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tried to adjust timers using formulae

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@497 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-06-26 19:32:34 +00:00
parent e4fb433cd6
commit 45a1ef7153
3 changed files with 18 additions and 4 deletions
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8
Pico/PicoInt.h
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@ -480,6 +480,10 @@ void ym2612_pack_state(void);
void ym2612_unpack_state(void);
#define TIMER_NO_OFLOW 0x70000000
// tA = 72 * (1024 - NA) / M
#define TIMER_A_TICK_ZCYCLES 17203
// tB = 1152 * (256 - NA) / M
#define TIMER_B_TICK_ZCYCLES 262800 // 275251 broken, see Dai Makaimura
#define timers_cycle() \
if (timer_a_next_oflow > 0 && timer_a_next_oflow < TIMER_NO_OFLOW) \
@ -490,8 +494,8 @@ void ym2612_unpack_state(void);
#define timers_reset() \
timer_a_next_oflow = timer_b_next_oflow = TIMER_NO_OFLOW; \
timer_a_step = timer_a_offset = 16495 * 1024; \
timer_b_step = timer_b_offset = 263912 * 256;
timer_a_step = timer_a_offset = TIMER_A_TICK_ZCYCLES * 1024; \
timer_b_step = timer_b_offset = TIMER_B_TICK_ZCYCLES * 256;
// VideoPort.c