Font Atlas Generator is an editor-only Unity tool that you can use to generate tilesheets from any .ttf font with any characters the font supports.
NOTE: Please be aware of the license for any fonts you use with this tool. Most fonts have very restrictive licenses, just because you generate a tilesheet from it doesn't change the license requirements.
The generator takes a string of characters and generates the tilesheet in a grid format. There is a preset for Code Page 437:
You will almost always have to tweak the values a bit to get the glyphs to line up and to get it looking sharp:
Most truetype fonts you'll find only support a very limited range of characters. If you change the dynamic font setting you can use a fallback font to replace any missing glyphs:
You can also adjust the text and background colors for your output texture as needed - including transparent backgrounds:
