You may download FontEdit program, that is a very simple font editor, and modify the included SAMPLE.FNT file to create the fonts you want. Yes, a 1x1 font size is valid, but in order to successfully install a font for the command-line window, you must follow the Necessary criteria for fonts to be available in a command window.
This is a summary of those requirements for bitmap fonts, besides another ones I found searching the web:
- The font must be a fixed-pitch font.
- The font cannot be an italic font.
- If it is not a TrueType font, it must be OEM_CHARSET.
- If it is not a TrueType font, the face name must be "Terminal".
- Point size should be between 5 and 72.
To install the font, right-click on the font file and select "Install", or open Fonts via Control Panel and drag and drop the font file. Note that you can keep installed just one bitmap font with "Terminal" face at a time, that is, the installation of a second font (for example, a different size) replaces the previous one.