The following info can be found at the Metalab PDP-11 archive, but I've included it here. Zane http://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/hardwar… SD.txt W1 is the 4-switch pack near the fingers SW2 is the ten-switch pack SW3 is the remaining 4-switch-pack near the handles Setting the CSR: (only one on at a time) LSI-11 Microvax II SW2-10 on 17772150 20001468 SW2-9 on 17760334 200000DC SW2-8 on 17760354 200000EC SW2-7 on 17760374 200000FC SW2-6 on 17760414 2000010C SW2-5 on 17760434 2000011C Bootstrap select (only one on at a time): SW2-3 on On board bootstrap disabled SW2-2 on On board bootstrap enabled at 17773000 SW2-1 on On board bootstrap enabled at 17771000 Drive configuration: SW3-2 SW3-3 SW3-4 Function On On On All drives fixed media On Off On Drive 0 removable On On Off Drives 0 and 1 removable On Off Off Drives 0, 1, and 2 removable Off On On Drives 0,1,2, and 3 removable Off Off Off Enable WOMBAT via on-board port SW3-1 is unused and should be left on Interrupt Priority: SW1-2 SW1-3 SW1-4 Priority On On On 4 On On Off 5 On Off On 6 Off Off On 7 SW1-1 is unused Maintenenace Terminal Adapter, 10-pin port: 9600 baud, 8 data bits, 1 stop bit J6 DB25S Function 7 7 RS232 Enable 8 2 RS232 Input 3 3 RS232 Output 4 7 Ground Starting WOMBAT over the console on a LSI-11: Halt the processor. 0/0 0g 'CSR'/250 R7/2000 RS/340 P Microvax II: Halt the processor U I D/P/W 20001F40 20 D/L 20088008 80000002 D/W 2000xxxx AC ("xxxx" is the last 4 digits from Microvax CSR table) S 400 | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)aracnet.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |