you want to play a dvd on a 233 machine? that's gonna be a painful experience. you *might* be ok if you use http://mplayerhq.hu
as well as being by far far far the best meadia player on linux it can run on very low resources, as long as you use decent video outputs. on a 233 though you might be pushing it a little too far. firstly never try and run it inside Xwindows, always go from a plain console, and use the vesa or fbdev video output as root. also make sure you never ever apply any video filtering and such like.