merge mapper code from FCEUX

[fceu.git] / mappers / 83.c

diff --git a/mappers/83.c b/mappers/83.c
index 3ab004f..ca26388 100644 (file)
--- a/mappers/83.c
+++ b/mappers/83.c
@@ -15,18 +15,19 @@
  *
  * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include "mapinc.h"
 
+static uint8 is2kbank, isnot2kbank, dipreg;
 
 /*void Mapper83_init(void)
 {             
  
 } 
 */
-static void FP_FASTAPASS(1) m83IRQHook(int a)
+static void m83IRQHook(int a)
 {
   if(IRQa)
   {
@@ -50,6 +51,11 @@ static DECLFR(rdlow)
  return mapbyte4[A&3];
 }
 
+static DECLFR(rd5000)
+{
+ return dipreg;
+}
+
 static void m83prg(void)
 {
   ROM_BANK16(0x8000,(mapbyte1[0]&0x3F)); 
@@ -58,9 +64,19 @@ static void m83prg(void)
 
 static void m83chr(void)
 {
-  int x;
-  for(x=0;x<8;x++)
-   VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4));
+  if(is2kbank&&!isnot2kbank)
+  {
+    VROM_BANK2(0x0000,mapbyte2[0]);
+    VROM_BANK2(0x0800,mapbyte2[1]);
+    VROM_BANK2(0x1000,mapbyte2[6]);
+    VROM_BANK2(0x1800,mapbyte2[7]);
+  }
+  else
+  {
+    int x;
+    for(x=0;x<8;x++)
+       VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4));
+  }
 }
 
 static DECLFW(Mapper83_write)
@@ -68,7 +84,7 @@ static DECLFW(Mapper83_write)
  //printf("$%04x:$%02x\n",A,V);
  switch(A)
  {
-  case 0x8000:
+  case 0x8000: is2kbank = 1;
   case 0xB000:
   case 0xB0FF:
   case 0xB1FF:
@@ -79,6 +95,7 @@ static DECLFW(Mapper83_write)
        }
        break;
   case 0x8100:
+              mapbyte3[0]=V&0x80;
               switch(V&0x3)
               {
               case 0x00:MIRROR_SET2(1);break;
@@ -88,16 +105,16 @@ static DECLFW(Mapper83_write)
               }
               break;
   case 0x8200:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break;
-  case 0x8201:IRQa=1;IRQCount&=0xFF;IRQCount|=V<<8;break;
+  case 0x8201:IRQa=mapbyte3[0];IRQCount&=0xFF;IRQCount|=V<<8;break;
   case 0x8300:ROM_BANK8(0x8000,V);break;
   case 0x8301:ROM_BANK8(0xA000,V);break;
   case 0x8302:ROM_BANK8(0xC000,V);break;
   case 0x8310:mapbyte2[0]=V;m83chr();break;
   case 0x8311:mapbyte2[1]=V;m83chr();break;
-  case 0x8312:mapbyte2[2]=V;m83chr();break;
-  case 0x8313:mapbyte2[3]=V;m83chr();break;
-  case 0x8314:mapbyte2[4]=V;m83chr();break;
-  case 0x8315:mapbyte2[5]=V;m83chr();break;
+  case 0x8312:mapbyte2[2]=V;isnot2kbank = 1;m83chr();break; // 2 mappers in one :)
+  case 0x8313:mapbyte2[3]=V;isnot2kbank = 1;m83chr();break;
+  case 0x8314:mapbyte2[4]=V;isnot2kbank = 1;m83chr();break;
+  case 0x8315:mapbyte2[5]=V;isnot2kbank = 1;m83chr();break;
   case 0x8316:mapbyte2[6]=V;m83chr();break;
   case 0x8317:mapbyte2[7]=V;m83chr();break;
   case 0x8318:mapbyte1[1]=V;m83prg();break;
@@ -106,13 +123,23 @@ static DECLFW(Mapper83_write)
  
 }
 
+static void m83Reset(void)
+{
+ dipreg^=1;
+}
+
 void Mapper83_init(void)
 {
+ is2kbank = 0;
+ isnot2kbank = 0;
+ dipreg = 0;
  ROM_BANK8(0xc000,0x1e);
  ROM_BANK8(0xe000,0x1f);
 
  MapIRQHook=m83IRQHook;
+ MapperReset=m83Reset;
 
+ SetReadHandler(0x5000,0x5000,rd5000); // title scren dip switch
  SetReadHandler(0x5100,0x5103,rdlow);
  SetWriteHandler(0x5100,0x5103,wrlow);
  SetWriteHandler(0x8000,0xffff,Mapper83_write);