The Ternary Ghost: Setun, Path Dependence, and the Invisible Hand of Technological Lock-In
The Ternary Ghost: Setun, Path Dependence, and the Invisible Hand of Technological Lock-In In the late 1950s, Moscow State University built Setun—the world’s only mass-produced ternary computer, using balanced ternary logic (−1, 0, +1) instead of binary. Cheaper, more power-efficient, and theoretically superior in information density, it processed payrolls, dam stresses, and oil pipelines across the USSR. Yet by 1965, Soviet planners killed it—not for failure, but for incompatibility with the binary standard. This essay traces Setun’s rise and fall, revealing how path dependence, not physics, decides technological fate. From its 18-trit ferrite-core architecture to the political decree that ended it, Setun exemplifies how early accidents of history calcify into unbreakable systems. The Machine That Spoke a Different Language On a cold Moscow morning in 1958, a small team led by Nikolay Brusentsov powered up a prototype unlike any before it. “ We didn’t want to c...