Although they were considered one of the most advanced cyborgs ever created, Robobrains never reached full production status. Persistent problems with aggression and violence even in properly CODE-conditioned Robobrains caused major problems for General Atomics. Until its closure, SAD experimented with developing a new kind of cybernetic brain explicitly designed for use in Robobrains, while RB-2851 focused on manufacturing and iterating on existing solutions. Although the first brains were procured from primates (typically chimpanzees), persistent equipment failure in brain extractors that were incapable of working at an industrial capacity, and flaws in the immature technology used to manufacture Robobrain chassis resulted in a limited trial run. RB-2851 alone managed to complete three batches, with a further two planned. Each batch provided superior upgrades to the robot, including increased energy efficiency, maintaining brain longevity, improved visual cortex connections to enhance motor skills and perception, and tactical combat capabilities.
Developed by General Atomics International with the assistance of RobCo Industries, the Robobrain was designed from the ground up as a multirole platform for use by military and civilian clients. They are more flexible and powerful than robots due to the fact that their central control and processing unit is an actual brain, rather than an artificial facsimile. Coupled with a robust, all-terrain tracked chassis and powerful armaments, the Robobrain was on the forefront of a new revolution in combat robotics.
Unlike in previous Fallout games, the robobrain from Fallout 4 appears to have a built-in eye in front of the brain.
The basic variant is the weakest and most common robobrain, with one of the manipulators replaced with a Tesla coil that fires an electrical discharge that arcs between targets. All robobrains are capable of a "mesmetron" attack that looks similar to the blast from a gamma gun. This blast is blue in color, staggers the player character and makes them black out briefly upon contact with the blast. Mesmetron blasts increase in frequency the more difficult the robobrain encountered.
This version of robobrain is the second most powerful variant. Cybermechs come equipped with their standard claw for melee, but an abnormally powerful robot modification, the unstable Gatling laser. Besides this change in weaponry, some kind of robot armor, perhaps primal plates, have been added to reinforce the chassis of the robobrain. This version of robobrain has a 150 point boost in health over the integrated robobrain, and is fully capable of rotating its torso independently of its treads, leaving almost no way to flank it. It may also strafe the player character with its rotating torso and treads, leaving stationary combat ill-advised.
The most deadly version of robobrain built by the Mechanist. The Quantum Robobrain has been highly modified with hydraulic armor, making damaging limbs or destruction of the robot nigh impossible without heavy weaponry. Additionally, Quantum Robobrains are capable of tactics such as basic cover systems and high-speed strafing. They are more accurate with their unstable Gatling laser than their Cybermech counterparts, and the frequency of the mesmetron attacks leaves the player character almost completely blind. This foe is cunning, cruel, and leaves almost nowhere to hide from their unending assault.
↑The Sole Survivor: "Have you seen a robot with a brain like that before?" Ada: "No, but my old caravan discovered records about them while we were scavenging military facilities. According to my data banks, it's called the "Robobrain." It was considered one of the most technologically superior robots ever constructed, but the model never reached full production status." (Ada's dialogue)
↑The Sole Survivor: "Here you go, Ada. The final Radar Beacon. I'll need that head back when you're done." Ada: "Of course. Shouldn't take but a moment.There you go... still in one piece.I'm not sure why you want the head back. All we needed was its Radar Beacon.Besides, Robobrains are notorious for being... well, a real pain in the neck." The Sole Survivor: "What else do you know about them, Ada?" Ada: "Quite simply, it's the first time General Atomics produced a successful union between organic matter and robotics. The brain is used both as a control unit and a data storage unit which is far more efficient than using standard circuits.Unfortunately, there were a lot of programming issues with these robots which caused them to be a bit... shall we say, unhinged?Hopefully, this particular Robobrain will have some of the answers that we've been seeking." (Ada's dialogue)
↑Fallout 2 Official Strategies & Secrets p.33: "The Robobrain is a jack-of-all-trades robot. They have hands and are usually armed with assault rifles. The chimpanzee, or other primate, brain that was implemented into them makes them excellent guard robots. It's rumored that some were set up to accept human brains, but this has never been proven."