30 April 2025

Why not Base-4?

At first glance, it seems logical to ask: Why don’t computers use Base-4 instead of Base-2? After all, wouldn’t using more numbers give us more power? While it might sound appealing, the reality comes down to the fundamental way electronics work—and why binary remains unbeatable.

Electronics love simplicity

Computers are built on circuits that recognise two states: “off” and “on”. These states are easy, reliable, and practical for electronics to detect. Base-4, on the other hand, would mean handling four distinct states—imagine “off,” “partly on,” and “fully on.” Cool in theory, but impractical in reality. Building hardware to detect such levels would not only be expensive but also error-prone. Think of it like trying to get a light switch to dim to exactly 37%—possible, but far from practical.

A costly rewrite of history

Binary’s dominance dates back to the early days of computing, when switches were literal levers toggling between two positions. Switching to Base-4 today would require a complete overhaul of modern technology. Every programme would need rewriting, every processor redesigning, and every programmer retraining. The cost? More than even the world’s wealthiest could cover.

Base-3 computers: A brief history

Interestingly, a ternary (Base-3) computer was once a serious contender in the 1950s. Yet, despite its potential, binary won out for its simplicity, reliability, and efficiency. The entire computing industry has been built on this foundation, and for good reason: sometimes less really is more.

The unbeatable efficiency of binary

While other number bases could theoretically work, binary remains the gold standard. Its simplicity makes it easy to implement, cost-effective, and highly reliable. If it ain’t broke, don’t fix it—or add unnecessary complexity.

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