# ADR-0012: Phase-1.0J first-frame identity

- Status: accepted for offline diagnostic construction
- Date: 2026-07-22
- Decision: `FIRST_FRAME_INDEX_ZERO_SOURCE_CONSISTENCY_ONLY`

## Context

The consumed Phase-1.0H run submitted the diagnostic buffer with
`sceVideoOutSubmitFlip(handle, 0, 1, 0)` and received `-1`. The diagnostic
helper used buffer zero, while the patched normal SDL update path started its
frame counter at one. The public PS5 SDL source at commit
`0baf4ac49382b537ba449901b5b6d0d189bb1fbb` starts that normal counter at
zero. Phase 1.0I classified the mismatch as a strong source candidate, not a
proven firmware root cause.

## Decision

The Phase-1.0J SDL overlay defines one compile-time source of truth,
`CHIMERA_PS5_FIRST_FRAME_INDEX`, with value zero. The early diagnostic copy,
the early diagnostic submit and the normal update counter all derive their
initial index from that macro.

Zero is selected because it preserves the already-audited diagnostic tuple
and agrees with the public SDL source. It is not selected on the basis of an
unpublished ABI or an inferred firmware requirement.

## Consequences

The internal zero-versus-one inconsistency is removed and can be checked in
source, linker-map and disassembly evidence. This decision does not prove that
buffer zero is accepted on firmware 9.60, that the fourth flip argument has
the required semantics, or that the old mismatch caused the Phase-1.0H
failure.

Phase 1.0J remains an offline artifact phase. A separately reviewed exact
artifact and new explicit permission would be required before any connection,
transfer, result reception or execution.