PDP-11/05 core questions

[Paul Anderson]

The Unibus trouble shooting handbook describes 4 or so 11/05 backplanes.
Mine is still packed away.

The 8K and 16K are not interchangable. I have seen systems where the
backplane has been changed, so I would check the part number first.

Paul

On Wed, Mar 19, 2008 at 11:05 PM, Dave McGuire <mcguire at neurotica.com>
wrote:

>
>   Ok, I decided to dive into the PDP-11/05 a bit tonight.  First I'm
> trying to make sure I have all the right boards for when the time
> comes to assemble the system.  I have the two CPU boards (M7260 and
> M7261, actually three of the latter!), the M9970A SCL connector
> board, and two M930 terminators...so now I need some memory.
>
>   The stamped silver tag on the side of the chassis says "11/05 SC"
> which I assume means it's got an 11/05S backplane in it.  This
> assumption is supported by the board location sticker inside the card
> cage, which is labeled for a 16K core subsystem (H217, G114, G235,
> M8293).
>
>   The problem is, I don't have that core subsystem...I have enough
> boards (in multiple copies) to put together an 8K subsystem, using
> H214 (or H215?), G213, and G110 boards.  My question is, will this
> subsystem function in this backplane, or is the 11/05S backplane only
> compatible with the higher-density core subsystem?
>
>   There's one other problem...The circuit breaker on the rear of the
> chassis is physically damaged.  Does anyone have a spare one kicking
> around, or know of a currently-available replacement that I can order
> from a component distributor?
>
>               Thanks,
>               -Dave
>
> --
> Dave McGuire
> Port Charlotte, FL
>
>
>