Much swearing - was Re: Do-It-Yourself PDP-11 help!

Gordon JC Pearce gordon at gjcp.net
Wed Feb 16 11:52:57 CST 2005


Vintage Computer Festival wrote:
> On Wed, 16 Feb 2005, Gordon JC Pearce wrote:
> 
> 
>>On closer inspection, the termination resistor pack beside the "B"
>>connector on my KDJ11-A is cracked.  How critical are the termination
>>resistors, and what value resistor pack do I need?
> 
> 
> Not entirely as I've learned, though they might be in your case.  Also,
> there might be an imbalance in the bus because some signals are not being
> terminated?  I'm speaking entirely out of ignorance here, so smite me if
> I'm wrong.
> 
> You might try patching the cracked resistor pack somehow, perhaps
> bypassing it with the appropriately valued resistor.
> 


OK, I've replaced the cracked resistor pack.  I used 270 ohm resistors 
rather than the 240 ohm that the pack measured out at, but I can't see 
that making a difference.

Still got the same problem.  So - either I've got a gubbed console card 
or I've got a gubbed KDJ11-A.

Anyone got any cards they are willing to sell or swap?

Gordon.




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