24 Sep
2015
24 Sep
'15
10:27 p.m.
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
>>>
>>>