- Fix protect fault for 2-word instructions so that background tasks do not
crash.
- Lay the ground work for supporting the enhanced instruction set.
- Fix disk layout bug (disks are no longer compatible with previous version).
- Add debugging support for displaying MSOS 5 system requests.
- Fix bugs found by Coverity.
- add internal help entries
- add descriptions to the register, modifier and debug tables.
- changed device CD name to CDD to avoid name conflict with the CD command