Bob Eager wrote: > On Mon, 05 Oct 2009 12:06:21 +0000, Robin Fairbairns wrote: > >> remember, the later pdp 11 models had i-space and d-space, but i never >> encountered anyone using them. > > Later versions of UNIX did. Version 7, anyway. > ISTR that RSX11M+ used I & D space. This was back in the late 1980s or early 1990s.