Hi!
I'm offering an Atari Portfolio HPC-004 along with a 64 KB Memory Card
for the cost of shipping (located in Germany.) It boots / works (using
batteries), but I'm missing its original wall wart.
Is anybody interested?
Thanks,
Jan-Benedict
--
I've been working on a new memory board for the Apple ///, using (somewhat)
modern and still-in-production components, especially CMOS static RAM
rather than DRAM. Last night I soldered the connectors, sockets, and
passives of my first prototype:
https://flickr.com/photos/_brouhaha_/albums/72157719738576267
I need to do some testing for shorts, etc. before I attempt to actually use
it in an Apple ///. I expect that some debugging of the design will be
required.
The Apple /// design is _much_ more complex that the Apple II and IIe. I
intended this board to provide 512KiB of RAM, but I've already determined
that some design changes will be required for that, so this prototype will
only support 256KiB.
The early Apple /// design, as documented in US patents, would have
supported up to 512KiB of RAM, but the actual shipped design reduced that
to 256KiB. There was a third-party 512Kib emory board from "On Three",
which required pulling various chips from the motherboard and running
cables from those to the memory board.
The SOS operating system, as shipped, only supported 256KiB. On Three
modified the SOS bootloader to detect and use 512KiB. Some Apple ///
application software also had trouble with 512KiB, and On Three patched
some of those.
>Hello,
>
>For the sake of illustration to folks who are not necessarily used to
>thinking about what computers do at the machine code level, I'm interested
>in collecting examples of single instructions for any CPU architecture that
>are unusually prolific in one way or another. This request is highly
>underconstrained, so I have to rely on peoples' good taste to determine
>what counts as "interesting" here.
This is perhaps outside even the vague bounds you were thinking of, but it
probably wins the 'unusually prolific' prize by a gigabyte-mile.
Behold, the hidden, secret and heinous X86 2-byte 'launch instruction' 0x0F, 0x3F.
See this talk about the discovery:
https://www.youtube.com/watch?v=jmTwlEh8L7g
DEF CON 26 - Christopher Domas - GOD MODE UNLOCKED Hardware Backdoors in redacted x86 46:03
DEFCON Conference Oct 23, 2018
Complexity is increasing. Trust eroding. In the wake of Spectre and Meltdown, when it seems that things cannot get any darker for processor security, the last light goes out. This talk will demonstrate what everyone has long feared but never proven: there are hardware backdoors in some x86 processors, and they're buried deeper than we ever imagined possible. While this research specifically examines a third-party processor, we use this as a stepping stone to explore the feasibility of more widespread hardware backdoors.
After which you will never trust your Intel-based PC, ever again.
Guy
The Hitachi SH4 has a set of pipelineable vector instructions that
work on 4x4 and 4x1 length vectors (implemented as 2 sets of 16 FP
registers). Nothing compared to MMX/SSE/AVX, but relatively complex.
There are indications in the KDJ11-B processor spec on bitsavers that the
M8190 could be used in a multiprocessor configuration. For example, bit 10
of the Maintenance Register (17 777 750) is labeled "Multiprocessor Slave"
and indicates that the bus arbitrator is disabled. There is also section
6.6, "Cache Multi-Processor Hooks", that describes cache features that
allow multiprocessor operation.
Would it be as simple as connecting to 11/83 qbus together? And adding the
proper software.
Anybody ever heard of such a thing?
Chuck
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:
> Send cctech mailing list submissions to
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> or, via email, send a message with subject or body 'help' to
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of cctech digest..."
>
>
> 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
> **************************************
