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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.
Abacus and Abacus 2.0 are considered by many players to be almost worthless. This is because they generate so little PWR per mission compared to other generator programs, and because Incognita has a limited number of program slots, so using a slot for Abacus or Abacus 2.0 means one fewer slot is available for other programs.