these RA73's are rather nice German made full height 5" SDI 2G drives with a
standard drive power connector and ba123/23 sled.
http://www.pdp11.co.uk/profiles/by-id/233/ they have two small connectors
and one larger one. I suspect the small are SDI, while the larger one is for
online. wp switches, ID plugs etc. The small pulse transformers are visible
on the right, lead to to the small connectors and match pictures I've seem
of "straight" KDA50 cables,( minus the bulkheads.)
h
"Witchy" <witchy at binarydinosaurs.co.uk> wrote
  > might be worth an experment - now to look up
pinouts on the RA73 drive 
;)
  > everything's transformer isolated, but
I'm not sure about mysterious 
drive
   drive
selects.. 
 I read elsewhere that if you get/make the right interface cable the drive
 will be happy on its own without any extra settings, plus don't the RAxx
 drives have manual selects on them anyway? I think without setting
 anything they'll default to ID 1 port A.
 --
 adrian/witchy
 Binary Dinosaurs creator/curator
 
www.binarydinosaurs.co.uk - the UKs biggest home computer collection?