On Sat, Feb 16, 2019 at 10:53 AM Charles Anthony <charles.unix....@gmail.com> wrote:
> > > On Sat, Feb 16, 2019 at 10:04 AM Bill Gunshannon via cctalk < > cctalk@classiccmp.org> wrote: > >> >> >> I used SIMH to build RSTS V9.6 on a simulated RA81 disk. I wrote the >> disk as a file to a CDR in CD9660 format. I moved the BA350 and the >> CD to a VS3100 running OpenBSD. I was able to mount the CD under >> OpenBSD and see the file containing the disk image. I used dd with >> the command given in my original message (and repeated above) to try >> to write the image to a real SCSI disk. When I try to boot it I get >> the RSTS Message "INIT.SYS not found". The disk was completely blank >> to start so the RSTS info must have been copied but apparently not >> copied correctly. >> >> Any more suggestions? >> > > My wild speculation would be disk geometry. I don't know the specific > geometry of the RA81 disk, but it is possible that SIMH is writing a sparse > disk image. > > Did some reading up on the RA81 and looked at the relevant SIMH code; it looks like the MSCP protocol is using Logical Block Addressing, which would tend to disprove my sparse disk speculation. -- Charles