Notes:Syvalion (Arcade)

This page contains notes for the game Syvalion (Arcade).

General Developer Tool Notes

Each debugging function expects to be able to save and read from the area 0x03F000-0x03F198, which is part of the game ROM. This was probably possible to do on development machines, but not in the final game, for obvious reasons. The tool "fixes" change every single 0x03Fxxx value to 0x10Fxxx, which is part of the game's RAM space and can be read/written to with no problems.

Additionally, the debug functions were written with a different set of button inputs in mind, which is why in the final game they're mapped to weird inputs like "Tilt", "Service", and worst of all, "1P Coin". There were also some buttons on those developer units that don't exist on the final arcade cabinet. All of the functions that are listed as "2P Button 1" were originally controlled by those buttons. The codes just fix them to use the only remaining available button.