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/*===================================================================*/
/* */
/* Mapper 48 (Taito TC0190V) */
/* */
/*===================================================================*/
BYTE Map48_Regs[ 1 ];
BYTE Map48_IRQ_Enable;
BYTE Map48_IRQ_Cnt;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 48 */
/*-------------------------------------------------------------------*/
void Map48_Init()
{
/* Initialize Mapper */
MapperInit = Map48_Init;
/* Write to Mapper */
MapperWrite = Map48_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 = Map48_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 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Initialize IRQ Registers */
Map48_Regs[ 0 ] = 0;
Map48_IRQ_Enable = 0;
Map48_IRQ_Cnt = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 48 Write Function */
/*-------------------------------------------------------------------*/
void Map48_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr )
{
case 0x8000:
/* Name Table Mirroring */
if ( !Map48_Regs[ 0 ] )
{
if ( byData & 0x40 )
{
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
}
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
case 0x8001:
/* Set ROM Banks */
ROMBANK1 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
/* Set PPU Banks */
case 0x8002:
PPUBANK[ 0 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( ( byData << 1 ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x8003:
PPUBANK[ 2 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( ( byData << 1 ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xa000:
PPUBANK[ 4 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xa001:
PPUBANK[ 5 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xa002:
PPUBANK[ 6 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xa003:
PPUBANK[ 7 ] = VROMPAGE( ( ( byData << 1 ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xc000:
Map48_IRQ_Cnt = byData;
break;
case 0xc001:
Map48_IRQ_Enable = byData & 0x01;
break;
case 0xe000:
/* Name Table Mirroring */
if ( byData & 0x40 )
{
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
Map48_Regs[ 0 ] = 1;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 48 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map48_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map48_IRQ_Enable )
{
if ( /* 0 <= PPU_Scanline && */ PPU_Scanline <= 239 )
{
if ( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP )
{
if ( Map48_IRQ_Cnt == 0xff )
{
IRQ_REQ;
Map48_IRQ_Enable = 0;
} else {
Map48_IRQ_Cnt++;
}
}
}
}
}
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