Anyone else here do AS/400?

I'm not entirely sure if this is off topic yet(hence why I put it on cctalk), but I know on a hobbyist level it's fairly rare. On Saturday I'll be picking up an AS/400 model 9406-600 originally purchased September 1997 with all the software and docs, licences etc that were ever used with the machine, from the original owner. I've contacted IBM and arranged license transfer (there was thankfully no charge) Does anyone else here deal with AS/400, or have a lingering interest in it? Secondly, I'm thinking of connecting a classic IBM terminal to it such as a 5251 S/34 term instead of the one that comes with it (something fairly modern, not sure of the model yet) I am curious; are any limitations on what I can connect, or are all twinax terminals pretty equal from a connectivity standpoint?