This is aimed at whom?
Allison
>
>Subject: Motorola 6800D2
> From: "Chuck Patten" <chuck.patten at verizon.net>
> Date: Wed, 10 Aug 2005 22:05:00 -0700
> To: <cctalk at classiccmp.org>
>
>Noticed you had collected one from an old thread. Are you interested in
>parting with it?
>
>
>
>cheers,
>
>chuck.
>
>
Hi,
Is there a more interesting book on early computers? I
doubt it.
Who was it that was selling these here a while back?
Send me a couple more copies please.
Thanks!
Steve.
____________________________________________________
Start your day with Yahoo! - make it your home page
http://www.yahoo.com/r/hs
I'd like to solicit volunteers to help with gating posts from cctalk to
cctech. Ideally, people in a drastically different time zone than central US
:)
Gating posts takes about 5-15 minutes per day, all depends on how many
people are doing it. You basically log in to a website for cctech and click
on "accept" if the post is 100% on-topic, or reject if it's not. You then
log in to a website for cctalk and click "accept" if it's ok (non-list
member post) or "reject" if its one of the few spam that makes it by the
filters.
When this is done consistently, the list runs smooth and it's very quick &
easy to do. When it's not run consistently, it can become a royal pain and
consume a lot of time.
Doing this gating used to be a very time consuming thing, but since I've
made some changes to the mail stream it's not quite quick and easy - as long
as it's kept up with.
I - and the people on cctech, would greatly appreciate it if a reliable
individual with 5 to 15 minutes per day to spare can help out!
Jay West
Dear Classiccmp Community,
I have a Grinnell GMR-270 frame buffer for a PDP-11 to give away. It was
given to me as working, but I cannot test it since I do not currently have
a working PDP-11 system. It provides color 512x512 output to a monitor,
which a included. Also included is the original documentation, which
includes technical data and programming information. It seems that it can
also act as a frame grabber. It has hardware pan/zoom functionality. It
is a regular 19" rack unit, approximately a cube, and weighs around 40
pounds.
I am in New York City. If you want it, come and get it.
thanks, -kurt
Hi Guys,
I'm really getting fed-up with the limitations of the PC floppy disk
controller.
Here's another idea I've had on the back-burner for quite some time, I've
mentioned to a couple of you during private correspondance, but here it is
for open discussion.
The idea is to make a small single-board computer with a microcontroller,
a WD2793 or similar floppy disk controller, enough memory to buffer a
few tracks, and a high-speed serial port for communication with the PC.
The board would have connectors for 5.25"/3" drives and 8" drives, and
would properly interface to all drive types.
Firmware would be developed to provide read/format/write/analysis
capabilities around the more powerful WD chip. Images would be transferred
via the serial connection to and from the PC. This should allow us to
archive soft-sector formats that are not compatible with the PC, and also
to perform these functions under virtually any PC environment.
I just haven't had time to design and build the board ... anyone else
interested in working together on such a project?
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html
Hi
I was going to correct that spelling but
I got distracted by work. I just sent it without
doing so. In any case, things like Jell-O are
bad to wake in.
Dwight
>From: "Ade Vickers" <javickers at solutionengineers.com>
>
>Dwight K. Elvey wrote:
>
>>From: "Joe R." <rigdonj at cfl.rr.com>
>>>
>>> LOL! Anybody need an HP >>TERMINAL<<?
>>><http://cgi.ebay.com/1979-HP-Collectors-Dream-2649A-model-computer_W0QQ
>>>itemZ
>>>5230070472QQcategoryZ4193QQrdZ1QQcmdZViewItem>
>>>
>>> Joe
>>>
>>>
>>
>>Hi
>> I'm dreaming but just as I reach for the keyboard, I wake up in a cold
>sweet. What does that mean?
>
>It means that either:
>
>A) the custard went cold while you were asleep. Microwave the sweet until
>warm, then consume
>B) Your sweet is supposed to be cold. Eat & enjoy. Don't fall asleep in it,
>as it will spoil the texture.
>
>
>HTH,
>Ade.
>
>
>PS: Ironically, I *do* need an HP terminal.... To get my A700 running!
>Unfortunately, being 3000 miles the wrong side of a big lump of water kind
>of prevents me from bidding for the "dream computer" of the subject...
>
>--
>No virus found in this outgoing message.
>Checked by AVG Anti-Virus.
>Version: 7.0.338 / Virus Database: 267.10.9/72 - Release Date: 14/08/2005
>
>
>
>
>From: "Joe R." <rigdonj at cfl.rr.com>
>
>At 03:51 PM 8/12/05 -0600, you wrote:
>>On 8/12/05, Brad Parker <brad at heeltoe.com> wrote:
>>> Is there a list of the various pdp-11 unibus backplanes anywhere?
>>
>>I do not know of a master list online.
>>
>>> My 11/44 has a DD11-DF in it which is impossible to get cards into and
>>> out of. It's like something is physcally wrong with it. Rather than
>>> damage any cards I thought I'd replace it.
>>
>>It takes a bit of force to get hex cards in a nearly-unused backplane.
>> I've bent latches trying to get boards in.
>
> I've had similar trouble with the HP 1000 boards. I found that if I
>clean the edge connectors and them wipe them with a rag slightly dampened
>with WD-40 (mostly kerosene, a light oil) that the cards go in and out much
>easier and I have a lot less intermitant contacts. I believe the oil
>coating also helps reduce oxidation of the contacts.
>
> Joe
Hi
From what I've been told, WD-40 contains both silicon and
petrolium oils. I prefer using silicon grease for this purpose.
Past experiments with petrolium oil and grease showed that the
contact resistance increased on clean contacts while the
silicon grease showed a significant drop in resistance.
I recommend Dow-Cornings, DC-4.
Dwight
>From: "Joe R." <rigdonj at cfl.rr.com>
>
>At 02:31 PM 8/15/05 -0700, Dwight wrote:
>>>From: "Joe R." <rigdonj at cfl.rr.com>
>>>
>>>At 03:51 PM 8/12/05 -0600, you wrote:
>>>>On 8/12/05, Brad Parker <brad at heeltoe.com> wrote:
>>>>> Is there a list of the various pdp-11 unibus backplanes anywhere?
>>>>
>>>>I do not know of a master list online.
>>>>
>>>>> My 11/44 has a DD11-DF in it which is impossible to get cards into and
>>>>> out of. It's like something is physcally wrong with it. Rather than
>>>>> damage any cards I thought I'd replace it.
>>>>
>>>>It takes a bit of force to get hex cards in a nearly-unused backplane.
>>>> I've bent latches trying to get boards in.
>>>
>>> I've had similar trouble with the HP 1000 boards. I found that if I
>>>clean the edge connectors and them wipe them with a rag slightly dampened
>>>with WD-40 (mostly kerosene, a light oil) that the cards go in and out much
>>>easier and I have a lot less intermitant contacts. I believe the oil
>>>coating also helps reduce oxidation of the contacts.
>>>
>>> Joe
>>
>>Hi
>> From what I've been told, WD-40 contains both silicon and
>>petrolium oils. I prefer using silicon grease for this purpose.
>>Past experiments with petrolium oil and grease showed that the
>>contact resistance increased on clean contacts while the
>>silicon grease showed a significant drop in resistance.
>> I recommend Dow-Cornings, DC-4.
>
> Does DC-4 lower the force required to insert and remove the board? Where
>can you get it? Any idea how much WD-40 increases the contact resistance?
>Even if it does increase the resistance it has cured many of problems that
>I've had with the 1000s so it seems to do more good than harm.
>
> Joe
Hi Joe
Most any electrical supply shop has it or can get it.
McMaster-Carr list it as well.
The measurements were done with petrolium grease but
I forget which one. We'd see a normal 10 milli-ohm contact
go as high as 20-30 milli-ohms. The silicon grease would
usually take a 10 milli-ohm dry contact and reduce it to around
2.5 milli-ohms ( close to our measurement limit, using a
4 point DVM ). These were typical gold-gold edge connectors.
It does reduce the force required but not as much as the
petrolium grease did. I'd suspect that it might be similar
to the wd40, being a lighter oil.
Dwight
> > Just curious...has there ever been a device available to anyone's
> > knowledge that functions like an analog phone line and
> allows transmission via TCPIP?
Get an old phone system with analog station cards (for POTS phones) and
stick a system with a modem on one extension with it set to autoanswer
and call it with a modem from another extension.
I just got a HP 1610 Logic Analyzer and although its in good shape
the monitor is clearly very dead.
I did notice that on the bottom there are several DB25 ports, is it
perhaps possible to hook up a terminal or something to it and control
it from there or something ? I think its a long shot but you never now.
Thanks!
Stefan.
-------------------------------------------------------
http://www.oldcomputercollection.com
