Confront the 1962 Bipolar Logic Baseline Standing Power Cost Before Mos Existed

# Confront the 1962 Bipolar Logic Baseline: Why a Field-Effect Alternative Looked Worth the Risk

## 1. Why 1962's Digital Logic Was Entirely Bipolar, and Entirely Hungry for an Alternative

By 1962, every commercial digital logic family in production — resistor-transistor logic (RTL), the newer diode-transistor logic (DTL), and a handful of proprietary current-mode variants — was built from bipolar junction transistors switching current through resistor networks, and every one of them paid a standing power cost whether or not a gate was actually switching. A bipolar gate's resistors draw current continuously, in both logic states, simply to hold a voltage level; multiply that by the gate counts system designers were already asking for, and the power-density ceiling was visible years before anyone could build past it. A genuinely different switching element — one that blocked current in its off state by electrostatic field rather than reverse-biased junction leakage alone — had been patented in outline since the 1930s but never built as a working, controllable device. The incentive to finally build one was not curiosity; it was the bipolar family's own standing-current arithmetic:

Confront the 1962 Bipolar Logic Baseline: Why a Field-Effect 1. Why 1962's Digital Logic Was Entirely Bipolar, and Entirely Hungry for an Alternative BIPOLAR GATE, EITHER LOGIC STATE pull-up / base resistors draw current continuously I ≠ 0 in BOTH states standing power, always paid field-effect channel blocked by an electric field, no resistor network required off state: near-zero standing current, in principle the arithmetic that makes a field-effect alternative worth the engineering risk, years before one works reliably

## 2. Real Diagram: The Logic-Family Landscape Immediately Before Experimental MOS

Nothing about this arithmetic was secret in 1962; what was missing was a way to build the field-effect side of the comparison as an actual, controllable, reproducible device. The landscape below places experimental MOS at the exact point it has to enter the story: alongside, not yet instead of, the bipolar families already running in production.

Real Diagram 2. Real Diagram: The Logic-Family Landscape Immediately Before Experimental MOS 1962 LOGIC LANDSCAPE RTL in volume production DTL newer, better noise margin experimental MOS not yet built, this series’ subject this project tracks both sides of this comparison step by step, not a replacement narrative told from only one side

## 3. The Logic-Family Landscape Immediately Before Experimental MOS

This series does not assume MOS wins; it tracks the two families' real, contemporaneous progress side by side, because in 1962 neither the bipolar incumbents nor the field-effect challenger had yet settled which one would actually win the next decade's logic-density race, and that uncertainty is itself the honest starting condition for everything that follows.

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