> As to what _else_ it is doing, and why it has the cable to the main
> card... I think that it must intercept MSYN from the processor and only
> let it pass if there's no hit in the cache.
> (To explain why it would need to do that... normally with the MS11,
> there's a static
> From: Mattis Lind
> I will take a picture of the boards in more detail so we can figure out
> what they are doing later on.
Thanks, that would be really useful.
> My understanding is that slot 1AB and slot 26 AB is tied to each
> other. So if there would be no expansion
> > The sandwiched dual boards are sitting in 27 / 26 AB. The board in
> 27AB
> > was empty (quick glance), while the board in 26AB has a few TTL chips
> > on it. Slot 26AB is the Unibus A slot, Slot 27 AB should be a
> > terminator on Unibus B.
>
> I'm more interested in _what_
> From: Mattis Lind
> Here is how it is connected:
Thanks for that - very informative!
> The sandwiched dual boards are sitting in 27 / 26 AB. The board in 27AB
> was empty (quick glance), while the board in 26AB has a few TTL chips
> on it. Slot 26AB is the Unibus A slot,
via cctalk <
cctalk@classiccmp.org> wrote:
> -Original Message-
> From: Paul Birkel [mailto:pbir...@gmail.com]
> Sent: Monday, July 23, 2018 2:36 AM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: Strange third party board in PDP-11/45
>
-Original Message-
From: Paul Birkel [mailto:pbir...@gmail.com]
Sent: Monday, July 23, 2018 2:36 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Strange third party board in PDP-11/45
...
>From the ABLE marketing literature:
CACHE/ 45 (CACHE BUFFER MEMORY) INSTA
Message: 1
Date: Sun, 22 Jul 2018 09:22:25 -0400 (EDT)
From: j...@mercury.lcs.mit.edu (Noel Chiappa)
To: cctalk@classiccmp.org
Cc: j...@mercury.lcs.mit.edu
Subject: Re: Strange third party board in PDP-11/45
Message-ID: <20180722132225.49a0b18c...@mercury.lcs.mit.edu>
> From: Pa
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mattis Lind
via cctalk
Sent: Monday, July 23, 2018 2:36 AM
To: Noel Chiappa; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Strange third party board in PDP-11/45
Here is how
>
>
> Studying the MS11 Maint Manual, the MS11 controller has access to the full
> address and data from both the CPU (FastBus) and UNIBUS B. (The FastBus
> actually has two uni-directional data busses; in and out.) So all that
> info,
> this hypothetical cache board can get from the slot it is
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Noel
Chiappa via cctalk
Sent: Sunday, July 22, 2018 2:07 PM
To: cctalk@classiccmp.org
Cc: j...@mercury.lcs.mit.edu
Subject: Re: Strange third party board in PDP-11/45
- MS11-B Engineering Drawings
About
> We're actually pretty well off, there; we have:
> - MS11 Maintenance Manual (DEC-11-HMSAA-D-D)
> - MS11 MOS Memory Troubleshooting Guide (DEC-11-HMSTS-A-D)
> - MS11-B Engineering Drawings
There's also a little bit about the MS11-C (not covered in the documents
above) in
> From: Paul Birkel
> Unfortunately there's not much documentation for the MS11.
??? We're actually pretty well off, there; we have:
- MS11 Maintenance Manual (DEC-11-HMSAA-D-D)
- MS11 MOS Memory Troubleshooting Guide (DEC-11-HMSTS-A-D)
- MS11-B Engineering Drawings
About all we're
21, 2018 6:54 PM
> To: Mattis Lind; General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Strange third party board in PDP-11/45
>
> I think it's Applied Computer Technologies, and I think they made cache
> and several other options. They were popular back in the day
> From: Paul Birkel
> ABLE Computer Technology. Their first product was PN 10001 ... the
> A.C.T. Univerter
This board is not shown in any of the Able brochures we have:
http://bitsavers.trailing-edge.com/pdf/able/brochures/
However, Able info is _very_ thin on the ground, now...
s.trailing-edge.com/pdf/able/Able_Univerter_Nov81.pdf
>
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Bob
> Smith via cctalk
> Sent: Saturday, July 21, 2018 4:44 PM
> To: Mattis Lind; General Discussion: On-Topic and Off-Topic Posts
> Subject: R
ic Posts
Subject: Re: Strange third party board in PDP-11/45
any identification number sn front or back? can tell from just that shot.
On Sat, Jul 21, 2018 at 2:37 PM, Mattis Lind via cctalk
wrote:
> This board was sitting in slot 21 of the backplane in a 11/45
>
> https://i.imgur.com/ZYWZQ
I think it's Applied Computer Technologies, and I think they made cache
and several other options. They were popular back in the day. I have a
bunch of their boards here.
Paul
On Sat, Jul 21, 2018 at 1:37 PM, Mattis Lind via cctalk <
cctalk@classiccmp.org> wrote:
> This board was sitting in
any identification number sn front or back? can tell from just that shot.
On Sat, Jul 21, 2018 at 2:37 PM, Mattis Lind via cctalk
wrote:
> This board was sitting in slot 21 of the backplane in a 11/45
>
> https://i.imgur.com/ZYWZQCo.jpg
>
> What kind of board is this?
>
> It has 26 bipolar
This board was sitting in slot 21 of the backplane in a 11/45
https://i.imgur.com/ZYWZQCo.jpg
What kind of board is this?
It has 26 bipolar RAMS. Fairchild 93415 1kbit SRAM.
The manufacturer might be ACT whatever that is.
My guess is that it is some kind of cache board? It is connected to
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