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Notes on oskit: 2.11BSD system on RK05 volumes

General remarks

See notes in on

  1. I/O emulation setup
  2. FPGA Board setup
  3. Rlink and Backend Server setup
  4. Legal terms

For history see


A disk set is available from

Download, unpack and copy the disk images (*.dsk), e.g.

    cd $RETROBASE/tools/oskit/211bsd_rk/
    tar -xzf 211bsd_rkset.tgz


  • Start backend server and boot system (see section Rlink in

         boot script:  211bsd_rk_boot.tcl
         example:      ti_w11 <opt> @211bsd_rk_boot.tcl
                       where <opt> is the proper option set for the board.
  • Hit <ENTER> in the xterm window to connnect to backend server. The boot dialog in the console xterm window will look like (required input is in {..}, with {<CR>} denoting a carriage return:

         70Boot from rk(0,0,0) at 0177404
         : {<CR>}
         : rk(0,0,0)unix
         Boot: bootdev=03000 bootcsr=0177404
         2.11 BSD UNIX #27: Sat May 20 22:55:12 PDT 2017
         phys mem  = 3932160
         avail mem = 3577856
         user mem  = 307200
         May 20 23:02:13 init: configure system
         dz ? csr 160100 vector 310 skipped:  No CSR.
         lp 0 csr 177514 vector 200 attached
         rk 0 csr 177400 vector 220 attached
         rl 0 csr 174400 vector 160 attached
         tm 0 csr 172520 vector 224 attached
         xp 0 csr 176700 vector 254 attached
         cn 1 csr 176500 vector 300 attached
         erase, kill ^U, intr ^C

    In first '#' prompt the system is in single-user mode. Just enter a ^D to continue the system startup to multi-user mode:

         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:Sat May 20 23:02:20 PDT 2017
         May 20 23:02:20 init: kernel security level changed from 0 to 1
         2.11 BSD UNIX (w11a) (console)

    The login prompt is sometimes mangled with system messages, if its not visible just hit <ENTER> to get a fresh one.

         login: {root}
         erase, kill ^U, intr ^C

    Now the system is in multi-user mode, daemons runnng. You can explore the system, e.g. with a pstat -T or a mount command. The second xterm can be activated too, it will connect to a second emulated DL11. At the end is important to shutdown properly with a halt:

         # {pstat -T}
           7/186 files
          39/208 inodes
          11/150 processes
           6/ 46 texts active,  28 used
           2/135 swapmap entries,  366 kB used, 2069 kB free, 2063 kB max
          33/150 coremap entries, 2960 kB free, 2867 kB max
           1/ 10  ub_map entries,   10    free,   10    max
         # {mount}
         /dev/rk0h on /
         /dev/rk2h on /tmp
         /dev/rk3h on /bin
         /dev/rk4h on /usr
         # {halt}
         syncing disks... done

    While the system was running the server process display the


    prompt. When the w11 has halted after 211bsd shutdown a message like

         CPU down attention
         Processor registers and status:
           PS: 030350 cm,pm=k,u s,p,t=0,7,0 NZVC=1000  rust: 01 HALTed
             R0: 177560  R1: 161322  R2: 053436  R3: 000010
             R4: 003000  R5: 147510  SP: 147466  PC: 000014

    will be visible. Now the server process can be stopped with ^D.


  • absolute minimal system !! Not for practical use !!
  • was useful at a time when w11a had only RK11 type disk support
  • /tmp stays on '/'
  • /home is not mounted
  • suitable for a 'root' user, other accounts not supported