OSDev.org

http://my.execpc.com/~geezer/osd/pmode/v86mm.zip

- Public domain
- Requires NASM and DJGPP to build
- Runs under plain DOS or from bootsector
- Tested on Pentium and 486 systems and under Bochs
- Does not use TSS for task-switching
- Kernel reports what I/O ports were used by V86 code
- V86 code runs at IOPL=0 or IOPL=3

Great! that's precious stuff ... the http://www.osdev.org/osfaq2/index.php/VirtualMonitor has been greatly improved thanks to your submission