X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mappers%2F27.c;fp=mappers%2F27.c;h=9dbe5cf2d17d413d88ac5c9d7f88f11075080c53;hb=d97315ac0bca825d2d50a44453bc5652946e2c67;hp=0000000000000000000000000000000000000000;hpb=890e37ba2b8ea1c7593dc05926d7431e3bd00bfb;p=fceu.git

diff --git a/mappers/27.c b/mappers/27.c
new file mode 100644
index 0000000..9dbe5cf
--- /dev/null
+++ b/mappers/27.c
@@ -0,0 +1,74 @@
+#include "mapinc.h"
+
+static uint32 regchr[9];
+
+static DECLFW(Mapper27_write)
+{
+ A&=0xF00F;
+ int regnum;
+ if((A>=0xB000) && (A<=0xE003)) {
+    regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1);
+    if(A&1)
+       regchr[regnum]=(regchr[regnum]&0x0F)|(V<<4);
+    else
+       regchr[regnum]=(regchr[regnum]&0xFF0)|(V&0xF);
+    VROM_BANK1(regnum<<10,regchr[regnum]);
+ }
+ switch(A)
+ {
+  case 0x8000: if(regchr[8]&2)
+                  ROM_BANK8(0xc000,V);
+               else
+                  ROM_BANK8(0x8000,V);
+               break;
+  case 0xA000: ROM_BANK8(0xa000,V); break;
+  case 0x9000:
+               switch(V&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;
+               }
+  case 0x9002: regchr[8]=V; break;
+  case 0xF000: //X6502_IRQEnd(FCEU_IQEXT);
+               IRQLatch=(IRQLatch&0xF0)|(V&0x0F);
+                           break;
+  case 0xF001: //X6502_IRQEnd(FCEU_IQEXT);
+               IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4);
+                           break;
+  case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1);
+                           X6502_IRQEnd(FCEU_IQEXT);
+               break;
+  case 0xF002: IRQa=V&3;
+                           if(IRQa&0x02) IRQCount=IRQLatch;
+                           X6502_IRQEnd(FCEU_IQEXT);
+                           break;
+ }
+// if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline);
+}
+
+static void Mapper27_hb(void)
+{
+//   FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch);
+        if(IRQa&0x2){
+           if(IRQCount==0xFF){
+             X6502_IRQBegin(FCEU_IQEXT);
+              IRQCount=IRQLatch+1;
+         } else {
+           IRQCount++;
+           }
+        }
+}
+
+void Mapper27_init(void)
+{
+  int i;
+  for (i=0; i<9; i++) {
+    regchr[i]=0;
+  }
+  IRQa=0;
+  IRQCount=IRQLatch=0;
+  SetWriteHandler(0x8000,0xffff,Mapper27_write);
+  GameHBIRQHook=Mapper27_hb;
+}
+