To see sample of one font on a Datadisk terminal, R DDFONT and give
  it the name of the font (e.g. "NGR30").
To print a sample of a particular font on the XGP, say
  R FCOPY;<file name>/INFO/SAMPLE.  Say HELP FCOPY to learn more of its
  capabilities.
To or edit characters in an existing font, use EDFONT, described in
  EDFONT.TVR[UP,DOC].
To create a new font use TVFONT, described in TVFONT.BGB[UP,DOC].
To combine selected characters from two fonts, use COMBIN (say "HELP
   COMBIN" for description).
To compile a font, RUN UFC[XGP,SYS].  UFC.REG[UP,DOC] explains what
  compiling a font means, and why it's good for you.
To learn about the format of font files, see FORMAT.DOC[XGP,SYS].

Some of the above programs append the ".FNT[XGP,SYS]" if you leave it
  out, but all of them (I think) will accept the complete file name if
  you type it all.