X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mappers%2F25.c;h=37e2742494ecf70c0a4f181b0fbaf935d5754679;hb=5bd16b94320afa9dfba4985f5d69c2d84bae4c33;hp=0735b9b097a48ae679f1418924936acdfd42ccb9;hpb=c0bf6f9f02a2b6afb961a7e9195e2168d7e9cecf;p=fceu.git

diff --git a/mappers/25.c b/mappers/25.c
index 0735b9b..37e2742 100644
--- a/mappers/25.c
+++ b/mappers/25.c
@@ -1,7 +1,7 @@
 /* FCE Ultra - NES/Famicom Emulator
  *
  * Copyright notice for this file:
- *  Copyright (C) 2002 Ben Parnell
+ *  Copyright (C) 2002 Xodnizel
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -16,6 +16,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * (VRC4 mapper)
  */
 
 #include "mapinc.h"
@@ -24,70 +25,84 @@
 #define K4IRQ mapbyte1[1]
 #define K4sel mapbyte1[0]
 
-DECLFW(Mapper25_write)
+static int acount=0;
+static int weirdo=0;
+static DECLFW(Mapper25_write)
 {
-	A=(A&0xF003)|((A&0xC)>>2);
+        if(A==0xC007)
+		{
+			weirdo=8; // Ganbare Goemon Gaiden does strange things!!! at the end credits
+		              // quick dirty hack, seems there is no other games with such PCB, so
+		              // we never know if it will not work for something else lol
+			VROM_BANK1(0x0000,0xFC);
+			VROM_BANK1(0x0400,0xFD);
+			VROM_BANK1(0x0800,0xFF);
+		}
 
-	if((A&0xF000)==0xA000)
-	{
-	  ROM_BANK8(0xA000,V);
-          X6502_Rebase();
-	}
-	else if(A>=0xB000 && A<=0xEFFF)
-	{
+        A=(A&0xF003)|((A&0xC)>>2);
+
+        if((A&0xF000)==0xA000)
+          ROM_BANK8(0xA000,V);
+        else if(A>=0xB000 && A<=0xEFFF)
+        {
          int x=(A&1)|((A-0xB000)>>11);
 
          K4buf[x]&=(0xF0)>>((A&2)<<1);
          K4buf[x]|=(V&0xF)<<((A&2)<<1);
-         VROM_BANK1(x<<10,K4buf[x]);
-	}
-	else if((A&0xF000)==0x8000)
-	{
+		 if(weirdo)
+    	  weirdo--;
+		 else
+           VROM_BANK1(x<<10,K4buf[x]);
+        }
+        else if((A&0xF000)==0x8000)
+        {
          if(K4sel&2)
           ROM_BANK8(0xC000,V);
          else
           ROM_BANK8(0x8000,V);
-         X6502_Rebase();
-	}
-	else switch(A)
-	{
-	 case 0x9000:switch(V&0x3)
-	             {
-        	      case 0:MIRROR_SET(0);break;
-	              case 1:MIRROR_SET(1);break;
-	              case 2:onemir(0);break;
-	              case 3:onemir(1);break;
-         	     }
-	             break;
-	 case 0x9001:if((K4sel&2)!=(V&2))
-        	     {
-             	      uint8 swa;
-	              swa=PRGBankList[0];
-         	      ROM_BANK8(0x8000,PRGBankList[2]);
-	              ROM_BANK8(0xc000,swa);
-                      X6502_Rebase();
-	             }
-        	     K4sel=V;
-	             break;
-	case 0xf000:IRQLatch&=0xF0;IRQLatch|=V&0xF;break;
-	case 0xf002:IRQLatch&=0x0F;IRQLatch|=V<<4;break;
-	case 0xf001:IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;break;
-	case 0xf003:IRQa=K4IRQ;break;
+        }
+        else switch(A)
+        {
+         case 0x9000:switch(V&0x3)
+                     {
+                      case 0:MIRROR_SET(0);break;
+                      case 1:MIRROR_SET(1);break;
+                      case 2:onemir(0);break;
+                      case 3:onemir(1);break;
+                      }
+                     break;
+         case 0x9001:if((K4sel&2)!=(V&2))
+                     {
+                           uint8 swa;
+                      swa=PRGBankList[0];
+                       ROM_BANK8(0x8000,PRGBankList[2]);
+                      ROM_BANK8(0xc000,swa);
+                     }
+                     K4sel=V;
+                     break;
+        case 0xf000:IRQLatch&=0xF0;IRQLatch|=V&0xF;break;
+        case 0xf002:IRQLatch&=0x0F;IRQLatch|=V<<4;break;
+        case 0xf001:IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;acount=0;X6502_IRQEnd(FCEU_IQEXT);break;
+        case 0xf003:IRQa=K4IRQ;X6502_IRQEnd(FCEU_IQEXT);break;
  }
 }
 
 static void FP_FASTAPASS(1) KonamiIRQHook(int a)
 {
-  static int count=0;
-  #define LCYCS 114
+//  #define LCYCS ((227*2))
+  #define LCYCS 341
   if(IRQa)
   {
-   count+=a;
-   if(count>=LCYCS)
+   acount+=a*3;
+  // acount+=a*4;
+   if(acount>=LCYCS)
    {
-    doagainbub:count-=LCYCS;IRQCount++;
-    if(IRQCount&0x100) {count=0;TriggerIRQ();IRQCount=IRQLatch;}
-    if(count>=LCYCS) goto doagainbub;
+    doagainbub:acount-=LCYCS;IRQCount++;
+    if(IRQCount&0x100)
+    {//acount=0;
+     X6502_IRQBegin(FCEU_IQEXT);IRQCount=IRQLatch;
+        }
+    if(acount>=LCYCS) goto doagainbub;
    }
  }
 }