P?S/8
P?S/8 was developed starting in 1971 from an MS/8 foundation. It runs on minimal PDP-8 configurations, supports somewhat device independant I/O and requires a random-access device for the file system (DECtape is random-access!). P?S/8 runs compatibly on most PDP-8 machines including DECmates, excepting only the PDP-8/S and PDP-5.
(Source: PDP8 FAQ)












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