ChangingBootAndOSDFont - mist-devel/mist-board GitHub Wiki

It is possible to use a custom font for the initial boot messages and OSD display.

You can use:

• firmware below 200516: system.fnt, the Atari font file, if you want to use it for initial boot messages. Otherwise, it will use the same font as the on-screen display.
• firmware since 200516: system.fnt is the common font file for on-screen display and MiST core initial boot messages. It must contain 8x8 fonts, 768 bytes (ASCII chars 32-127) or 1024 bytes (ASCII chars 0-127) length file. Fonts_MiSTer repo has a large collection of fonts.

The file system.fnt has to be put in the root directory of your FAT-formatted SD card.