tk860

I have a, Kenwood TK-860 450-476MHz model (ALHTK-860-1) I've been trying to program with no luck. Tried Windows 98, MSDOS, XP, DOS Box and through plain DOS 6.22 (Floppy Disk). I'm not sure if it's the programming cable or the computer or the radio. It just keeps telling me to check the...