difference between LSI-11 CPU's M7264 and M7270

[Gooijen, Henk]

 Hi,

I cleaned the dust out of a small 4 slot card cage with the power supply
at the right side. I was never good at naming the BA box types, so here is
the description. When you look at the front side, the 4 slots are at the
left side, and the PSU is at the right side and has at the front 3 switches
(DC on/off, enable/halt, and LTC on/off) and 2 LEDs (DC on and run).
The following cards are installed (I have not yet powered up this unit).

   <------ M7270 ------> <------ M8044 ------> ==================
   <------ empty ------> <------ M7940 ------> |  o o  __ __ __ |
   <------ empty ------> <------ empty ------> |       ~~ ~~ ~~ |
   <------ empty ------> <------ empty ------> ==================

I have 2 questions from this system.
1) As I am not that familiar with QBUS, are the cards in the correct slot?
2) The M8044 says on the handle "M8044-DK" but on the board is in the etch
   "M8045" and "16KW x 18 BIT" (IIRC that last part). Strange or common ?

An other thing is the following.  I also have a M7264. This board is quad
sized,
but has 4 kW memory on the CPU board. The M7270 is dual sized (with no RAM).
Can I remove the M7270 and M8044 and put the M7264 instead in the above
rack?
The reason for this swap is that I hoipe one day to add a M8018 (WCS), and
as far as I know, the WCS option does not work with the M7270, but only with
the M7264. Is this correct?
And *if* the M7264 is installed, can I then move the M7940 to the left in
the
same slot and put in the open space the M8044?
A lot of questions ... I am really into UNIBUS machines, but this small
system
is too cute to put away!

  thanks,
- Henk, PA8PDP.