Memory Overload: How finite information capacity drives early suppression of Hawking evaporation for light primordial black holes

Preprint, October 2026. We develop a working account of Memory Overload — the idea that a black hole's finite information capacity, as the hole evaporates, forces a change in how further emission can proceed — and apply it to light primordial black holes. From a capacity-record balance with the radiation entropy ratio r = dS_rad/dS_BH, we derive from stated premises a mass-independent emitted-fraction onset, the Page Lock, at L_sat = 0.2137 (greybody mixture r_mix = 1.6195; time fraction 0.514). A mode-count coefficient, the Quell Factor G_c = 366.48, multiplies a throttle whose entropy exponent is narrowed, not derived. Under the E2c mass law and Thoss's low anchor, an independent recompute places a q=3 mass window at 5.00535e5 - 1.18223e10 g. Merger bounds, under assumptions carried from DMPZ/ZV, exclude f=1 across that window and demote a pure dark-matter reading to f less than or about a few times 10^-3, conditional on those assumptions. Intended for submission to arXiv (gr-qc).