General Theories
Like all theories pertaining to the OS-tan universe, the views presented in this article may not be considered canon or even fanon by all people. The majority of these theories come from various character-creation threads on OSC, as well as the personal views of various OS-tan artists and writers. The goal is to gather all theories at a central location before putting them in their proper articles (under the Theories and Notes section).
Theories about present and past factions
The DEC-tans became a military faction in response to outside forces
The DEC-tans did not originate as a military faction. In fact, their first decade or so was entirely peaceable, and the members opposed to fighting for the most part. However, in the late 1960s, the Data General faction was founded not far from DEC territory; unlike the DECs, the DG faction was an aggressive group, and often made direct threats to the DEC-tans. Fearing for their safety and security, the DEC-tans took up arms and taught themselves how to fight.
Fear of the IBM-tan faction may have also contributed to this shift.
The Data General-tan Faction
Like the DEC-tans, the DG-tans had their own faction. It was founded in 1968, when PDP-8-tan's creator abandoned DEC after the higher-ups refused his plan to create an improved successor for her. The Data General faction was founded, with Nova-tan becoming the de-facto leader of their computer-tans.
The DG-tans were founded as a military faction and made constant threats to destroy their neighboring factions - in particular, the DEC-tans. They were a notoriously austere and authoritarian group, in stark contrast to the more liberal and playful DEC-tans, and may have possessed more advanced technologies. However, they were also very small, somewhat impoverished and suffered poor leadership, and could never overtake the far larger, more popular and better-organized DECs.