Big WPC update with game_state information #94
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Thanks to https://github.com/neophob/wpc-emu for these addresses.
Results of manual testing using the hex editor in PinMAME debug mode, and use of a Python script to add the new fields.
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I manually went through all of the WPC games to find the offset for a 4-byte sequence encoding current player/ball, number of remaining extra balls for the current player, and the total number of extra balls earned on the current ball.
I also identified a byte on the "zero page" (addresses less than 0x100) that seems to reliably report when the game is in attract (or "non-game" mode) versus when a game is underway. I noticed that byte briefly goes to 0 when entering the test menu, but then quickly returns to 1.