[Simh] RP/RM differences in header commands (for ITS, salvager)

[Lars Brinkhoff]

Johnny Billquist wrote:
> Right. But that sounded what the OP was looking for. He noted that
> serial number and information was written to the pack. The serial
> number is never, as far as I can remember, for any disk drive, written
> anywhere in any header fields or similar.

The ITS program called SALV apparently retrieves the drive serial number
with a device command, then proceeds to write this number to every
sector header, in the first key field.  The second key field holds the
pack number, as specified by the user when formatting the pack.