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Abacus is a generator program which generates +4 PWR at the start of each mission. It can be bought from some Server Terminals for 400 credits. It has no other effect for the remainder of the mission.
Abacus 2.0 is an upgraded version of Abacus which generates +6 PWR at the start of each mission. It can be bought from some Server Terminals for 550 credits. It is possible to install both Abacus and Abacus 2.0, to generate a total of +10 PWR at the start of each mission.