# Ch361 audit log -- C18 draw-count scaling

## Scope

Eighteen authentic, in-bounds SH3 PSMT8 draws were grouped into six ordered 204-triangle epochs at native 640x480. They share `tbp=8192`, `cbp=13888`, byte-identical texture/CLUT contents, and authentic `ZTE=1`, `GEQUAL`, `ZMSK=0`, `PSMZ16S` state.

## Evidence

- Fixture preflight passed; fixed `PSCALE=1024` and rounded XY were retained.
- Capture gate passed: ALL `44890/49149` (91.3%), MULTI `24969/26680` (93.6%), `clut_bad=0`, one fill plus five reuses, six fresh drains, no overflow or underflow.
- Real Z integration passed: 205744 fragments, 103300 Z passes, zero drops, exact Z `0/307200` and color `0/49071`.
- Board host gate passed: six 204-record epochs, one fill, five resident reuses, zero drops, 49071 nonzero pixels.
- Board framebuffer and Z integration framebuffer SHA-256: `a0eda56ef0140749451078a0fc82d85ea6e3342734dacdc22dd93f0a56dbb539`.
- Replay-color is exact: `307200/307200`; 205744 fragments, 103300 Z-pass updates, 49071 covered pixels.

## Result

Ch361 is closed on silicon with no RTL, SDC, QSF, or RBF change from the C6-signoff core.
