Sounds like HP-IB all right. Note that not all 7970s
are.
It's a fairly safe bet IMHO that anything HP after about 1975 with that
connector is HPIB. There are probably exceptions, but I've not come across
many (any?)
BTW, what's the correct name for that series of connectors? We tend to
call them 'Amphenol Connectors' in the UK (while realising that Amphenol
make a wide range of different connectors). I've also seen them called
'Centronics Connectors' (after the common use for the 36 pin one I guess),
IEEE (or IEEE-488) connectors (after the common use for the 24 pin one)
and 'Telco Connectors'. I think the last is what HP call them.
-Frank McConnell
-tony