Can anyone please clear up this point to me: another thread here mentioned how some manufacturers will not configure the Y1/Y2 motors properly and connect them to the same driver/port on the controller. What is this about? What should I be asking to make sure this doesn't happen on my machine? I already verified there would be a driver for each of the four Yaskawa motors.

Also, what are the differences between 6MB and 21A? Some claim 21A is newer while 6MB is 10 years old, but there isn't a lot of info on 21A out there so I'm a bit worried about going with it. From the few images I did get of 21A, it seems to be using a Windows XP as a front end with a PC keyboard, which sound like a potential issue to me.