Microvax II hardware not recognized

[Jon Elson]

On 08/19/2016 12:36 PM, Douglas Taylor wrote:
>
> The MicroVax II is about 30 years old, should I suspect 
> the backplane?  How do you clean it?  Should I try another 
> CPU card?
>
My cobbled-together uVAX-II ran continuously from 1986 to 
2007. Sometime in the late 1990s, it started to get flaky.  
It was always backplane-related, devices would become 
inaccessible, and powering down and reseating the boards 
always brought it back.  Every few years, I would pull all 
the boards and vacuum the board side of the backplanes and 
wipe down the board edge fingers with an alcohol-soaked 
paper towel.  The reseating would always clear the trouble 
for several months.

Jon