>
> So, my guess was wrong there. I had _assumed_ that when doing a memory
> operation, the CPU started a cycle on both busses, to minimize the delay on
> the UNIBUS cycle if the MS11 on the FastBus didn't have that location. (I
> had
> previously checked, and there is an 'I have that location' sig
> 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 un
> > 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_ the
> 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, S
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 it is
>
>
> 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 plu
-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 EK-11045-
> 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 miss
> 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...
savers.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
> Subje
f-Topic 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/
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 slo
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 RAMS.
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