- The PC BIOS comes from the Bochs project
  (http://bochs.sourceforge.net/). A patch from bios.diff was applied.

- The VGA BIOS comes from the LGPL VGA bios project
  (http://www.nongnu.org/vgabios/).

- The Cirrus VGA BIOS comes from the LGPL VGA bios project with
  patches from http://ebisa.hp.infoseek.co.jp/bochs/index.shtml.