So your machine was switched to a X- machine. Thats parameters and a little wiring. That was common is the really old days of that machine, early lathes were x-, so machines of that vintage were switched to use existing programs. The secondary button to start the machine is normal, any Mori service guy worth his salt should have known that. Think it was even labeled Cont or something like that. Not sure on the rapid to Zero after a tool change, sounds like an offset issue. As far as wear offsets, I'm pretty sure it was an option on later 6 controls, not available on early 6 controls. There is probably 10 years difference in the 6 VS the 0, so things will be a lot different.