On 5/3/16 11:15 AM, Paul Koning wrote:
> Keep in mind that mapping and protection are not required to build a > multi-user system. DEC did timesharing on the PDP-11/20 (RSTS-11) and on the > PDP-8 without either. The SDS-940 is an early small-ish timsharing system that had base-bounds memory protection, circa mid-60s It was the platform that a lot of early timesharing services used. TSS/8 used 4K segmentation with protection (memory expansion/timeshare control option) The early BASIC minicomputer timesharing systems (line 2000TSB) had virtual BASIC machines for each user that swapped.
