THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 NOR QUALIFIED UNDER APPLICABLE STATE SECURITIES ACTS AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED OR OTHERWISE DISTRIBUTED FOR VALUE UNLESS THEY ARE REGISTERED AND QUALIFIED UNDER SUCH ACTS OR THE CORPORATION RECEIVES AN OPINION OF COUNSEL FOR THE SELLER (CONCURRED IN BY COUNSEL FOR THE CORPORATION) STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT, PLEDGE OR DISTRIBUTION IS EXEMPT FROM THE REGISTRATION AND QUALIFICATION REQUIREMENTS OF SUCH ACTS. NOTE $ Boulder, Colorado , 1995 Pixsys, Inc., a Colorado corporation (the "Corporation"), for value received, promises to pay to the order of (NAME) at his office at __________________, _____________ (number of ) Dollars ($________), payable in one principal payment payable on demand, with interest from the date hereof on the unpaid principal balance at the rate of eleven percent (11%) per annum. This Note or any portion thereof may be prepaid at any time prior to the due date thereof, together with all accrued and unpaid interest to and including the date of such prepayment. This Note is secured by a Security Agreement dated as of March 24, 1995. The Corporation waives presentment for payment, notice of dishonor, protest and notice of protest and all other notices of every kind, to the fullest extent permitted by law. No delay on the part of the holder hereof in exercising any rights hereunder shall operate as a waiver of such rights. If this Note is not paid when due, the Corporation agrees to pay all reasonable costs of collection, including, without limitation, reasonable attorneys' fees incurred or paid by holder in enforcing this Note on default and in connection with the foreclosing of any of the security which secures this Note. The terms and conditions of this Note shall be governed by, and construed in accordance with, the laws of the State of Colorado. This Note shall be binding upon, and inure to the benefit of, the parties hereto, their personal representatives, heirs, devisees, successors and assigns. PIXSYS, INC. By: ------------------------------------- Title: President THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 NOR QUALIFIED UNDER APPLICABLE STATE SECURITIES ACTS AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED OR OTHERWISE DISTRIBUTED FOR VALUE UNLESS THEY ARE REGISTERED AND QUALIFIED UNDER SUCH ACTS OR THE CORPORATION RECEIVES AN OPINION OF COUNSEL FOR THE SELLER (CONCURRED IN BY COUNSEL FOR THE CORPORATION) STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT, PLEDGE OR DISTRIBUTION IS EXEMPT FROM THE REGISTRATION AND QUALIFICATION REQUIREMENTS OF SUCH ACTS. NOTE $(amount) Boulder, Colorado August 14, 1995 Pixsys, Inc., a Colorado corporation (the "Corporation"), for value received, promises to pay to the order of [NAME]at his office at ______________, _______________ (amount) ($____), payable in one principal payment due on February 13, 1996, with interest from the date hereof on the unpaid principal balance at the rate of eleven percent (11%) per annum payable on February 13, 1996. This Note or any portion thereof may be prepaid at any time prior to the due date thereof, together with all accrued and unpaid interest to and including the date of such prepayment. This Note is secured by a Security Agreement dated as of March 24, 1995. The Corporation waives presentment for payment, notice of dishonor, protest and notice of protest and all other notices of every kind, to the fullest extent permitted by law. No delay on the part of the holder hereof in exercising any rights hereunder shall operate as a waiver of such rights. If this Note is not paid when due, the Corporation agrees to pay all reasonable costs of collection, including, without limitation, reasonable attorneys' fees incurred or paid by holder in enforcing this Note on default and in connection with the foreclosing of any of the security which secures this Note. The terms and conditions of this Note shall be governed by, and construed in accordance with, the laws of the State of Colorado. This Note shall be binding upon, and inure to the benefit of, the parties hereto, their personal representatives, heirs, devisees, successors and assigns. PIXSYS, INC. By: ------------------------------------- Title: President THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 NOR QUALIFIED UNDER APPLICABLE STATE SECURITIES ACTS AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED OR OTHERWISE DISTRIBUTED FOR VALUE UNLESS THEY ARE REGISTERED AND QUALIFIED UNDER SUCH ACTS OR THE CORPORATION RECEIVES AN OPINION OF COUNSEL FOR THE SELLER (CONCURRED IN BY COUNSEL FOR THE CORPORATION) STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT, PLEDGE OR DISTRIBUTION IS EXEMPT FROM THE REGISTRATION AND QUALIFICATION REQUIREMENTS OF SUCH ACTS. NOTE $(amount) Boulder, Colorado March 24, 1995 Pixsys, Inc., a Colorado corporation (the "Corporation"), for value received, promises to pay to the order of [NAME] at their office at ____________, _____________ (amount) ($________), payable in one principal payment due on September 23, 1995, with interest from the date hereof on the unpaid principal balance at the rate of eleven percent (11%) per annum payable on September 23, 1995. This Note or any portion thereof may be prepaid at any time prior to the due date thereof, together with all accrued and unpaid interest to and including the date of such prepayment. This Note is secured by a Security Agreement dated as of March 24, 1995. The Corporation waives presentment for payment, notice of dishonor, protest and notice of protest and all other notices of every kind, to the fullest extent permitted by law. No delay on the part of the holder hereof in exercising any rights hereunder shall operate as a waiver of such rights. If this Note is not paid when due, the Corporation agrees to pay all reasonable costs of collection, including, without limitation, reasonable attorneys' fees incurred or paid by holder in enforcing this Note on default and in connection with the foreclosing of any of the security which secures this Note. The terms and conditions of this Note shall be governed by, and construed in accordance with, the laws of the State of Colorado. This Note shall be binding upon, and inure to the benefit of, the parties hereto, their personal representatives, heirs, devisees, successors and assigns. PIXSYS, INC. By: ------------------------------------- Title: President EXTENSION AGREEMENT Extension Agreement, dated as of March 31, 1996, between Image Guided Technologies, Inc., a Colorado Corporation ("Maker") and [NAME] ("Payee"). WHEREAS, Maker executed and delivered to Payee a promissory note ("Note"), dated (date), 1995, for $(amount), which note had previously been extended to March 31, 1996; WHEREAS, Maker and Payee desire further to extend the date on which principal and interest is due on the Note; NOW, THEREFORE, the parties hereto do hereby agree as follows: 1. The payment date for interest and principal due on the Note is hereby extended from March 31, 1996 to the earlier of (i) June 30, 1997 or (ii) thirty days after the closing of an underwritten public offering of the shares of Common Stock of Maker pursuant to a registration statement filed under the Securities Act of 1933, as amended, with aggregate offering proceeds from the public of not less than $5,000,000. 2. All other terms and conditions of the Note shall remain the same. IMAGE GUIDED TECHNOLOGIES, INC. By: ------------------------------------- Jeffrey J. Hiller Chief Financial Officer [NAME] By: ------------------------------------- EXTENSION AGREEMENT Extension Agreement, dated as of March 31, 1996, between Image Guided Technologies, Inc., a Colorado Corporation ("Maker") and [NAME] ("Payee"). WHEREAS, Maker executed and delivered to Payee a promissory note ("Note"), dated (date), 1995, for $(amount), which note had previously been PAYABLE ON DEMAND; WHEREAS, Maker and Payee desire further to extend the date on which principal and interest is due on the Note; NOW, THEREFORE, the parties hereto do hereby agree as follows: 1. The payment date for interest and principal due on the Note is hereby extended from PAYABLE ON DEMAND to the earlier of (i) June 30, 1997 or (ii) thirty days after the closing of an underwritten public offering of the shares of Common Stock of Maker pursuant to a registration statement filed under the Securities Act of 1933, as amended, with aggregate offering proceeds from the public of not less than $5,000,000. 2. All other terms and conditions of the Note shall remain the same. IMAGE GUIDED TECHNOLOGIES, INC. By: ------------------------------------- Jeffrey J. Hiller Chief Financial Officer [NAME] By: ------------------------------------- EXTENSION AGREEMENT Extension Agreement, dated as of FEBRUARY 13, 1996, between Image Guided Technologies, Inc., a Colorado Corporation ("Maker") and [NAME] ("Payee"). WHEREAS, Maker executed and delivered to Payee a promissory note ("Note"), dated (date), 1995, for $(amount), due on FEBRUARY 13, 1996; WHEREAS, Maker and Payee desire further to extend the date on which principal and interest is due on the Note; NOW, THEREFORE, the parties hereto do hereby agree as follows: 1. The payment date for interest and principal due on the Note is hereby extended from FEBRUARY 13, 1996 to the earlier of (i) June 30, 1997 or (ii) thirty days after the closing of an underwritten public offering of the shares of Common Stock of Maker pursuant to a registration statement filed under the Securities Act of 1933, as amended, with aggregate offering proceeds from the public of not less than $5,000,000. 2. All other terms and conditions of the Note shall remain the same. IMAGE GUIDED TECHNOLOGIES, INC. By: ------------------------------------- Jeffrey J. Hiller Chief Financial Officer [NAME] By: -------------------------------------