IIRC System/38 was the one product to actually ship that was based on concepts from IBM’s FS effort. FS was an attempt to produce a fully virtualized — at every

IIRC System/38 was the one product to actually ship that was based on concepts from IBM’s FS effort. FS was an attempt to produce a fully virtualized — at every layer — System/370 successor in the mid to late 70’s; it failed.