Comment by mzs

More like both, there was a block address register (BAR) and when it was 0..63 that was selecting a core memory board. So that's sort of like segmentation but core could be paged out from and in to tape, disc, or drum. For example the OS (OPSYS) could be paged out to free up block 0 of core memory. So that's paging and even neater it was basically a page per program so independent programs could run concurrently, paging core in and out as needed. The paging was handled by controllers (disc, tape, drum) with very little involvement of the CPU (executive).

See 3.1.1, 3.3.2, 3.4, 3.5, 5, & 5.2: http://www.zenker.poznan.pl/k-202/dokumentacja/k-202-reklama...