If you've tried to play this with the asimov disks, you'll know it
crashes after entering a dungeon.  After a bit tracing I discovered a
syntax error in the file DUNGON2 on side2 (dungeon disk):

1530  ... DRAW TM TO ...

which should be "DRAW TM AT"
Easy to fix with a sector editor.
T$03, S$0d, B$a0:  $c1 --> $c5
(or absolute $3da0)

Look likes a common case of bit rot.  Could be more problems with the
disk though.

Chris