DRAM-Scaling-1974 Step 20 Close the Extension Handing Off to the Periphery Series

# Close This Extension: What the Capacitor Fork Leaves for the Rest of This Project

Nine additional steps have now named the real generations, companies, equipment, materials, and economics behind the trench-versus-stacked fork this series built technically across its original ten steps; this step closes the extension by stating plainly what remains and where it continues.

## 1. Summarize What This Extension Added

Steps 11 through 19 attached real history (Step 11), a second independent physical-risk comparison (Step 12), the specific equipment (Step 13) and specific new problem (Step 14) each geometry's own path required or created, a materials-level lever beyond geometry (Steps 15, 16), the strategic dimension behind the fork (Step 17), a direct connection to this project's refresh-power lineage (Step 18), and a yield-and-test-economics accounting (Step 19) — none of which reopened the purely technical trench-versus-stacked comparison the original ten steps already completed.

Close This Extension: What the Capacitor Fork Leaves for the Rest of T Step 20 — dram-scaling-1974 Summarize What This Extension Added see Section 1 Name the Threads This Extension Leaves Open, Hon see Section 2 State What Closes Here see Section 3 THREE-PART ARGUMENT, ONE STEP dram-scaling-1974 extension, step 20 of this project's DRAM lineage

## 2. Name the Threads This Extension Leaves Open, Honestly

The refresh-power tension named in Step 18 continues in this project's `dram64k_1979` series, at the periphery level where it is actually resolved. The broader capacitor-geometry story, past the trench-versus-stacked fork this series covers, continues into the modern metal-insulator-metal stacked structures this series' own Step 10 retrospective already named as the eventual industry standard — a thread this extension does not need to re-cover, since Step 10 already closed it adequately for this series' own scope.

Step 20 in the Dram-Scaling-1974 Lineage what this step inherits and what it hands forward, by name Step 20 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. State What Closes Here

What closes with this step is the capacitor-scaling story this series was built to tell: a crisis in 1968's own planar geometry (Step 1), a fork into two competing three-dimensional geometries (Steps 2 through 9), real industrial history attached to that fork (Steps 11 through 19), and an honest statement of what both geometries' story still owes to the periphery-level DRAM series this project tells next.

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