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/*===================================================================*/
/* */
/* Mapper 77 (Irem Early Mapper #0) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 77 */
/*-------------------------------------------------------------------*/
void Map77_Init()
{
/* Initialize Mapper */
MapperInit = Map77_Init;
/* Write to Mapper */
MapperWrite = Map77_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 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 2 );
ROMBANK3 = ROMPAGE( 3 );
/* VRAM Write Enabled */
byVramWriteEnable = 1;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 77 Write Function */
/*-------------------------------------------------------------------*/
void Map77_Write( WORD wAddr, BYTE byData )
{
BYTE byRomBank = byData & 0x07;
BYTE byChrBank = ( byData & 0xf0 ) >> 4;
/* Set ROM Banks */
byRomBank <<= 2;
byRomBank %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byRomBank );
ROMBANK1 = ROMPAGE( byRomBank + 1 );
ROMBANK2 = ROMPAGE( byRomBank + 2 );
ROMBANK3 = ROMPAGE( byRomBank + 3 );
/* Set PPU Banks */
byChrBank <<= 1;
byChrBank %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byChrBank );
PPUBANK[ 1 ] = VROMPAGE( byChrBank + 1 );
InfoNES_SetupChr();
}
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