DecServer 550 chassis

jwsmobile jws at
Mon Oct 19 11:28:48 CDT 2015

I would appreciate thoughts on the conversion of the processor to normal 
PDP11 eproms.

The page pointed to earlier has a mention of that too, but the poster 
had access to another "real" KDJ and I am guessing copied that.

I don't have access to any version of the system with appropriate eproms 
and would appreciate any pointers to the binaries needed.

As to the condition most of the material is the result of moving it from 
where it was stored.  It will be totally disassembled and tested before 
being brought back up.  There is about 5 or 6 large deep freeze (for 
reference) sized piles of material being sent for e-waste from the place 
that is pretty much just junk material under the weather.

Think of this as a Dusenberg rescued from a barn though.

thanks for all the suggestions and observations.

Next thing to go over is a Sun 4/260 "mini" tower.  Gads those were 
heavy.  Back is still aching from moving that.


On 10/19/2015 7:32 AM, Ethan Dicks wrote:
> On Mon, Oct 19, 2015 at 3:42 AM, Pontus Pihlgren <pontus at> wrote:
>> Interesting. I thought Tthe DECserver 550 was merely the big brother in
>> the terminal server line. But it looks like it is essentially a
>> PDP-11/53 with 1.5MW of ram, you need new boot roms though. Pretty nice.
> Yep.  It's essentially an S-box KDJ11 with different ROMs.  I happen
> to have a CPU board from one, but not the box itself.
> One of these days, I plan to burn "real" PDP-11 ROMs and bring 2.11BSD
> up on mine.  That and my Pro380 are my only KDJ11 machines.
> -ethan

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