RQDX3 as third controller under RT-11

OK, it looks like I figured out why I've not been able to get the RX50's on my PDP-11/73 working, dead RQDX3. Of course it's my only one that can handle RX33's, thankfully I'm more interested in RX50's. Anyway, I've got a problem, and part of it might be what a mutant beast this system is. If I have DU7: set to one of the drives on the RX50 the system crashes after 1 minute (I actually timed this, and it was so close to 1 minute it was disturbing). I've not tried any other combo's of setting the RX50 in the system, but don't see why that would matter. The thing really wierd about this system, and one of the main reasons I call it a mutant beast is the following: Controller CSR Vector Purpose Viking QDT 172150 154 Both Hard Drives are on this board WQESD 160334 150 Bootstrap (that's all it does) RQDX3 160354 144 RX50 DU0: is set UNIT=0, PART=0, PORT=0 (Boot Disk) DU1: is set UNIT=1, PART=0, PORT=0 (Backup Boot Disk) DU2: is set UNIT=0, PART=1, PORT=0 DU3: is set UNIT=0, PART=2, PORT=0 DU4: is set UNIT=1, PART=1, PORT=0 DU5: is set UNIT=1, PART=2, PORT=0 DU6: is set UNIT=0, PART=3, PORT=0 DU7: is set UNIT=0, PART=0, PORT=2 After one minute, I get the following: . 134606 @ I think it's always at 134606, but the minds a little fuzzy at the moment, I'm working on this while working on problems at work, and it's just a little late. Anyone have any ideas? My plan is to normally have DU7: set to PART=3 of UNIT=1, and only switch it to the RX50 when I need to use a floppy drive. In the mean time, I think I'll have to give that Codar clock a try. Zane | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)aracnet.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |