[Simh] DEC floppy disk interleave questions

[Leo Broukhis]

On Thu, 16 Jul 2015 07:53:44 -0700,  Alan Frisbie
<Frisbie at Flying-Disk.com> wrote:

> On 07/16/2015 05:40 AM, Hans-Ulrich Hölscher wrote:
>
>  > if you want to image your disks and floppies for use with simh,
>  > there's an easy way to do it.  All you need is a (Micro-)VAX
>  > having the appropriate drive(s) running VMS.
>  > MOUNT/FOREIGN <device-name>
>  > COPY/LOG <device-name> yourimagename.img
>  > DISMOUNT <device-name>
>  > Don't worry about the error message at the end of the COPY process
>  > - that's normal, just that copy discovers the end of media.
>  > You get an image containing all the blocks of your device in
>  > logical order - VMS will take care of the device details.
>
> That sounds like the really easy way to do it.   Does it copy
> track 0 of RX01/02 floppies?

I had some experience with RX01/02 floppies when reviving LSX using
logical copies of the disks. Track 0 will be logically at the very
end. The problem is with media size 256256: if the logical block size
is 512,  two physical 128-byte sectors (the boot sectors) will be
lost, and the logical copy will be 256000 bytes long.

Leo