Legacy font
A legacy font is an 8-bit font modified to include non-standard characters in the upper range. Often called "special fonts," these are not intercompatible - often within the same country or even for the same language(s).
Most often a legacy font was created for a Latin-based orthography that needed certain special characters (known in Unicode as extended characters) and/or diacritics used in some language's orthography, but not present in available fonts.
Unicode fonts, which are all intercompatible, are being used in place of legacy fonts.
See also: Conversion to Unicode (of fonts and data)
N'Ko legacy fonts
People working on N'Ko designed some 8-bit fonts for that writing system (well before N'Ko was incorporated in Unicode). These include:
- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&item_id=GraphiteFontsKoli Nko Manden font developed by Mamady Doumbouya
- Kanjamadi fonts: Karifala Berete, Mading, Mamudu Bamba, Solomana Kante. http://kanjamadi.com/