I imagine the author's using OpenSIMH (https://opensimh.org) or something similar, so it'd be an emulated CPU running the userlands. I have a container that runs a 4.3 BSD userland using opensimh; it's not super hard to set up, just takes a bit of patience and willingness to learn how opensimh…

Are you doing this with https://opensimh.org/ ?

http://ibm1130.org/emu/ https://opensimh.org/simdocs/ibm1130_doc.html

Nit: > I also know that Java works via the "Javascript Virtual Machine" Java Virtual machine. That Java and JavaScript are named the way they are is... basically a historical accident of a cross-promotion gone too far, IMO. They aren't really related (at least, in the way that the name might…

> I wish someone would write an IBM 650 emulator I don’t know how good they are and there may have been multiple IBM 650s, but Google gives me several hits, including: - https://opensimh.org/simdocs/i650_doc.html - https://github.com/rsanchovilla/SimH_cpanel (adds front panel GUI to the above) -…

https://opensimh.org/ Works great on Apple Silicon

> "There's no fundamental problem with getting a modern Unix to run on a VAX except for all the details" Pretty much. The main issue with modern Unx on a VAX is memory size & performance, which combine to make native compiling under recent gcc versions "problematic", so cross building in gcc-10 or…

that's a ridiculous excuse unix v7 included a compiler and was three megabytes https://www.tuhs.org/Archive/Distributions/Research/Keith_Bo... https://opensimh.org/research-unix-7-pdp11-45-v2.0.pdf the compiler was a tiny fraction of that gcc 9 is about 50 megabytes windows 11 is over 8 gigabytes;…

It just resulted in the open and official fork - OpenSIMH[1]. [1] https://opensimh.org/ [2] https://github.com/open-simh/simh

Perhaps, however, SIMH (http://simh.trailing-edge.com/, https://opensimh.org/) also calls itself a simulator rather than an emulator. Six of one, half dozen of the other, I guess!