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/*===================================================================*/
/* */
/* Mapper 64 (Tengen RAMBO-1) */
/* */
/*===================================================================*/
BYTE Map64_Cmd;
BYTE Map64_Prg;
BYTE Map64_Chr;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 64 */
/*-------------------------------------------------------------------*/
void Map64_Init()
{
/* Initialize Mapper */
MapperInit = Map64_Init;
/* Write to Mapper */
MapperWrite = Map64_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map0_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set ROM Banks */
ROMBANK0 = ROMLASTPAGE( 0 );
ROMBANK1 = ROMLASTPAGE( 0 );
ROMBANK2 = ROMLASTPAGE( 0 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Initialize state flag */
Map64_Cmd = 0x00;
Map64_Prg = 0x00;
Map64_Chr = 0x00;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 64 Write Function */
/*-------------------------------------------------------------------*/
void Map64_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr )
{
case 0x8000:
/* Set state flag */
Map64_Cmd = byData & 0x0f;
Map64_Prg = ( byData & 0x40 ) >> 6;
Map64_Chr = ( byData & 0x80 ) >> 7;
break;
case 0x8001:
switch ( Map64_Cmd )
{
case 0x00:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 4 ] = VROMPAGE( byData );
PPUBANK[ 5 ] = VROMPAGE( byData + 1 );
} else {
PPUBANK[ 0 ] = VROMPAGE( byData );
PPUBANK[ 1 ] = VROMPAGE( byData + 1 );
}
InfoNES_SetupChr();
break;
case 0x01:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 6 ] = VROMPAGE( byData );
PPUBANK[ 7 ] = VROMPAGE( byData + 1 );
} else {
PPUBANK[ 2 ] = VROMPAGE( byData );
PPUBANK[ 3 ] = VROMPAGE( byData + 1 );
}
InfoNES_SetupChr();
break;
case 0x02:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 0 ] = VROMPAGE( byData );
} else {
PPUBANK[ 4 ] = VROMPAGE( byData );
}
InfoNES_SetupChr();
break;
case 0x03:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 1 ] = VROMPAGE( byData );
} else {
PPUBANK[ 5 ] = VROMPAGE( byData );
}
InfoNES_SetupChr();
break;
case 0x04:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 2 ] = VROMPAGE( byData );
} else {
PPUBANK[ 6 ] = VROMPAGE( byData );
}
InfoNES_SetupChr();
break;
case 0x05:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
if ( Map64_Chr )
{
PPUBANK[ 3 ] = VROMPAGE( byData );
} else {
PPUBANK[ 7 ] = VROMPAGE( byData );
}
InfoNES_SetupChr();
break;
case 0x06:
/* Set ROM Banks */
byData %= ( NesHeader.byRomSize << 1 );
if ( Map64_Prg )
{
ROMBANK1 = ROMPAGE( byData );
} else {
ROMBANK0 = ROMPAGE( byData );
}
break;
case 0x07:
/* Set ROM Banks */
byData %= ( NesHeader.byRomSize << 1 );
if ( Map64_Prg )
{
ROMBANK2 = ROMPAGE( byData );
} else {
ROMBANK1 = ROMPAGE( byData );
}
break;
case 0x08:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 1 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x09:
/* Set PPU Banks */
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 3 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0f:
/* Set ROM Banks */
byData %= ( NesHeader.byRomSize << 1 );
if ( Map64_Prg )
{
ROMBANK0 = ROMPAGE( byData );
} else {
ROMBANK2 = ROMPAGE( byData );
}
break;
}
break;
default:
switch ( wAddr & 0xf000 )
{
case 0xa000:
/* Name Table Mirroring */
InfoNES_Mirroring( byData & 0x01 );
break;
default:
break;
}
break;
}
}
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