mappers/27.c

   1 #include "mapinc.h"\r
   2 \r
   3 static uint32 regchr[9];\r
   4 \r
   5 static DECLFW(Mapper27_write)\r
   6 {\r
   7  A&=0xF00F;\r
   8  int regnum;\r
   9  if((A>=0xB000) && (A<=0xE003)) {\r
  10     regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1);\r
  11     if(A&1)\r
  12        regchr[regnum]=(regchr[regnum]&0x0F)|(V<<4);\r
  13     else\r
  14        regchr[regnum]=(regchr[regnum]&0xFF0)|(V&0xF);\r
  15     VROM_BANK1(regnum<<10,regchr[regnum]);\r
  16  }\r
  17  switch(A)\r
  18  {\r
  19   case 0x8000: if(regchr[8]&2)\r
  20                   ROM_BANK8(0xc000,V);\r
  21                else\r
  22                   ROM_BANK8(0x8000,V);\r
  23                break;\r
  24   case 0xA000: ROM_BANK8(0xa000,V); break;\r
  25   case 0x9000:\r
  26                switch(V&3){\r
  27                   case 0:setmirror(MI_V);break;\r
  28                   case 1:setmirror(MI_H);break;\r
  29                   case 2:setmirror(MI_0);break;\r
  30                   case 3:setmirror(MI_1);break;\r
  31                }\r
  32   case 0x9002: regchr[8]=V; break;\r
  33   case 0xF000: //X6502_IRQEnd(FCEU_IQEXT);\r
  34                IRQLatch=(IRQLatch&0xF0)|(V&0x0F);\r
  35                            break;\r
  36   case 0xF001: //X6502_IRQEnd(FCEU_IQEXT);\r
  37                IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4);\r
  38                            break;\r
  39   case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1);\r
  40                            X6502_IRQEnd(FCEU_IQEXT);\r
  41                break;\r
  42   case 0xF002: IRQa=V&3;\r
  43                            if(IRQa&0x02) IRQCount=IRQLatch;\r
  44                            X6502_IRQEnd(FCEU_IQEXT);\r
  45                            break;\r
  46  }\r
  47 // if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline);\r
  48 }\r
  49 \r
  50 static void Mapper27_hb(void)\r
  51 {\r
  52 //   FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch);\r
  53         if(IRQa&0x2){\r
  54            if(IRQCount==0xFF){\r
  55              X6502_IRQBegin(FCEU_IQEXT);\r
  56               IRQCount=IRQLatch+1;\r
  57          } else {\r
  58            IRQCount++;\r
  59            }\r
  60         }\r
  61 }\r
  62 \r
  63 void Mapper27_init(void)\r
  64 {\r
  65   int i;\r
  66   for (i=0; i<9; i++) {\r
  67     regchr[i]=0;\r
  68   }\r
  69   IRQa=0;\r
  70   IRQCount=IRQLatch=0;\r
  71   SetWriteHandler(0x8000,0xffff,Mapper27_write);\r
  72   GameHBIRQHook=Mapper27_hb;\r
  73 }\r
  74 \r