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[fceu.git] / mappers / 27.c

#include "mapinc.h"\r
\r
static uint32 regchr[9];\r
\r
static DECLFW(Mapper27_write)\r
{\r
 A&=0xF00F;\r
 int regnum;\r
 if((A>=0xB000) && (A<=0xE003)) {\r
    regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1);\r
    if(A&1)\r
       regchr[regnum]=(regchr[regnum]&0x0F)|(V<<4);\r
    else\r
       regchr[regnum]=(regchr[regnum]&0xFF0)|(V&0xF);\r
    VROM_BANK1(regnum<<10,regchr[regnum]);\r
 }\r
 switch(A)\r
 {\r
  case 0x8000: if(regchr[8]&2)\r
                  ROM_BANK8(0xc000,V);\r
               else\r
                  ROM_BANK8(0x8000,V);\r
               break;\r
  case 0xA000: ROM_BANK8(0xa000,V); break;\r
  case 0x9000:\r
               switch(V&3){\r
                  case 0:setmirror(MI_V);break;\r
                  case 1:setmirror(MI_H);break;\r
                  case 2:setmirror(MI_0);break;\r
                  case 3:setmirror(MI_1);break;\r
               }\r
  case 0x9002: regchr[8]=V; break;\r
  case 0xF000: //X6502_IRQEnd(FCEU_IQEXT);\r
               IRQLatch=(IRQLatch&0xF0)|(V&0x0F);\r
                           break;\r
  case 0xF001: //X6502_IRQEnd(FCEU_IQEXT);\r
               IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4);\r
                           break;\r
  case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1);\r
                           X6502_IRQEnd(FCEU_IQEXT);\r
               break;\r
  case 0xF002: IRQa=V&3;\r
                           if(IRQa&0x02) IRQCount=IRQLatch;\r
                           X6502_IRQEnd(FCEU_IQEXT);\r
                           break;\r
 }\r
// if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline);\r
}\r
\r
static void Mapper27_hb(void)\r
{\r
//   FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch);\r
        if(IRQa&0x2){\r
           if(IRQCount==0xFF){\r
             X6502_IRQBegin(FCEU_IQEXT);\r
              IRQCount=IRQLatch+1;\r
         } else {\r
           IRQCount++;\r
           }\r
        }\r
}\r
\r
void Mapper27_init(void)\r
{\r
  int i;\r
  for (i=0; i<9; i++) {\r
    regchr[i]=0;\r
  }\r
  IRQa=0;\r
  IRQCount=IRQLatch=0;\r
  SetWriteHandler(0x8000,0xffff,Mapper27_write);\r
  GameHBIRQHook=Mapper27_hb;\r
}\r
\r