KFQSA Resolution - at last

Hello everyone, The KFQSA has got to be one of the _weirdest_ boards DEC ever made to control disks. Some data points: KFQSA Switch Table (Normal Operation) Switch 1 2 3 4 CSR Address in Octal --- --- --- --- ------------------------- ON ON ON ON 0760444 (Secondary TMSCP) < tape controller ON ON ON OFF 0774500 (Primary TMSCP) < tape controller ON ON OFF ON 0760334 (Secondary MSCP) < Disk controller * ON ON OFF OFF 0772150 (Primary MSCP) < Disk Controller KFQSA Switch Table (When being programmed) Switch 1 2 3 4 CSR Address in Octal --- --- --- --- ------------------------- * ON OFF ON ON 0774420 (service 0) ON OFF ON OFF 0774424 (service 1) ON OFF OFF ON 0774430 (service 2) ON OFF OFF OFF 0774434 (service 3) To configure the board to support two DSSI drives as I have, you first put the KFQSA into "service mode" (ON-OFF-ON-ON) then power cycle and at the uVAX chevron type: If you have correctly set the switches on the KFQSA it will respond with a program : UQSSP Controller (774420) Enter SET, CLEAR, SHOW, HELP, EXIT, or QUIT Node CSR Address Model 0 760444 22 1 760354 21 2 760360 21 6 ------ KFQSA ------ ? help Commands: SET <node> /KFQSA set KFQSA DSSI node number SET <node> <CSR_address> <model> enable a DSSI device CLEAR <node> disable a DSSI device SHOW show current configuration HELP print this text EXIT program the KFQSA QUIT don't program the KFQSA Parameters: <node> 0 to 7 <CSR_address> 760010 to 777774 <model> 21 (disk) or 22 (tape) ? I enable two disk drives telling it that unit 1 is on the first controller and unit 2 is on the second. ? set 0 772150 21 ? set 1 760334 21 Now type 'EXIT' (and this saves that config) change the switches to select primary MSCP (on-on-off-off) and restart. Now the system powers up and shows two MSCP controllers (even though there is just the one) and DUA0: is on one, and DUB1: is on the other. I don't know if I can make both drives show up on one controller. That will require a bit more experimentation. --Chuck