EXHIBIT 4.3 ADDENDUM TO CONVERTIBLE DEBENTURE AND WARRANT TO PURCHASE COMMON STOCK This Addendum to Convertible Debenture and Warrant to Purchase Common Stock ("Addendum") is entered into as of the 21st day of June 2005 by and between Ultradata...Convertible Debenture and Warrant Addendum • June 27th, 2005 • Ultradata Systems Inc • Office machines, nec
