1) Use MacsBug version 6.2 or later.
2) The reason for this behavior is that under A/UX you have a virtual root that
is accessible by all users (one at a time). A/UX 2.0 puts your personal
user directory onto the desktop so that you see it when you log in. To do
this, the Finder has "to play some games" with the UNIX file system to make
this seem like what the Finder expects. Folders on the desktop are at the
root level under the Macintosh OS, so we had to try to emulate that behavior
under A/UX. This is why your path to your home directory appears as "/".
It may be more proper from a UNIX standpoint to map the directory to its
real location, but if you need that functionality use "open" or "fopen"
instead of "sfgetfile".
3) No, that's not the correct behavior. Check the contents of your .login
file.
4) A/UX now uses the Berkeley file system. As "root" you have no limitations
on its use, as a normal user, there is a 10% overhead attached to each
partition that is not available to a normal user. This prevents unnecessary
disk thrashing if the partitions become full.