+extern int timer_a_next_oflow, timer_a_step, timer_a_offset; // in z80 cycles\r
+extern int timer_b_next_oflow, timer_b_step, timer_b_offset;\r
+\r
+void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new);\r
+void ym2612_unpack_state(void);\r