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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.
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.