The font data here must be in the same order as the Char enum. This is
based the cp850-8x16 font from FreeBSD. See
http://web.mit.edu/freebsd/head/share/syscons/fonts/cp850-8x16.fnt. It
has been modified to include Teletext 'sixels' (block graphic glyphs)
instead of the usual extended ASCII characters from Code Page 850.