11/45 RTC

I do not have DL11-W prints alas. Maybe I should start from the beginning and re-explain the problem as I percieve it. The machine boots xxdp+ v1.0 and 2.5 just fine. However, when I try to boot RT11, the lights flicker and the disk flickers for about 10 seconds, and then the system just halts. Because of the fact the system can read and write full disk packs using VTserver, I kinda doubt there is a major read/write problem with the drive. I am GUESSING that what is happening is that xxdp does not use interrupts for anything, nor does vtserver. My GUESS is that RT11 does, and that there is something wrong with interrupts on my machine. I am GUESSING that at some point in the boot process of RT11 it tries to use interrupts and thus my machine just dies there. I centered on the LTC as a possible route to investigate for two reasons - one, I was under the impression that the LTC signal had to be present for interrupts to work, and if it wasn't, I'd get this behaviour, and two - because when I run the diagnostic program for the DL11-W, it specifically complains about the LTC part of the DL11-W with "Bit 7 never sets". Sooooo long story short, I wanted to make sure the LTC and interrupts were working, then try rebooting RT11 and see if that was the issue. Bear in mind I have three DL11-W cards. I guess it's possible, but I find it hard to believe they are all bad (although they do fail the diagnostic in different ways). I've also tried several different RL11 controllers, and I've triple checked the NPG jumpers and grant cards. Maybe I should be looking in a different direction. I am going to go back and run the trap and interrupt tests tomorrow, I believe the machine fails the interrupt test. Jay