X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FMemory.c;h=dbf0118a9c99ee4083ef952a5a3ee7c21d20f926;hb=4936aac1cac5db9c8a0bec2d743d05be5c799f1f;hp=fb6b99c41e6ab98bc94b9b461e3911c3be372dbc;hpb=43e6eaad0b73b37907be3342e0fd4cf65919e9f6;p=picodrive.git

diff --git a/Pico/Memory.c b/Pico/Memory.c
index fb6b99c..dbf0118 100644
--- a/Pico/Memory.c
+++ b/Pico/Memory.c
@@ -799,7 +799,7 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
             //ym2612.OPN.ST.TAC = (1024-TAnew)*18;
             //ym2612.OPN.ST.TAT = 0;
             //
-            timer_a_step = timer_a_offset = 16495 * (1024 - TAnew);
+            timer_a_step = timer_a_offset = 16466 * (1024 - TAnew);
             if (ym2612.OPN.ST.mode & 1) {
               int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
               timer_a_next_oflow = (cycles << 8) + timer_a_step;
@@ -815,7 +815,7 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
             //ym2612.OPN.ST.TBC  = (256-d)<<4;
             //ym2612.OPN.ST.TBC *= 18;
             //ym2612.OPN.ST.TBT  = 0;
-            timer_b_step = timer_b_offset = 263912 * (256 - d);
+            timer_b_step = timer_b_offset = 262800 * (256 - d); // 262881
             if (ym2612.OPN.ST.mode & 2) {
               int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
               timer_b_next_oflow = (cycles << 8) + timer_b_step;
@@ -883,14 +883,13 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
   return YM2612Write_(a, d);
 }
 
-// TODO: savestates
+
 #define ym2612_read_local() \
   if (xcycles >= timer_a_next_oflow) \
     ym2612.OPN.ST.status |= (ym2612.OPN.ST.mode >> 2) & 1; \
   if (xcycles >= timer_b_next_oflow) \
     ym2612.OPN.ST.status |= (ym2612.OPN.ST.mode >> 2) & 2
 
-
 u32 ym2612_read_local_z80(void)
 {
   int xcycles = z80_cyclesDone() << 8;
@@ -913,6 +912,23 @@ u32 ym2612_read_local_68k(void)
   return ym2612.OPN.ST.status;
 }
 
+// TODO: new ym2612 savestates, also save timers
+void ym2612_unpack_state(void)
+{
+  int i;
+  YM2612PicoStateLoad();
+
+  // feed all the registers and update internal state
+  for (i = 0x20; i < 0xC0; i++) {
+    ym2612_write_local(0, i, 0);
+    ym2612_write_local(1, ym2612.REGS[i], 0);
+  }
+  for (i = 0x30; i < 0xC0; i++) {
+    ym2612_write_local(2, i, 0);
+    ym2612_write_local(3, ym2612.REGS[i|0x100], 0);
+  }
+}
+
 // -----------------------------------------------------------------
 //                        z80 memhandlers