Support BIOS access with multiple images. Fixes some mutli-floppy installers: Dark Seed, Master of Magic, et al.
Implement INT 25h and INT 26h. Fixes some installers: Dark Seed, Gods, et al.
Allow low-level hacks for local drive HDD when floppy image(s) mounted. Fixes installing Amberstar from floppy images.
Use real pointer when writing faked sector contents.
Prevent problematic condition: booting floppy image files when floppy image(s) mounted.
FAT drive improvements regarding zero-length truncation of files.
Update Drive Parameter Table only when necessary.
