Nope. From 'SETTING UP UNIX - Sixth Edition': "Another difference is that in 11/45 and 11/70 systems the instruction and data spaces are separated inside UNIX itself." And if you don't believe that, check out: http://minnie.tuhs.org/cgi-bin/utree.pl?file=V6/usr/sys/conf/m45.s the source! ;-) Maybe you're remembering the process on a pre-V6 system? It's possible you're remembering that, as distributed, V6 didn't support load images where the text+initialized-data was larger than 24KW-delta; it would have been pretty eaay to up that to 28KW-delta (change a parameter in the bootstrap source, and re-assemble), but after that, the V6 bootstrap would have had to have been extensively re-worked. And there were _also_ a variety of issues with handling maximal large images in the startup code. Once operating, the kernel has segments KI1-KI7 available the hold the system's code; however, it's not clear that all of KI1-7 are really usable, since the system can't 'see' enough code while in the code relocation phase in the startup to fill them all. E.g. during code relocation, KI7 is ripped off to hold a pointer to I/O space (since KD7 is set to point to low memory just after the memory that KD6 points to). These might have been issues in systems which were ARPANET-connected (i.e. ran NCP), as that added a very large amount of code to the kernel. Noel