looking for a working 11/05 (KD11-B) board setu

[Tony Duell]

> 
> Tony has a good point here: it's usually the support stuff (power supplies,=
>  connectors) that bugger up a machine of this simplicity.  -- Ian=20

Even if it isnt, I fail to see what good a spare CPU board set will do. 

I know I am in aminority here, but I truely believe the only way to put 
something right is to find the fault, and then to correct that fualt. Not 
to randomly swap parts until the machine _appears_ to work again.

In any case, I don't know anyone who would be prepared to risk any PCB in 
a machine where the health of the PSU isn't known. 

The first thing to do is to discover just what it is and isn't doing. If 
it were my machine I would start by checking the PSU with a meter and 
'scope. PSU problems can make you think there's something wrong with just 
about any part of the machine.

Then I would try reading and writing memory. If that fails. I'd stick in 
a DL11 or something and try reading and writing that (if that works, it's 
_likely_ there's a problem in the memroy section). And look at the Unibus 
lines when doing meoroy accesses from the panel -- do they look right? If 
not, there probably is a problem in the CPU -- then it's time to see 
which signal(s) are wrong, what drives them, could there be a common 
cause, check 'earlier' signals in the CPU logic, and so on.

-tony