11/45 hack?

Paul Anderson useddec at gmail.com
Sun Feb 8 03:16:45 CST 2015

Hi Jake,

The 3 core sets, accordind to your earlier post are the G110, G231, and
H214. these are 8kw each. Maybe the Monilithic will work and that might max
you out.

Think of the bipolar as very fast extra memory. It can sort of act like a
cache memory, and can help with processor throughput. I thought there were
2 controller boards and 4 G401s, but one is better than none. You can check
that on the top of the processor box in the module chart.


On Sun, Feb 8, 2015 at 12:41 AM, Jacob Ritorto <jacob.ritorto at gmail.com>

> On Sun, Feb 8, 2015 at 12:46 AM, Paul Anderson <useddec at gmail.com> wrote:
> > I'm pretty sure it's not.
> >
> > Do you only have one G401?  strange...
> >
>   no, no, I have currently one mos/bipolar controller running one bipolar
> memory board on the main 11/45 backplane.  Sexy but expensive and not
> nearly enough to get stuff done in unix.  Then I have three 4KW core sets,
> each on its own backplane with controller.  Very neat but very
> space-consuming!
>   I've decided that I'm probably going to remove the bipolar and core and
> replace it with a plain old 124KW M7891 MS11.  Freeing up that space the
> core is currently taking will allow me to install a plain dd11 backplane
> for the other features I need.  Things like SMD big disk controller,
> ethernet, dz11 terminal board, 124KW memory, etc. without having to go to
> aother cabinet.  These all require MUD/SPC slots and I have *none*
> currently.  So the core goes.  So sad.  I have a number of other pdp11s, so
> it'll find a good use.  Unless someone out there wants to do a little
> horse-trading!.
>   But anyway, I'm getting waay ahead of myself here because I haven't even
> been through the power yet.  Boards are all out and I'm enlisting the help
> of my ee buddies to try to repair my H745s on Monday, so I'll play with the
> good old 11/34 until then!
> Thanks for the interest & comments!
> --jake

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