Routines
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C9F3: Clear dX and dY
Used by the routines at settle_charm, upd_62, dec_dZ_upd_XYZ_wipe_if_moving and move_player_apply.
dX and dY are one frame's movement, so once applied they go back to zero. Also the end of several other objects' updates.
clear_dX_dY C9F3 XOR A
C9F4 LD (IX+$09),A
C9F7 LD (IX+$0A),A
C9FA RET
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