Hi Ron,

I hadn't replied earlier as I thought Alec may have. He is far more knowledgeable on these matters. I don't know the ramifications of the various upgrades. I believe that most of the software bugs were sorted out by Version 6. Version 7.0 was supplied with expansion cards (at least in more recent times) and was required to be installed before installing an expansion card. My KN6000 actually had Version 7.1 on it when I sold it (downloaded from Taiyo but no longer available on their site). I have upgraded a friends to 7.0 before installing an expansion card. It is important to verify the integrity of any upgrade disks before installing them. To do this insert the first disk with the KN switched off. Whilst holding down Panel memory buttons 2, 3 & 4, switch on the unit. The integrity of the first disk will then be checked and when prompted insert the second disk. If the OK message appears at the end of disk 2 verification, switch the unit off, re-insert Disk 1 and follow the detailed upgrade procedure. If the disks do not verify correctly, do not attempt to install them.

Cheers
Len C.