Hi Glen, many thanks. Problem was, that I had no clue, how to bypass the error to enter the setup mode. As Ctrl C was not working. I have in the meantime found in the KDJ11-D/S dokumentation, that (CTRL + O) (4) Enter" do it. Now I have set all setup parameters to the same as on the working KDJ11-B and it boots up without errors. Here my parms: Type a command then press the RETURN key: 2 List/change parameters in the Setup table A - ANSI Video terminal (1) 0=No, 1=Yes = 1 B - Power up 0=Dialog, (1)=Automatic, 2=ODT, 3=24 = 1 C - Restart 0=Dialog, (1)=Automatic, 2=ODT, 3=24 = 1 D - Ignore battery 0=No, 1=Yes = 0 E - PMG 0-(7) 1=.4us, 2=.8, 3=1.6, 4=3.2,...7=25.6 = 7 F - Disable clock CSR 0=No, 1=Yes = 0 G - Force clock interrupts 0=No, 1=Yes = 0 H - Clock 0=Power supply, 1=50Hz, 2=60Hz, 3=800Hz = 1 I - Enable ECC test (1) 0=No, 1=Yes = 1 J - Disable long memory test 0=No, 1=Yes = 0 K - Disable ROM 0=No, 1=Dis 165, 2=Dis 173, 3=Both = 0 L - Enable trap on Halt 0=No, 1=Yes = 0 M - Allow alternate boot block 0=No, 1=Yes = 1 N - Disable Setup mode 0=No, 1=Yes = 0 O - Disable all testing 0=No, 1=Yes = 0 P - Enable Unibus memory test (1) 0=No, 1=Yes = 0 Q - Disable UBA ROM 0=No, 1=Yes = 0 R - Enable UBA cache (1) 0=No, 1=Yes = 1 S - Enable 18 Bit mode 0=No, 1=Yes = 0 The trick was Parm "H" which was set to "0". Many Greetings Ulrich On Mon, Feb 1, 2016 at 12:24 PM, Ulrich Tagge<u.tagge at gmx.de <http://www.classiccmp.org/mailman/listinfo/cctech>> wrote: />/ />/ I have a working 11/84, and I have decidec, to test some of my spare cards, />/ starting with: KDJ11-B. />/ />/ I see the following error, when powering up the system, which points me to />/ the Clock. />/ />>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>/ />/ Error 61 />/ M8190 clock Error />/ />/ Any hints, what the problem could be? Is the clock in this new PDP's still />/ generated out of the line frequency? Could it by, that the KDJ11-B is />/ configured to a wrong HZ value? / If you have one M8190 KDJ11-B which works fine and another one which has this error when swapped into the same system you should check the EEPROM configuration options between the two and see if the LTC options are configured differently between the two. http://www.bitsavers.org/pdf/dec/pdp11/1173/EK-KDJ1B-UG_KDJ11-B_Nov86.pdf 2.3 EEPROM CONFIGURATION PARAMETERS Table 2-6 Configuration Parameters H - Disable clock CSR (0)=No (1)=Yes I - Force clock interrupts (0)=No (1)=Yes J - Clock frequency (0)=Power supply (1)=50Hz (2)=60Hz (3)=800Hz If the LTC parameters are configured differently between the two try changing the parameters of the non working one to match the parameters of the working one.