DDS SETASI SC44 info?

[Josh Dersch]

On 9/24/15 9:58 AM, Sean Caron wrote:
> Nice score; the system looks pretty loaded!
Thanks!  It is pretty nice.  Just need to get a mass storage controller 
of some kind and it'll make a nice system.

> I checked out the pictures and
> I believe the "SC44" board is indeed simply a cache memory ... no VLSI or
> bit-slices on there to imply any compute capability. The "1501" board is
> just a little stub with a few bus driver ICs on it; looks like they are
> running lines from the private interconnect ribbon cable, back to the
> Unibus.
Yeah, that's about what I figured from looking at it, just curious if 
anyone had docs secreted away just in case I need to service it or if I 
ever want to know what those dip switches are for :).

Definitely going to have to see what performance difference the SC44 
makes over a normal /44; there's one at work I've been using so I'll 
have to craft up some benchmarks once I get mine running...

Thanks,
Josh


>
> Best,
>
> Sean
>
>
>
>
> On Thu, Sep 24, 2015 at 3:02 AM, Josh Dersch <derschjo at gmail.com> wrote:
>
>> On 9/23/15 2:52 PM, Sean Caron wrote:
>>
>>> Any easy way to post pics of the top side of both boards? I can't
>>> definitively ID them but we should be able to make a good guess as to
>>> what's actually on there looking at all the major ICs...
>>>
>> Yeah, I took some pictures this afternoon (a bit blurry -- it was dark and
>> all I had was my cell phone, I'll try to get better pics tomorrow):
>>
>> http://yahozna.dyndns.org/scratch/sc44/
>>
>>
>>> Did you just buy this? :O
>>>
>>> http://vintagetech.com/sales/Big%20Iron/PDP%2011-44/Information
>>>
>> Yep :).
>>
>> - Josh
>>
>>
>>
>>
>>> Best,
>>>
>>> Sean
>>>
>>>
>>> On Wed, Sep 23, 2015 at 5:40 PM, Josh Dersch <derschjo at gmail.com> wrote:
>>>
>>> Hi all --
>>>> I just added a PDP-11/44 to my collection and it appears to have some
>>>> manner of cache upgrade; it's made by Digital Data Systems (DDS) and
>>>> consists of two cards, one hex-height labeled "SC44 SETASI" (in the place
>>>> of the normal 11/44 cache board) and a second quad-height labeled "1051"
>>>> at
>>>> the end of the first backplane.  The two are connected via a ribbon
>>>> cable.
>>>>
>>>> I know DDS made some seriously nice upgrades for the 11/70 but I can't
>>>> find
>>>> anything on this board set at all.  I'm assuming it's just a souped-up
>>>> cache but it'd be nice to know more (and docs would be excellent of
>>>> course).
>>>>
>>>> Thanks,
>>>> Josh
>>>>
>>>>