I have the RX50 connected through the BA23 back panel. I have reseated all the cables and tried a different cable from the back panel to the RX50. I haven't tried the replacing the large cable that goes to the RQDX3 yet.
I actually have 2 RX50 and both do exactly the same thing. I haven't cleaned any heads yet but, all 4 sets would have to be crummed up to all do the same thing. Possible but, seems an outside chance. I've tried all sorts of floppy disks in every slot. Always the same NO DISK error.
I have basically been working off this guide in creating boot disks:
http://www.employees.org/~kirk/page0204.html#xxdprx50 but, he left off all his SimH config stuff so I have had to figure out a few things. I have also downloaded what were supposed to be bootable RT11 disk images you could just copy over with putr and "copy/file/dev" and should be bootable. They all acted the same as any random floppy even it was blank.
I have tried three different 1.2mb 5.25" drives on the Pentium box I am using to write the images. Doesn't seem to matter. However it is still the same floppy controller.
As a test I downloaded a RX50 RT11 bootdisk image. Mounted it in SimH and it booted fine. I then wrote it out to a floppy with putr. I tried it in the RX50 and got the same NO DISK error. I put it back in the PC and used putr to copy the disk to a new image. I then mounted the new image in SimH and it booted just like the original a floppy copy and image removed.
If I put the floppies in the wrong way the drive wont access them. No red access light at all. Just straight to the NO DISK error. Pretty sure I have them in the right way. Unless of course you have to write them upside down on the pc end of things. I missed that if that's the case.
This is a continuation of the MXV11-B saga but, I think it's unrelated. I actually had all this happen with the 11/73 and MXV11 and now I just repeated everything with a 11/23+ cpu instead because the boot rom is way less annoying and way faster than that MXV11 deal. I get the same results though.I guess I'll try the one other BA23 I have next.
I have two different RQDX3. One out of a MV2 and the other was out of this MicroPDP-11 system. Both do the same thing. Both have default jumper settings.
I guess the main problem is I don't have a known good working boot disk and I don't know if either of these RX50 drives are good. The other problem is that these boxes are so loud that I can't hear if the drive is doing anything other than flashing a a LED. I have tried a few times now and, even with my ear next to floppy drive, I can't hear anything over the roar of the fans.