The Free On-line Dictionary of Computing (30 December 2018):

IDS/I

   Integrated Data Store.  An extension to COBOL involving
   "chains" (circular lists), for General Electric computers.

   ["A General Purpose Programming System for Random Access
   Memories", C.W. Bachman et al, Proc FJCC 26(1), AFIPS (Fall
   1964)].

   [Sammet 1969, p. 376].