Editing IBM 7090 (section)

===7094/7044 Direct Coupled System===
The  '''7094/7044 Direct Coupled System''' (DCS) was initially developed by an IBM customer, the [[Aerospace Corporation]], seeking greater cost efficiency and scheduling flexibility than IBM's IBSYS tape operating system provided. DCS used a less expensive IBM 7044 to handle [[input/output]] (I/O) with the 7094 performing mostly computation. Aerospace developed the Direct Couple operating system, an extension to IBSYS, which was shared with other IBM customers. IBM later introduced the DCS as a product.<ref>{{cite web|url=http://www.softwarepreservation.org/projects/os/dc.html|title=The Direct Couple for the IBM 7090|last1=Patrick|first1=Robert L.|last2=Van Vranken|first2=Richard K.|publisher=Software Preservation Group, [[Computer History Museum]]|date= February 2009}}</ref><ref>{{cite journal |title= A directly coupled multiprocessing system |author= E. C. Smith |journal= IBM Systems Journal |date= September–December 1963 |volume= 2 |issue= 3 |pages= 218–229 |doi= 10.1147/sj.23.0218  }}</ref>