Thats a real wierd screen. hmm...
But what happend is that you have tripped a software end switch.
Press "clear", if I remember right, and jog of the endswitch and all chould be fine with that part.
If I understand it right the machine does move in "the wrong" direction and does not know where to stop etc?
Have you entered all you MC (machine constants) in the right way?
If the machine has been sitting still for a while the control battery will go dead and all MC are lost.
Hopefully you got the MC at paper or floppy disk othervise it should be in the cabinet at a punsh hole tape...but that takes a reader to read.
Så if not done yeat, check and if needed, change youre battery.
Then reenter youre MC.
Once done, get to work trying to get the conection between the machin and a PC to work so you can save alldata from the machin to the PC for future conviniance.
Good luck, I'm not very far ahead of you but if you look in some of the post at this and other forums you will pic up really quick I guarantie.