Porting Test Drive II from SNES to PC, Part 1: Day 0 to a measurable ROM

Porting Test Drive II from SNES to PC, Part 1: Day 0 to a measurable ROM Between February 26 and March 19, 2026, the asmdump repo moved through 45 commits. It started as a raw reverse-engineering dump and ended this stretch with a C/SDL runtime, deterministic emulator probes, tilemap provenance tooling, and regression gates. This first part covers the first two days: what was in the repo on day 0, why the project did not start with gameplay code, and how the initial extraction and validation toolchain changed the shape of the problem. Day 0: the repo was a reverse-engineering base Commit a683c61 on 2026-02-26 is the real starting point. It imported: bank0.asm through bank31.asm game.smc and game.sym ROM build files like Makefile , linkfile , main.s , snes.asm , and spc700.asm That is enough to rebuild and inspect the ROM. It is not enough to port it. There was no extraction pipeline. There was no deterministic capture harness. There was no stable asset format that a PC runtime could lo