I have a TTF font, that needs to be converted in FNT (and ideally in pcf too). I tried Fontforge, but when I loaded font and chose to generate font - nothing could be select
FNT is a bitmap format while TTF is an outline/vector format. To get FNT output, you'll first need to create a bitmap strike or strikes. Fontforge can do this if it has been built with Freetype included:
You should now have a bitmap strike to work with. Go to Generate Fonts; on the left side select 'No Outline Font', and on the right side select Windows FNT, pick the size you want, and generate.