BRK is a walk terminator on the 6507 (padding fall-through blocks real routine entries)

The 6507 has no IRQ/NMI wired; games never execute BRK, so every $00 byte the walker meets is data or inter-routine padding. Falling through BRK chained the walk INTO padding runs, and a 2-byte BRK decode ending mid-padding spanned the first byte of the REAL routine after the padding — the overlap resolver then dropped the (unprotected) seeded decode as misaligned.

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