O/S Upgrades give the player special bonuses and abilities which are unattainable otherwise. They are only granted by the O/S Upgrade Machines, which are very rare, with only four of them throughout the whole game. Only one upgrade per Machine is possible. Installed O/S Upgrades are permanent, thus cannot be undone.
List of O/S Upgrades
Lethal Weapon: Increases melee damage by 35%.
Pack-Rat: Grants the Soldier access to an extra column of inventory slots.
Sharpshooter: Increases ranged weapon damage by 35%, contrary to what the game's tooltip description says.
Speedy: Increases movement speed by 15%.
Tank: Increases maximum Health Points by 5.
|System Shock 2 Character Builds|
|Classes||Marine • Navy • O.S.A. Agent|
|Statistics||Strength • Endurance • Psionic Ability • Agility • Cybernetic Affinity|
|Technical Skills||Hacking • Repair • Modify • Maintenance • Research|
|Combat Skills||Standard Weapons • Energy Weapons • Heavy Weapons • Exotic Weapons|
|O/S Upgrades||Cyber-Assimilation • Cybernetically Enhanced • Lethal Weapon • Naturally Able • Pack-Rat • Pharmo-Friendly •|
Power Psi • Replicator Expert • Security Expert • Sharpshooter • Smasher • Spatially Aware • Speedy •
Strong Metabolism • Tank • Tinker