The Multiple Console Time Sharing System (MCTS) was an operating system developed by General Motors Research Laboratories in the 1970s for the Control Data Corporation STAR-100 supercomputer.
MCTS was built to support GM's computer-aided design (CAD) applications.
It was written in a high-level systems programming language "Malus", a dialect of PL/I.
A superset of Malus called Apple became the primary application language.
Only the system paging support module was concerned about the physical location of the data.