difference between LSI-11 CPU's M7264 and M7270 - test-drb@ccmp.vtda.org

26 Sep 2005

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.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York