Date   : Sun, 02 Nov 2008 14:26:06 +0000
From   : acorn@... (Andy Ford)
Subject: Econet on BBC issue 3 , having problems

Pete Turnbull wrote:
> If the 8271 isn't fitted, has link S9 been re-made?  It controls the NMI 
> from the disk controller.  The NMI is shared with the Econet, and if 
> either isn't fitted but the appropriate link is still open, the NMI 
> won't work properly.  And you've cut or removed S2, yes?  That's the NMI 
> enable for the Econet.
>
>   

Thank you both for your replies :)

Progress is as follows...

S2 is already open (I would guess this was done when the disk interface 
was originally fitted)

To recap: After making S5 south the No Clock message disappeared, but I 
was unable to get a response. I then fitted an 8271 and the machine 
(econet-wise) functioned perfectly :)

I am a bit unsure about S9, it is currently open so I re-connected it as 
advised, but this resulted in a repeat of the problem.

Interestingly, someone has already connected a small wire from S9 (the 
right / east-most) pad) to IC27 (a 14 pin sn7438 device) pin 9. I am not 
sure if this is now causing the problem and whether I should remove this 
"extra" wire that someone had previously fitted (I do not know the 
reason for this extra wire)

I'm wondering now whether to cut this link wire (S9 East to IC27 pin9) , 
or to leave an 8271 installed and leave S9 open...

Any advice would be appreciated again.


Thanks.

Andy.