DOS (/dɒs/, /dɔːs/) is a platform-independent acronym for Disk Operating System which later became a common shorthand for disk-based operating systems on IBM PC compatibles. DOS primarily consists of Microsoft's MS-DOS and a rebranded IBM version under the name PC DOS, both of which were introduced in 1981. Later compatible systems from other manufacturers are DR DOS (1988), ROM-DOS (1989), PTS-DOS (1993), and FreeDOS (1998). MS-DOS dominated the IBM PC compatible market between 1981 and 1995.
Singleplayer is one player
Prototypes are pieces of software that are incomplete, usually to present an idea to get user feedback on how the software performs. Some unreleased games enjoy an existence as a prototype, usually seen by very few until released on the internet by either their original creators or fans.
A long lost educational game made for Chevron industries by Maxis that aims to learn the ins and outs of refineries. The game features little in means of build options, but there are introductory tutorials and random events and preset placements for buildings to be placed.
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