Hi, Last year I rescued a dual-wide 8-position q-bus backplane. I added the wire wrap to convert it from 18 to 22-bit, and now can boot BSD2.11 from CMD/CQD SCSI controller and CF card at DU0, via an AztecMonster CF-SCSI adapter. If I remove the SCSI controller, I can boot XXDP from an RQDX3 connected floppy drive at DU0. My CPU is an M8192 from the scrap-card guy on e-bay, and I'm using an M7195 SLU/ROM card for console. It's got 23-14534/23-146E4 ROMs. I'm using a 2MW Clearpoint RAM card. I'm fabricating a cool desktop flexiglass case, so I can put the tiny-pdp11/73 on the desk at work.
The difficulty I am having is I would like to configure the system with both MSCP controller cards installed, so I can boot from either SCSI or floppy, preferably with the SCSI still starting at DU0 so my BSD2.11 CFs remain portable to my other system. I changed the W1-W11 jumpers on the RQDX3 for 17760334 secondary MSCP address. And, I installed W12 to start at MSCP unit number 4. I used the menu on the SCSI controller to set it for DU0-DU3-only device mappings (SCSI ID 0-3). My understanding is each controller needs the different CSR, and non-overlapping MSCP unit numbers. I confirmed I (finally) got the RQDX3 address jumpers because the bootrom memory map now displays 17760334-17760336 as in use, as well as 17772150-17772152 for the SCSI controller. I was expecting that I'd now be able to boot from the floppy at DU4 (BOOT> DU 4), but after a long pause, I get ?BOOTROM-F- DU 4 device error. I also tried "BOOT> 17760334 DU 4", but still no joy. Another oddness I noted was that with my original RQDX3 config, if I plug the M7516 ethernet card in, that breaks booting from floppy. Are there some other jumper changes I need to make on the RQDX3? Does anyone have any other suggestions about what I might be doing wrong? Mark -- Mark G. Thomas (m...@misty.com), KC3DRE
