IBM DOS - National Language Supplement
Consists of a manual and disk.
From Per at the VCFF:
"I recently got hold of something that might be of interest, the IBM National Language Supplement. Along with it was disk containing drivers for all of IBMs European PC-keyboards/character-sets, and a tool (NRL) for installing the correct driver to a DOS boot-disk.
You can find an image of the disk at here.
The manual has listings with the different character sets used in some localizations. It tells of two different fonts besides the standard US font: Nordic and Portugese.
I hope this comes in handy somehow! "
A Greek reference to the National Language Supplement is at here.