🚀 go-pugleaf

Hello, everyone.  I think I may have finally found the right place to ask.
 
I recently got three pro 350's with 5mb drives and 512k.  Two of the hard
disks have a pos login program installed which prevents me from seeing what's
on the hard drives.  The third does not have this login.  From what I can
tell, I've got parts of fortran and the like, but not everything.  I have
no docs, and almost no clue.  I finally found a box of ten rx50 disks in
a used furniture store 200 miles away.
 
I need:
      A copy of venix, unix, or anything close, so I can have a real os.
      A source for cheap rx50 disks or how to convert regular disks.
      Docs.
      A fortran (ok) or C (nifty) compiler.
-mark