[...] [...] Time for a reality check now! The machine runs! DCLO and ACLO is not the problem. What is the problem is a total hang when trying to access the DL11. The question is if he can access the I/O page at all. I haven't heard any confirmation if it is possible to read from the bootstrap code locations. They are also in the I/O page, and thus is a very interesting test. PAUSE goes on when you start boot, but that don't tell us enough. The boot roms don't access the console, so we atleast know that the DL11 isn't the only problem. I suspect you have problems accessing the I/O page in general. But can you access the MMU registers, and other processor registers at the I/O page? And still, NPR might be the problem. If I remember correctly, a broken NPR might show up just like this. The same goes for the BG lines. Remove and reinsert the grant cards, check the I/O page more. You have access to memory, and can run programs, so let's skip the stuff that we know is working correctly. Johnny Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt(a)update.uu.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol