This is the one I have.
It's a Thinkpad R40.
I think I was trying to use 201's initially with a straight through BOB. That may have been the cause of the rough running steppers. I also found some things to diable in the bios as well as some of the IBM settings. I did have a problem that caused my router to crash and cut through a toggle clamp. I had screen saver and power settings set to none of course. No hibernation and always on.
Well the screen timed out and went black. Mach crashed when that happened. I finally got into the IBM features and found a little icon at the top that disables all time out settings.
It no longer times out and works great. Cost me a $22 carbide router bit and a $7 toggle clamp to find that little jewel of an issue. I also went back through and turned off all other services that I didn't think I would need. She is running pretty bare, but doing a great job now.