This is a guide to installing UNIX sixth edition in the simh pdp-11 emulator. Besides the pdp11 emulator you only need the v6 distribution tape: http://www.ba-stuttgart.de/~helbig/os/v6/dist.tap ___________________________________ 1. Step: Installing the binary disc ___________________________________ There are 3 RK05 discs installable from the magtape: -UNIX sixth edition including kernel source code -Source code for the remaining programs -Manuals To install the binary distribution start pdp11: PDP-11 simulator V3.7-0 sim> Now we enter: sim>set cpu 11/40 Disabling XQ sim>set tto 7b sim>att tm0 dist.tap sim>set tm0 locked sim>att rk0 v6root RK: creating new file sim>att rk1 v6src RK: creating new file sim>att rk2 v6doc RK: creating new file This mounts the magtape and creates three RK05 discs. Now type: sim>d 100000 012700 sim>d 100002 172526 sim>d 100004 010040 sim>d 100006 012740 sim>d 100010 060003 sim>d 100012 000777 sim>d pc 100000 sim>go And stop the simulation by pressing Ctrl+E. You just keyed in and executed some machine instructions at 100000. Set the PC to 0 and execute by typing: sim>d pc 0 sim>go You can now copy disc 1 from magtape to rk0. You should see a '=': =tmrk disk offset 0 tape offset 100 count 1 =tmrk disk offset 1 tape offset 101 count 3999 = Exit with Ctrl+E. We will copy the rest to discs when we are running UNIX. _____________________ Step 2: Booting UNIX: _____________________ To boot UNIX, key in and execute at 100000: sim> d 100000 012700 sim> d 100002 177414 sim> d 100004 005040 sim> d 100006 005040 sim> d 100010 010040 sim> d 100012 012740 sim> d 100014 000005 sim> d 100016 105610 sim> d 100020 002376 sim> d 100022 005007 sim> d pc 100000 sim> go You should now see an '@', type "rkunix" and "root": @rkunix login: root # _____________________________ Step 3: Creating device files _____________________________ Welcome to UNIX, now we want to to create special files for the other RK05 discs and the magtape. # chdir /usr/sys/conf # cc mkconf.c # mv a.out mkconf # mkconf tm rk done # This creates l.s and c.c which we will need in order to create the device files. Look at c.c (cat c.c) and you will see that there are two tables. The first is for the block devices, the second for the character devices. To create, say, /dev/rk0 (a block device) we use this command: # /etc/mknod /dev/rk0 b 0 0 Since we want to create a block device (that's what the b stands for), we consult the first table in c.c. The first zero means that we create an rk device, the second tells that the device we're creating is the first of it's kind. When you look at the first table in c.c you will see a comment in the first line, /* rk */, this is why the first number is 0. For tm we are going to use 3, just count lines starting with zero. The second 0 tells mknod that we want the first RK05 disc. To create a character device for rk0 type: # /etc/mknod /dev/rrk0 c 9 0 Now that we create a character device the first table of c.c does no longer apply and we must use the second. Here the rk device has the identifier 9. Furthermore we have to use c rather than b to tell mknod we want a character device. Creating rk1 and rk2, and rrk1 and rrk2 respectively should not be a problem now: # /etc/mknod /dev/rk1 b 0 1 # /etc/mknod /dev/rrk1 c 9 1 # /etc/mknod /dev/rk2 b 0 2 # /etc/mknod /dev/rrk2 c 9 2 To create mt0 and rmt0 we'll just lookup everything we need in the tables. This is what we end up with: # /etc/mknod /dev/mt0 b 3 0 # /etc/mknod /dev/rmt0 c 12 0 _________________________________ Step 4: Copy discs and mount them _________________________________ Finally we can copy the source and doc discs from magtape: # dd if=/dev/mt0 of=/dev/rk1 count=4000 skip=4100 # dd if=/dev/mt0 of=/dev/rk2 count=4000 skip=8100 You can now mount them to /usr/source and /usr/doc (needs to be created): # /etc/mount /dev/rk1 /usr/source # mkdir /usr/doc # /etc/mount /dev/rk2 /usr/doc If you want the discs to be mounted at startup follow these instructions: # ed /etc/rc 28 2 /etc/update a /etc/mount /dev/rk1 /usr/source /etc/mount /dev/rk2 /usr/doc . w 89 q # ________________ Additional help: ________________ _______________________ Adding the "cd" command _______________________ You probably noticed that UNIX sixth edition doesn't have cd so you have to use chdir every time, this is pretty annoying so we are going to fix that: # chdir /usr/source/s2 # ed sh.c 11594 561 if(equal(cp1, "chdir")) { s/equal(cp1, "chdir")/equal(cp1, "chdir") || equal(cp1, "cd")/p if(equal(cp1, "chdir") || equal(cp1, "cd")) { w mysh.c 11614 q # cc mysh.c # mv /bin/sh /bin/sh_org # mv a.out /bin/sh # sh Now you can use cd and chdir to change you working directory. ______________________ Recompiling the Kernel ______________________ You may want to recompile your kernel. To accomplish this cd to /usr/sys: # cd /usr/sys and execute run # sh run This will recompile you kernel and install it. You could use your preferred kernel (rkunix for simh) as kind of a default kernel with: # cd / # cp rkunix unix You can now boot UNIX from the '@' Bootprompt with "@unix". _________________________ Writing a simh batch file _________________________ To boot unix with "pdp11 unix.sim" we create a file with all simh commands that boot UNIX: unix.sim: set cpu 11/40 set tto 7b att rk0 v6root att rk1 v6src att rk2 v6doc boot rk0 To exit use Ctrl+E and quit. I hope I could help you with this great System :) kotzkroete@gmail.com