On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via cctalk
<cctalk at classiccmp.org> wrote:
  I think the FP11 boards are not essential for the
11/70
 They only add hardware FP support. 
Not essential for many uses, but I'm pretty sure UNIX is unhappy
without them.  If you are going to run RSTS/E or RT-11, should be just
fine either way.
  However, I think that the cache boards are essential.
 Not sure the 11/70 will work without them. 
Agreed.  I think those _are_ mandatory.
Cheers,
-ethan