The single-level store started with Soltis' System/38 in the 1970s: http://en.wikipedia.org/wiki/IBM_System/38 http://en.wikipedia.org/wiki/IBM_System/38 I rea

The single-level store started with Soltis' System/38 in the 1970s: http://en.wikipedia.org/wiki/IBM_System/38 http://en.wikipedia.org/wiki/IBM_System/38 I really recommend Frank Soltis' Inside the AS/400 if you are interested in computer architecture and virtualization.