difference between LSI-11 CPU's M7264 and M7270

[Gooijen, Henk]

Ok, back home, and thanks to all suggestions, I found the following.
Barely visible is the writing H9270, so that clears up what backplane
is installed in the card cage. The power supply is indeed an H780.
I have a copy of "microcomputer handbook" 1976-77, and on page 2-4
at the bottom is figure 2-2 which shows (literally, table and text):

            A        B        C        D  
     ------------------+------------------
   1 |   position  1   |   position  2   |  <--- positions 1 & 2 are
     ------------------+------------------      normally used for
   2 |   position  4   |   position  3   |      the processor module
     ------------------+------------------      in single backplane
   3 |   position  5   |   position  6   |      systems and the first
     ------------------+------------------      backplane in multiple
   4 |   position  8   |   position  7   |      backplane systems
     ------------------+------------------

Anyway, I was enough assured to apply power. Double joy, because the
fans do not make an awful high pitched sound, just "normal" blowing,
and I got on the terminal the output
173002
@
So, that looks like one more system in my collection :-)  Lucky for
me it is a small system.  I need something more to make it usable.
The RXV11 from Pete Collum crossed my mind ...

  thanks for all good info!
- Henk, PA8PDP.