How to install ! Unix v5 on SIMH?

We can run ! Unix v5 on the SIMH PDP-11 emulator. First, we need to download the ! Unix v5 kit.

Downloads

You can download the kit needed to run ! Unix v5 on the SIMH PDP-11 emulator from the “SIMH Legacy” website:

• ! Unix-v5 kit

Using ! Unix-v5

tip

If you have not already installed SIMH PDP-11 emulator, see the VirtualHub Setup tutorial on how to do so on Linux and Windows.

Extract the archive you downloaded. Inside you will find a file called several files. Create a folder somewhere to store the files for this VM and move the unix_v5_rk.dsk file into it.

Now we will create a config file for our VM. Create a text file called pdp11.ini with the following content in the VM folder:

set cpu 11/45
att rk0 unix_v5_rk.dsk
boot rk0

Now open a terminal and move to the VM folder. Run the following command to start the emulator:

pdp11

After the emulator starts, you will get a @ prompt. Type unix and press enter to run the unix kernel.

You will be asked to log in. Type root and press enter to log in. There is no password.

You can now run ls to see the list of files. To change directory, you need to use the chdir command, cd is not available.

That's it! We used ! Unix-v5. We can create a shell script to make it easy to launch the VM.

Linux

Create a file called unix-v5.sh with the following content:

#!/bin/bash
pdp11

Now make the file executable:

chmod +x unix-v5.sh

Now you can start the VM using the shell script. For example, on KDE you can right-click the file and choose Run in Konsole or on GNOME, where you can right-click the file and choose Run as executable. The VM will start.

See the manuals section on the main ! Unix-v5 page to learn how to use it.

Windows

Create a file called unix-v5.bat with the following content:

pdp11

Now you can start the VM by double-clicking the shell script. See the manuals section on the main ! Unix-v5 page to learn how to use it.

Credits

• The disk image and other files used above are from a kit available on SimH “Classic” website.
• This tutorial is based on Computer History Wiki tutorial on running ! Unix v5 on SIMH.

Video tutorial

Do you want to follow the tutorial by watching a video? We will post a video on our YouTube channel soon.

Archives of this tutorial are available on Wayback Machine.