The Mir Core Module (DOS-7) design was based on the earlier DOS based Salyut 6 and Salyut 7 space stations. However, there were many key differences which included better computers and solar arrays. It was designed to comfortably fit two cosmonauts each having their own cabin. The Core Module also had six docking ports. Four of them, which were located radially on the node on the front of the module, were called "berthing" ports designed for station expansions. The other two ports were located laterally, one located at the node and the other located at the aft of the module, were designed for routine Soyuz and Progress dockings. Mir had two engines, located aft, which were designed for orbital maneuvers. Each engine was capable of 300 kg of thrust. Both of the engines were permanently disabled in April, 1987 after the arrival of the Kvant-1 module at the station's aft port. #Space_station_MIR
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