7 Jun
2006
7 Jun
'06
11:56 p.m.
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