As far as I know you can only program in Z80 Assembly and TI Basic, besides the fact that the Z80 processor (15mhz) could never handle a program like Easy-C.
Now programming the TI to output to the robot might be possible but I would be very impressed to see it happen. Apparently someone tried it, not sure how far they got
http://www.chiefdelphi.com/forums/sh...highlight=TI83