DRAM-1968 Step 19 Distinguish This Series from the 64k Periphery Story

# Distinguish What This Series Covers From What the Later Periphery Series Covers

Three series in this project's DRAM lineage now exist; before closing this one, it is worth stating precisely, not just by implication, where this series' own boundary sits relative to the other two.

## 1. State This Series' Actual Scope

This series, across Steps 1 through 18, worked entirely on the single 1T1C cell and its immediate array-level consequences: what the cell is (Steps 1-4), what it costs physically and electrically (Steps 5-7), what it is worth compared to the alternative it displaced (Steps 8-9, 15, 17), and who actually built and sold it first, under what legal and economic terms (Steps 11, 14, 16). At no point did this series ask how an external system locates one cell among many through a pin-limited package, or how refresh is scheduled and executed across an entire array without host intervention.

Distinguish What This Series Covers From What the Later Periphery Seri Step 19 — dram-1968 State This Series' Actual Scope see Section 1 State Precisely Where the Other Two Series Begin see Section 2 Confirm No Accidental Overlap Exists see Section 3 THREE-PART ARGUMENT, ONE STEP dram-1968 extension, step 19 of this project's DRAM lineage

## 2. State Precisely Where the Other Two Series Begin

This project's `dramscaling_1974` series begins exactly where this series' Step 18 left the capacitor-charge question open: what happens to $C_s$, and to this series' refresh-margin physics, once lithographic scaling shrinks the cell's planar area past the point this series' own numbers assumed. This project's `dram64k_1979` series begins somewhere this series never visited at all: pin-count pressure on packaging, address multiplexing, and on-chip refresh automation — the external-burden problem this series named explicitly in Step 13 and declined to resolve. Neither later series re-derives this series' cell physics; both simply inherit it as a given foundation, exactly as Step 9's classification intended.

Step 19 in the Dram-1968 Lineage what this step inherits and what it hands forward, by name Step 19 this step Inherits prior steps Hands Off named thread NO CELL-PHYSICS OR ARCHITECTURE RE-ARGUED each step adds a distinct angle; none re-derive settled prior content

## 3. Confirm No Accidental Overlap Exists

Checked directly against both later series' own step-by-step content: `dramscaling_1974` never revisits leakage, retention, or destructive readout as device physics — it treats $C_s$ purely as a capacitance-density target under scaling pressure. `dram64k_1979` never revisits the cell's internal operation at all — it treats the array as a black box with a pin count and a refresh obligation. This series' own boundary, drawn precisely here, holds cleanly against both.

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