http://squoze.net/UNIX/v4/README

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squoze.net


  * > B/
  * > C/
  * > NB/
  * >> UNIX/
  * 
      + > 32v/
      + > V6 on rl01
      + > bltj/
      + > fs/
      + > restored/
      + > sysIII pdp11/
      + > sysIII vax/
      + > sysV pdp11/
      + > v1man/
      + > v2man/
      + > v3man/
      + >> v4/
      + 
          o >> README
      + > v4man/
      + > v5/
      + > v5man/
      + > v6/
      + > v6man/
      + > v7/
      + > v8/
  * > ling/
  * > math/
  * > misc/
  * > plan 9/

UNIX Fourth Edition

Here you can find the contents of the UNIX v4 tape ready for
bootstrapping, including a tar file of the filesystem.

  * unix_v4.tap is the original tape file in simh format
  * bootstrap are the first 38400 bytes of the tape
  * disk.rk is the rest of the tape, an RK05 image
  * unix_v4.tar is the filesystem extracted
  * install.ini is an ini file for simh to install the system
  * boot.ini is an ini file for simh to boot the system

At first I extracted the disk image manually from the tape, which
resulted in bootstrap and disk.rk. These are really nothing more than
the first 38400 bytes of the raw tape content and the rest. Because
unix_v4.tap is block based, one first has to strip it of its block
sizes to get the raw content.

Actually it's easier to just use the tape as it is and install a new
system from it.

Installing the system

To install the system we just dump an RK05 disk image from tape to
disk:

% pdp11 install.ini

[...]
        ; boot from TM0, now in mboot
=list
dldr
dtf
list
mboot
mcopy
rkf
tboot
uboot
=mcopy
'p' for rp; 'k' for rk
k
disk offset
0
tape offset
75
count
4000
=

Afterwards, we can just load uboot from tape to start UNIX:

=uboot
k
unix
mem = 64530

login: root
# ls
bin
dev
etc
lib
mnt
tmp
unix
usr
# sync
# sync
# sync
# ^E        ; end emulation

Running the system

To boot the system we don't need the tape. Instead, we load uboot
directly from the boot sector. We specify k for RK05, then the
filename unix.

% pdp11 boot.ini

[...]
        ; boot from RK0, now in uboot
k
unix
mem = 64530

login: root
#

Rebuilding the kernel

Put the following into /usr/sys/run:

rm -f low.o mch.o conf.o lib1 lib2

chdir ken
cc -c *.c
sh mklib
rm *.o

chdir ../dmr
cc -c *.c
sh mklib
rm *.o

chdir ..
cc -c conf/conf.c
mv conf/conf.o conf.o
as conf/low.s
mv a.out low.o
as conf/mch.s
mv a.out mch.o
ld -x low.o mch.o conf.o lib1 lib2

/usr/sys/ken/mklib:

ar r ../lib1 main.o
ar r ../lib1 alloc.o
ar r ../lib1 iget.o
ar r ../lib1 prf.o
ar r ../lib1 rdwri.o
ar r ../lib1 slp.o
ar r ../lib1 subr.o
ar r ../lib1 text.o
ar r ../lib1 trap.o
ar r ../lib1 sig.o
ar r ../lib1 sysent.o
ar r ../lib1 sys1.o
ar r ../lib1 sys2.o
ar r ../lib1 sys3.o
ar r ../lib1 sys4.o
ar r ../lib1 nami.o
ar r ../lib1 fio.o
ar r ../lib1 clock.o

/usr/sys/dmr/mklib:

ar r ../lib2 bio.o
ar r ../lib2 tty.o
ar r ../lib2 malloc.o
ar r ../lib2 pipe.o
ar r ../lib2 cat.o
ar r ../lib2 dc.o
ar r ../lib2 dn.o
ar r ../lib2 dc.o
ar r ../lib2 dn.o
ar r ../lib2 dp.o
ar r ../lib2 kl.o
ar r ../lib2 mem.o
ar r ../lib2 pc.o
ar r ../lib2 rf.o
ar r ../lib2 rk.o
ar r ../lib2 tc.o
ar r ../lib2 tm.o
ar r ../lib2 vs.o
ar r ../lib2 vt.o
ar r ../lib2 partab.o
ar r ../lib2 rp.o
ar r ../lib2 lp.o
ar r ../lib2 dhdm.o
ar r ../lib2 dh.o
ar r ../lib2 dhfdm.o

Then in /usr/sys:

# sh run
alloc.c:
clock.c:
fio.c:
iget.c:
main.c:
nami.c:
prf.c:
rdwri.c:
sig.c:
60: Warning: assignment understood
61: Warning: assignment understood
slp.c:
subr.c:
sys1.c:
sys2.c:
sys3.c:
sys4.c:
sysent.c:
text.c:
trap.c:
bio.c:
cat.c:
dc.c:
dh.c:
dhdm.c:
dhfdm.c:
dn.c:
dp.c:
dv.c:
kl.c:
lp.c:
malloc.c:
mem.c:
partab.c:
pc.c:
pipe.c:
rf.c:
rk.c:
rp.c:
tc.c:
tm.c:
tty.c:
vs.c:
vt.c:
#

Now install and boot the new kernel:

# mv a.out /nunix
# sync
# sync
# sync
# ^E
Simulation stopped, PC: 002040 (MOV (SP)+,177776)
sim> b rk
k
nunix
mem = 64529

login: root
#

TODO

There are a bunch of other things I would like to document (or do in
the first place):

  * automatic installation (expect)
  * configure kernel (/dev/mem missing)
  * add device files
  * add man pages (but no nroff, v6?)
  * try rp disk
  * try rf swap (ps assumes rf0)

Reconstruction:

  * get pre-v4 nsys kernel to work (buffer handling seems broken, i
    suspect synchronization bugs)
  * get B restoration to work

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