On Wed, 23 Oct 2024, Mike Katz wrote:
> I agree with you but phrased differently. XMODEM is ubiquitous but CBBS created a
> totally new way of sharing information and is the forerunner of everything from
> CompuServe to the internet, instant messaging and even social media.
>
> Most people reading an obit would not appreciate the significance of a data transfer
> protocol however the first "social media" type message system they would understand.
Community Memory (Lee Felsenstein, Ephrem Lipkin, et al) preceded it by
about five years.
BUT, CBBS was the first with dial-up access [from home], rather than
dedicated publicly available terminals.
--
Grumpy Ol' Fred cisin(a)xenosoft.com
On 10/19/2024 12:00 PM, cctalk-request(a)classiccmp.org wrote:
> [cctalk] Re: RSX11M installation on real PDP11
>You may want to use simh (where you'll be able to mount tapes and RL02
>images) to do the installation and generate an RD32 image. Once you have
>the disk image, use vtserver (note - some versions are limited to 32MB
>images, but there are some that remove that limitation - check if the
>struct vtcmd in vtserver.c uses 2 or 4 bytes for the block number), or
>PDP11GUI (Windows only) to transfer the RD32 disk image to your PDP over a
>serial port.
If you go this route, be advised, that SIMH creates RD32 disk images are not the same size as a real RD32. This will likely cause problems when writing a SIMH created image to a real disk (and I'm not talking about the additional issues that the trailing metadata on disk images from the Pizzolato version of SIMH can cause - the problem I'm describing is caused by an incorrect disk size value in SIMH).
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason(a)comcast.net
I rue the day I lost an eBay auction. It was a PR photo with a good looking model mounting a disk in an open drawer of a 2314. If you looked carefully you would see she was holding a 2311 disk. The 2314 pack was probably too heavy to use for all the repeated takes the photographer wanted. 😊
I have recently been able to fix my early 380Z blue case however it is a cassette only system and it’s not as simple as adding my spare disk controller so I’m on the lookout for 380 software cassettes or dumps of those cassettes so I can run software on it and demonstrate it at VCF Zurich in January
Hello to the group,
I have acquired some boards and a backplane for a PDP 11/23+. The disk
controller is an RQDX3 and I have a 3.5" drive that works as an RX50. I
have a greazeweasle so I am able to write RX50 images to 3.5 inch
floppies. I also have an RD32 MFM drive that also works.
Since I have an M8189 CPU board, I have a second serial port that works as
a TU58 device so I can use the tu58em emulator. I also have 512K of memory
and a DZV11. Using the TU58 emulator I have been able to get RT-11 up and
running on it.
My goal though is to try and get RSX11M (I have no FPP right now) on it,
but I am somewhat at a loss on how to get it installed. Anyone have any
suggestions on how I could do that? I have some .tap files and some RL02
images with various versions of RSX11M, but I don't know how to get them
onto my RD32 drive.
Thanks in advance for any pointers or suggestions.
And let me just say I love finally having a real PDP11!!
-Peter
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
One approach would be to use a 50Hz/400Hz power converter. There are ones on the market creating almost pure sinus output with minimal harmonics.
Another approach would be to substitute the old psu by modern ones, possibly by DC-DC converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did this in the past?
Best
Andreas
Hi all,
I do see a lot of CDC documentation on bitsavers like software, hardware
concepts, programming concepts, but no logic diagrams, schematics, detailed
assembly etc.
Didn't publish CDC logic diagrams, schematic, board layouts etc, esp. of
course for the 180/8xx series in the past - wasn't such kind of docs ever
available?
A.
1945 - 2024
Found dead 10/11/24 in a "wellness check".
Little or no other information yet.
Ward Christensen created the first "BBS".
Then, when he needed to transfer files, he created XMODEM. The XMODEM
protocols became the de facto standard for transferring files.
Later, there was some competition from Kermit, but, other than being "FROM A
UNIVERSITY!", it wasn't nearly as good.
Not only are all of the greats dying off, but soon there won't be anybody
around who even knew about them.
--
Grumpy Ol' Fred cisin(a)xenosoft.com
Next try …
https://flic.kr/s/aHBqjBMV48
A.
> Am 15.10.2024 um 15:28 schrieb Milo Velimirović <milovelimirovic(a)gmail.com>:
>
> The photos didn’t make it through. I’ve got a pdp11/05 that I’d like to restore and new PSUs make total sense to me. Please send photos directly.
>
> Thanks!
> —Milo
>
>> On Oct 12, 2024, at 6:35 AM, hupfadekroua via cctalk <cctalk(a)classiccmp.org> wrote:
>>
>> Hi all,
>>
>> Once I visited LCM some years ago I was allowed to visit their repair laboratory.
>>
>> I was introduced to an approach to substitute DEC BA11 PSU modules by modern DC-DC converter modules.
>>
>> They used a 3D printed plastic chassis to mount the converter, electrolytic as well as the connectors to be fitted into the psu chassis of a BA11 enclosure, quite nice.
>>
>> See photo attached …
>>
>> Does someone knows if this stl or design has been saved while or after LCMs closure?
>>
>> Best
>>
>> Andreas
>
