Many thanks for the details of the ISIS.... looks and sounds very much like the SAARU in the triple 7. ...
Minor correction:
-ISFD (Integrated Standby Flight Display) is the B. naming for ISIS.
-SAARU (Secondary Attitude Air data Reference Unit) is the "back-up" ADIRU of the777.
an everything-you-need-PFD-in-a-self-contained-box. Pop one of those in your little ragwing and you're home free!
Exact! 1 standby instrument for whole fleet! A. thru Z.