step-frame added to debug

[picodrive.git] / Pico / MemoryCmn.c

diff --git a/Pico/MemoryCmn.c b/Pico/MemoryCmn.c
index 1b8a1b9..fbe5041 100644 (file)
--- a/Pico/MemoryCmn.c
+++ b/Pico/MemoryCmn.c
@@ -46,7 +46,7 @@ static
 u32 z80ReadBusReq(void)
 {
   u32 d=Pico.m.z80Run&1;
-  if (!d && Pico.m.scanline != -1) {
+  if (!d) {
     // needed by buggy Terminator (Sega CD)
     int stop_before = SekCyclesDone() - z80stopCycle;
     //elprintf(EL_BUSREQ, "get_zrun: stop before: %i", stop_before);
@@ -55,32 +55,51 @@ u32 z80ReadBusReq(void)
     if (stop_before > 0 && stop_before < 20) // Gens uses 16 here
       d = 1; // bus not yet available
   }
-  // |=0x80 for Shadow of the Beast & Super Offroad
+
   elprintf(EL_BUSREQ, "get_zrun: %02x [%i] @%06x", d|0x80, SekCyclesDone(), SekPc);
   return d|0x80;
 }
 
-#ifndef _ASM_MEMORY_C
-static
-#endif
-void z80WriteBusReq(u32 d)
+static void z80WriteBusReq(u32 d)
+{
+  d&=1; d^=1;
+  elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
+  if (d ^ Pico.m.z80Run)
+  {
+    if (d)
+    {
+      z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
+    }
+    else
+    {
+      z80stopCycle = SekCyclesDone();
+      if ((PicoOpt&POPT_EN_Z80) && !Pico.m.z80_reset)
+        PicoSyncZ80(z80stopCycle);
+    }
+    Pico.m.z80Run=d;
+  }
+}
+
+static void z80WriteReset(u32 d)
 {
   d&=1; d^=1;
+  elprintf(EL_BUSREQ, "set_zreset: %i->%i [%i] @%06x", Pico.m.z80_reset, d, SekCyclesDone(), SekPc);
+  if (d ^ Pico.m.z80_reset)
   {
-    if (!d)
+    if (d)
     {
       if ((PicoOpt&POPT_EN_Z80) && Pico.m.z80Run)
-      {
-        z80stopCycle = SekCyclesDone();
-       PicoSyncZ80(z80stopCycle);
-      }
-    } else {
-      if (!Pico.m.z80Run)
-        z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
+        PicoSyncZ80(SekCyclesDone());
     }
+    else
+    {
+      z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
+      z80_reset();
+    }
+    YM2612ResetChip();
+    timers_reset();
+    Pico.m.z80_reset=d;
   }
-  elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
-  Pico.m.z80Run=(u8)d;
 }
 
 #ifndef _ASM_MEMORY_C
@@ -113,11 +132,8 @@ u32 OtherRead16(u32 a, int realsize)
     if (Pico.m.z80Run&1)
       elprintf(EL_ANOMALY, "68k z80 read with no bus! [%06x] @ %06x", a, SekPc);
     if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
-    if ((a&0x6000)==0x4000) { // 0x4000-0x5fff, Fudge if disabled
-      if (PicoOpt&POPT_EN_FM) d=ym2612_read_local_68k();
-      else d=Pico.m.rotate++&3;
-      goto end;
-    }
+    if ((a&0x6000)==0x4000) { d=ym2612_read_local_68k(); goto end; } // 0x4000-0x5fff
+
     elprintf(EL_ANOMALY, "68k bad read [%06x]", a);
     d=0xffff;
     goto end;
@@ -164,17 +180,8 @@ void OtherWrite8(u32 a,u32 d)
   if ((a&0xffffe0)==0xa10000)  { IoWrite8(a, d); return; } // I/O ports
 #endif
   if (a==0xa11100)             { z80WriteBusReq(d); return; }
-  if (a==0xa11200) {
-    elprintf(EL_BUSREQ, "write z80Reset: %02x", d);
-    if (!(d&0x1)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
-    else if (Pico.m.z80_reset) {
-      Pico.m.z80_reset = 0;
-      YM2612ResetChip();
-      z80_reset();
-      timers_reset();
-    }
-    return;
-  }
+  if (a==0xa11200)             { z80WriteReset(d);  return; }
+
 #if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
   if ((a&0xff7f00)==0xa06000) // Z80 BANK register
   {
@@ -209,17 +216,8 @@ void OtherWrite16(u32 a,u32 d)
     else elprintf(EL_ANOMALY, "68k z80 write with no bus or reset! [%06x] %04x @ %06x", a, d&0xffff, SekPc);
     return;
   }
-  if (a==0xa11200) {
-    elprintf(EL_BUSREQ, "write z80reset: %04x", d);
-    if (!(d&0x100)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
-    else if (Pico.m.z80_reset) {
-      Pico.m.z80_reset = 0;
-      YM2612ResetChip();
-      z80_reset();
-      timers_reset();
-    }
-    return;
-  }
+  if (a==0xa11200)             { z80WriteReset(d>>8); return; }
+
   if ((a&0xff7f00)==0xa06000) // Z80 BANK register
   {
     Pico.m.z80_bank68k>>=1;