#pdp11 — Public Fediverse posts

#RetroComputing Meetup @cbase
Freitag, 03.07. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

#RetroComputing Meetup @cbase
Freitag, 03.07. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

I remember when C was just high level PDP-11 assembler.

#BSD #C #PDP11

I remember when C was just high level PDP-11 assembler.

#BSD #C #PDP11

A Dutch dev uncovers a Y2K relic: an NTP bug in BSD 2.11 affecting PDP-11/70 setups using vintage PSTI short-wave time receivers — 17,000-year offset fixed on GitHub. 🕰️🖥️🔧 #Y2K #PDP11 #RetroComputing https://www.theregister.com/offbeat/2026/06/15/the-y2k-bug-is-back-dutch-dev-digs-up-untimely-flaw-in-old-bsd-build/5255645

A Dutch dev uncovers a Y2K relic: an NTP bug in BSD 2.11 affecting PDP-11/70 setups using vintage PSTI short-wave time receivers — 17,000-year offset fixed on GitHub. 🕰️🖥️🔧 #Y2K #PDP11 #RetroComputing https://www.theregister.com/offbeat/2026/06/15/the-y2k-bug-is-back-dutch-dev-digs-up-untimely-flaw-in-old-bsd-build/5255645

@stx did it look anything like one of these (there are three PDP-11s in the rack)

#pdp11

@stx did it look anything like one of these (there are three PDP-11s in the rack)

#pdp11

Long shot, but does anyone have a disk-image (RL02, etc) for the pdp-11 containing the DEQNA diagnostics (XXDP)?

#pdp11 #dec #xxdp #deqna

Long shot, but does anyone have a disk-image (RL02, etc) for the pdp-11 containing the DEQNA diagnostics (XXDP)?

#pdp11 #dec #xxdp #deqna

@bcantrill For some reason Dave Plummer has been spending half his days in ye olde #BSD on his #PDP11 and was inspired to compose an ode to fopen() and by extension the Unix Way.
https://youtu.be/XAzUoizwnXM

@bcantrill For some reason Dave Plummer has been spending half his days in ye olde #BSD on his #PDP11 and was inspired to compose an ode to fopen() and by extension the Unix Way.
https://youtu.be/XAzUoizwnXM

Внутреннее устройство ОС RT-11. Копаемся в исходном коде. Часть третья

В операционной системе RT-11 существуют варианты резидентного монитора с поддержкой многозадачности — например, RMONFB. Многозадачность здесь реализована полностью на программном уровне, без аппаратной поддержки. Если вам интересно посмотреть исходный код, отвечающий за многозадачность в RT-11, вместе с пояснениями из Руководства системного программиста — добро пожаловать под кат.

https://habr.com/ru/articles/1042496/

#pdp11 #rt11 #многозадачность

Repórter Retro 125

https://retropolis.com.br/2026/05/27/reporter-retro-125/

#ReprterRetro #68008 #AdrianBlack #Agfa #BASIC #ChandlerKlser #CoCoTown #DavesGarage #disquete #Doom #FTP #Homebrew #IbmPc #IbmPcConvertible #IbmPs2 #IMSAI8080 #Intel #Intel80486 #IntelignciaArtificial #JogosDeGuerra #LGP21 #Microdigital #MITTX0 #NeoGeo #OldComputersSucked #OsborneI #PDP11 #Plexus #RetroRio #RFC #RioRetrogames #TCPIP #TechTangents #TK3000IIe #TRSColor #UsagiElectric #VCFMidwest

Repórter Retro 125

https://retropolis.com.br/2026/05/27/reporter-retro-125/

#ReprterRetro #68008 #AdrianBlack #Agfa #BASIC #ChandlerKlser #CoCoTown #DavesGarage #disquete #Doom #FTP #Homebrew #IbmPc #IbmPcConvertible #IbmPs2 #IMSAI8080 #Intel #Intel80486 #IntelignciaArtificial #JogosDeGuerra #LGP21 #Microdigital #MITTX0 #NeoGeo #OldComputersSucked #OsborneI #PDP11 #Plexus #RetroRio #RFC #RioRetrogames #TCPIP #TechTangents #TK3000IIe #TRSColor #UsagiElectric #VCFMidwest

Repórter Retro 125

https://retropolis.com.br/2026/05/27/reporter-retro-125/

#ReprterRetro #68008 #AdrianBlack #Agfa #BASIC #ChandlerKlser #CoCoTown #DavesGarage #disquete #Doom #FTP #Homebrew #IbmPc #IbmPcConvertible #IbmPs2 #IMSAI8080 #Intel #Intel80486 #IntelignciaArtificial #JogosDeGuerra #LGP21 #Microdigital #MITTX0 #NeoGeo #OldComputersSucked #OsborneI #PDP11 #Plexus #RetroRio #RFC #RioRetrogames #TCPIP #TechTangents #TK3000IIe #TRSColor #UsagiElectric #VCFMidwest

Repórter Retro 125

https://retropolis.com.br/2026/05/27/reporter-retro-125/

#ReprterRetro #68008 #AdrianBlack #Agfa #BASIC #ChandlerKlser #CoCoTown #DavesGarage #disquete #Doom #FTP #Homebrew #IbmPc #IbmPcConvertible #IbmPs2 #IMSAI8080 #Intel #Intel80486 #IntelignciaArtificial #JogosDeGuerra #LGP21 #Microdigital #MITTX0 #NeoGeo #OldComputersSucked #OsborneI #PDP11 #Plexus #RetroRio #RFC #RioRetrogames #TCPIP #TechTangents #TK3000IIe #TRSColor #UsagiElectric #VCFMidwest

FINALLY succeeded in getting an Ethernet-adapter emulated in my PDP-11/70 emulator. With NAT (port-)forwarding it runs a tiny http-server connected to the internet. Reachable via http://188.212.113.203:8080/
Note that it is not very stable yet so it may become unreachable suddenly. No https or ip6 as the whole http-server should fit in less than 56 kB of RAM.

#retro #pdp11 #emulation

FINALLY succeeded in getting an Ethernet-adapter emulated in my PDP-11/70 emulator. With NAT (port-)forwarding it runs a tiny http-server connected to the internet. Reachable via http://188.212.113.203:8080/
Note that it is not very stable yet so it may become unreachable suddenly. No https or ip6 as the whole http-server should fit in less than 56 kB of RAM.

#retro #pdp11 #emulation

A #NeuralNetwork #AI on the #pdp11

https://www.youtube.com/watch?v=OUE3FSIk46g

#RetroComputing

A #NeuralNetwork #AI on the #pdp11

https://www.youtube.com/watch?v=OUE3FSIk46g

#RetroComputing

#RetroComputing Meetup @cbase
Freitag, 01.05. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

#RetroComputing Meetup @cbase
Freitag, 01.05. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

Внутреннее устройство ОС RT-11: копаемся в исходом коде. Часть первая

RT-11 — это операционная система из 1970-х годов для популярного в то время мини-компьютера PDP-11 фирмы DEC. В СССР известна под именами Электроника 60, ДВК, БК 0011М. Для тех, кто любит изучать чужой код в поисках инженерной эстетики — дальнейшее изложение.

https://habr.com/ru/articles/1026302/

#RT11 #PDP11 #DEC #БК0010 #РАФОС #ФОДОС

Occasionally I work on my PDP11/70 emulator (toy-project, in my spare time). The latest version can run BSD 2.11 multi-user on an ESP32-S3. Even though I wrote the emulator myself, I'm still amazed about the physical reduction in size. On the left in the picture below you see the original device (the thing in the 19" rack with all the lights and switches), on the right you see the ESP32: smaller than my hand!

#retro #emulation #pdp11 #dec #embedded #c++

Occasionally I work on my PDP11/70 emulator (toy-project, in my spare time). The latest version can run BSD 2.11 multi-user on an ESP32-S3. Even though I wrote the emulator myself, I'm still amazed about the physical reduction in size. On the left in the picture below you see the original device (the thing in the 19" rack with all the lights and switches), on the right you see the ESP32: smaller than my hand!

#retro #emulation #pdp11 #dec #embedded #c++

@dougmerritt Also

ZOMG ZOMG ZOMG

https://obsolescence.dev/pdp11.html

#PDP11 #Unix

@dougmerritt Also

ZOMG ZOMG ZOMG

https://obsolescence.dev/pdp11.html

#PDP11 #Unix

We have tested UNIX Fourth Edition with SIMH v3.12-5, and it worked!

#UNIX #UnixFourthEdition #Retrocomputing #DEC #PDP11 #PDP #TechNews #TechUpdates #Computers

https://officialaptivi.wordpress.com/2026/04/01/unix-fourth-edition-on-simh-v3-12-5/

We have tested UNIX Fourth Edition with SIMH v3.12-5, and it worked!

#UNIX #UnixFourthEdition #Retrocomputing #DEC #PDP11 #PDP #TechNews #TechUpdates #Computers

https://officialaptivi.wordpress.com/2026/04/01/unix-fourth-edition-on-simh-v3-12-5/

Spent some time this monday preparing the machine including installing 2.11BSD to the M2322 hard drive, as my DIY disk emulator showed some reliability issues at #why2025 . I'm still in the process of applying the latest updates to the system, as rebuilding kernels and part of the userland on a 1MB RAM, less than 1 MIPS system takes a fair bit of time.

Once I'm done updating the system, it will be at patch level 499 - the latest available for #211bsd , released on January 14th 2026!

If you want to play around with this system, visit the open day at RevSpace The Hague next saturday:
https://revspace.nl/OpenDag2026

I will be attaching a few physical terminals to it (including a VT55 and VT100!) as well as allowing telnet from the local network.

Besides this, if you do visit and want to trade PDP-11 parts, I have a large collection of mostly QBUS cards that I want to part with, and am looking for PDP-11/84 (PMI) and PDP-11/44 (EUB) memory boards as well as spare CPU cards for the /44.

#pdp11 #retrocomputing #unix #revspace #minicomputer

Spent some time this monday preparing the machine including installing 2.11BSD to the M2322 hard drive, as my DIY disk emulator showed some reliability issues at #why2025 . I'm still in the process of applying the latest updates to the system, as rebuilding kernels and part of the userland on a 1MB RAM, less than 1 MIPS system takes a fair bit of time.

Once I'm done updating the system, it will be at patch level 499 - the latest available for #211bsd , released on January 14th 2026!

If you want to play around with this system, visit the open day at RevSpace The Hague next saturday:
https://revspace.nl/OpenDag2026

I will be attaching a few physical terminals to it (including a VT55 and VT100!) as well as allowing telnet from the local network.

Besides this, if you do visit and want to trade PDP-11 parts, I have a large collection of mostly QBUS cards that I want to part with, and am looking for PDP-11/84 (PMI) and PDP-11/44 (EUB) memory boards as well as spare CPU cards for the /44.

#pdp11 #retrocomputing #unix #revspace #minicomputer

RE: https://hsnl.social/@revspace/116256653592044537

RevSpace, the hackerspace I'm a regular at, will have it's open day next saturday. I will be exhibiting my PDP-11/84 and possibly work on some other retro hardware as part of this.

Perhaps I'll attempt to repair my 11/44, or show off the VAX-11/750 I keep around there.

They do require visitors to sign up to help load balance the tours of the hackerspace, so check the link below.

#revspace #hackerspace #netherlands #thehague #retrocomputing #leiden #pdp11

RE: https://hsnl.social/@revspace/116256653592044537

RevSpace, the hackerspace I'm a regular at, will have it's open day next saturday. I will be exhibiting my PDP-11/84 and possibly work on some other retro hardware as part of this.

Perhaps I'll attempt to repair my 11/44, or show off the VAX-11/750 I keep around there.

They do require visitors to sign up to help load balance the tours of the hackerspace, so check the link below.

#revspace #hackerspace #netherlands #thehague #retrocomputing #leiden #pdp11

Dave y Tara usan una holocubierta basada en Window$ 95 como máquina del tiempo para regresar a 1973 y aprender cómo programar una DEC #PDP11 10 con 32K de memoria de núcleo y sin mouse, y votar a Cámpora! ¡Cargá tu cinta de papel perforado!
https://toobnix.org/w/opYtmBxS3GTGVdM3kpdE2D

Dave y Tara usan una holocubierta basada en Window$ 95 como máquina del tiempo para regresar a 1973 y aprender cómo programar una DEC #PDP11 10 con 32K de memoria de núcleo y sin mouse, y votar a Cámpora! ¡Cargá tu cinta de papel perforado!
https://toobnix.org/w/opYtmBxS3GTGVdM3kpdE2D

Last year, I drew a map of the ARPANET for an event featuring retro and vintage computing. It is based on various previously published maps from 1981, but has been redrawn using a vector graphics software. In addition, I marked computers with DEC PDP-10, PDP-11, and VAX architecture to show their role in the early Internet (there were PiDPs and some descriptions about them as exhibits). It was printed as a DIN A1 poster. Here is the result as a 4k JPEG file. #PDP #PDP11 #arpa #vintagecomputing

Last year, I drew a map of the ARPANET for an event featuring retro and vintage computing. It is based on various previously published maps from 1981, but has been redrawn using a vector graphics software. In addition, I marked computers with DEC PDP-10, PDP-11, and VAX architecture to show their role in the early Internet (there were PiDPs and some descriptions about them as exhibits). It was printed as a DIN A1 poster. Here is the result as a 4k JPEG file. #PDP #PDP11 #arpa #vintagecomputing

#RetroComputing Meetup @cbase
Freitag, 06.03. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

#RetroComputing Meetup @cbase
Freitag, 05.03. ab 20 Uhr
in der c-base, Rungestraße 20, 10179 Berlin

Offener #VintageComputing Stammtisch

Bei einem Getränk reden wir über Themen von #Zuse bis #Amiga, egal ob #Atari, #Commodore, #Apple oder #PDP8-#PDP11 - Hauptsache alte Rechner

Here's a timelapse of me programming a simple counter with a delay loop using the front panel. I entered one of the instructions wrong, so there's a bit of debugging going on as well. #retrocomputing #pdp11

Here's a timelapse of me programming a simple counter with a delay loop using the front panel. I entered one of the instructions wrong, so there's a bit of debugging going on as well. #retrocomputing #pdp11

Setup a ProxMox in my server rack for important work, like emulating a minicomputer from 1975. #pdp11 #blinkenlights

Setup a ProxMox in my server rack for important work, like emulating a minicomputer from 1975. #pdp11 #blinkenlights

Remember me, why else do I need a #pdp11 ?

I implemented a simple PDP11 CPU benchmark (no MMU, no I/O). I would like to compare its results to what a real PDP11 would do.
https://vanheusden.com/emulation/PDP-11/benchmark/
I'll add a table of results.
Anyone willing to try it?
Results with emulators are welcome to: please include system-type on which you ran it (and emulator-type & version, etc).
#retrocomputing #pdp11
@peterbjornx

I implemented a simple PDP11 CPU benchmark (no MMU, no I/O). I would like to compare its results to what a real PDP11 would do.
https://vanheusden.com/emulation/PDP-11/benchmark/
I'll add a table of results.
Anyone willing to try it?
Results with emulators are welcome to: please include system-type on which you ran it (and emulator-type & version, etc).
#retrocomputing #pdp11
@peterbjornx

🎉 Wow, breaking news: in 2025, someone actually found something from 1973 and thought, "Hey, let's patch this museum piece!" 🚀 Instead of living in the digital present, our hero is #LARPing as a '70s #UNIX Dev on a PDP-11 emulator. 🕶️ Buddy, maybe next you'll fix your abacus?
https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/ #breakingnews #retrocomputing #PDP11 #techhistory #HackerNews #ngated

От PDP-11 до Windows: как кросс-компилировать ретро-код на macOS без машины времени

Гайд по кросс-компиляции для ретро-платформ на macOS с Apple Silicon. Описаны настройка и использование: Open Watcom v2 — для DOS (16/32-бит), OS/2, Windows 3.x/9x/NT, с примерами сборки .com, .exe и функцией для переключения таргетов в shell. Amsterdam Compiler Kit (ACK) — компиляция ANSI C под PDP-11, с запуском крестиков-ноликов на Unix Version 7 в эмуляторе open-simh (включая создание лент, mkfs, restor, mknod). msvc-wine — полноценный MSVC-тулчейн для Windows (x86/x64/arm64) через LLVM Clang и LLD, без MinGW-зависимостей. Дополнительно: тестирование через Wine, DOSBox-X, OrbStack; фиксы для Apple Silicon. Подробные шаги по сборке, установке и примерам. Интересно? Велком внутрь.

https://habr.com/ru/articles/982928/

#кросскомпиляция #ретрокомпьютинг #PDP11 #Unix_V7 #Apple_Silicon #DOS #ACK #MSVC #Open_Watcom #macos

Having just read some #PDP11 assembler code, and similar in #m68k, #sparc, and #i386, my big take-away was that literally everything in computing would have been better in a world where #Zilog won.