[plex86] CVS updates

[Kevin Lawton]

Just minor additions.  Beginning the task of filling out some more
protected mode emulation; code transitions, task switches, etc.
Need some more of this before trying to run Windows.

-Kevin

>From ChangeLog:

  - "Kevin P. Lawton" <[EMAIL PROTECTED]>: Tue Oct 31 17:45:07 EST 2000
    Filled in a little more emulation of task switches
      and interrupt handling.