“Dragon Quest (Japan)”

Cite as: “Dragon Quest (Japan)”
Licence: proprietary; never redistributed (docs/data-policy.md#roms)
Credit: Chunsoft (developer) and Enix
Notes: NES 2.0 header: 32 KB PRG ROM, 32 KB CHR ROM, mapper 3 (CNROM), no battery. Without the 16-byte header the SHA-1 is 4e72277dc2ab3b70b29086c0664014caf6e16cb2. The PRG sits whole at $8000-$FFFF.

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Dragon Quest (Japan) holds Dragon Warrior's excellent-move and dodge code (bank 3 $E615-$E650 and $E664-$E699) at $E45C-$E497 and $E4AB-$E4E0, the same bytes except the targets of its JSR and JMP instructions and one call: where Dragon Warrior starts a sound effect with a bank call (`BRK`, then `.byte $04, $17`), Dragon Quest has `JSR $F431`. The random-number routine both call (`UpdateRandNum`, Dragon Warrior $C55B) is byte-identical at Dragon Quest's $B0BF, and the multiply (`WordMultiply`, $C1C9) matches at $B076 but for one jump target. Each monster's dodge value comes from the monster data, which this comparison doesn't cover.	`0x646C-0x64A70x64BB-0x64F00x30CF-0x30FA0x3086-0x30AC`	Code