N-SPC Engine/Nintendo/Koji Kondo/Prototype
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The Prototype variant was used in two games: Super Mario World and Pilotwings. They are the only versions of the code that clearly pre-date the source code version provided with the IS-Sound unit. From a sound effect programming point of view, it can also be considered a predecessor to five other games that post-date the source code: SimCity, Legend of Zelda - A Link to the Past/Zelda no Densetsu - Kamigami no Triforce, Star Fox/Star Wing, Super Mario All-Stars/Super Mario Collection and Super Mario: Yoshi Island/Super Mario World 2: Yoshi's Island.
TODO: Game usage, including non-matching build cases, and ROM offsets
TODO: Instrument format (the pitch base fractional multiplier is missing compared to standard N-SPC, and Pilotwings has noise support whereas Super Mario World doesn't)
TODO: Percussion format (almost identical to instrument format except it has an extra note parameter)
TODO: VCMD map (refer back to the main page for more details when differences are not significant to the non-prototype version)