TWO-STREAM KERNEL DECODED (F171's page-cursor model corrected)

Exit $11422: LDX #$1F / TXS (SP → TIA ENABL $1F — the per-scanline stack-blit re-arm; the $1C variant lives at the $11313 site) / TAX / INY (SCANLINE ADVANCE) / CPY #89 (band wrap). So the scanline structure is: [stream-A read/advance-or-repeat] → [draw A] → [stream-B read/advance-or-repeat] → [blit re-arm] → INY → CPY #89 → next line.

Raw traces, ROM material, local paths, and personal data are not part of this public record.