First off I've followed the advise of a vertex dealer (now retired) who gave me a list of computer requirements in order to program the 510 program. So I'm using a Toshiba Satellite, 75 mhz, windows 95, changed the comp port settings as recomended, installed the program in MS DOS and I'm still unable to read this radio. I'm about to take both the computer and radio and throw it out the window. Does anyone have any insight to this.