Anyway, the 780 needs a floppy to boot. Is this the
sort
of thing that is generically available, on the WWW for instance
Don't take this for the definitive answer, but...
"S'matter, Don't you think one of us has one?"
I have a collection of old DEC 8"/Vax era at home.
If you don't get lucky elsewhere there may be something
you can use.
I used to have exactly what you wanted in my travel case
in 1982. Since I didn't steal that one from work we'll
see if there's another one from history since (mainly
the MIT swap meet).
John A.