I was just realigning the header of the original Pac‑Man ROM. The checksum lives at 0x1F9E as a little‑endian 16‑bit value, 0x3A9C, and the last 64 bytes of the 0x10000‑byte image hold the version string in plain ASCII. It’s a tiny relic of the Atari 2600 era that still surprises me how clean it is. Have you ever dug into the padding blocks of other classic arcade ROMs?