RS/6000 7043-140 boot floppies

On Feb 18, 2019, at 11:49 AM, Alan Perry via cctech <cctech at classiccmp.org> wrote: Is there some trick to making boot floppies for the RS/6000 7043-140 (a mid-90s PReP architecture machine)? I initially tried to install Solaris 2.5.1 on it and created the boot floppy by dd'ing the image using a SPARCstation (running NetBSD). I dd'ed the image over, dd'ed it back and verified the SPARCstation could read back what it had written to the floppy. The RS/6000 loads what is on the floppy, but hangs transferring control to what it loaded. The 7043-140 does not appear on the list of supported systems in the Solaris 2.5.1 release notes, so, even though 2.5.1 supports PReP and the 7043-140 is a PReP machine, maybe they aren't compatible, so I tried NetBSD. The 7043-140 is listed as a supported system. The NetBSD boot floppy images are confusing to me. The files are too large to fit on a 1.44M floppy. I didn't see instructions on how to make boot floppies out of the .fs files one can download in the install instructions. I went ahead and tried to dd the part that fits onto a 1.44M floppy and try to boot that and of course that failed. I have e-mailed the NetBSD prep mailing list and no response from that. The system does boot the AIX install on one of its hard disks, but this is a recycled system and I don't have usernames/passwords for that install. Does anyone here have a suggestion on how to proceed? alan CAUTION: This email originated from outside SwRI and it may contain attachments and/or links. Do not open attachments or click on links unless you recognize the sender and know the content is safe.