mappers/215.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 DoPRG215(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[4]); 6
  19    setprg8(0xA000,regs[6]); 7   0, 2, 5, 3, 6, 1, 7, 4
  20    setprg8(0xC000,~1);
  21    setprg8(0xE000,~0);
  22  }
  23
  24 }
  25
  26 static void DoCHR215(void)
  27 {
  28  uint32 base=(cmd&0x80)<<5;
  29  int orie=(chrm&0x4)<<6;
  30
  31  setchr2(0x0000^base,(orie|regs[0])>>1); 0
  32  setchr2(0x0800^base,(orie|regs[5])>>1); 1
  33
  34  setchr1(0x1000,orie|regs[1]); 2
  35  setchr1(0x1400,orie|regs[3]); 3
  36  setchr1(0x1800,orie|regs[7]); 4
  37  setchr1(0x1c00,orie|regs[2]); 5
  38 }
  39
  40 static DECLFW(Write215_write)
  41 {
  42  switch(A&0xF001)
  43  {
  44   case 0xF001:IRQCount=V+2;break;
  45   case 0xF000:X6502_IRQEnd(FCEU_IQEXT);break;
  46  }
  47  if(A==0x5000)
  48  {
  49   master=V;
  50   DoPRG215();
  51 //  DoCHR215();
  52  }
  53  else if(A==0x5001)
  54  {
  55   chrm=V;
  56   DoCHR215();
  57  }
  58  else
  59  switch(A&0xE001)
  60  {
  61   case 0xC000:setmirror(((V|(V>>7))&1)^1);break;
  62   case 0xa000:cmd=V;cmdin=1;DoCHR215();break;
  63   case 0x8001:if(!cmdin) break;
  64               regs[cmd&7]=V;
  65               DoPRG215();
  66               DoCHR215();
  67               cmdin=0;
  68               break;
  69  }
  70 }
  71
  72 static void hooko215(void)
  73 {
  74  if(IRQCount)
  75  {
  76   IRQCount--;
  77   if(!IRQCount)
  78   {
  79      X6502_IRQBegin(FCEU_IQEXT);
  80   }
  81  }
  82 }
  83
  84 void Mapper215_init(void)
  85 {
  86   int x;
  87   for(x=0;x<8;x++) regs[x]=0;
  88   master=chrm=cmd=cmdin=IRQCount=0;
  89   GameHBIRQHook=hooko215;
  90   SetReadHandler(0x8000,0xFFFF,CartBR);
  91   SetWriteHandler(0x5000,0xFFFF,Write215_write);
  92   DoPRG215();
  93   DoCHR215();
  94 }
  95
  96 */