updated bords/mappers/stuff to 0.98.15, lots of them got broken, asmcore support...

[fceu.git] / boards / 8237.c

diff --git a/boards/8237.c b/boards/8237.c
new file mode 100644 (file)
index 0000000..5b4e2df
--- /dev/null
+++ b/boards/8237.c
@@ -0,0 +1,93 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2005 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
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static uint8 cmdin;
+static uint8 UNL8237_perm[8] = {0, 2, 6, 1, 7, 3, 4, 5};
+
+static void UNL8237CW(uint32 A, uint8 V)
+{
+  setchr1(A,((EXPREGS[1]&4)<<6)|V);
+}
+
+static void UNL8237PW(uint32 A, uint8 V)
+{
+  if(EXPREGS[0]&0x80)
+  {
+    if(EXPREGS[0]&0x20)
+      setprg32(0x8000,(EXPREGS[0]&0xF)>>1);
+    else
+    {
+      setprg16(0x8000,(EXPREGS[0]&0x1F));
+      setprg16(0xC000,(EXPREGS[0]&0x1F));
+    }
+  }
+  else
+    setprg8(A,V&0x3F);
+}
+
+static DECLFW(UNL8237Write)
+{
+  if((A&0xF000)==0xF000)
+    IRQCount=V;
+  else if((A&0xF000)==0xE000)
+    X6502_IRQEnd(FCEU_IQEXT);
+  else switch(A&0xE001)
+  {
+    case 0x8000: setmirror(((V|(V>>7))&1)^1); break;
+    case 0xA000: MMC3_CMDWrite(0x8000,(V&0xC0)|(UNL8237_perm[V&7])); cmdin=1; break;
+    case 0xC000: if(cmdin)
+                 {
+                   MMC3_CMDWrite(0x8001,V);
+                   cmdin=0;
+                 }
+                 break;
+  }
+}
+
+static DECLFW(UNL8237ExWrite)
+{
+  switch(A)
+  {
+    case 0x5000: EXPREGS[0]=V; FixMMC3PRG(MMC3_cmd); break;
+    case 0x5001: EXPREGS[1]=V; FixMMC3CHR(MMC3_cmd); break;
+  }
+}
+
+static void UNL8237Power(void)
+{
+  IRQa=1;
+  EXPREGS[0]=EXPREGS[1]=0;
+  GenMMC3Power();
+  SetWriteHandler(0x8000,0xFFFF,UNL8237Write);
+  SetWriteHandler(0x5000,0x7FFF,UNL8237ExWrite);
+}
+
+void UNL8237_Init(CartInfo *info)
+{
+  GenMMC3_Init(info, 256, 256, 0, 0);
+  cwrap=UNL8237CW;
+  pwrap=UNL8237PW;
+  info->Power=UNL8237Power;
+  AddExState(EXPREGS, 3, 0, "EXPR");
+  AddExState(&cmdin, 1, 0, "CMDIN");
+}