts known to us respecting said improvements and testify in any
legal proceeding, sign all lawful papers, execute all divisional, continuing and
reissue  applications,  make all  rightful  oaths and  generally  do  everything
possible to aid NATIONAL SCIENTIFIC CORP., its successors, assigns and nominees,
to obtain  and  enforce  proper  patent  protection  for said  invention  in all
countries.  The  above-discussed  conditions  are as follows:  a) that  NATIONAL
SCIENTIFIC  CORP.  pay all costs related to United States  filing,  prosecution,
issuance,  and  maintenance  of United  States  Patent  Application  Serial  No.
08/939,487,  b) that NATIONAL  SCIENTIFIC  CORP. pay all consulting fees owed to
the  inventors with respect to the Invention,  c) that NATIONAL SCIENTIFIC CORP.
<PAGE>
ASSIGNMENT
S/N: 08/939,487
Page: 2

pay  1% of  all  gross  sales  related  to  the  Invention  to  EL-BADAWY  AMIEN
EL-SHARAWY,  d) that NATIONAL SCIENTIFIC CORP. pay 1% of all gross sales related
to the Invention to MAJID M. HASHEMI, e) that NATIONAL SCIENTIFIC CORP. actively
develop and market the Invention,  and f) that NATIONAL  SCIENTIFIC CORP. remain
solvent  as  evidenced  by  refraining  from  filing for  bankruptcy  under U.S.
Bankruptcy  law.  Should any of the  above-discussed  conditions fail to be met,
then this Assignment shall be deemed void AB INITIO. The Inventors covenant with
said NATIONAL SCIENTIFIC CORP., its successors and assigns,  that the rights and
property  hereby covered are free and clear of any  encumbrances,  and that they
have full right to convey the same as herein expressed.

3/23/98                                 /s/ Lou Ross
-------                                 ----------------------------------------
DATE                                    Lou Ross
                                        Chairman and C.E.O.
                                        NATIONAL SCIENTIFIC CORP.

STATE OF ARIZONA    )
                    ) ss
County of Maricopa  )

     On this 23 day of 1998, before me, the undersigned, personally appeared Lou
Ross,  known to me to be the  person  whose  name is  subscribed  to the  within
instrument, and acknowledged to me that he executed the foregoing instrument for
the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

                                        /s/ Vernon M. Traylor, Jr.
                                        ----------------------------------------
                                        NOTARY PUBLIC

(SEAL)

[NOTARY SEAL]
<PAGE>
ASSIGNMENT
S/N: 08/939,487
Page: 3

3/31/98                                 /s/ El-Badawy Amien El-Sharawy
-------                                 ----------------------------------------
DATE                                    EL-BADAWY AMIEN EL-SHARAWY

STATE OF ARIZONA    )
                    ) ss
County of Maricopa  )

     On this 31st day of March  1998,  before  me, the  undersigned,  personally
appeared EL-BADAWY AMIEN EL-SHARAWY,  known to me to be the person whose name is
subscribed to the within instrument, and acknowledged to me that he executed the
foregoing instrument for the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

                                        /s/ Flora D. DeBeer
                                        ----------------------------------------
                                        NOTARY PUBLIC
                                        My Commission Expires July 22, 1999

(SEAL)

4-15-98                                 /s/ Majid M. Hashemi
-------                                 ----------------------------------------
DATE                                    MAJID M. HASHEMI

STATE OF California    )
                       ) ss
County of Santa Clara  )

     On this 15th day of April  1998,  before  me, the  undersigned,  personally
appeared MAJID M. HASHEMI, known to me to be the person whose name is subscribed
to the within instrument,  and acknowledged to me that he executed the foregoing
instrument for the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

                                        /s/ Har R. Choi
                                        ----------------------------------------
                                        NOTARY PUBLIC

(SEAL)
[NOTARY SEAL]ASSIGNMENT

     In consideration of Ten Dollars ($10.00) and other valuable  consideration,
of which we acknowledge  receipt,  we, EL-BADAWY AMIEN EL-SHARAWY,  of 1434 East
Spur Avenue, Gilbert, Arizona 85296, and MAJID M. HASHEMI, of 1363 Corte Bonita,
San Jose CA 95120,  (the  Inventors)  hereby  sell,  and assign,  subject to the
conditions set forth below, to NATIONAL SCIENTIFIC CORP., having offices at 4455
E. Camelback  Road,  Suite E-160,  Phoenix,  Arizona  85018,  its successors and
assigns,  the entire  right,  title and interest in and to the  improvements  of
VERTICAL  HETEROJUNCTION BIPOLAR TRANSISTOR,  (the Invention) invented by us, as
described  in the  application  for United  States  Patent  (M&G  Docket  Number
2238-010),  and any and all  applications for patent and patents therefor in any
and  all  countries,  including  all  divisions,  reissues,   continuations  and
extensions thereof, and all rights of priority resulting from the filing of said
United States application,  and authorize and request any official whose duty it
is to issue  patents,  to issue any  patent on said  improvements  or  resulting
therefrom to said NATIONAL  SCIENTIFIC  CORP.,  or its successors or assigns and
agree that on request and without further  consideration,  but at the expense of
NATIONAL  SCIENTIFIC  CORP.,  we will  communicate  to said NATIONAL  SCIENTIFIC
CORP., or its representatives or nominees, any facts known to us respecting said
improvements  and  testify  in any legal  proceeding,  sign all  lawful  papers,
execute all divisional,  continuing and reissue applications,  make all rightful
oaths and generally do everything possible to aid NATIONAL SCIENTIFIC CORP., its
successors, assigns and nominees, to obtain and enforce proper patent protection
for said  invention in all  countries.  The  above-discussed  conditions  are as
follows:  a) that  NATIONAL  SCIENTIFIC  CORP.  pay all costs  related to United
States filing,  prosecution,  issuance,  and maintenance of United States Patent
Application,  b) that NATIONAL  SCIENTIFIC CORP. pay all consulting fees owed to
the inventors with respect to the Invention,  c) that NATIONAL  SCIENTIFIC CORP.
pay  1% of  all  gross  sales  related  to  the  Invention  to  EL-BADAWY  AMIEN
EL-SHARAWY,  d) that NATIONAL SCIENTIFIC CORP. pay 1% of all gross sales related
to the Invention to MAJID M. HASHEMI, e) that NATIONAL SCIENTIFIC CORP. actively
<PAGE>
ASSIGNMENT
VERTICAL HETEROJUNCTION BIPOLAR TRANSISTOR
Page: 2

develop and market the Invention,  and f) that NATIONAL  SCIENTIFIC CORP. remain
solvent  as  evidenced  by  refraining  from  filing for  bankruptcy  under U.S.
Bankruptcy  law.  Should any of the  above-discussed  conditions fail to be met,
then this Assignment shall be deemed void AB INITIO. The Inventors covenant with
said NATIONAL SCIENTIFIC CORP., its successors and assigns,  that the rights and
property  hereby covered are free and clear of any  encumbrances,  and that they
have full right to convey the same as herein expressed.

11/16/99                                /s/ Lou Ross
--------                                ----------------------------------------
DATE                                    Lou Ross
                                        Chairman and C.E.O.
                                        NATIONAL SCIENTIFIC CORP.

STATE OF ARIZONA    )
                    ) ss
County of Maricopa  )

     On this 16 day of November  1999,  before me, the  undersigned,  personally
appeared Lou Ross,  known to me to be the person whose name is subscribed to the
within  instrument,  and  acknowledged  to me that  he  executed  the  foregoing
instrument for the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

[NOTARY SEAL]                           /s/ Vernon M. Traylor Jr.
                                        ----------------------------------------
                                        NOTARY PUBLIC

11/15/99                                /s/ El-Badawy Amien El-Sharawy
--------                                ----------------------------------------
DATE                                    EL-BADAWY AMIEN EL-SHARAWY
<PAGE>
ASSIGNMENT
VERTICAL HETEROJUNCTION BIPOLAR TRANSISTOR
Page: 3

STATE OF ARIZONA    )
                    ) ss
County of Maricopa  )

     On this 15 day of November  1999,  before me, the  undersigned,  personally
appeared EL-BADAWY AMIEN EL-SHARAWY,  known to me to be the person whose name is
subscribed to the within instrument, and acknowledged to me that he executed the
foregoing instrument for the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

                                        NOTARY PUBLIC

11/15/99                                /s/ Majid M. Hashemi
--------                                ----------------------------------------
DATE                                    MAJID M. HASHEMI

STATE OF ARIZONA    )
                    ) ss
County of Maricopa  )

     On this 15 day of November  1999,  before me, the  undersigned,  personally
appeared MAJID M. HASHEMI, known to me to be the person whose name is subscribed
to the within instrument,  and acknowledged to me that he executed the foregoing
instrument for the purposes therein contained.

     IN WITNESS WHEREOF, We have set my hand and official seal.

[NOTARY SEAL]                           /s/ Vernon M. Traylor Jr.
                                        ----------------------------------------
                                        NOTARY PUBLIC

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