16 Feb
2019
16 Feb
'19
7:17 p.m.
On Sat, Feb 16, 2019 at 10:53 AM Charles Anthony <charles.unix.pro at gmail.com>
wrote:
On Sat, Feb 16, 2019 at 10:04 AM Bill Gunshannon via cctalk <
cctalk at classiccmp.org> wrote:
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
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.