# 8B/5B/SCM Render Fix — Diagnosis + Stage/Verify Results (2026-06-18)

Driving the ~5,148 unpublished 8B/5B/SCM PASS records (render-coverage gap, same class as DSCA).

## Root cause (validated)
1. **parseRawData bug (general):** a PASS/FAIL line is wrongly consumed as the step-response line
   for non-DSCA families that omit the `"0","0",v` line (8B45/8B49/5B39/SCM5B33...) -> drops the
   first Final-Test group -> measurement-count mismatch -> null. Fix: change the step-skip guard to
   `if (!((family === 'DSCA' || skipStepIfStatus) && looksLikeStatus))` and pass `skipStepIfStatus`
   only for templated models (so non-templated models are byte-unchanged).
2. **No per-model Final-Test template:** one hardcoded `DATA_LINES['8B']` (RTD-shaped) -> wrong
   param names/specs for non-RTD models (8B45 is frequency-input == DSCA45). Needs per-model
   templates, same as DSCA. The "published" siblings render null too (legacy content on Hoffman;
   `api_uploaded_at` was back-populated from Hoffman inventory, NOT from our render).

## Artifacts
- `8b5bscm-templates.json` — 136 models mined from Hoffman originals (accOut, accHeader, rows, _srcSerial).
- Verify harness pattern: patch a TEMP copy of datasheet-exact.js (parse-fix + template-gated
  Final-Test, footer skip), render each model's published `_srcSerial`, content-normalized compare
  to its Hoffman original. (Never touches the live renderer.)

## Verify results (template-gated Final-Test only; NO slotmaps/precision/accuracy-label work yet)
Content-only (cosmetic header/spacing deferred, per the DSCA byte-fidelity decision):
- 15 models content-perfect (>=0.99) — publishable as-is.
- 17 within precision-tuning distance (0.93-0.97) — single value-row rounding diffs.
- 27 @ 0.85-0.93, 7 < 0.85.
- 70 NULL — render-count mismatch -> need per-model slotmaps.
- By family: 8B avg 0.97, SCM5B 0.93 (strong); 8B38 0.78; 7B ~0.88 (separate parse path).

## Remaining work = the SAME machinery AD2 built for DSCA
1. Per-model **slotmaps** for the 70 nulls (AD2 `_derive_slotmaps.js`) — derive by matching rendered
   measured values to the Hoffman original's displayed values.
2. **QB single-precision rounding** (AD2 `Math.fround`) — closes the 0.93-0.97 precision diffs.
3. **Frequency/AAC accuracy-block labels + stimulus formatting** — the still-open DSCA45/33 piece
   (8B45/8B49/5B45 are frequency-input; SCM5B33 is AAC). Solving once covers BOTH 8B/5B AND DSCA45/33.
4. 8B38 (0.78) + 7B family (separate SCM7B path) — family-specific.

## Recommendation
Converge with AD2's mature DSCA machinery rather than re-implement in parallel in the shared
`datasheet-exact.js`: feed the mined `8b5bscm-templates.json` into AD2's template/slotmap/rounding
path and finish the frequency/AAC accuracy renderer once for DSCA + 8B/5B/SCM together.
The 15 content-clean models can be published immediately if a partial win is wanted.
