- fix NetBSD not booting from cdrom. AH was not set to 0 after a   successful read through int13/AH=2 when emulation floppy from cdrom.
- fix NetBSD not booting from cdrom. AH was not set to 0 after a
  successful read through int13/AH=2 when emulation floppy from cdrom.

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet