I once wrote a font editor on my IBM PCjr (one of the slowest PCs ever). The fun part was learning just enough machine language so the editor could load the fon

I once wrote a font editor on my IBM PCjr (one of the slowest PCs ever). The fun part was learning just enough machine language so the editor could load the font into a certain part of the RAM, protect the area and "terminate and stay resident". I also made a version of the font editor which would download fonts to my dot matrix printer. If I remember correctly, those had to be loaded each time the printer was rebooted. Fun times.