[TUHS] 1972 UNIX V2 "Beta" Resurrected

[Yufeng Gao via TUHS]

Hi,

So I've tested SIMH again with my reconstructed RF disk image, and this time it worked. I must have used the s1 kernel and the unix-june72 init(7) when I previously tested it, my bad.

sim> dep system sr 173700
sim> go 173700

:login: root
root
# ls -la
total   42
 41 sdrwrw  7 root     80 Jan  1 00:02:02 .
 41 sdrwrw  7 root     80 Jan  1 00:02:02 ..
 43 sdrwrw  2 root    620 Jan  1 00:01:30 bin
147 l-rwrw  1 root  16448 Jan  1 00:33:51 core
 42 sdrwrw  2 root    250 Jan  1 00:01:51 dev
 49 sdrwrw  2 root    110 Jan  1 00:01:55 etc
 54 sdrwrw  2 root     50 Jan  1 00:00:52 tmp
 55 sdrwrw  7 root     80 Jan  1 00:00:52 usr
#

It's great that it works under SIMH... However, this still does not help with installing this version of UNIX the intended way. The intended way is to boot from the s1 tape, which would load the cold kernel, initialise the RF, and provide you with a minimal set of tools so that you could use tap(1) to restore the distribution from the s2 tape. The showstopper here is the s1 tape - it is missing /etc/passwd, so you will not be able to login when booted from s1.

sim> dep system sr 1
sim> boot tc0

HALT instruction, PC: 000414 (JSR R0,10762)
sim> c

:login: root
root
Can't open password file

:login:

Since you can't login, there's not much you can do :(. For now, my hand-rolled RF disk image is the only way to get a working copy. My SIMH config file:

set cr disabled
set xq disabled
set rk disabled
set hk disabled
set rha disabled
set tm disabled
set rx disabled
set rl disabled
set tq disabled
set dci disabled
set cpu 11/20
set cpu 32K
set ke enabled
set rf 2p
set rf enabled
att rf s1s2unix_rf.img         <-- RF disk image
set tc enabled
set tc locked
att tc s1.itp                  <-- s1 tape
load m792low.load              <-- Modified UNIX ROM from unix-june72 project
dep system sr 173700
go 73700                       <-- Low address used by the modded ROM


P.S. This kernel is unmodded, which means it supports only LF, not CR, so use ^J for ENTER.

Sincerely,
Yufeng