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 <dersc...@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 <dersc...@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



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