X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mappers%2F228.c;h=d08485aab66eb5f3c527327f3be6e5da7d85828c;hb=5bd16b94320afa9dfba4985f5d69c2d84bae4c33;hp=bfae3a63db3319eba82668f0eafb214dbe39f095;hpb=d97315ac0bca825d2d50a44453bc5652946e2c67;p=fceu.git

diff --git a/mappers/228.c b/mappers/228.c
index bfae3a6..d08485a 100644
--- a/mappers/228.c
+++ b/mappers/228.c
@@ -20,14 +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;
- //printf("%04x\n",A);
+
  if((page&0x30)==0x30)
   page-=0x10;
  
@@ -41,13 +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");
 }