On Tue, 25 Oct 2016, Guy Sotomayor Jr wrote:
OK, re-reading the first part of section 5.2.5, it?s pretty clear that the
Unibus is 120-ohm:
A bus terminator is defined as a Unibus element or part of an element containing
a resistive network which connects to the end of a Unibus segment and matche
On 10/25/2016 04:24 PM, Guy Sotomayor Jr wrote:
>> On Oct 25, 2016, at 12:40 PM, allison wrote:
>>> Also, I think in a previous email you mentioned that the UNIBUS is 240ohm.
>>> It’s not.
>>> It’s 120ohm.
>> My book says no. Qbus is for sure 120.
>>
> Section 5.2.5 of the PDP-11 UNIBUS spec:
>
> From: Guy Sotomayor
> Secondary chip marke[t] (only reputable vendors).
I'm a little more willing than Guy to troll in disreputable waters (I bought
1K DS8641's from a source in Hong Kong), so I have this:
http://ana-3.lcs.mit.edu/~jnc/tech/QSIC/TestCardF.jpg
which has a bunch of s
On 10/26/16 7:38 AM, Noel Chiappa wrote:
> From: Guy Sotomayor
> Secondary chip marke[t] (only reputable vendors).
I'm a little more willing than Guy to troll in disreputable waters (I bought
1K DS8641's from a source in Hong Kong), so I have this:
http://ana-3.lcs.mit.edu/~jnc/te
> From: allison
> What vendor
I don't recall, would have to look it up; I turned Guy onto them, and he
bought out everything they in stock.
> They have been scarce save though resellers that have NOS parts from
> old stocks and they are not cheap and unpredictable quantities.
Ye
> On Oct 26, 2016, at 9:07 AM, Noel Chiappa wrote:
>
>> ...
>
> So that figure I was given of 30K in stock is probably not from that one
> vendor, but across all of them. But since nobody is using these chips in a
> product (that I know of), I suspect the number is likely to go down only
> slow
> From: Paul Koning
> The trouble with chip resellers is that it's hard to know which ones are
> legit, and which ones are in the fake chip business.
I suspect that the network of major resellers would tend to keep out the
riff-raff. (They don't need the aggro of dealing with the cons
Hi,
On 10/25/2016 10:49 PM, Guy Sotomayor Jr wrote:
Secondary chip marked (only reputable vendors). I currently have ~2500 8641
and several 100’s of the other variants. Assuming 100% good parts, I have
enough stock to build at least 100 unibus boards (total) of various types that I
have planne
> On Oct 26, 2016, at 7:02 AM, Philipp Hachtmann wrote:
>
> Hi,
>
> On 10/25/2016 10:49 PM, Guy Sotomayor Jr wrote:
>> Secondary chip marked (only reputable vendors). I currently have ~2500 8641
>> and several 100’s of the other variants. Assuming 100% good parts, I have
>> enough stock to bu
On 26 October 2016 at 10:02, Philipp Hachtmann wrote:
> BTW Why isn't there a separate list "ccbusinterfacechip" where those
> recurring 8881 discussions can be separated from the more interesting stuff?
>
The discussion is enlightening. It would be nice, however, to
summarize the various conclusi
> On Oct 26, 2016, at 9:18 AM, Christian Gauger-Cosgrove
> wrote:
>
> On 26 October 2016 at 10:02, Philipp Hachtmann wrote:
>> BTW Why isn't there a separate list "ccbusinterfacechip" where those
>> recurring 8881 discussions can be separated from the more interesting stuff?
>>
> The discussi
> On Oct 25, 2016, at 12:59, Terry Stewart wrote:
> Lovely. I'm sure the sloping wood-(veener) sided case design of the Dick
> Smith System 80 was inspired by the SOL.
>
> http://www.classic-computers.org.nz/system-80/hardware_s80-mk1-front-800.jpg
Oh yes, the styling is clearly very similar.
> From: Philipp Hachtmann
> Very enlightening.
> You're hoarding interface ICs with commercial second thoughts
If you think either Guy, or Dave and I, expect to make much money selling the
QBUS/UNIBUS boards we are working on, you are seriously confused. None of us
are in this as a mo
Guy S.
Thanks saved me the time to say exactly what you said. For all those that
thing designing a driver is a simple thing to do, make your self a
simulated Unibus that is 50 feet long, add around 30 'stubs' load it down
to the max and show me your 'easy to build' drivers signal quality.
On Mon
On 10/26/16 7:38 AM, Noel Chiappa wrote:
But DS8641's are available in the 10's of thousands, there's no earthly way
we could use them all on repairs. Yes, when they run out, we'll have a
problem - but I plan to cross than bridge _if_ and when we get to it.
Noel
Actually since about
> The trouble with chip resellers is that it's hard to know which ones are leg$
And then there are the periodic mentions of supposed chip vendors who
ask you what package and what pin count when you ask them for a part
that has never existed except in one version.
/~\ The ASCII
Re: DEC bus transceivers
> From: allison
> Actually since about 1987 I've used about 1200 pieces of the 8641 alone
> repairing boards at the commercial level.
Well, that's over almost 30 years - and your total from that period is about
4% of the remaining stock (and in a commercial op
I have not had good luck with the RuGRiD list. I am aware of it.
There are only a small handful of people there with Compass gear; It is
mostly centered around the later PC-compatible GRiD stuff.
There is one fellow with quite a lot of Compass media who has reached out
to me a couple times, but I
On Wed, Oct 26, 2016 at 1:32 PM, Ian Finder wrote:
> I have not had good luck with the RuGRiD list. I am aware of it.
>
> There are only a small handful of people there with Compass gear; It is
> mostly centered around the later PC-compatible GRiD stuff.
>
>
Jut for the record, I took a look, I h
>
> >Oh yes, the styling is clearly very similar. I like the built-in tape
> drive. Do you think that was likely inspired by the Commodore Pet?
>
It could have been. I think EACA were looking at something people could
just pick up, take home and use without extra cables and "other bits".
This is
Hi Ian,
This is a little pricey but this came up on Craigslist recently.
http://boston.craigslist.org/sob/sys/5839406174.html
Looks to be lots of documentation but I don't know the seller nor am I even
close by. Maybe a group buy might net the manuals/software. I'd be in for
the Compass 1109 b
I picked up an Informer 213 from eBay this week, but it has the IBM rom
set! Noo!
Anyone out there with the VT100 version willing to dump the roms for me?
Thanks,
- Ian
--
Ian Finder
(206) 395-MIPS
ian.fin...@gmail.com
I don't see these manuals online at either bitsavers.org or hpmuseum.net.
Does anyone have copies of them available?
12044-90001 HDLC Direct Connect Interface Hardware Reference Manual
(12044A for A/L-Series)
12825-90001 HDLC Direct Connect Interface Hardware Reference Manual
(12825A for M/E/F-S
I already bought the 1109 and most of the docs :)
It's what prompted my post here.
The docs are great, but there is not much software.
The seller is a good guy, very easy to work with- did a great job letting
me know what's there and what's not.
I passed on any docs I have dupes of.
On Wed, Oct 2
I've got this. will see about getting it on line
On 10/26/16 6:58 PM, Glen Slick wrote:
> 12044-90001 HDLC Direct Connect Interface Hardware Reference Manual
> (12044A for A/L-Series)
>
I scanned my copy of the Hitachi 303 manual a few weeks ago. For anyone
interested in downloading it, I uploaded it here:
https://drive.google.com/open?id=0B8Ow1Wo1rBQUSVdXQU84SWtVRFU
Didn't see it on Bitsavers yet, so I thought I would share.
Thanks,
Kyle
Mighty right of you, Kyle.. thanks!
On Wed, Oct 26, 2016 at 10:13 PM, Kyle Owen wrote:
> I scanned my copy of the Hitachi 303 manual a few weeks ago. For anyone
> interested in downloading it, I uploaded it here:
> https://drive.google.com/open?id=0B8Ow1Wo1rBQUSVdXQU84SWtVRFU
>
> Didn't see it o
I'm interested too, I have the interfaces.
Marc
> On Oct 26, 2016, at 6:58 PM, Glen Slick wrote:
>
> I don't see these manuals online at either bitsavers.org or hpmuseum.net.
>
> Does anyone have copies of them available?
>
> 12044-90001 HDLC Direct Connect Interface Hardware Reference Manual
On 10/26/16 10:54 AM, Noel Chiappa wrote:
> From: Philipp Hachtmann
> Very enlightening.
> You're hoarding interface ICs with commercial second thoughts
If you think either Guy, or Dave and I, expect to make much money selling the
QBUS/UNIBUS boards we are working on, you are ser
On 10/26/2016 12:40 PM, Noel Chiappa wrote:
> Re: DEC bus transceivers
> > From: allison
>
> > Actually since about 1987 I've used about 1200 pieces of the 8641 alone
> > repairing boards at the commercial level.
>
> Well, that's over almost 30 years - and your total from that period is
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