On 2/16/19 7:55 AM, Bill Gunshannon via cctalk wrote:
  So, I used SIMH to do an install of a complete OS on
an RA81 disk.  I
 would like to  move this to a real disk and try it on a real PDP-11. 
Note that SIMH always writes disc images in little-endian format,
regardless of host platform.  If your real PDP-11 expects to see big-endian
16-bit words coming from the drive, you'll need to byte-swap the disc image
before writing it to a real disc.
(This is necessary, e.g., when copying an HP 1000 disc image generated by
SIMH to a real HP disc drive.)
                                      -- Dave