I think I may need to get a small part 3d printed (some plastic board
mounting guide rails from a PDP 11/24 H7140 PSU). What software is best for
a novice? Preferably free!
Thanks
Rob
Hello Rob,
FreeCAD is nice for modeling 3D shapes.
For 3D printing, depending on the technology of 3D printer, you need to process original model to convert compact sections into hollow honeycomb structure, and add small plastic bars into empty volumes to support the model while it's printed.
I'm not expert of this latter procedure and tools.
Andrea
Aug 23, 2021 19:07:55 cctech-request at classiccmp.org:
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> Today's Topics:
>
> ?? 1. Tektronix XpressWare 8.1 (Cameron Kaiser)
> ?? 2. Re: Tektronix XpressWare 8.1 (Doc Shipley)
> ?? 3. Re: Ultrix-11 (Peter Allan)
> ?? 4. Need Spectravideo SVI-328 parts.... (geneb)
> ?? 5. 3d modelling software (Rob Jarratt)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 22 Aug 2021 17:16:49 -0700 (PDT)
> From: Cameron Kaiser <spectre at floodgap.com>
> To: cctalk at classiccmp.org
> Cc: Cameron Kaiser <spectre at floodgap.com>
> Subject: Tektronix XpressWare 8.1
> Message-ID: <202108230016.17N0Gn3c16973864 at floodgap.com>
> Content-Type: text/plain; charset=US-ASCII
>
> Bitsavers has 6.3 (thank you Al) but I'm trying to push my luck and find
> 8.1 for this XP421CH Xterm. Anyone know of where it can be found?
>
> --
> ------------------------------------ personal: http://www.cameronkaiser.com/ --
> ? Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
> -- FOOLS! I WILL DESTROY YOU ALL! ASK ME HOW! -- "Girl Genius" 8/29/07 --------
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 22 Aug 2021 21:08:21 -0500
> From: Doc Shipley <doc at vaxen.net>
> To: Cameron Kaiser via cctalk <cctalk at classiccmp.org>
> Subject: Re: Tektronix XpressWare 8.1
> Message-ID: <8c287f5c-4ad8-1002-570c-1c671c689494 at vaxen.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> On 8/22/21 19:16, Cameron Kaiser via cctalk wrote:
>> Bitsavers has 6.3 (thank you Al) but I'm trying to push my luck and find
>> 8.1 for this XP421CH Xterm. Anyone know of where it can be found?
>>
>
> Well....
>
> There's this:
>
> http://bio.gsi.de/DOCS/NCD/www.technogoths.demon.co.uk/tekxp400/node3.html
>
> and there's this:
>
> http://www.docsbox.net/V81106.tgz
>
> Please don't kill my server.
>
> ? It's been a long long time since I had the XP400D, and I don't think I
> ever tried connecting from Windows, so you're kind of on your own.? Good
> luck!
>
>
> ? Doc
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 23 Aug 2021 10:11:26 +0100
> From: Peter Allan <petermallan at gmail.com>
> To: Warner Losh <imp at bsdimp.com>
> Cc: "General Discussion: On-Topic and Off-Topic Posts"
> ? <cctalk at classiccmp.org>, Ethan Dicks <ethan.dicks at gmail.com>
> Subject: Re: Ultrix-11
> Message-ID:
> ? <CAJCrz55x935vV+O2=eoRyb2ythgQmRVGXx6HGZZFi8rjdv0TEA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Thanks Warner and Ethan. That is very helpful.
>
> I had not realised that the partition sizes were REALLY hard wired - as in
> set in the code. That explains why there is no option to set the size at
> installation time.
>
> I will redo the installation with that in mind.
>
> Cheers
>
> Peter
>
> On Fri, 20 Aug 2021 at 22:03, Warner Losh <imp at bsdimp.com> wrote:
>
>>
>>
>> On Fri, Aug 20, 2021, 2:26 PM Peter Allan via cctalk <
>> cctalk at classiccmp.org> wrote:
>>
>>> The idea of using an RA81 drive as it is bigger sounds like a simple
>>> solution, but does it actually give a larger /usr partition? Even though
>>> an
>>> RD54 drive is not huge, most of it is not taken up by the root partition
>>> plus the /usr partition, but is available for use as (on the video at
>>> least) /user1.
>>>
>>> I will give it a try after the weekend and see what happens.
>>>
>>
>> I was going to try tonight. The dksizes.c table suggests that it is 10MB
>> instead of 8.5MB on the RD54. Yet someone else said it was smaller, so I
>> wanted to check....
>>
>> Warner
>>
>>
>> Cheers
>>>
>>> Peter Allan
>>>
>>> On Fri, 20 Aug 2021 at 17:38, Ethan Dicks <ethan.dicks at gmail.com> wrote:
>>>
>>>> On Fri, Aug 20, 2021 at 11:50 AM Peter Allan via cctalk
>>>> <cctalk at classiccmp.org> wrote:
>>>>> I just installed Ultrix-11 3.1 using the ultrix31.tap file from
>>>>> https://pdp-11.org.ru/files.pl?lang=en
>>>>> which is the location from the comments in Stephen's Machine Room
>>> video
>>>> on
>>>>> YouTube that I think started this thread.
>>>>>
>>>>> It installed just fine, but just like the video, I ran out of space on
>>>> /usr.
>>>>
>>>> /usr was usually tight back in the day.
>>>>
>>>>> How can I make a larger /usr partition? Is it possible to do this at
>>>>> installation time? There did not seem to be an option for this. Can
>>> it be
>>>>> done by using an additional disk? That would seem likely, but not
>>> what a
>>>>> system manager back in the 70's or 80's would expect to need to do,
>>>>> especially as there is a relatively large amount of space left to
>>> create
>>>>> /user1.
>>>>
>>>> In the 70s and early 80s, it was not at all uncommon to have multiple
>>>> disk drives mounted to add up to enough space, especially to put user
>>>> files on their own device to keep them from competing with free space
>>>> in the system areas.? Also, older, smaller disks were often cheaper
>>>> than the newest/largest disk drives, or systems would be put together
>>>> from repurposed hardware rather than purchasing new.? For a single
>>>> data point, my employer bought a new RA81 in 1984.? For 424MB it was
>>>> $24,000.? Most machines had a _lot_ less disk in those days.? Our main
>>>> UNIX machine was an old 11/750 (2MB RAM) with 2x RK07 (28MB each).? It
>>>> was quite a jump when I put Ultrix 1.1 on an 11/730 w/RB80.? The CPU
>>>> was 30% slower, but it had 5MB of RAM and a 121MB disk, so as a
>>>> machine that spent most of its time with a single user (me), it was
>>>> fine.
>>>>
>>>> When disks were routinely 1-30MB (RK05... RK07 or RP03), it was
>>>> totally common to have 2-3 disks on a machine.
>>>>
>>>> All that said, I looked over this install write-up and it seems to
>>>> assume you have one disk and it slices and dices with default sizes...
>>>>
>>>>
>>>>
>>> http://ftp.fibranet.cat/UnixArchive/Distributions/DEC/Fred-Ultrix3/setup-3.…
>>>>
>>>> I've installed older versions of UNIX where you had to explicitly set
>>>> up disks and partitions (where you _could_ resize partitions).? Prior
>>>> to restoring the contents from tape.? That didn't appear to be as easy
>>>> with this installer script.
>>>>
>>>>> I noted the options for installing software using soft links to other
>>>>> locations. Was that the preferred method when installing additional
>>>>> software?
>>>>
>>>> That was done, as was mounting an entire second disk for /usr.? One of
>>>> the challenges is making sure you have enough tools accessible on the
>>>> boot device to bring the machine up far enough to mount the additional
>>>> devices.? This is part of why there are system tools in /bin,
>>>> /usr/bin, etc.? You could depend on the contents of /bin being there
>>>> before /usr was mounted.? Also, traditionally, programs in /bin were
>>>> statically linked so that you didn't have to have specific libraries
>>>> available at the time.
>>>>
>>>> The simplest solution, of course, is just get a bigger disk, but where
>>>> that wasn't possible (which was most of the time), people did use soft
>>>> links or multiple spindles to aggregate enough space to get by.
>>>>
>>>> Back in the day, I struggled to get enough disk space to install
>>>> 2.9BSD on an 11/24.? Two RK07s would have been a luxury.? I had an
>>>> RL02 (10MB) and I think maybe an RL01.? I could get the initial
>>>> restore to work but I didn't have enough space to rebuild my kernel.
>>>>
>>>> -ethan
>>>>
>>>
>>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 23 Aug 2021 07:57:44 -0700 (PDT)
> From: geneb <geneb at deltasoft.com>
> To: cctalk at classiccmp.org
> Subject: Need Spectravideo SVI-328 parts....
> Message-ID:
> ? <alpine.LRH.2.21.2108230756300.23222 at sidewinder.deltasoft.com>
> Content-Type: text/plain; format=flowed; charset=US-ASCII
>
>
> I've got a very nice SV-328 that's had the sad misfortune of having the
> "K" key rather violently removed. (https://i.imgur.com/IxBIQTj.jpg)
>
> Can someone point me to where I could obtain a replacement key top and
> post?
>
> Thanks!
>
> g.
>
>
> --
> Proud owner of F-15C 80-0007
> http://www.f15sim.com - The only one of its kind.
> http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
> Some people collect things for a hobby.? Geeks collect hobbies.
>
> ScarletDME - The red hot Data Management Environment
> A Multi-Value database for the masses, not the classes.
> http://scarlet.deltasoft.com - Get it _today_!
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 23 Aug 2021 17:29:08 +0100
> From: "Rob Jarratt" <robert.jarratt at ntlworld.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> ? <cctalk at classiccmp.org>
> Subject: 3d modelling software
> Message-ID: <00b401d7983b$ff929d50$feb7d7f0$(a)ntlworld.com>
> Content-Type: text/plain; charset="us-ascii"
>
> I think I may need to get a small part 3d printed (some plastic board
> mounting guide rails from a PDP 11/24 H7140 PSU). What software is best for
> a novice? Preferably free!
>
>
>
> Thanks
>
>
>
> Rob
>
>
>
> End of cctech Digest, Vol 83, Issue 23
> **************************************
The quick-'n-easy solution I found when I needed to model some parts
for a keyboard was https://www.tinkercad.com/ - needs a modern-ish web
browser and a modestly beefy system tho.
I've got a very nice SV-328 that's had the sad misfortune of having the
"K" key rather violently removed. (https://i.imgur.com/IxBIQTj.jpg)
Can someone point me to where I could obtain a replacement key top and
post?
Thanks!
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!
I just installed Ultrix-11 3.1 using the ultrix31.tap file from
https://pdp-11.org.ru/files.pl?lang=en
which is the location from the comments in Stephen's Machine Room video on
YouTube that I think started this thread.
It installed just fine, but just like the video, I ran out of space on /usr.
How can I make a larger /usr partition? Is it possible to do this at
installation time? There did not seem to be an option for this. Can it be
done by using an additional disk? That would seem likely, but not what a
system manager back in the 70's or 80's would expect to need to do,
especially as there is a relatively large amount of space left to create
/user1.
I noted the options for installing software using soft links to other
locations. Was that the preferred method when installing additional
software?
Any help would be greatly appreciated.
Cheers
Peter Allan
Bitsavers has 6.3 (thank you Al) but I'm trying to push my luck and find
8.1 for this XP421CH Xterm. Anyone know of where it can be found?
--
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
-- FOOLS! I WILL DESTROY YOU ALL! ASK ME HOW! -- "Girl Genius" 8/29/07 --------
Hi cctalk,
I'm looking to replicate the 24-contact connector system that IBM used on
SLT and MST cards for many years. Has anyone done this before?
The best photos of this connector that I can find online are on this page:
http://techandtrouble.blogspot.com/2014/04/happy-50th-system360-pt5-anatomy…
I haven't searched Bitsavers documentation extensively for IBM
specifications, but I've seen some details around page 54 of this document:
http://www.bitsavers.org/pdf/ibm/logic/SY22-2798-2_LogicBlocks_AutomatedLog…
I'm interested in reproducing both polarities of this connector: plug and
socket. Also, even though the most familiar use of this connector is for
board-to-board interconnect, I'm most interested in wire-to-board
interconnect. IBM used this method for DC power connectors in its 5100,
5110, and 5120 computers. Here are images of this specific connector:
http://stepleton.com/connector/
taken as still images from a YouTube video on the IBM 5120 by Jerry Walker (
https://www.youtube.com/c/JerryWalker-JMPrecision/videos).
I've designed and built a device that monitors DC power supply voltages for
overvoltage and undervoltage excursions and cuts off all power rails if any
voltage goes out of spec. I hope to use it to protect my own IBM 5100 from
major power supply faults like the one CuriousMarc encountered with his
9825T:
https://www.youtube.com/watch?v=b-eN93L6yX8
In order to put my device between my 5100's power supply and the logic card
backplane, I need to recreate a plug and a socket so that I can fashion a
cable that goes out to my device. If anyone has created dependable modern
versions of these connectors, would you mind sharing any pointers?
Thanks for any help,
--Tom
> From: Bill Degnan
> Was there a UNIBUS storage system that used a cassette player as the
> storage device .., rigged to send receive signals via a serial card
> connection.
Yes and no. There is the TA11 Magnetic Tape Cassette System, which used the
TU60 Dual DECasette Transport (I need to create a page for that in the
CHWiki), but it uses a special controller card, the TA11 Magnetic Tape
Cassette controller:
https://gunkies.org/wiki/TA11_Magnetic_Tape_Cassette_controller
There is a small cheap tape system which used a stock serial interface to talk
to the computer, the TU58, but those used DECtpe-II cartridges, not standard
casettes.
Noel
I just saw there is an ME11 Memory Expansion unit on eBay (not mine), stamped 'M11'.
https://www.ebay.com/itm/114941479208
Until seeing this one I had not heard of any other units out there apart from the one I recovered
(ex-BHP steelworks) a few years ago. Mine was connected by a flexprint cable to a rebadged PDP-11/15.
If anyone here ends up with it, I have an OpenSCAD model of the Mazak bracket p/n 1211221 that holds
the regular 5-1/4" DEC fascia panel onto the front of the H-909 cabinet this unit uses.
This is the same cabinet as the slimline PDP-11/05 and to be honest when I found the ME11 that's
what I thought it was, and that the console and CPU boards were missing. I then found the fascia panel
with the original brackets close by, and it fitted exactly.
I've printed a few from PET and they work as well as the originals (including the threaded hole), so
I could do a few more for whoever gets the eBay one should they want them.
I am slowly scanning the ME11 print set too as I've not found any online copy out there so far.
Steve.
