[rescue] challenge L backplane

[Sheldon T. Hall]

Geoff Koehler writes ...
>
> In a nutshell, a deskside onyx backplane will support up to IR
> graphics, but only has a slot for 1 CPU board (up to 4CPU's), and 1 MC3
> board (2 G??).  The Challenge L backplane has no graphics support, but
> has more memory and CPU slots.

Heh.  The Challenge L can't take enough CPU or memory boards to suit me as
it is.  The doco says you can get 8-way memory interleaving if you have four
memory boards, but the L only has room for three.  On the other hand, it you
can have something like 15 or 20 SCSI busses....

I'd swap my Challenge L backplane for one with more eBUS slots and fewer VME
slots, but the Onyx backplane is the wrong direction.

-Shel