[11/34A] ARRRRGH!! <sound of head banging on wall>

From: Tony Duell <ard_at_odin.phy.bris.ac.uk>
Date: Thu Nov 13 03:25:25 1997

On Wed, 12 Nov 1997, Daniel A. Seagraves wrote:

> On Tue, 11 Nov 1997, Tony Duell wrote:
>
> > OK. They're on the 3rd connector from the back (2 connectors behind them,
> > 3 in front). They're the rearmost 2 pins on the righthand side (looking
> > from the _TOP_ of the backplane). You'll find they're linked by a little
> > loop of wire close to the backplane. That's what you should have cut.
> >
> > What, in fact, did you cut?
>
> 4th set from the frontpanel, pins 1 and 2 closest to the PSU.
>
> PSU
> 6
>
> 5
>
> 4 \
>
> 3
>
> 2
>
> 1
>

It sounds like you cut the right thing. I think it's high time we used the
official DEC naming of the pins to avoid confusion (Should this go in a
FAQ somewhere??)

OK. The complete hex slots are _numbered_, starting with 1 on the far
right. In an 11/34 the CPU boards are in slots 1 and 2.

The individual subslots (6 to a slot here) are lettered, with A nearest
the PSU and F nearest the front panel in this machine. If you pull a
card, set it down component side up, edge fingers towards you, then A is
on the right, F on the left

The pins in the slot are also lettered, using DEC's alphabet which avoids
characters that could be confused. Starting at the back (PSU side), they
are called : A B C D E F H J K L M N P R S T U V.

The sides of the board are numbered. Side 1 is the component side, Side 2
is the solder side.

Now, you want to cut the jumper between CA1 and CB1 (the 2 pins are on the
same connector). So, that's on the 3rd connector from the PSU (2 between
it and the PSU, 3 between it and the front panel), the rearmost (closest
to the PSU) 2 pins on the component side of the board.

Can you find it from that description?

Just one quick thing. Pull the UDA50 cards. Check that (a) one of the
cards (I think it's the one without the disk cable) has traces from those
2 pins going into the logic and (b) the other card has these 2 pins
shorted together.


>

-tony
Received on Thu Nov 13 1997 - 03:25:25 GMT