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Notes on oskit: 2.11BSD system on a RP06 volume - minimal memory system

General remarks

See notes on

System properties and intended usage

  • patch level is #447 plus fpsim+tcsh patch
  • for history see CHANGELOG.md
  • This system is created for usage on systems with limited memory. The RETRONFPMIN kernel is configured with
    NBUF 40         # only 60 blocks disk cache (usual is 160)
    MAXUSERS 10     # this reduces number of file, process, ... slots
    INET NO         # no networking available
  • The system will boot on as little as 512 kB memory. Will work reasonably with 640 kB if only one or two sessions are active. Usage of tcsh should be avoided because it has a large memory footprint.

Installation

A disk set is available from http://www.retro11.de/data/oc_w11/oskits/211bsd_rpminset.tgz

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

       cd $RETROBASE/tools/oskit/211bsd_rpmin/
       211bsd_rpmin_setup

Usage

  • Start backend server and boot system (see section Rlink in w11a_os_guide)

         boot script:  211bsd_rpmin_boot.tcl
     example:      ti_w11 <opt> @211bsd_rpmin_boot.tcl
                   where <opt> is the proper option set for the board.

    or use for verification the SimH simulator (see section SimH in w11a_os_guide)

    pdp11 211bsd_rpmin_boot.scmd

  • Hit <ENTER> in the xterm window to connnect to backend server. System with as low as 512 kB memory can be used, like in example below. The boot dialog in the console xterm window will look like (required input is in {..}, with {<CR>} denoting a carriage return:

         70Boot from xp(0,0,0) at 0176700
     : {<CR>}
     : xp(0,0,0)unix
     Boot: bootdev=05000 bootcsr=0176700

     2.11 BSD UNIX #2: Thu May 30 12:47:59 PDT 2019
         root@w11a:/usr/src/sys/RETRONFPMIN

     phys mem  = 524288
     avail mem = 313536
     user mem  = 307200

     May 30 12:55:30 init: configure system
     
     dz 0 csr 160100 vector 310 attached
     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:

         #^D
     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:Thu May 30 12:55:43 PDT 2019
     
     
     2.11 BSD UNIX (w11a) (console)
     
     login:

    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}
      16/122 files
      50/128 inodes
      10/ 80 processes
       9/ 36 texts active,  34 used
       6/ 72 swapmap entries,  475 kB used, 3704 kB free, 3673 kB max
      15/ 80 coremap entries,  107 kB free,   43 kB max
       1/ 10  ub_map entries,   25    free,   25    max
     # {mount}
     /dev/xp0a on /
     /dev/xp0c on /tmp
     /dev/xp0d on /home
     /dev/xp0e on /usr
     # {halt}
     syncing disks... done
     halting

    While the system was running the server process display the

         cpu0>

    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: 010330  R2: 056172  R3: 000010
       R4: 005000  R5: 147510  SP: 147466  PC: 000014

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