difference between LSI-11 CPU's M7264 and M7270

[Allison]

Pete Turnbull wrote:
> On Sep 26 2005, 17:29, Gooijen, Henk wrote:
> 
>>>>BTW, I assume that you made a typo in the serpentine:
>>>>
>>>>> option2|option1
>>>>> option3|option4
>>>>> option5|option6
>>>>
>>>>That last line should be option6|option5, or ......?
>>>>
>>>
>>>As shown it is correct.  2,3,5 on the left: 1,4,6 on the right.
>>>it's one of the odder -11 backplanes.
> 
> 
>>>My source was the Microcomputer handbook 1976/77.
>>>I also have one with core in it.
> 
> 
>>thanks again!  Indeed odd, as that is not the "serpentine rule" !
>>I am sure that I would have made that mistake ...
> 
> 
> No, that's not right.  It's ordinary serpentine.  I don't have one, but
> I just checked the Microcomputer Handbook myself, and it's definitely
> like this:
> 
>  A    B      C    D
>       processor
> option 2    option 1
> option 3    option 4
> option 6    option 5
> 
> It's on page 6-3, and the expansion options, with the cable coming from
> where I've shown "option 6", are shown on 6-19.  It's also shown in the
> same arrangement on page 426 of the Microcomputer Interfaces Handbook.
> 
Explain the drawings on pages 6-19 and 6-20 of the 76/77 microcomputer 
handbook.

I do have Two.  One bare backplane and the other configured 11/2 system.

Allison