void Map4_Set_PPU_Banks()
{
if ( S.NesHeader.VROMSize > 0 )
{
if ( Map4_Chr_Swap() )
{
W.PPUBANK[0] = VROMPAGE(MS4.PPU[2] % (Map4_Vsz));
W.PPUBANK[1] = VROMPAGE(MS4.PPU[3] % (Map4_Vsz));
W.PPUBANK[2] = VROMPAGE(MS4.PPU[4] % (Map4_Vsz));
W.PPUBANK[3] = VROMPAGE(MS4.PPU[5] % (Map4_Vsz));
W.PPUBANK[4] = VROMPAGE((MS4.PPU[0] ) % (Map4_Vsz));
W.PPUBANK[5] = VROMPAGE((MS4.PPU[0]+1) % (Map4_Vsz));
W.PPUBANK[6] = VROMPAGE((MS4.PPU[1] ) % (Map4_Vsz));
W.PPUBANK[7] = VROMPAGE((MS4.PPU[1]+1) % (Map4_Vsz));
} else {
W.PPUBANK[4] = VROMPAGE(MS4.PPU[2] % (Map4_Vsz));
W.PPUBANK[5] = VROMPAGE(MS4.PPU[3] % (Map4_Vsz));
W.PPUBANK[6] = VROMPAGE(MS4.PPU[4] % (Map4_Vsz));
W.PPUBANK[7] = VROMPAGE(MS4.PPU[5] % (Map4_Vsz));
W.PPUBANK[0] = VROMPAGE((MS4.PPU[0] ) % (Map4_Vsz));
W.PPUBANK[1] = VROMPAGE((MS4.PPU[0]+1) % (Map4_Vsz));
W.PPUBANK[2] = VROMPAGE((MS4.PPU[1] ) % (Map4_Vsz));
W.PPUBANK[3] = VROMPAGE((MS4.PPU[1]+1) % (Map4_Vsz));
}
NESCore_Develop_Character_Data();
}
else
{
W.PPUBANK[ 0 ] = CRAMPAGE( 0 );
W.PPUBANK[ 1 ] = CRAMPAGE( 1 );
W.PPUBANK[ 2 ] = CRAMPAGE( 2 );
W.PPUBANK[ 3 ] = CRAMPAGE( 3 );
W.PPUBANK[ 4 ] = CRAMPAGE( 4 );
W.PPUBANK[ 5 ] = CRAMPAGE( 5 );
W.PPUBANK[ 6 ] = CRAMPAGE( 6 );
W.PPUBANK[ 7 ] = CRAMPAGE( 7 );
NESCore_Develop_Character_Data();
}
}
void Map4_Write( word wAddr, byte bData )
{
dword dwBankNum;
switch ( wAddr & 0xe001 )
{
case 0x8000:
MS4.Regs[ 0 ] = bData;
Map4_Set_CPU_Banks();
break;
case 0x8001:
MS4.Regs[ 1 ] = bData;
dwBankNum = MS4.Regs[ 1 ];
switch ( MS4.Regs[ 0 ] & 0x07 )
{
/* Set PPU Banks */
case 0x00:
if ( S.NesHeader.VROMSize > 0 )
{
dwBankNum &= 0xfe;
MS4.PPU[0] = dwBankNum;
if ( Map4_Chr_Swap() )
{
W.PPUBANK[4] = VROMPAGE((MS4.PPU[0] ) % (Map4_Vsz));
W.PPUBANK[5] = VROMPAGE((MS4.PPU[0]+1) % (Map4_Vsz));
} else {
W.PPUBANK[0] = VROMPAGE((MS4.PPU[0] ) % (Map4_Vsz));
W.PPUBANK[1] = VROMPAGE((MS4.PPU[0]+1) % (Map4_Vsz));
}
NESCore_Develop_Character_Data();
}
break;
case 0x01:
if ( S.NesHeader.VROMSize > 0 )
{
dwBankNum &= 0xfe;
MS4.PPU[1] = dwBankNum;
if ( Map4_Chr_Swap() )
{
W.PPUBANK[6] = VROMPAGE((MS4.PPU[1] ) % (Map4_Vsz));
W.PPUBANK[7] = VROMPAGE((MS4.PPU[1]+1) % (Map4_Vsz));
} else {
W.PPUBANK[2] = VROMPAGE((MS4.PPU[1] ) % (Map4_Vsz));
W.PPUBANK[3] = VROMPAGE((MS4.PPU[1]+1) % (Map4_Vsz));
}
NESCore_Develop_Character_Data();
}
break;
case 0x02:
if ( S.NesHeader.VROMSize > 0 )
{
MS4.PPU[2] = dwBankNum;
if ( Map4_Chr_Swap() )
W.PPUBANK[0] = VROMPAGE( MS4.PPU[2] % ( Map4_Vsz ) );
else
W.PPUBANK[4] = VROMPAGE( MS4.PPU[2] % ( Map4_Vsz ) );
NESCore_Develop_Character_Data();
}
break;
case 0x03:
if ( S.NesHeader.VROMSize > 0 )
{
MS4.PPU[3] = dwBankNum;
if ( Map4_Chr_Swap() )
W.PPUBANK[1] = VROMPAGE( MS4.PPU[3] % ( Map4_Vsz ) );
else
W.PPUBANK[5] = VROMPAGE( MS4.PPU[3] % ( Map4_Vsz ) );
NESCore_Develop_Character_Data();
}
break;
case 0x04:
if ( S.NesHeader.VROMSize > 0 )
{
MS4.PPU[4] = dwBankNum;
if ( Map4_Chr_Swap() )
W.PPUBANK[2] = VROMPAGE( MS4.PPU[4] % ( Map4_Vsz ) );
else
W.PPUBANK[6] = VROMPAGE( MS4.PPU[4] % ( Map4_Vsz ) );
NESCore_Develop_Character_Data();
}
break;
case 0x05:
if ( S.NesHeader.VROMSize > 0 )
{
MS4.PPU[5] = dwBankNum;
if ( Map4_Chr_Swap() )
W.PPUBANK[3] = VROMPAGE( MS4.PPU[5] % ( Map4_Vsz ) );
else
W.PPUBANK[7] = VROMPAGE( MS4.PPU[5] % ( Map4_Vsz ) );
NESCore_Develop_Character_Data();
}
break;
/* Set ROM Banks */
case 0x06:
MS4.Prg0 = dwBankNum;
Map4_Set_CPU_Banks();
break;
case 0x07:
MS4.Prg1 = dwBankNum;
Map4_Set_CPU_Banks();
break;
}
break;
case 0xa000:
MS4.Regs[ 2 ] = bData & 1;
if (!S.ROM_FourScr)
{
if ( bData & 0x01 )
{
NESCore_Mirroring( 0 );
} else {
NESCore_Mirroring( 1 );
}
}
break;
case 0xa001:
MS4.Regs[ 3 ] = bData;
break;
case 0xe000: /* ACK IRQ */
MS4.IRQ_Enabled = 0;
break;
case 0xe001: /* Enable IRQ */
MS4.IRQ_Enabled = 1;
break;
}
/* Old IRQ Technique */
/*
if (wAddr >= 0xc000 && wAddr <= 0xdfff) {
if (wAddr % 2 == 0) {
MS4.IRQ_Counter = bData;
}
else {
MS4.IRQ_Latch = bData;
}
}
*/
if (wAddr >= 0xc000 && wAddr <= 0xdfff) {
if (wAddr % 2 == 0) {
MS4.IRQ_Latch = bData;
}
else {
MS4.IRQ_Counter = MS4.IRQ_Latch;
}
}
}
/*-------------------------------------------------------------------*/
void Map4_Set_PPU_Banks()
{
if ( NesHeader.byVRomSize > 0 )
{
if ( Map4_Chr_Swap() )
{
PPUBANK[ 0 ] = VROMPAGE( Map4_Chr4 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( Map4_Chr5 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 2 ] = VROMPAGE( Map4_Chr6 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( Map4_Chr7 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 4 ] = VROMPAGE( ( Map4_Chr01 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 5 ] = VROMPAGE( ( Map4_Chr01 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 6 ] = VROMPAGE( ( Map4_Chr23 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 7 ] = VROMPAGE( ( Map4_Chr23 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
} else {
PPUBANK[ 0 ] = VROMPAGE( ( Map4_Chr01 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( Map4_Chr01 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 2 ] = VROMPAGE( ( Map4_Chr23 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( Map4_Chr23 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 4 ] = VROMPAGE( Map4_Chr4 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 5 ] = VROMPAGE( Map4_Chr5 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 6 ] = VROMPAGE( Map4_Chr6 % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 7 ] = VROMPAGE( Map4_Chr7 % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
}
}
else
{
if ( Map4_Chr_Swap() )
{
#if 0
PPUBANK[ 0 ] = VRAMPAGE0( 0 );
PPUBANK[ 1 ] = VRAMPAGE0( 1 );
PPUBANK[ 2 ] = VRAMPAGE0( 2 );
PPUBANK[ 3 ] = VRAMPAGE0( 3 );
PPUBANK[ 4 ] = VRAMPAGE1( 0 );
PPUBANK[ 5 ] = VRAMPAGE1( 1 );
PPUBANK[ 6 ] = VRAMPAGE1( 2 );
PPUBANK[ 7 ] = VRAMPAGE1( 3 );
#else
PPUBANK[ 0 ] = CRAMPAGE( 0 );
PPUBANK[ 1 ] = CRAMPAGE( 1 );
PPUBANK[ 2 ] = CRAMPAGE( 2 );
PPUBANK[ 3 ] = CRAMPAGE( 3 );
PPUBANK[ 4 ] = CRAMPAGE( 4 );
PPUBANK[ 5 ] = CRAMPAGE( 5 );
PPUBANK[ 6 ] = CRAMPAGE( 6 );
PPUBANK[ 7 ] = CRAMPAGE( 7 );
#endif
InfoNES_SetupChr();
} else {
#if 0
PPUBANK[ 0 ] = VRAMPAGE1( 0 );
PPUBANK[ 1 ] = VRAMPAGE1( 1 );
PPUBANK[ 2 ] = VRAMPAGE1( 2 );
PPUBANK[ 3 ] = VRAMPAGE1( 3 );
PPUBANK[ 4 ] = VRAMPAGE0( 0 );
PPUBANK[ 5 ] = VRAMPAGE0( 1 );
PPUBANK[ 6 ] = VRAMPAGE0( 2 );
PPUBANK[ 7 ] = VRAMPAGE0( 3 );
#else
PPUBANK[ 0 ] = CRAMPAGE( 0 );
PPUBANK[ 1 ] = CRAMPAGE( 1 );
PPUBANK[ 2 ] = CRAMPAGE( 2 );
PPUBANK[ 3 ] = CRAMPAGE( 3 );
PPUBANK[ 4 ] = CRAMPAGE( 4 );
PPUBANK[ 5 ] = CRAMPAGE( 5 );
PPUBANK[ 6 ] = CRAMPAGE( 6 );
PPUBANK[ 7 ] = CRAMPAGE( 7 );
#endif
InfoNES_SetupChr();
}
}
}
