Originally Posted by Agama
I never have any problems with em, en etc. with my PRS-300 with the standard firmware and no extra fonts. I just make sure that my files are encoded as utf8. Non-breaking spaces can then be entered from the keyboard as <alt>255, en as <alt>0150 and em as <alt>0151. Smart quotes can also be used and many other special characters.
I believe boatat72 was referring to en-space
and em-space, whereas you're referring to en-dash
and em-dash. Very few readers have trouble with the dashes... it's the special space characters that are hit or miss (without embedded fonts).