Ok. I might check ...
But is it possible that 2 years of non-use, and never any mechanical
change/adjustment can cause this misalignment?
Further, I never removed the PCB from the metal front, always removed
the whole panel from the chassis (1 screw at each side).
And the buttons all worked a week ago, I could enter any number and
every number button stroke showed in the display ... so, removing the
PCB now is perhaps not the first thing I would do right now.
But I will keep it in mind!
tnx,
- Henk, PA8PDP.
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of John Allain
> Sent: woensdag 9 november 2005 17:00
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: help - 11/34 console problem -- CNTRL key behaviour
>
> > Any input is welcome!
>
> Don't ignore the possibility that the panel is mechanically
> misaligned.
> That is, that the keypad isn't causing the keyswitches to be
> depressed properly. It just takes ~8 phillips head screws to
> find out IIRC. I had two of these panels, one with this
> problem that was realignable.
>
> John A.
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Thank you for your cooperation.
I have made a webpage that shows the progress till now (little).
It has pictures of the signals seen on the logic analyser.
The first part describes the first developments, the last part
is sort-of where I am now ...
see www.pdp-11.nl/pdp11-34a/cpu/options/m7859/troubleshoot.html
Any input is welcome!
- Henk, PA8PDP.
This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law.
If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited.
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Thank you for your cooperation.
> with 768 points per line horizontal resolution (no idea of
> vertical, but as it's for TV type use I expect in the
> region of 500 - 600)
576 for a full frame, 288 per field.
Lee.
..
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A bit more info's arrived on the De Grafe system resold by Bell and
Howell which I mentioned on the list a few weeks back...
The machine's circa 1986 and is a large desktop system, comprising main
unit, small screen, tablet and keyboard. Cost 21,000 pounds when new.
Capable of 4096 colours at 16 transparency levels simultaneously from a
palette of 16M (in 1986!), with 768 points per line horizontal
resolution (no idea of vertical, but as it's for TV type use I expect in
the region of 500 - 600)
Capable of real time digitising from four mixable inputs. Genlock
capability with RGB input and PAL + NTSC output.
It sounds rather awesome - can't wait to get hold of the hardware and
see how it's constructed (I wonder if it's totally custom, or based
around something like an S100 chassis. Whatever, it must have some
serious silicon in there to be able to shunt that much data around at TV
quality)
cheers
Jules
Not to speak for Sellam or Evan, but the East Coast offshoot of the Vintage
Computer Festival is scheduled for Saturday, May 13. Unless something has
changed since the original announcement email, it is supposed to be held at
the InfoAge Learning Center in Wall, N.J.
Take a look at http://www.vintage.org. VCF does indeed have a speaker
program. I would say that the location of the event in NJ and the
"vintageness" of the speaker might make for a nice presentation...but that's
just me.
Rich
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of James Fogg
Sent: Wednesday, November 09, 2005 8:59 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: VCF questions
Sorry for my ignorance -
Who runs the VCF events?
Do they have guest speakers?
I ask because I attended a presentation by Doug McIlroy, an early
computer pioneer with Bell Labs, and Thompson/Ritchie's manager. He's
made significant contributions to both Unix and Multics, among other
things and he has some great stories to tell about the early days and
the development of Unix. His presentation was focused on personal
experiences and the people he's known, but I believe he can also get
very technical (he is currently an adjunct professor at Dartmouth).
After the presentation I spoke for a time with Doug. He was amazed that
there exists a community interested in the preservation and restoration
of old computers and their software. I explained a few things about the
community and some of their projects and he was interested in the idea
of the VCF. He said he'd consider an opportunity to speak at the VCF or
similar venues in the North East and Mid Atlantic regions.
Would there be an interest in having Doug present, does the VCF have
space in their program for speakers?
Some info on Doug -
http://www.cs.dartmouth.edu/~doug/biographyhttp://en.wikipedia.org/wiki/Doug_McIlroyhttp://www.cs.dartmouth.edu/~doug/
-James
>
>Subject: Re: Vax 4000 on VCM needs rescue in Philly
> From: Sridhar Ayengar <ploopster at gmail.com>
> Date: Wed, 09 Nov 2005 08:29:59 -0500
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Curt @ Atari Museum wrote:
>> If anyone wants to chip in, I'd be willing to hire NA Vanlines to pickup
>> and transport the equipment here to my in Putnam, NY. I would love a
>> spare 4K and if anyone would be interested in some of the RA80's we
>> could definitely work something out. Let me know.
>
>I didn't know you were in Putnam. Whereabouts?
>
>I'm in Poughkeepsie.
>
Good grief! I'd been in the Putum and Patterson area a couple of times
this year to visit friends. It's only 3 hours from here.
Allison
>
>Subject: Re: Nicolet 4094 Digtial Storage Scope?
> From: "Joe R." <rigdonj at cfl.rr.com>
> Date: Wed, 09 Nov 2005 08:31:14 +0000
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>At 10:29 AM 11/8/05 -0800, Dwight wrote:
>>>From: "Joe R." <rigdonj at cfl.rr.com>
> FWIW I also found message on the net that indicatd that the probes for
>these need more capacitance compensation than most probes provide so a
>"standard" set of probes may not work perfectly on it. Some brands of
>probes and some older Tektronix probes do have adaquete adjustment and do
>work fine. Right now I'm using a set of probes from one of my other scopes
>and I don't want to mess with their adjustment so I'm just putting up with
>the distortion. I'll find an extra set of probes and try to adjust them and
>dedicate them to this scope.
>
> Joe
Probe compensation is a trivial thing and it's nominally done whenever
a probe is used with a scope when it's use was unknown. The range of
adjustment is usually enough that any proble works with any scope.
I've only had rare problems with this and usually with elcheapo probes.
Some probes have higher capacitance for example 1x and long cable 10x
probes. It's not a bad thing only something to be aware of as SOME
circuits and measurements are sensitive to the capacitance and results
may vary. Usually it's very high impedence or fast HF designs that are
most likely to show this.
Allison
>
>Subject: Re: FPGA VAX update, now DIY TTL computers
> From: 9000 VAX <vax9000 at gmail.com>
> Date: Wed, 09 Nov 2005 00:35:00 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 11/8/05, Chuck Guzis <cclist at sydex.com> wrote:
>> On 11/8/2005 at 5:36 PM woodelf wrote:
>>
>> > Well everybody likes 12 bits...
>> > http://www.cray-cyber.org/hardware/Hardware.php
>> > Forget TTL, go tubes!
>>
>> Wow, now that's ambitious!
>>
>> Makes me wonder, though. Around the time the transistor was in its
>> ascendancy, the vacuum-tube business came up with a couple of innovations.
>> One was the nuvistor--an almost transistor-sized tube; and the other was a
>> low-voltage tube used in automobile receivers that were specified for 12.6
>> volts on the plate (e.g. 12AE7 dual triode). These would be coupled with a
>> solid-state driver and power amplifier for a auto radio with no vibrator
>> supply.
>>
>> The first would seem to make the scale of a digital computer more
>> attractive; the second would seem to substantially reduce the power
>> requirements. To anyone's knowledge were either of these two components
>> ever used in digital applications?
>
>It is funny that I am a tube fan too.
>
>The 12.6 volt tubes won't save you any power; On the contrary, they
>sucks much more power than normal tubes. Because they need a lot of
>current to heat the cathode to emit more electrons; and they have a
>positive first grill to 'pull' electrons out from cathode.
Space charge tubes llike 12AD6, 12ek6 for automobile radio service.
I've run common tubes like 6u8 and 12at7 at 12V on the pate with good
results.
>Nuvistors are not good to use for homebrew computers either, because
>they are expensive. Months ago I saw a board with 10+ nuvistors. I
>didn't buy it ($9.99) because I was not small-tube fan. I checked the
>second hand price at that time and it was significantly higher than
>those sub $1 tubes.
Nuvisters were ceramic metal tubes developed for VHF and UHF recieving.
They are mostly triode designs though there were tetrodes. I have a
reciever I built that uses one for the RF amp and another in an osc.
Small, lower noise but there are glass tubes that are similar.
Allison
"Don S." is Don Senzig, one of the founding
members of the Wisconsin Computer Society,
which had its first meeting on a cold Saturday
afternoon in January, 1976. AFAIK, there are
still monthly meetings, though it is down to
a dozen or so folks that have known each other
now for over thirty years. I try to make it
to them when I'm out there.
Don was a close friend, and is missed.
He and Dorothy hosted the meetings at their
house for many, many years.
>From: "Joe R." <rigdonj at cfl.rr.com>
>
> I went scrounging again last weekend and came home with this. It looks
>like this one from an old Ebay auction.
><http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7530644273>.
>It has two HH floppy drives and it is DIGITAL storage so it's somewhat on
>topic. Does anyone know anything about these? I've figured out some
>controls but I don't have a clue what others do. I'm also trying to figure
>out how to use the disk storage and recall function. I inserted a 360k
>MS-DOS disk and it displays E7 and it also says ERR if I try to store or
>recall anything so I don't think it likes that format and it doesn't seem
>to be capable of formatting it's own disks. Does anyone have any idea what
>format it's looking for?
>
> Joe
>
>
Hi Joe
I've thought about getting one of those. They usually
go cheap on ebay.
One possible guess is that they use hard
sectored disk. I doubt they use any specific OS. If you
have a program that has access to the controller chip on
your PC, you might try formatting different sector sizes.
Of course, it might actually use FM or MFM. It might even
be 1.2M. Have you looked at the drives to see what they
are intented for?
Dwight
