CENTRAL DATA 64K RAM LAB — VERSION HISTORY

Version 2 — 8 October 2026
Public: https://cdc64k-ram-lab.noddson.chatgpt.site/

Adds reviewed 8080 access qualification including MDO7, settled trigger lockout,
event-based IC6/IC1 arbitration, sampled M1, normal/forced refresh counters,
8080 HALT / Z80 HALT / wait / reset / stopped-PCLK presets, manual inputs,
row age and known-data coverage, timestamped events, per-bank refresh MDI
resolution, and conditional early-write/held-read inspection. Expands the
circuit guide, source qualifications, diagrams and reproducible tests.

This remains a functional reconstruction, not a transistor-level simulator.
The oscillator interval and cycle envelope are explicit assumptions. Delay
line taps, analog output contention, gate races and electrical margins remain
unmeasured. Full limitations and evidence are on the page.

Version 1 — preserved original behavior
Live: https://cdc64k-ram-lab.noddson.chatgpt.site/v1/index.html
Source commit: 7a0959a02975c2a73274eef610ff0f864dba85eb
Sites saved version ID:
appgprj_6ac6ec24495c81918cc982ec81ca6706~appgver_7d0391084dc8819184868c5ac58313a9
Project ID: appgprj_6ac6ec24495c81918cc982ec81ca6706

The four original assets are preserved byte for byte in dist/v1. The source
archive contains v1-manifest.json with their SHA-256 hashes. Run `node checks.mjs`
from the source root to validate model checks and unchanged V1 assets.
V1 retains its original explanations and limitations, including the superseded
8080 trigger sentence and periodic retention scheduler. It is an archival
comparison, not the corrected theory of operation. Each page has independent
in-memory experiment state; navigation does not migrate state or save it.

RESTORING THE ORIGINAL PRODUCTION BEHAVIOR
An authorized Sites editor can deploy the exact saved V1 ID above to this
same project, preserving the current audience. No source reconstruction is
needed. This reverts the main URL to the original complete site; the /v1 path
belongs to the V2 package and need not remain available after that rollback.
To return to V2, select and deploy the saved Version 2 in this project's version
history. Both complete source states remain in the source repository.

LOCAL USE
Serve the archive's dist directory with any static HTTP server. Open /index.html
for V2 and /v1/index.html for V1. ES modules require HTTP; opening files directly
with file:// may be blocked by the browser. No server-side memory storage,
accounts or browser persistence are used. Resetting/reloading loses experiments.