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Posted by davepl 1 day ago

A restored PDP-11/83 serving this page on 211BSD Unix(pdp1173.com)
The box is a restored Q-bus PDP-11/83 named minerva: Mentec M11 CPU, two chassis tied with M9404/M9405, RQDX3, 2xEmulex UC07, KDA50, RLV12, DEQNA, M3104. Storage is RA82 + dual RA92, MFM boot/swap, dual RL02, RX50s, and a TKZ50. OS is 2.11BSD.

The live panel is top. /cgi-bin/webtop is the raw snapshot.

A 16-bit httpd will not survive the front page, so Varnish/Caddy/Cloudflare cache the HTML and a 5-second webtop sample. Origin is still the 11 itself, and it handles all of the webtop and visitor count requests.

Telnet exists (pdp1173.com, guest) but it is a 40-year-old UNIX with no modern security story. Please do not treat it as a challenge box; I can restore from tape, but that ruins it for everyone else.

Happy to answer Mentec, MSCP, Q-bus, or 2.11BSD questions.

To get BSD running on the Mentec, I had to customize the BSD kernel to use FPSIM, as the Mentec supports IEEE floating-point and NOT the DEC formats.

97 points | 44 commentspage 2
hartjer 19 hours ago|
Has to be cached, no? Its snappy
hinkley 21 hours ago||
How about a nice game of chess?
budman1 1 day ago||
as of 12 noon CST, it pings but does not telnet.
encom 18 hours ago||
>A restored PDP-11/83 serving this page on 211BSD Unix

No it isn't.

  ~$ whois $(dig +short pdp1173.com | head -n1) | grep netname
  netname:        CLOUDFLARENET-EU
davepl 18 hours ago|
It is though. Dig deeper.
mlmonkey 1 day ago||
Why is the domain `pdp1173.com` when the machine is a PDP 11/83 ?
ktm5j 23 hours ago||
There's a couple eyebrow raising things about this post.. like the fact that there's nothing but vague details in text and one photo with an AI prompt like alt-text. I think they're just trying to get clicks for that banner ad.
roryirvine 23 hours ago|||
Sadly, the site does seem AI-flavoured to a rather off-putting extent.

And, as you say, the details are so vague - it's exactly what you might expect if an LLM wrote them based on reading a spec sheet rather than any practical experience.

In particular, connecting that DEQNA to a modern network must have been a huge challenge all in itself and I'd have expected there to be a series of blog posts about just that. Maybe it's legit (and I'd love more detail if it is), but right now the presentation screams "thinly disguised ad".

spijdar 22 hours ago|||
I think he has actually posted videos of the restoration before (they've popped up in my youtube feed in the past), but I've never watched them, so dunno. The LLM site design and advertisement front-and-center are certainly a... choice....

But, more importantly, why do you reckon DEQNA would be hard to connect to a modern network? NetBSD still supports it when running on a q-bus VAX: https://github.com/NetBSD/src/blob/trunk/sys/dev/qbus/if_qe....

It has some pretty broken behavior regarding multicast/broadcast traffic IIRC, but nothing putting it behind a vlan or separate LAN altogether wouldn't solve. I've got a little lsi-11 system under my bed I'm hoping to, one day, get the Fuzzball [0] distribution running on. The 22-bit address extension wirewrap the previous owner did needs to be redone entirely, so it's been a "later" project for years now, but I am hoping my little DEQNA will be able to ping the Internet still.

[0] https://en.wikipedia.org/wiki/Fuzzball_router

roryirvine 22 hours ago||
I was assuming that something of that vintage would only have been able to handle a 10BASE5 transceiver, but a wee bit of googling suggests that an UTP transceiver works well enough.

Needs a patched ROM and recompiled kernel, though! See http://www.cosam.org/computers/dec/pdp11-23/20080402.html (and the two subsequent installments)

(That cosam.org site is more what I'd be expecting for a project like this, but maybe I'm just too old and grumpy for my own good!)

dboreham 21 hours ago|||
Dave posts frequently about his work, some on YouTube and some on Facebook. You have to be in the right groups on FB.
ktm5j 19 hours ago||
You and several other people here are making unsubstantiated claims about how you're super sure this is real in a way that makes it seem less real. You guys seem to know this Dave character and are doing him a solid, right?
dcminter 19 hours ago||
Dave Plummer's a well known YouTuber. He pops up in a couple of DEC groups that I'm in on Facebook. However I'm not a fan. He seems to take a lot and contribute only self-promotional videos.

The photo on this page looks very AI heavy. I'm not an expert but I really don't think those light panels are real (if they're real they're not contemporary to the machines they're in).

(Edit: I should qualify that I don't mean the panel with the octet switches, that looks roughly right - I mean the one under the 8" disks and the one on the vaguely Vax-pedestal looking thing)

ktm5j 6 hours ago||
Okay gotcha, sorry I was jumping to conclusions.
dcminter 5 hours ago||
Given the AI-heavy page, I don't think your skepticism was unreasonable.
cube00 23 hours ago|||
While probably it's legit because I've seen Dave discussing the process on the YT channel (which I no longer watch) he unfortunately does have form https://news.ycombinator.com/item?id=39813625

Having TMOG on a .org when it sells commercial licences doesn't sit well with me given the history.

davepl 18 hours ago|||
FWIW, .com was taken so I registered .org, and it's only used for the free version. The PRO version lives at tmog.store, which should be pretty plain.
cube00 10 hours ago||
> The PRO version lives at tmog.store

https://tmog.org/pro.html

roryirvine 23 hours ago||||
Oh, yeah - this popped up on HN yesterday too and also met with scepticism: https://news.ycombinator.com/item?id=49772362

Oh well, so this PDP restoration probably isn't real. Disappointing.

davepl 18 hours ago|||
"Probably isn't real". Interesting theory.
ktm5j 6 hours ago||
Well be real, you could do a lot more to make this convincing. Couple the lack of details with some other posts you've made that seem to be an attempt at advertising your software (the one with a big banner on this page), sprinkle in the AI generated website and the fact that the domain name says a different model than the page does.. this is going to raise some eyebrows.

You put all this work into a project like this, all you would need to do to prove it's real is post a selfie with the hardware.. but "interesting theory" is all you're going to say?

dboreham 21 hours ago|||
What's not real about it?
ktm5j 23 hours ago|||
I'm a little confused by your comment.. especially considering the fact that you edited it and changed the link from and old comment thread from 2024 to whatever this dead post is from 2012. What does having form mean? Who is Dave?
cube00 23 hours ago||
Sorry, lost the last digit, fixed now. This restored PDP-11/83 project is Dave Plummer's
davepl 18 hours ago||
Because it started as a 15Mhz 11/73 but I later upgraded it to an 18MHz 11/83 CPU. And now it's a Mentec M1, but it's still an "83 class" machine. That's my thinking, anyway.
corbinvachal 1 day ago|
[dead]