It boot with 32 to fatopts secpertrk 4 to fatopts numheads!
I find the number from BIOS, and have to write the image to HD instead of USB.
Next issue: PS/2 keyboard is not working… 🥲

Update: comment out the mouse in init.fs, and now i’m seeing incredible slow mandelbrot from f<< /tests/manual/uxn/mandel.fs 😯