mappers/217.c

   1 /*
   2 #include "mapinc.h"
   3
   4 static uint8 cmdin;
   5 static uint8 cmd;
   6 static uint8 regs[8];
   7 static uint8 master,chrm;
   8
   9 static void DoPRG217(void)
  10 {
  11  if(master&0x80)
  12  {
  13    setprg16(0x8000,master&0x1F);
  14    setprg16(0xc000,master&0x1F);
  15  }
  16  else
  17  {
  18    setprg8(0x8000,regs[1]);
  19    setprg8(0xA000,regs[3]);
  20    setprg8(0xC000,~1);
  21    setprg8(0xE000,~0);
  22  }
  23 }
  24
  25 static void DoCHR217(void)
  26 {
  27  uint32 base=(cmd&0x80)<<5;
  28  int orie=(chrm&0x4)<<6;
  29
  30  setchr2(0x0000^base,(orie|regs[0])>>1);
  31  setchr2(0x0800^base,(orie|regs[7])>>1);
  32
  33  setchr1(0x1000,orie|regs[5]);
  34  setchr1(0x1400,orie|regs[2]);
  35  setchr1(0x1800,orie|regs[6]);
  36  setchr1(0x1c00,orie|regs[4]);
  37 }
  38
  39 static DECLFW(Write217_write)
  40 {
  41 // if(A==0x5000)
  42 // {
  43 //  master=V;
  44 //  DoPRG217();
  45 // }
  46 // else if(A==0x5001)
  47 // {
  48 //  chrm=V;
  49 //  DoCHR217();
  50 // }
  51 // else if(A==0x5007)
  52 // {
  53 // }
  54
  55  switch(A&0xE001)
  56  {
  57   case 0x4000:master=V;DoPRG217();break;
  58   case 0x8000:IRQCount=V;break;
  59   case 0xc001:break;
  60   case 0xe000:X6502_IRQEnd(FCEU_IQEXT);break;
  61   case 0xe001:break;
  62   case 0xa001:setmirror((V&1)^1);break;
  63   case 0x8001:cmd=V;cmdin=1;DoPRG217();DoCHR217();break;
  64   case 0xa000:if(!cmdin) break;
  65               regs[cmd&7]=V;
  66               DoPRG217();
  67               DoCHR217();
  68               cmdin=0;
  69               break;
  70  }
  71 }
  72
  73 static void hooko217(void)
  74 {
  75  if(IRQCount)
  76  {
  77   IRQCount--;
  78   if(!IRQCount)
  79   {
  80      X6502_IRQBegin(FCEU_IQEXT);
  81   }
  82  }
  83 }
  84
  85 void Mapper217_init(void)
  86 {
  87   int x;
  88   for(x=0;x<8;x++) regs[x]=0;
  89   master=chrm=cmd=cmdin=IRQCount=0;
  90   GameHBIRQHook=hooko217;
  91   SetReadHandler(0x8000,0xFFFF,CartBR);
  92   SetWriteHandler(0x5000,0xFFFF,Write217_write);
  93   DoPRG217();
  94   DoCHR217();
  95 }
  96 */