[TUHS] Work I've done with a PDP-11 simulator

[spedraja@gmail.com (SPC)]

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Of course I am :-)

Kind Regards
SPc.


2014-04-30 4:19 GMT+02:00 Noel Chiappa <jnc at mercury.lcs.mit.edu>:

> Hello, all: I'm working (long-term) on a project to bring back to life the
> V6+ Unix system (it wasn't vanilla V6 - it looks like it had some PWB stuff
> added) that was used on a number of machines at the Laboratory for Computer
> Science at MIT in the late 70s - early 80s.
>
>
> As part of that, I've been playing with bringing up V6 on a PDP11
> simulator,
> and have written some stuff that would probably be useful to anyone who's
> interested in bringing up Unix on a PDP-11 simulator.
>
> I used the Ersatz-11 simulator from D-Bit (for no particularly good reason,
> except it runs under Windoze, and the "FAQ on the Unix Archive and Unix on
> the PDP-11" page said it was the fastest).
>
> I have been very pleased with this simulator; it is indeed fast (my
> simulated
> 11/70 runs at about 100 MIPS on a relatively elderly Athlon, which is about
> 30 times as fast as a real one used to :-), and it has lots of nice
> features
> (e.g. you can TELNET in to a terminal port on the simulated PDP-11).
>
> It also has this nice virtual device that allows a program running on the
> simulated PDP-11 i) access to files in the Windows file system, and ii) to
> issue commands to the emulator. I have written a V6 driver for it (should
> be
> fairly easy to adapt to V7 or later), and a suite of Unix commands to grab
> a
> file off the Windows file system (both binary and text mode), and issue
> various commands to the simulator.
>
> Finally, I have a number of Windows commands to do various useful things,
> such as read a file off a simulated Unix V6 file system (hosted in a
> Windows
> file), including ports of a number of Unix commands (e.g. ncheck, nm,
> etc); I
> don't detail them all here as I don't want this email to get too long (and
> boring).
>
>
> I'm not sure if anyone's interested in any of this; if so, I can send
> in more info (or whip up a Web page, whichever would be better).
>
> I also ran into a number of pitfalls on the way to getting V6 running,
> using
> RK05 disk images from the TUHS archive, and I can do a short writeup on
> 'How
> to bring up V6 under Ersatz-11' if anyone's interested.
>
>         Noel
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