Initial commit of 2.11BSD disk image and instructions.

[pdp11-211bsd-simh] / README.md

# Overview #

The `211bsd_simh` directory contains a working 2.11BSD disk image that can be
booted using the included SIMH config file. Simply execute `simh system.conf`
from within the `211bsd_simh` directory. Don't forget to `gunzip` the disk
image file before use.

If you need help installing/configuring SIMH, see my notes on installing SIMH
located at
<https://subgeniuskitty.com/development/pdp11/software_development/modern_unix>.

If your console looks like the contents of the files in `7bit-encoding`, make
sure the line `set tto 7b` is not commented out in `211bsd_simh/system.conf`.

The files in `211bsd_install_tape` are a BSD install tape image and a PDF
describing how to use it.


# Status #

Tested and working. This image runs regularly in SIMH and a real PDP-11.


# Instructions #

Clone the repository and un-gzip the disk image.

    git clone git://git.subgeniuskitty.com/pdp11-211bsd-simh
    cd pdp11-211bsd-simh/211bsd_simh
    gunzip disk0_ra90_211bsd.dsk.gz

From within the same directory, execute `pdp11 system.conf` to begin the
simulation using SIMH.

    PDP-11 simulator V3.9-0
    Disabling CR
    Disabling RK
    Disabling HK
    Disabling TM
    
    73Boot from ra(0,0,0) at 0172150
    : 

This bootloader was loaded from block `0` of the first MSCP compatible disc
device, which, per `system.conf`, is the file `disk0_ra90_211bsd.dsk`. This
bootloader is sophisticated enough to load the UNIX kernel, but we have to tell
it what device and file to load. Type `ra(0,0,0)unix` and press Enter to
proceed.

    : ra(0,0,0)unix
    Boot: bootdev=02400 bootcsr=0172150
    
    2.11 BSD UNIX #1: Sat Aug 11 20:38:20 PDT 2018
        root@curly.2bsd.com:/usr/src/sys/KRYTEN-NONET
    
        ra0: Ver 3 mod 3
        ra0: RA90  size=2376153
    
        phys mem  = 4186112
        avail mem = 3990464
        user mem  = 307200
    
        August 12 00:01:47 init: configure system
    
        ra 0 csr 172150 vector 154 vectorset attached
        cn 1 csr 176500 vector 300 skipped:  No CSR.
        cn 2 csr 176510 vector 310 skipped:  No CSR.
        cn 3 csr 176520 vector 320 skipped:  No CSR.
        cn 4 csr 176530 vector 330 skipped:  No CSR.
        erase, kill ^U, intr ^C
        # 

The computer has now booted up to single-user mode and you are logged in as
root. Unless you need to perform an operation in single-user mode, press
`Ctrl-D` here to logout and let startup continue.

        # Fast boot ... skipping disk checks
        checking quotas: done.
        Assuming non-networking system ...
        checking for core dump...
        preserving editor files
        clearing /tmp
        standard daemons: update cron accounting.
        starting lpd
        starting local daemons: sendmail.
        Sun Aug 12 00:01:53 PDT 2018
    
    
        2.11 BSD UNIX (curly.2bsd.com) (console)
    
        login: 

2.11BSD is now booted into multi-user mode. Login with username `root` and
password `temppass` to get started.

To shut down, as `root`, type `sync; sync; halt` to flush any buffers and halt
the PDP-11 simulation. Then, type `quit` at the `sim>` prompt to exit SIMH.

        login: root
        Password:
        erase, kill ^U, intr ^C
        # sync; sync; halt
        syncing disks... done
        halting
    
        HALT instruction, PC: 000014 (MOV #1,10544)
        sim> quit
        Goodbye

Note that you can always halt the simulation and return control to SIMH by
pressing `Ctrl-e` at any time. This drops to the `sim>` prompt. Entering `go`
will resume simulation where it paused.