8 Jun
2006
8 Jun
'06
5:56 a.m.
Thanks to everyone who helped me figure this out. It can be confusing
sometimes when you think you've looked everywhere and it's still just in the
wrong place.
Unfortunately, after properly checking the NPG and BG lines for continuity,
I found that they are wired properly - I was hoping for something simple
like that :(
So now that I know those lines are solid, and I know the Power supply is
outputting what it's supposed to, where do I go from here?
Note awhile back I had a few very slightly bent pins, I straightened them
ever so carefully, so I ruled out shorts between pins touching in case
you're curious.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Tony Duell
Sent: Wednesday, June 07, 2006 6:56 PM
To: cctalk at classiccmp.org
Subject: Re: My continuing 11/34 confusion
Alright.
I know this is a very COMMON problem, but the other COMMON problem is
there
seems to be no good explanation as to what pins are
what on the damn
backplane. I know I may be coming off sort of abrasive here (no offense
meant to Henk or anyone else) but even the 11/34 documentation *also*
talks
about the bus grant path and gives no pin explanation
on the backplane -
you're just supposed to inherently know where the connection between CA1
and
CB1 is in a mass of pins and wire.
I've looked through what manuals are available on bitsavers and manx, and
got nothing at all that I could make sense of.
All I'm looking for is simple pin labling for a DD11 9 slot backplane.
Why
was this so hard to put in the manual?
OK, here you are :
A pin reference is of the form 2AF1 (that is, digit, letter, leter, digit)
The first digit is the slot number. Slot 1 is on the right, looking at
the side you plug the boards into. The component side of the boards faces
towards slot 1
The next letter is the sub-connector in the slot. It'll be A up to F.
Slot A is the rearmost one, slot F is the frontmost (again, looking at
the backplane from the 'board side' as you have it in the BA11-K
The next letter is the row of the pin. There are 18 rows, since there are
18 pins down each side of the connector. The letters used, in order, are :
A B C D E F H J K L M N P R S T U V
Again, row F is the rearmost
And the last digit gives the side. Side one is the component side, side 2
the solder side.
-tony