In fact, the project was needed to create bootable images using purely fasm tool. I never got to the FAT32 implementation.

Use F1 for help.

macomics, apparently this video mode is non-standard, as a result of which the font has shrunk in height. Have you tried installing your own font int-10h AH=11h ? A large collection for MS-DOS in *.fnt format can be downloaded from here: http://old-dos.ru/index.php?page=files&mode=files&do=show&id=6039

@Core i7, of course I tried. This is how Russian fonts work for me. And this mode simply truncates every other line (the char size is 8*8, instead of 8*16). This is one of the standard VGA text modes. There is also an 80*43 mode (the char size is 8*9).

You can switch to these modes using the standard mode from DOS.

Maybe your HEX DUMP would be best moved to your own POST instead of changing the subject in my POST. I find HEX DUMPS almost useless, and it was one of my first .ASM projects as a NEWBEE, decades ago.