The first commercial digital scope I'm aware of is
the HP 5480 digital signal
analyser, from 1969 IIRC, uses core memory(!). (I have one that's languishing
inoperative for lack of a manual.)
I too have one but mine came with manuals but was missing some
interconnect cables the manuals are not yet in my calalog or scanned.
Just been to the Digital Lives Conference and I
get the impression
that there is NO effort by any official archive to collect manuals and
such, test equipment seems to be a poorly covered area in the museum
and archive world.
Dave Caroline