Well, either that was transcribed incorrectly, or the person who wrote it confused. On the M8192, per EK-KDJ1A-UG-002, pg. 2-1, W_5_ is the halt trap option, and W9 is... BEVENT recognition. One removes W9 to enable the LTC (using the QBUS BEVNT line). Which kind of explains your results... :-) Noel PS: BTW, the M8190 (KDJ11-B) in similar - the onboard ROM diagostics barf if the LTC isn't on (i.e. the switch on the chassis to enable BEVNT has to be on).