PDP-11/23 Debugging

[Pete Turnbull]

On 07/11/2014 14:03, Ben Sinclair wrote:
> My machine is a PDP-11/23 with a H9273 backplane. I have, in this order
> from the top: M8186, M8043, M8044DF, and an M8012 at the bottom.

It shouldn't really matter on such a small configuration, but the M8044 
(MSV11-D) would normally be immediately below the processor, and the 
M8043 (DLV11-J) below that.  Other than that, I'd start by reseating 
things as Noel suggested, check the PSU especially the +5V line, and 
check the line-time clock signal (it may be wired to the AUX switch on 
your BA11-N box).

-- 
Pete Turnbull