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/*===================================================================*/
/* */
/* Mapper 69 (Sunsoft FME-7) */
/* */
/*===================================================================*/
BYTE Map69_IRQ_Enable;
DWORD Map69_IRQ_Cnt;
BYTE Map69_Regs[ 1 ];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 69 */
/*-------------------------------------------------------------------*/
void Map69_Init()
{
/* Initialize Mapper */
MapperInit = Map69_Init;
/* Write to Mapper */
MapperWrite = Map69_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 = Map69_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 Reg */
Map69_IRQ_Enable = 0;
Map69_IRQ_Cnt = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 69 Write Function */
/*-------------------------------------------------------------------*/
void Map69_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr )
{
case 0x8000:
Map69_Regs[ 0 ] = byData & 0x0f;
break;
case 0xA000:
switch ( Map69_Regs[ 0 ] )
{
/* Set PPU Banks */
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ Map69_Regs[ 0 ] ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
/* Set ROM Banks */
#if 0
case 0x08:
if ( !( byData & 0x40 ) )
{
byData %= ( NesHeader.byRomSize << 1 );
SRAMBANK = ROMPAGE( byData );
}
break;
#endif
case 0x09:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
break;
case 0x0a:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK1 = ROMPAGE( byData );
break;
case 0x0b:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK2 = ROMPAGE( byData );
break;
/* Name Table Mirroring */
case 0x0c:
switch ( byData & 0x03 )
{
case 0:
InfoNES_Mirroring( 1 ); /* Vertical */
break;
case 1:
InfoNES_Mirroring( 0 ); /* Horizontal */
break;
case 2:
InfoNES_Mirroring( 3 ); /* One Screen 0x2400 */
break;
case 3:
InfoNES_Mirroring( 2 ); /* One Screen 0x2000 */
break;
}
break;
case 0x0d:
Map69_IRQ_Enable = byData;
break;
case 0x0e:
Map69_IRQ_Cnt = ( Map69_IRQ_Cnt & 0xff00) | (DWORD)byData;
break;
case 0x0f:
Map69_IRQ_Cnt = ( Map69_IRQ_Cnt & 0x00ff) | ( (DWORD)byData << 8 );
break;
}
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 69 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map69_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map69_IRQ_Enable )
{
if ( Map69_IRQ_Cnt <= 113 )
{
IRQ_REQ;
Map69_IRQ_Cnt = 0;
} else {
Map69_IRQ_Cnt -= 113;
}
}
}
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