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

[Gregg Levine]

Hello!
What he said. I believe we all are interested.
-----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."


On Sat, May 3, 2014 at 6:14 PM, SPC <spedraja at gmail.com> wrote:
> 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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>
>
>
>
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>
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> --
> Sergio Pedraja
>
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