Installing UNIX v6 (PDP-11) on SIMH

I'm going to try to describe the install procedure used by Tim Newsham for Unix v6 on the PDP-11/40.

Materials

I'm going to expect you to have the SIMH emulator, 3.8-1 or higher, and a Unix v6 tape Unix-v6-Ken-Wellsch.tap

Tape boot

Here we load the bootblock and load up the root partition onto the rk disk file...

First the tboot.ini file:

set cpu 11/40
set tm0 locked
attach tm0 dist.tap
attach rk0 rk0
attach rk1 rk1
attach rk2 rk2
d cpu 100000 012700
d cpu 100002 172526
d cpu 100004 010040
d cpu 100006 012740
d cpu 100010 060003
d cpu 100012 000777
g 100000

Once this is run, the simulation will 'lock', hit CTRL+E to break the emulation, and then execute the stand alone program to prepare the hard disk. Type in:

g 0

And the stand alone program will be ready to respond. Here is my install session:

PDP-11 simulator V3.8-1
sim> set cpu 11/40
Disabling XQ
sim> set tm0 locked
sim> attach tm0 dist.tap
sim> attach rk0 rk0
RK: creating new file
sim> attach rk1 rk1
RK: creating new file
sim> attach rk2 rk2
RK: creating new file
sim> d cpu 100000 012700
sim> d cpu 100002 172526
sim> d cpu 100004 010040
sim> d cpu 100006 012740
sim> d cpu 100010 060003
sim> d cpu 100012 000777
sim> g 100000

Simulation stopped, PC: 100012 (BR 100012)
sim> g 0
=tmrk
disk offset
0
tape offset
100
count
1
=tmrk
disk offset
1
tape offset
101
count
3999
=
Simulation stopped, PC: 137300 (BGE 137274)
sim> q
Goodbye

disk install

Here is our dboot.ini for booting from the hard disk:

set cpu 11/40
set tto 7b
set tm0 locked
attach tm0 dist.tap
attach rk0 rk0
attach rk1 rk1
attach rk2 rk2
dep system sr 173030
boot rk0

And this will boot us up to the bootloader, to which we just tell it to load the 'unix' kernel.

PDP-11 simulator V3.8-1
sim> set cpu 11/40
Disabling XQ
sim> set tto 7b
sim> set tm0 locked
sim> attach tm0 dist.tap
sim> attach rk0 rk0
sim> attach rk1 rk1
sim> attach rk2 rk2
sim> dep system sr 173030
sim> boot rk0
@unix
mem = 1030
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