1 Dec
2007
1 Dec
'07
12:46 p.m.
Item # 320190208819
They look too small to be Qbus and the module numbers are all 3
digits, whereas all the Qbus and UNIBUS module board numbers I've seen
had 4 digits.
This looks like a good deal for someone looking for spare flip-chip
modules or maybe someone who wants to reverse engineer this pile of
flip-chip modules and wire-wrapped backplane to figure out what it
used to do :-)
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1 Dec
1 Dec
1:01 p.m.
Richard wrote:
Item # 320190208819
They look too small to be Qbus and the module numbers are all 3
digits, whereas all the Qbus and UNIBUS module board numbers I've seen
had 4 digits.
this looks like an I/O module from the vintage of pdp 8/I or earlier
8's. the poster put in Qbus
to get more Dec types to hit the auction, rather than having any idea
what the unit actually did.
Note that the unit probably had all the modules pulled and they look
like they were put
back in sorted for pretty color rather than where they need to be. So
w/o drawings this
is a nice backplane and a lot of boards.
Jim
4:56 p.m.
Apologies if this appears twice -- Replies to mail from cctalk seem to
vanish into thin air.
From: "jim s"
Richard wrote:
I'd go a step further -- many of those modules were never part of the
RS08 that the backplane implies. I'm quite sure there were no Mxxx
modules in an RS08. The Gxxx are right, as are the Bxxx. I don't
know what an S200 is, and I don't see one in the RS08 documentation
(maybe it's an S206?).
My theory is someone used it for a while as a convenient place to
store some Mxxx spares from a PDP-8/I.
Here's the RS08 module list from table 5-2 (on page 5-2 of DEC-08-HIEA-D,
aka RF08_PrelimMaintMan.pdf):
B133x2
B134
B135
B137
B152x3
B165x2
B172
B212x2
B301x3
B312
B611
B683x2
G085x4
G284
G285x4
G286x4
R002
R302
R111
R302
R303
S206
Vince
Item # 320190208819
Note that the unit probably had all the modules pulled and they look
like they were put
back in sorted for pretty color rather than where they need to be. So
w/o drawings this
is a nice backplane and a lot of boards. 
1:01 p.m.
On Sat, Dec 01, 2007 at 10:46:18AM -0700, Richard wrote:
Item # 320190208819
They look too small to be Qbus and the module numbers are all 3
digits, whereas all the Qbus and UNIBUS module board numbers I've seen
had 4 digits.
You have probably only seen later stuff - have a look at a pre-1978
backplane-sized peripheral - the M105 is a Unibus Address Selector (from
memory - it's at least part of older, multi-board, Unibus peripherals).
These cards look like pretty much ordinary FLIP-CHIP modules, which
were used to make a variety of CPUs and periperals in the 1960s and
1970s. I don't recall any Qbus stuff made up of these, but there was
plenty of Unibus (PDP-11) and pre-OMNIBUS (PDP-8) stuff, chock full
of these and similar cards.
This looks like a good deal for someone looking for
spare flip-chip
modules or maybe someone who wants to reverse engineer this pile of
flip-chip modules and wire-wrapped backplane to figure out what it
used to do :-)
The seller shows a photo of the nameplate which *says* what it used
to do - it's an RS08 backplane. The RF08/RS08 is a fixed-head disk
for the PDP-8. The RF08 was the master, the RS08(s) was/were the
slave disks. Obviously, this doesn't include a drive mechanism,
nor the smart part of the RF08, but it's still an interesting piece.
-ethan
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