/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "mapinc.h"

static uint8 cmd;
static uint8 latch[8];

static void S74LS374MSync(uint8 mirr)
{
  switch(mirr&3)
  {
    case 0:setmirror(MI_V);break;
    case 1:setmirror(MI_H);break;
    case 2:setmirrorw(0,1,1,1);break;
    case 3:setmirror(MI_0);break;
  }
}

static void S74LS374NSynco(void)
{
  setprg32(0x8000,latch[0]);
  setchr8(latch[1]|latch[3]|latch[4]);
  S74LS374MSync(latch[2]);
}

static DECLFW(S74LS374NWrite)
{
  A&=0x4101;
  if(A==0x4100)
    cmd=V&7;
  else
  {
    switch(cmd)
    {
      case 2:latch[3]=(V&1)<<3;break;
      case 4:latch[4]=(V&1)<<2;break;
      case 5:latch[0]=V&7;break;
      case 6:latch[1]=V&3;break;
      case 7:latch[2]=V>>1;break;
    }
    S74LS374NSynco();
  }
}

static void S74LS374NPower(void)
{
   latch[0]=latch[1]=latch[2]=latch[3]=latch[4]=0;
   S74LS374NSynco();
   SetReadHandler(0x8000,0xFFFF,CartBR);
   SetWriteHandler(0x4100,0x7FFF,S74LS374NWrite);
}

static void S74LS374NRestore(int version)
{
   S74LS374NSynco();
}

void S74LS374N_Init(CartInfo *info)
{
  info->Power=S74LS374NPower;
  GameStateRestore=S74LS374NRestore;
  AddExState(latch, 5, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
}

static void S74LS374NASynco(void)
{
  setprg32(0x8000,latch[0]);
  setchr8(latch[1]);
  S74LS374MSync(latch[2]);
}

static DECLFW(S74LS374NAWrite)
{
  A&=0x4101;
  if(A==0x4100)
    cmd=V&7;
  else
  {
    switch(cmd)
    {
      case 0:latch[0]=0;latch[1]=3;break;
      case 2:latch[3]=(V&1)<<3;break;
      case 4:latch[1]=(latch[1]&6)|(V&3);break;
      case 5:latch[0]=V&1;break;
      case 6:latch[1]=(latch[1]&1)|latch[3]|((V&3)<<1);break;
      case 7:latch[2]=V&1;break;
    }
    S74LS374NASynco();
  }
}

static void S74LS374NAPower(void)
{
   latch[0]=latch[2]=latch[3]=latch[4]=0;
   latch[1]=3;
   S74LS374NASynco();
   SetReadHandler(0x8000,0xFFFF,CartBR);
   SetWriteHandler(0x4100,0x7FFF,S74LS374NAWrite);
}

void S74LS374NA_Init(CartInfo *info)
{
  info->Power=S74LS374NAPower;
  GameStateRestore=S74LS374NRestore;
  AddExState(latch, 5, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
}

static int type;
static void S8259Synco(void)
{
  int x;
  setprg32(0x8000,latch[5]&7);

  if(!UNIFchrrama)        // No CHR RAM?  Then BS'ing is ok.
  {
    for(x=0;x<4;x++)
    {
      int bank;
      if(latch[7]&1)
        bank=(latch[0]&0x7)|((latch[4]&7)<<3);
      else
        bank=(latch[x]&0x7)|((latch[4]&7)<<3);
      switch (type)
      {
        case 00: bank=(bank<<1)|(x&1); setchr2(0x800*x,bank); break;
        case 01: setchr2(0x800*x,bank); break;
        case 02: bank=(bank<<2)|(x&3); setchr2(0x800*x,bank); break;
        case 03: bank=latch[x]&7;
                 switch (x&3)
                 {
                   case 01: bank|=(latch[4]&1)<<4;break;
                   case 02: bank|=(latch[4]&2)<<3;break;
                   case 03: bank|=((latch[4]&4)<<2)|((latch[6]&1)<<3);break;
                 }
                 setchr1(0x400*x,bank);
                 setchr4(0x1000,~0);
                 break;
      }
    }
  }
  if(!(latch[7]&1))
    S74LS374MSync(latch[7]>>1);
  else
    setmirror(MI_V);
}

static DECLFW(S8259Write)
{
  A&=0x4101;
  if(A==0x4100)
    cmd=V;
  else
  {
    latch[cmd&7]=V;
    S8259Synco();
  }
}

static void S8259Reset(void)
{
  int x;
  cmd=0;

  for(x=0;x<8;x++) latch[x]=0;
  setchr8(0);

  S8259Synco();
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x4100,0x7FFF,S8259Write);
}

static void S8259Restore(int version)
{
  S8259Synco();
}

void S8259A_Init(CartInfo *info) // Kevin's Horton 141 mapper
{
  info->Power=S8259Reset;
  GameStateRestore=S8259Restore;
  AddExState(latch, 8, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
  type=0;
}

void S8259B_Init(CartInfo *info) // Kevin's Horton 138 mapper
{
  info->Power=S8259Reset;
  GameStateRestore=S8259Restore;
  AddExState(latch, 8, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
  type=1;
}

void S8259C_Init(CartInfo *info) // Kevin's Horton 139 mapper
{
  info->Power=S8259Reset;
  GameStateRestore=S8259Restore;
  AddExState(latch, 8, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
  type=2;
}

void S8259D_Init(CartInfo *info) // Kevin's Horton 137 mapper
{
  info->Power=S8259Reset;
  GameStateRestore=S8259Restore;
  AddExState(latch, 8, 0, "LATC");
  AddExState(&cmd, 1, 0, "CMD");
  type=3;
}

static void(*WSync)(void);

static DECLFW(SAWrite)
{
  if(A&0x100)
  {
    latch[0]=V;
    WSync();
  }
}

static void SAPower(void)
{
  latch[0]=0;
  WSync();
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x4100,0x5FFF,SAWrite);
}

static void SARestore(int version)
{
  WSync();
}

static DECLFW(SADWrite)
{
  latch[0]=V;
  WSync();
}

static void SADPower(void)
{
  latch[0]=0;
  WSync();
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x8000,0xFFFF,SADWrite);
}

static void SA0161MSynco()
{
  setprg32(0x8000,(latch[0]>>3)&1);
  setchr8(latch[0]&7);
}

static void SA72007Synco()
{
  setprg32(0x8000,0);
  setchr8(latch[0]>>7);
}

static void SA72008Synco()
{
  setprg32(0x8000,(latch[0]>>2)&1);
  setchr8(latch[0]&3);
}

static void SA0037Synco()
{
  setprg32(0x8000,(latch[0]>>3)&1);
  setchr8(latch[0]&7);
}

void SA0161M_Init(CartInfo *info)
{
  WSync=SA0161MSynco;
  GameStateRestore=SARestore;
  info->Power=SAPower;
  AddExState(&latch[0], 1, 0, "LATC");
}

void SA72007_Init(CartInfo *info)
{
  WSync=SA72007Synco;
  GameStateRestore=SARestore;
  info->Power=SAPower;
  AddExState(&latch[0], 1, 0, "LATC");
}

void SA72008_Init(CartInfo *info)
{
  WSync=SA72008Synco;
  GameStateRestore=SARestore;
  info->Power=SAPower;
  AddExState(&latch[0], 1, 0, "LATC");
}

void SA0036_Init(CartInfo *info)
{
  WSync=SA72007Synco;
  GameStateRestore=SARestore;
  info->Power=SADPower;
  AddExState(&latch[0], 1, 0, "LATC");
}

void SA0037_Init(CartInfo *info)
{
  WSync=SA0037Synco;
  GameStateRestore=SARestore;
  info->Power=SADPower;
  AddExState(&latch[0], 1, 0, "LATC");
}

static void TCU01Synco()
{
  setprg32(0x8000,(latch[0]>>2)&1);
  setchr8((latch[0]>>3)&0xF);
}

static DECLFW(TCWrite)
{
  if((A&0x103)==0x102)
    latch[0]=V;
  TCU01Synco();
}

static void TCU01Reset(void)
{
  latch[0]=0;
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x4100,0xFFFF,TCWrite);
  TCU01Synco();
}

static void TCU01Restore(int version)
{
  TCU01Synco();
}

void TCU01_Init(CartInfo *info)
{
  GameStateRestore=TCU01Restore;
  info->Power=TCU01Reset;
  AddExState(&latch[0], 1, 0, "LATC");
}

static DECLFR(TCA01Read)
{
  uint8 ret;
  if((A&0x4100)==0x4100)
    ret=(X.DB&0xC0)|((~A)&0x3F);
  else
    ret=X.DB;
  return ret;
}

static void TCA01Reset(void)
{
  setprg16(0x8000,0);
  setprg16(0xC000,1);
  setchr8(0);
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetReadHandler(0x4100,0x5FFF,TCA01Read);
}

void TCA01_Init(CartInfo *info)
{
  info->Power=TCA01Reset;
}
