Unix Version 5 (1974), Version 6 (1975) and Version 7 (1979) for PDP-11, installed in SIMH emulator.

How to start Unix from this archive

You need to start an emulator from this archive (pdp11.exe) and type into it:

  • Unix V5:
    do unix5

    When @ appears, type:


    Login is root, no password is needed.

  • Unix V6:
    do unix6

    When @ appears, type:


    Login is root, no password is needed.

  • Unix V7:
    do unix7

    When @ appears, type:


    You’ll see:

    New Boot, known devices are hp ht rk rl rp tm vt

    You must type:



PDP 11/20

More photos on SIMH site

Download links

Direct link (3,31 Mb)

Download link (adware-free)

ed2k (eMule, Kademlia)

5 Comments on “Unix V5, V6 and V7 for PDP-11”

  1. Keir says:

    Thanks for posting this! I had a lot of fun exploring the similarities (and differences) of early Unix and the Unix-likes I’ve worked with under CLI, like Linux and NetBSD.

  2. Lee Fawkes says:

    There is a typo in your “More photos on SIMH site” link. Should be http://simh.trailing-edge.com/photos.html .

    Beyond that: awesome! I look forward to playing with this.

  3. Dan Stromberg says:

    If I boot V7 on pdp11 (SIMH), like so:

    $ pdp11

    PDP-11 simulator V3.8-1
    sim> att rl0 RL02
    sim> att rl0 unix_v7_rl.dsk
    sim> set cpu u18
    Disabling XQ
    sim> boot rl0
    New Boot, known devices are hp ht rk rl rp tm vt
    : rl(0,0)rl2unix
    mem = 177856
    # Restricted rights: Use, duplication, or disclosure
    is subject to restrictions stated in your contract with
    Western Electric Company, Inc.
    Thu Sep 22 08:05:45 EDT 1988

    login: root
    You have mail.

    …then I don’t seem to get a /usr/bin – I have some directories under /usr, but they seem to be actually in the root filesystem – at least, the number of directories in /usr doesn’t change from before multiuser and after entering multiuser.

    Am I doing something wrong?

    Does this distribution only include / and not /usr?

    I’m thinking something’s missing, because I have no vi or cpio commands.

  4. towo says:

    Is there any way to import or export data? Any tool to handle the .dsk image files?

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