I know it's bad for to follow-up your own messages but.. The DG appeared to fire up correctly after the fitting of a correct plug, however all the lights turned on with no signs of life from the CPU. I pulled out the CRO to see if there was any clocks etc on the bus, and whilst checking this out, all the light mysteriously went off, never to return. The pwr supply is running, but there appear to be about 15 fuses in this damn thing, of which about half are open, so I'll replace most of them and see if it remidies the situation. As for the LSI-11, I plugged the basic cards in (CPU/Memory) and the KDJ-11A reported "No SLU" on the diag lights, so far so good, so I plugged the rest of the cards in,including the oddball CTBC card, which had some kind of strange home-built relay contraption on the front of it with apporpriate matching plugs in the main unit. Of course the moment i switched it on I got the blue flash of death and the supply fuse opened, and two resistors on that card went to heaven, _hopefully_ without damaging the rest of the bus. It appears that somehow this thing was to control some kind of equipment, but failed and dumped god-knows-what into the card instead, (I'm really hoping nothing else is damaged, it doesn't appear to be). Important lesson learned. Regards Karl