merge PCM code from FCEUX

[fceu.git] / mappers / 228.c

diff --git a/mappers/228.c b/mappers/228.c
index 741bab0..d08485a 100644 (file)
--- a/mappers/228.c
+++ b/mappers/228.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
@@ -20,13 +20,28 @@
 
 #include "mapinc.h"
 
+//16 bits of ram in total
+//only use bottom 4 bits as ram though
+static uint8 mapper228_ram[4];
+
+static DECLFR(Mapper228_read)
+{
+    return mapper228_ram[A & 3] & 0xF;
+}
+
 static DECLFW(Mapper228_write)
 {
  uint32 page,pagel,pageh;
 
+    //write to ram
+    if (A < 0x6000)
+    {
+        mapper228_ram[A & 3] = V;
+        return;
+    }
  MIRROR_SET((A>>13)&1);
-
  page=(A>>7)&0x3F;
+
  if((page&0x30)==0x30)
   page-=0x10;
  
@@ -40,13 +55,16 @@ static DECLFW(Mapper228_write)
 
 static void A52Reset(void)
 {
- Mapper228_write(0,0);
+    Mapper228_write(0x8000, 0);
 }
 
 void Mapper228_init(void)
 {
   MapperReset=A52Reset;
   A52Reset();
-  SetWriteHandler(0x8000,0xffff,Mapper228_write);
+    SetWriteHandler(0x8000, 0xFFFF, Mapper228_write);
+    SetWriteHandler(0x4020, 0x5FFF, Mapper228_write);
+    SetReadHandler (0x4020, 0x5FFF, Mapper228_read);
+    AddExState(mapper228_ram, 4, 0, "MRAM");
 }