+extern int timer_a_next_oflow, timer_a_step; // in z80 cycles\r
+extern int timer_b_next_oflow, timer_b_step;\r
+\r
+void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new);\r
+void ym2612_pack_state(void);\r
+void ym2612_unpack_state(void);\r
+\r
+#define TIMER_NO_OFLOW 0x70000000\r
+// tA = 72 * (1024 - NA) / M\r
+#define TIMER_A_TICK_ZCYCLES 17203\r
+// tB = 1152 * (256 - NA) / M\r
+#define TIMER_B_TICK_ZCYCLES 262800 // 275251 broken, see Dai Makaimura\r
+\r
+#define timers_cycle() \\r
+ if (timer_a_next_oflow > 0 && timer_a_next_oflow < TIMER_NO_OFLOW) \\r
+ timer_a_next_oflow -= Pico.m.pal ? 70938*256 : 59659*256; \\r
+ if (timer_b_next_oflow > 0 && timer_b_next_oflow < TIMER_NO_OFLOW) \\r
+ timer_b_next_oflow -= Pico.m.pal ? 70938*256 : 59659*256; \\r
+ ym2612_sync_timers(0, ym2612.OPN.ST.mode, ym2612.OPN.ST.mode);\r
+\r
+#define timers_reset() \\r
+ timer_a_next_oflow = timer_b_next_oflow = TIMER_NO_OFLOW; \\r
+ timer_a_step = TIMER_A_TICK_ZCYCLES * 1024; \\r
+ timer_b_step = TIMER_B_TICK_ZCYCLES * 256;\r
+\r