X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=boards%2Fvrc7.c;fp=boards%2Fvrc7.c;h=67936dd522c8f065d2481741ded4bb55b1025015;hp=0000000000000000000000000000000000000000;hb=43725da7349c85fa13e828fdbf20cc7ac8d298d6;hpb=386f5371eb984fb9c2860c83e740890a75cd45c1

diff --git a/boards/vrc7.c b/boards/vrc7.c
new file mode 100644
index 0000000..67936dd
--- /dev/null
+++ b/boards/vrc7.c
@@ -0,0 +1,134 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2009 CaH4e3
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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
+ *
+ * YOKO Mortal Kombat V Pro, VRC7 pirate clone
+ */
+
+#include "mapinc.h"
+
+static uint8 prg[3], chr[8], mirr;
+static uint8 IRQLatch, IRQa, IRQd;
+static uint32 IRQCount, CycleCount;
+
+static SFORMAT StateRegs[]=
+{
+  {prg, 3, "PRG"},
+  {chr, 8, "CHR"},
+  {&mirr, 1, "MIRR"},
+  {&IRQa, 1, "IRQA"},
+  {&IRQd, 1, "IRQD"},
+  {&IRQLatch, 1, "IRQC"},
+  {&IRQCount, 4, "IRQC"},
+  {&CycleCount, 4, "CYCC"},
+  {0}
+};
+
+static void Sync(void)
+{
+  uint8 i;
+  setprg8(0x8000,prg[0]);
+  setprg8(0xa000,prg[1]);
+  setprg8(0xc000,prg[2]);
+  setprg8(0xe000,~0);
+  for(i=0; i<8; i++)
+    setchr1(i<<10,chr[i]);
+  switch(mirr&3)
+  {
+    case 0: setmirror(MI_V); break;
+    case 1: setmirror(MI_H); break;
+    case 2: setmirror(MI_0); break;
+    case 3: setmirror(MI_1); break;
+  }
+}
+
+static DECLFW(UNLVRC7Write)
+{
+  switch(A&0xF008)
+  {
+    case 0x8000: prg[0]=V; Sync(); break;
+    case 0x8008: prg[1]=V; Sync(); break;
+    case 0x9000: prg[2]=V; Sync(); break;
+    case 0xa000: chr[0]=V; Sync(); break;
+    case 0xa008: chr[1]=V; Sync(); break;
+    case 0xb000: chr[2]=V; Sync(); break;
+    case 0xb008: chr[3]=V; Sync(); break;
+    case 0xc000: chr[4]=V; Sync(); break;
+    case 0xc008: chr[5]=V; Sync(); break;
+    case 0xd000: chr[6]=V; Sync(); break;
+    case 0xd008: chr[7]=V; Sync(); break;
+    case 0xe000: mirr=V; Sync(); break;
+    case 0xe008:
+      IRQLatch=V;
+      X6502_IRQEnd(FCEU_IQEXT);
+      break;
+    case 0xf000:
+      IRQa=V&2;
+      IRQd=V&1;
+      if(V&2)
+        IRQCount=IRQLatch;
+      CycleCount=0;
+      X6502_IRQEnd(FCEU_IQEXT);
+      break;
+    case 0xf008:
+      if(IRQd)
+        IRQa=1;
+      else
+        IRQa=0;
+      X6502_IRQEnd(FCEU_IQEXT);
+      break;
+  } 
+}
+
+static void UNLVRC7Power(void)
+{
+  Sync();
+  SetReadHandler(0x8000,0xFFFF,CartBR);
+  SetWriteHandler(0x8000,0xFFFF,UNLVRC7Write);
+}
+
+static void UNLVRC7IRQHook(int a)
+{
+  if(IRQa)
+  {
+    CycleCount+=a*3;
+    while(CycleCount>=341)
+    {
+      CycleCount-=341;
+      IRQCount++;
+      if(IRQCount==248)
+      {
+        X6502_IRQBegin(FCEU_IQEXT);
+        IRQCount=IRQLatch;
+      }
+    }
+  }
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void UNLVRC7_Init(CartInfo *info)
+{
+  info->Power=UNLVRC7Power;
+  MapIRQHook=UNLVRC7IRQHook;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}